ZnSe ZnS Optics Grinding Machine: Large-Aperture Chalcogenide<\/title>\n<meta name=\"description\" content=\"The G-250 ZnSe ZnS optics grinding machine handles \u00d8 80\u2013250 mm chalcogenide lenses with wheel + coolant tuned to {110} cleavage. 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.play{transform:scale(1.06);background:var(--blue-dark)}\n .video-ph .play svg{width:24px;height:24px;fill:#fff;margin-left:3px}\n .video-ph .t{position:absolute;bottom:14px;left:0;right:0;text-align:center;font-family:var(--mono);font-size:11px;color:var(--blue-deep);font-weight:600;padding:0 12px}\n .rise{opacity:0;transform:translateY(14px);animation:rise .7s cubic-bezier(.2,.7,.2,1) forwards}\n .d1{animation-delay:.04s}.d2{animation-delay:.12s}.d3{animation-delay:.2s}.d4{animation-delay:.28s}.d5{animation-delay:.36s}\n @keyframes rise{to{opacity:1;transform:none}}\n @media(prefers-reduced-motion:reduce){.rise{animation:none;opacity:1;transform:none}}\n .geo *{vector-effect:non-scaling-stroke}\n<\/style>\n<\/head>\n<body>\n\n<section class=\"hero\">\n <div class=\"wrap\">\n <div>\n <div class=\"model-line rise d1\">G-250 \u00b7 Large-Aperture Spherical Grinder<\/div>\n <h1 class=\"rise d2\">ZnSe ZnS Optics Grinding Machine<\/h1>\n <p class=\"lede rise d2\">A large-aperture <strong>ZnSe ZnS optics grinding machine<\/strong> for chalcogenide IR work \u2014 CO\u2082 laser windows, multispectral meniscus lenses, large-aperture thermal-imaging primaries. Wheel grit, coolant pH, and infeed cadence tuned to the <strong>{110} cleavage plane<\/strong> these materials love to chip on.<\/p>\n <div class=\"chips rise d3\">\n <div class=\"chip\"><div class=\"v\">\u00d8 80\u2013250<small> mm<\/small><\/div><div class=\"l\">Workpiece range<\/div><\/div>\n <div class=\"chip\"><div class=\"v\">\u00b10.005<small> mm<\/small><\/div><div class=\"l\">Surface form<\/div><\/div>\n <div class=\"chip\"><div class=\"v\">< 0.2<small> mm<\/small><\/div><div class=\"l\">Edge chipping<\/div><\/div>\n <div class=\"chip\"><div class=\"v\">\u2264 20<small> \u2033<\/small><\/div><div class=\"l\">Centering<\/div><\/div>\n <\/div>\n <div class=\"hero-actions rise d4\">\n <a class=\"btn\" href=\"#quote\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.2\"><path d=\"M5 12h14M13 6l6 6-6 6\"\/><\/svg>Request a sample grind<\/a>\n <a class=\"btn btn-ghost\" href=\"#video\">Watch it grind ZnSe<\/a>\n <\/div>\n <\/div>\n <div class=\"hero-visual rise d3\">\n <div class=\"vhead\"><span>FIG.01 \u2014 {110} CLEAVAGE \u00b7 WHEEL APPROACH<\/span><b>G-250<\/b><\/div>\n <div class=\"vbody\">\n <svg class=\"geo\" viewBox=\"0 0 460 290\" width=\"100%\" role=\"img\" aria-label=\"ZnSe ZnS optics grinding machine \u2014 wheel approach angle relative to {110} cleavage plane: a chipped edge from a wrong approach compared to a clean edge from a calibrated approach\">\n <defs><marker id=\"ar\" markerWidth=\"9\" markerHeight=\"9\" refX=\"6\" refY=\"4.2\" orient=\"auto\"><path d=\"M0 0 L9 4.2 L0 8.4 z\" fill=\"#0274BE\"\/><\/marker><\/defs>\n\n \n <text x=\"115\" y=\"38\" text-anchor=\"middle\" font-family=\"IBM Plex Mono\" font-size=\"11\" fill=\"#A8341E\" font-weight=\"700\">WRONG APPROACH<\/text>\n <text x=\"115\" y=\"54\" text-anchor=\"middle\" font-family=\"IBM Plex Mono\" font-size=\"10\" fill=\"#4E5C72\">wheel \u22a5 {110} cleavage<\/text>\n \n <rect x=\"110\" y=\"68\" width=\"10\" height=\"34\" fill=\"#14202C\"\/>\n <ellipse cx=\"115\" cy=\"116\" rx=\"34\" ry=\"6\" fill=\"#D5E8F6\" stroke=\"#A8341E\" stroke-width=\"1.8\"\/>\n \n <path d=\"M50 170 Q115 144 180 170 L180 210 L50 210 Z\" fill=\"#E1F0FB\" stroke=\"#0274BE\" stroke-width=\"1.7\"\/>\n \n <line x1=\"60\" y1=\"184\" x2=\"170\" y2=\"200\" stroke=\"#A8341E\" stroke-width=\"1\" stroke-dasharray=\"2 3\" opacity=\".5\"\/>\n <line x1=\"60\" y1=\"172\" x2=\"170\" y2=\"188\" stroke=\"#A8341E\" stroke-width=\"1\" stroke-dasharray=\"2 3\" opacity=\".5\"\/>\n \n <path d=\"M50 168 L40 162 L46 174 Z\" fill=\"#A8341E\"\/>\n <path d=\"M180 168 L188 158 L184 172 Z\" fill=\"#A8341E\"\/>\n <text x=\"115\" y=\"240\" text-anchor=\"middle\" font-family=\"IBM Plex Mono\" font-size=\"10\" fill=\"#A8341E\" font-weight=\"600\">chip 0.3\u20130.5 mm<\/text>\n <text x=\"115\" y=\"254\" text-anchor=\"middle\" font-family=\"IBM Plex Mono\" font-size=\"10\" fill=\"#A8341E\">\u2192 rework or scrap<\/text>\n\n \n <line x1=\"230\" y1=\"50\" x2=\"230\" y2=\"262\" stroke=\"#DCE7EF\" stroke-width=\"1\" stroke-dasharray=\"2 4\"\/>\n\n \n <text x=\"345\" y=\"38\" text-anchor=\"middle\" font-family=\"IBM Plex Mono\" font-size=\"11\" fill=\"#015A93\" font-weight=\"700\">CALIBRATED APPROACH<\/text>\n <text x=\"345\" y=\"54\" text-anchor=\"middle\" font-family=\"IBM Plex Mono\" font-size=\"10\" fill=\"#4E5C72\">wheel offset to cleavage<\/text>\n \n <rect x=\"338\" y=\"68\" width=\"10\" height=\"34\" fill=\"#14202C\" transform=\"rotate(12 343 85)\"\/>\n <ellipse cx=\"345\" cy=\"118\" rx=\"34\" ry=\"6\" fill=\"#D5E8F6\" stroke=\"#015A93\" stroke-width=\"1.8\" transform=\"rotate(12 345 118)\"\/>\n \n <path d=\"M280 170 Q345 144 410 170 L410 210 L280 210 Z\" fill=\"#E1F0FB\" stroke=\"#0274BE\" stroke-width=\"1.7\"\/>\n \n <line x1=\"290\" y1=\"184\" x2=\"400\" y2=\"200\" stroke=\"#015A93\" stroke-width=\"1\" stroke-dasharray=\"2 3\" opacity=\".5\"\/>\n <line x1=\"290\" y1=\"172\" x2=\"400\" y2=\"188\" stroke=\"#015A93\" stroke-width=\"1\" stroke-dasharray=\"2 3\" opacity=\".5\"\/>\n \n <text x=\"345\" y=\"240\" text-anchor=\"middle\" font-family=\"IBM Plex Mono\" font-size=\"10\" fill=\"#015A93\" font-weight=\"600\">edge < 0.2 mm<\/text>\n <text x=\"345\" y=\"254\" text-anchor=\"middle\" font-family=\"IBM Plex Mono\" font-size=\"10\" fill=\"#0274BE\">\u2192 inside centering allowance<\/text>\n\n \n <line x1=\"40\" y1=\"272\" x2=\"420\" y2=\"272\" stroke=\"#DCE7EF\" stroke-width=\"1\"\/>\n <text x=\"230\" y=\"285\" text-anchor=\"middle\" font-family=\"IBM Plex Mono\" font-size=\"10.5\" fill=\"#4E5C72\">Mohs 4\u20134.5 chalcogenides need wheel approach calibrated per material<\/text>\n <\/svg>\n <\/div>\n <div class=\"vcap\">ZnSe and ZnS cleave on {110}. A 90\u00b0 wheel approach tears the cleavage plane open at the edge; a calibrated offset keeps the chip inside the centering allowance.<\/div>\n <\/div>\n <\/div>\n<\/section>\n\n\n<section>\n <div class=\"wrap\">\n <div class=\"sec-head\">\n <div class=\"eyebrow\">The Machine<\/div>\n <h2>A large-aperture spherical grinder built for chalcogenide work<\/h2>\n <p>Cast-iron base, NSK-bearing spindle, integrated centroscope \u2014 the same precision frame as the smaller G-100, scaled to \u00d8 80\u2013250 mm and tuned for the softer chalcogenide materials its bigger optics tend to be made of.<\/p>\n <\/div>\n <div class=\"video-wrap\">\n <figure class=\"shot\">\n <img fetchpriority=\"high\" decoding=\"async\" src=\"images\/g250-znse-zns-optics-grinding-machine.jpg\" alt=\"G-250 ZnSe ZnS optics grinding machine \u2014 spindle and large-aperture chuck\" width=\"1100\" height=\"770\" onerror=\"this.style.display='none';this.nextElementSibling.classList.add('show')\" title=\"Vimfun glass cutting equipment is a perfect machine tool for precision cutting\">\n <div class=\"ph\">\n <svg viewBox=\"0 0 460 320\" role=\"img\" aria-label=\"G-250 ZnSe ZnS optics grinding machine \u2014 vertical spindle, large lens chuck, swing-out centroscope, PLC + servo control on cast-iron base\">\n <rect x=\"0\" y=\"0\" width=\"460\" height=\"320\" fill=\"none\"\/>\n <line x1=\"20\" y1=\"296\" x2=\"440\" y2=\"296\" stroke=\"#DCE7EF\" stroke-width=\"1.5\"\/>\n \n <rect x=\"60\" y=\"210\" width=\"350\" height=\"86\" rx=\"8\" fill=\"#015A93\"\/>\n <text x=\"78\" y=\"262\" font-family=\"Sora,sans-serif\" font-weight=\"800\" font-size=\"18\" fill=\"#fff\">G-250<\/text>\n <text x=\"160\" y=\"262\" font-family=\"IBM Plex Mono\" font-size=\"11\" fill=\"#B8DBEF\">LARGE-APERTURE GRINDER<\/text>\n <text x=\"78\" y=\"282\" font-family=\"IBM Plex Mono\" font-size=\"9.5\" fill=\"#B8DBEF\">\u00d8 80\u2013250 mm<\/text>\n \n <rect x=\"300\" y=\"48\" width=\"60\" height=\"178\" rx=\"4\" fill=\"#fff\" stroke=\"#015A93\" stroke-width=\"2\"\/>\n \n <rect x=\"276\" y=\"78\" width=\"58\" height=\"48\" rx=\"4\" fill=\"#14202C\"\/>\n \n <rect x=\"298\" y=\"126\" width=\"14\" height=\"60\" fill=\"#14202C\"\/>\n \n <ellipse cx=\"305\" cy=\"190\" rx=\"30\" ry=\"8\" fill=\"#D5E8F6\" stroke=\"#015A93\" stroke-width=\"1.7\"\/>\n \n <rect x=\"100\" y=\"208\" width=\"170\" height=\"14\" rx=\"2\" fill=\"#14202C\"\/>\n <rect x=\"130\" y=\"192\" width=\"110\" height=\"16\" rx=\"2\" fill=\"#015A93\"\/>\n \n <path d=\"M145 184 Q185 168 225 184 L225 192 L145 192 Z\" fill=\"#E1F0FB\" stroke=\"#0274BE\" stroke-width=\"1.6\"\/>\n \n <rect x=\"218\" y=\"88\" width=\"80\" height=\"10\" rx=\"3\" fill=\"#0274BE\"\/>\n <circle cx=\"218\" cy=\"93\" r=\"8\" fill=\"#fff\" stroke=\"#015A93\" stroke-width=\"1.7\"\/>\n <text x=\"220\" y=\"80\" font-family=\"IBM Plex Mono\" font-size=\"9.5\" fill=\"#4E5C72\">centroscope<\/text>\n \n <rect x=\"370\" y=\"92\" width=\"36\" height=\"62\" rx=\"3\" fill=\"#14202C\"\/>\n <rect x=\"375\" y=\"98\" width=\"26\" height=\"34\" rx=\"2\" fill=\"#0274BE\"\/>\n <line x1=\"375\" y1=\"138\" x2=\"401\" y2=\"138\" stroke=\"#2685C8\" stroke-width=\"2\"\/>\n <line x1=\"375\" y1=\"144\" x2=\"395\" y2=\"144\" stroke=\"#2685C8\" stroke-width=\"2\"\/>\n \n <rect x=\"78\" y=\"240\" width=\"38\" height=\"32\" rx=\"3\" fill=\"#2685C8\" opacity=\".6\"\/>\n <text x=\"78\" y=\"282\" font-family=\"IBM Plex Mono\" font-size=\"8.5\" fill=\"#B8DBEF\">coolant<\/text>\n <\/svg>\n <div style=\"font-family:var(--mono);font-size:10.5px;color:var(--ink-soft);padding:9px 14px;background:var(--white);border-top:1px solid var(--line)\">[ Illustration placeholder \u2014 upload images\/g250-znse-zns-optics-grinding-machine.jpg on deploy ]<\/div>\n <\/div>\n <figcaption>G-250 \u2014 large-aperture spindle, extended centroscope arm, dedicated coolant tank for chalcogenide-compatible emulsion.<\/figcaption>\n <\/figure>\n <div>\n <p>The G-250 ZnSe ZnS optics grinding machine is a scaled-up sibling of the smaller G-100, sharing the same NSK precision bearings, \u00b13 \u00b5m spindle vibration, and PLC + servo control philosophy. What differs is the frame mass and the wheel-spindle geometry, sized for the larger workpieces \u2014 \u00d8 80\u2013250 mm \u2014 that show up in CO\u2082 laser optics, large multispectral primaries, and defense-grade thermal-imaging objectives. The coolant tank ships sized for water-soluble emulsion calibrated to ZnSe-safe pH.<\/p>\n <ul class=\"build-list\">\n <li><b>Workpiece range<\/b> \u00d8 80\u2013250 mm \u00b7 thickness \u2264 45 mm<\/li>\n <li><b>Positioning accuracy<\/b> \u00b10.003 mm<\/li>\n <li><b>Spindle runout<\/b> radial & axial within 0.005 mm<\/li>\n <li><b>Spindle vibration<\/b> \u2264 \u00b13 \u00b5m displacement \u2014 critical on Mohs 4\u20134.5 materials<\/li>\n <li><b>Bearings<\/b> NSK 7203C \/ 7005AC P4 mechanical \u00b7 natural air cooling<\/li>\n <li><b>Control<\/b> PLC + servo \u00b7 English HMI \u00b7 handheld controller<\/li>\n <li><b>Coolant<\/b> water-soluble emulsion \u00b7 pH near 7 (chalcogenide-safe)<\/li>\n <\/ul>\n <a class=\"btn btn-ghost\" href=\"#quote\">Request the full spec sheet<\/a>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\n\n\n<section class=\"band\">\n <div class=\"wrap\">\n <div class=\"sec-head\">\n <div class=\"eyebrow\">Key Features<\/div>\n <h2>What the ZnSe ZnS optics grinding machine does differently<\/h2>\n <p>The G-250 frame and spindle are the same precision family as the smaller models. The differences that matter for ZnSe and ZnS work live in the wheel, the coolant, and the infeed cadence \u2014 and in the workpiece range that fits a CO\u2082 laser window.<\/p>\n <\/div>\n <div class=\"feat-grid\">\n <div class=\"feat\"><div class=\"num\">1<\/div><h3>\u00d8 80\u2013250 mm large-aperture range<\/h3><p>Built for the optics ZnSe and ZnS actually get used in \u2014 CO\u2082 laser windows and meniscus lenses, large multispectral primaries, defense-grade thermal-imaging objectives. Small-aperture chalcogenide work belongs on the <a href=\"https:\/\/www.opticalcutting.com\/infrared-optics-grinding-machine\/\">G-100<\/a>.<\/p><\/div>\n <div class=\"feat\"><div class=\"num\">2<\/div><h3>Wheel grit calibrated for chalcogenides<\/h3><p>350\u2013400 grit electroplated nickel-bond on a #45 steel base \u2014 same wheel system as the smaller G-series, but with a lighter dressing routine. ZnSe is Mohs 4\u20134.5; a wheel that's worked fine on germanium will pluck a chip off ZnSe if it's running too hot.<\/p><\/div>\n <div class=\"feat\"><div class=\"num\">3<\/div><h3>Coolant pH near 7<\/h3><p>ZnSe is sensitive to alkaline coolant \u2014 pH above 9 visibly clouds the surface and ruins the subsurface for polishing. The G-250 ships with a near-neutral water-soluble emulsion and a pH meter for verification at each fill.<\/p><\/div>\n <div class=\"feat\"><div class=\"num\">4<\/div><h3>\u2264 \u00b13 \u00b5m spindle vibration<\/h3><p>The number that bounds edge chipping on soft chalcogenides. NSK precision bearings, a heavy cast-iron base, and natural air cooling keep the spindle inside \u00b13 \u00b5m displacement \u2014 enough to hold edge chip under 0.2 mm on ZnSe.<\/p><\/div>\n <div class=\"feat\"><div class=\"num\">5<\/div><h3>\u2264 20\u2033 centering on large aperture<\/h3><p>An extended centroscope arm reaches \u00d8 250 mm workpieces and reads optical-axis runout the same way it does on a 60 mm thermal-imaging lens \u2014 to within 20 arc-seconds. Form on the finished part is bounded by centering, not by spindle drift.<\/p><\/div>\n <div class=\"feat\"><div class=\"num\">6<\/div><h3>Wheel-approach offset programmable<\/h3><p>The wrong wheel approach angle on a {110}-cleaving material tears the cleavage plane at the edge. The G-250's PLC lets you offset the approach per material \u2014 we ship it pre-set for ZnSe and ZnS, with profiles editable through the HMI.<\/p><\/div>\n <\/div>\n <\/div>\n<\/section>\n\n\n<section id=\"video\">\n <div class=\"wrap\">\n <div class=\"sec-head\">\n <div class=\"eyebrow\">Videos<\/div>\n <h2>See the G-250 grind a CO\u2082 laser window<\/h2>\n <p>Two short clips covering what a ZnSe ZnS optics grinding machine actually looks like in operation \u2014 the chalcogenide-safe coolant approach and the wheel-offset routine that keeps edge chipping inside the centering allowance.<\/p>\n <\/div>\n <div class=\"vid-2\">\n <div class=\"vid-item\">\n <a class=\"video-ph\" href=\"https:\/\/www.youtube.com\/@endlessdiamondwireloop\" target=\"_blank\" rel=\"noopener noreferrer\" aria-label=\"G-250 ZnSe wheel approach setup video\">\n <span class=\"play\"><svg viewBox=\"0 0 24 24\"><path d=\"M8 5v14l11-7z\"\/><\/svg><\/span>\n <span class=\"t\">Wheel approach setup \u2014 calibrating offset for {110} cleavage (paste embed ID on deploy)<\/span>\n <\/a>\n <p class=\"cap\">\u25b8 Setup \u2014 wheel approach calibration for ZnSe<\/p>\n <\/div>\n <div class=\"vid-item\">\n <a class=\"video-ph\" href=\"https:\/\/www.youtube.com\/@endlessdiamondwireloop\" target=\"_blank\" rel=\"noopener noreferrer\" aria-label=\"G-250 ZnSe grinding cycle video\">\n <span class=\"play\"><svg viewBox=\"0 0 24 24\"><path d=\"M8 5v14l11-7z\"\/><\/svg><\/span>\n <span class=\"t\">Grinding cycle \u2014 \u00d8 150 mm ZnSe CO\u2082 laser window (paste embed ID on deploy)<\/span>\n <\/a>\n <p class=\"cap\">\u25b8 Cycle \u2014 \u00d8 150 mm ZnSe meniscus grind<\/p>\n <\/div>\n <\/div>\n <p style=\"color:var(--ink-soft);font-size:15px;margin-top:18px\">Want to see your specific lens drawing run? When you <a href=\"#quote\">request a sample grind<\/a>, we record the run on your blank and send it with the metrology report.<\/p>\n <\/div>\n<\/section>\n\n\n<section class=\"band\">\n <div class=\"wrap twocol\">\n <div class=\"lab\"><div class=\"eyebrow\">The Cost Driver<\/div><h2>Why edge chipping is the line item on ZnSe and ZnS work<\/h2><\/div>\n <div>\n <p>Germanium grinding worries about subsurface damage and form. A ZnSe ZnS optics grinding machine has a different priority list: edge chipping first, everything else second. The reason is mechanical: both materials are Mohs 4\u20134.5 (softer than germanium at 6\u20136.5), and both cleave readily on the {110} plane. A wheel approach that produces a clean edge on Ge \u2014 same wheel, same coolant \u2014 will pluck a 0.3\u20130.5 mm chip off a ZnSe edge if the approach angle isn't offset to the cleavage.<\/p>\n <p>At ZnSe spot price of $400\u2013$600\/kg and ZnS standard at $80\u2013$150\/kg, the material itself is a quarter of what germanium runs. But the cost stack on a chipped lens is bigger than the material line. A \u00d8 150 mm ZnSe CO\u2082 laser window blank carries ~$200 of raw material plus the cost of the cutting, centering, and any prior grinding passes that got it to the G-250. A chip that exceeds the 0.2 mm centering allowance either gets re-fixtured for a second grinding pass (eating polishing margin) or scrapped. <span class=\"hl\">A 5% chip rate across a 100-part run is $1,000+ of scrap plus rework time the schedule never accounted for.<\/span><\/p>\n <p>The G-250 ZnSe ZnS optics grinding machine controls that loss at the wheel \u2014 calibrated approach angle per material, near-neutral pH coolant, slower infeed than the same machine running germanium. The numbers we hold are < 0.2 mm edge chip and \u00b10.005 mm form. The full chalcogenide material properties are in <a href=\"https:\/\/www.crystran.co.uk\/optical-materials\/zinc-selenide-znse\" target=\"_blank\" rel=\"noopener noreferrer\">Crystran's ZnSe datasheet<\/a> and <a href=\"https:\/\/www.crystran.co.uk\/optical-materials\/zinc-sulphide-multispectral-zns-ms\" target=\"_blank\" rel=\"noopener noreferrer\">Crystran's multispectral ZnS datasheet<\/a>.<\/p>\n <\/div>\n <\/div>\n<\/section>\n\n\n<section>\n <div class=\"wrap twocol\">\n <div class=\"lab\"><div class=\"eyebrow\">How it grinds<\/div><h2>Wheel, coolant, and approach \u2014 calibrated for chalcogenides<\/h2><\/div>\n <div>\n <h3>Wheel grit and bond selection<\/h3>\n <p>Standard wheel for the G-250 ZnSe ZnS optics grinding machine is a 350\u2013400 grit electroplated nickel-bond cup on a #45 steel base \u2014 same family as we recommend for germanium, but with a different dressing cadence. ZnSe loads the wheel faster than Ge does because the swarf is softer; we re-dress every 30\u201340 parts on a \u00d8 100 mm ZnSe lens, against ~80\u2013100 parts on equivalent germanium work. For multispectral ZnS, dress between every part group \u2014 the CVD grain structure varies enough that a \"settled\" wheel reads as a \"new\" wheel on the next batch.<\/p>\n <h3>Coolant pH and concentration<\/h3>\n <p>ZnSe is the material the coolant has to be right for. Plain water leaves a chalky surface visible to the naked eye; alkaline coolant (pH > 9) clouds the subsurface in a way the polisher can't recover. We ship the G-250 with a water-soluble emulsion calibrated to pH 6.8\u20137.4 at 5\u20138% concentration. The supplied pH meter sits next to the coolant tank, and the operator checks at every fill. ZnS is more forgiving on pH but reacts the same way to wrong concentration \u2014 too dilute and the wheel runs hot, too concentrated and the cleanup pass leaves residue.<\/p>\n <div class=\"note warn\"><div class=\"t\">\u26a0 Chemistry gotcha \u2014 coolant pH<\/div><p>If your shop is on a shared coolant loop with a CNC mill or a glass grinder, that coolant is almost certainly too alkaline for ZnSe (mill coolants run pH 9\u201310 for rust prevention). Either dedicate a coolant circuit to the G-250 or accept that you'll be re-polishing every ZnSe lens to recover surface clarity. We don't share coolant loops \u2014 and we mention it on day one because customers have walked into this exact problem more than once.<\/p><\/div>\n <\/div>\n <\/div>\n<\/section>\n\n\n<section class=\"band\">\n <div class=\"wrap twocol\">\n <div class=\"lab\"><div class=\"eyebrow\">Comparison<\/div><h2>How does bonded-grit grinding compare to traditional ZnSe lapping?<\/h2><\/div>\n <div>\n <p>Optical shops still hand-lap ZnSe lenses with loose abrasive on a cast-iron plate \u2014 the traditional approach for soft brittle materials. It works, and a skilled operator can produce a clean edge. The trade is throughput, repeatability, and operator dependency. Bonded-grit grinding on a G-250 ZnSe ZnS optics grinding machine hits the same edge-chipping floor with form repeatability you can verify on a test plate, not on the operator's last good day.<\/p>\n <table class=\"tbl\">\n <thead><tr><th>Approach<\/th><th>Form tolerance<\/th><th>Edge chip<\/th><th>Cycle \/ face<\/th><th>Operator skill<\/th><\/tr><\/thead>\n <tbody>\n <tr><td>Hand lapping (cast iron + slurry)<\/td><td>varies by operator<\/td><td>< 0.1 mm if good<\/td><td>hours<\/td><td>high<\/td><\/tr>\n <tr><td>Full CNC freeform grinder<\/td><td>\u00b10.005 mm<\/td><td>< 0.2 mm<\/td><td>2\u20133 min<\/td><td>CNC programmer<\/td><\/tr>\n <tr><td class=\"hl\">G-250 bonded-grit (this page)<\/td><td class=\"hl\">\u00b10.005 mm<\/td><td class=\"hl\">< 0.2 mm<\/td><td class=\"hl\">1\u20132 min<\/td><td class=\"hl\">PLC + handheld<\/td><\/tr>\n <\/tbody>\n <\/table>\n <p>The honest tradeoff: hand lapping wins on edge-chip floor when an experienced operator runs it (the slurry's not a solid cutting tool \u2014 there's nothing to gouge). The G-250 wins on throughput, repeatability, and not depending on one operator's career. If you only grind ZnSe in batches of three a quarter, hand-lap. If you grind ZnSe weekly at production volume, you want a bonded-grit machine sized to the aperture you're running. For finished-lens tolerance frameworks see <a href=\"https:\/\/www.iso.org\/standard\/79655.html\" target=\"_blank\" rel=\"noopener noreferrer\">ISO 10110<\/a>.<\/p>\n <div class=\"note\"><div class=\"t\">What this machine isn't<\/div><p>The G-250 is a spherical generator, not a freeform grinder. For aspheres with significant sag departure from best-fit sphere, a full CNC freeform machine fits the job better. We'll tell you on the drawing review which one applies; sending us your finished-lens drawing is the fastest way to find out.<\/p><\/div>\n <\/div>\n <\/div>\n<\/section>\n\n\n<section>\n <div class=\"wrap\">\n <div class=\"sec-head\">\n <div class=\"eyebrow\">Engineering Highlights<\/div>\n <h2>Built for chalcogenide IR work at large aperture<\/h2>\n <p>What the G-250 ZnSe ZnS optics grinding machine commits to on a CO\u2082 laser window or a large multispectral primary \u2014 the numbers that bound edge chipping, form, and the handoff to polishing.<\/p>\n <\/div>\n <div class=\"hl-grid\">\n <div class=\"hl-card\"><div class=\"ic\"><svg viewBox=\"0 0 24 24\"><circle cx=\"12\" cy=\"12\" r=\"8\"\/><circle cx=\"12\" cy=\"12\" r=\"3\"\/><\/svg><\/div><div><div class=\"v\">\u00d8 80\u2013250 mm<\/div><div class=\"d\">CO\u2082 laser windows, large multispectral primaries, defense optics.<\/div><\/div><\/div>\n <div class=\"hl-card\"><div class=\"ic\"><svg viewBox=\"0 0 24 24\"><path d=\"M4 18 L9 13 l3 3 8-10\"\/><\/svg><\/div><div><div class=\"v\">\u00b10.005 mm form<\/div><div class=\"d\">Surface form held inside 5 \u00b5m \u2014 verifiable on a test plate.<\/div><\/div><\/div>\n <div class=\"hl-card\"><div class=\"ic\"><svg viewBox=\"0 0 24 24\"><path d=\"M3 17 L9 8 l4 5 8-12\"\/><\/svg><\/div><div><div class=\"v\">< 0.2 mm chip<\/div><div class=\"d\">On ZnSe and ZnS \u2014 wheel approach calibrated to {110} cleavage.<\/div><\/div><\/div>\n <div class=\"hl-card\"><div class=\"ic\"><svg viewBox=\"0 0 24 24\"><path d=\"M4 12c0-4 3-7 8-7s8 3 8 7-3 7-8 7M4 12h4M16 12h4\"\/><\/svg><\/div><div><div class=\"v\">pH 6.8\u20137.4 coolant<\/div><div class=\"d\">Near-neutral emulsion \u2014 ships with a pH meter at the tank.<\/div><\/div><\/div>\n <div class=\"hl-card\"><div class=\"ic\"><svg viewBox=\"0 0 24 24\"><path d=\"M5 12l5 5 9-11\"\/><\/svg><\/div><div><div class=\"v\">Free trial grind<\/div><div class=\"d\">Send your ZnSe blank + drawing; we ship back a proof + report.<\/div><\/div><\/div>\n <div class=\"hl-card\"><div class=\"ic\"><svg viewBox=\"0 0 24 24\"><path d=\"M12 3l8 4v6c0 4-3 7-8 8-5-1-8-4-8-8V7z\"\/><\/svg><\/div><div><div class=\"v\">Materials support<\/div><div class=\"d\">Wheel grit + coolant recommendations on your specific material grade.<\/div><\/div><\/div>\n <\/div>\n <\/div>\n<\/section>\n\n\n<section class=\"band\">\n <div class=\"wrap twocol\">\n <div class=\"lab\"><div class=\"eyebrow\">Datasheet<\/div><h2>G-250 technical specifications<\/h2><\/div>\n <div>\n <p>Standard-configuration specs for the G-250 ZnSe ZnS optics grinding machine. The base precision numbers come from the G-series platform; the workpiece range, wheel sizing, and shipped coolant set this one apart for chalcogenide work.<\/p>\n <table class=\"tbl datasheet\"><tbody>\n <tr><td>Workpiece diameter<\/td><td>\u00d8 80 \u2013 250 mm<\/td><\/tr>\n <tr><td>Workpiece thickness<\/td><td>\u2264 45 mm<\/td><\/tr>\n <tr><td>Surface types<\/td><td>convex \u00b7 concave \u00b7 flat (same spindle)<\/td><\/tr>\n <tr><td>Axis positioning accuracy<\/td><td>\u00b10.003 mm<\/td><\/tr>\n <tr><td>Spindle radial \/ axial runout<\/td><td>within 0.005 mm<\/td><\/tr>\n <tr><td>Spindle vibration (displacement)<\/td><td>\u2264 \u00b13 \u00b5m<\/td><\/tr>\n <tr><td>Surface form after grinding<\/td><td>within 0.005 mm<\/td><\/tr>\n <tr><td>Centering tolerance (centroscope)<\/td><td>\u2264 20\u2033 arc-seconds<\/td><\/tr>\n <tr><td>Diameter tolerance<\/td><td>\u00b10.01 mm<\/td><\/tr>\n <tr><td>Roundness<\/td><td>\u2264 0.01 mm<\/td><\/tr>\n <tr><td>Edge chipping (ZnSe \/ ZnS)<\/td><td>< 0.2 mm<\/td><\/tr>\n <tr><td>Shipped wheel<\/td><td>350\u2013400 grit electroplated nickel-bond on #45 steel base<\/td><\/tr>\n <tr><td>Re-dress cadence (ZnSe \u00d8 100 mm)<\/td><td>every 30\u201340 parts<\/td><\/tr>\n <tr><td>Coolant<\/td><td>water-soluble emulsion \u00b7 pH 6.8\u20137.4 \u00b7 5\u20138% concentration<\/td><\/tr>\n <tr><td>pH verification<\/td><td>pH meter included at coolant tank<\/td><\/tr>\n <tr><td>Bearings<\/td><td>NSK 7203C \/ 7005AC P4 \u2014 mechanical, natural air-cooled<\/td><\/tr>\n <tr><td>Linear guides<\/td><td>4-direction equal-load preload precision rail<\/td><\/tr>\n <tr><td>Ball screws<\/td><td>single-nut un-flanged rolled C7 preload<\/td><\/tr>\n <tr><td>Control<\/td><td>PLC + servo \u00b7 English HMI \u00b7 handheld controller<\/td><\/tr>\n <tr><td>Wheel-approach offset<\/td><td>programmable per material profile via HMI<\/td><\/tr>\n <tr><td>Drawing standard<\/td><td>ISO 10110<\/td><\/tr>\n <tr><td>Service life (well-maintained, dedicated coolant loop)<\/td><td>20\u201330 years<\/td><\/tr>\n <\/tbody><\/table>\n <p>Tolerances on the ground part flow to centering and polishing per <a href=\"https:\/\/www.iso.org\/standard\/79655.html\" target=\"_blank\" rel=\"noopener noreferrer\">ISO 10110<\/a>. The chalcogenide-specific bits \u2014 coolant pH, wheel re-dress cadence \u2014 are what differentiate this G-250 datasheet from a generic spherical grinder spec sheet.<\/p>\n <figure class=\"photo\">\n <img decoding=\"async\" src=\"images\/g250-znse-zns-optics-grinding-machine-spindle.jpg\" alt=\"G-250 ZnSe ZnS optics grinding machine \u2014 large-aperture chuck and centroscope arm\" width=\"1200\" height=\"600\" onerror=\"this.style.display='none';this.parentNode.querySelector('figcaption').textContent='[ Product photo placeholder \u2014 upload images\/g250-znse-zns-optics-grinding-machine-spindle.jpg on deploy; alt text already set. ]';\" title=\"Vimfun glass cutting equipment is a perfect machine tool for precision cutting\">\n <figcaption>G-250 spindle and extended centroscope \u2014 sized for \u00d8 250 mm CO\u2082 laser windows and multispectral primaries.<\/figcaption>\n <\/figure>\n <\/div>\n <\/div>\n<\/section>\n\n\n<section>\n <div class=\"wrap twocol\">\n <div class=\"lab\"><div class=\"eyebrow\">Materials<\/div><h2>ZnSe and ZnS \u2014 the two materials this page exists for<\/h2><\/div>\n <div>\n <p>The G-250 ZnSe ZnS optics grinding machine will grind Ge, Si, sapphire, and optical glass too \u2014 same machine family as the G-100. But this page is specifically about chalcogenides, because that's where the wheel choice, coolant chemistry, and approach-angle calibration matter most. Here's the practical material data the shop floor actually needs:<\/p>\n <ul class=\"clean\">\n <li><strong>Zinc selenide (ZnSe)<\/strong> \u2014 Mohs 4\u20134.5, cleaves on {110}. Spot price $400\u2013$600\/kg. CO\u2082 laser windows (10.6 \u00b5m), MWIR \/ LWIR thermal-imaging meniscus lenses, broadband 0.6\u201318 \u00b5m transmission. Sensitive to alkaline coolant; needs pH 6.8\u20137.4 and 5\u20138% emulsion concentration.<\/li>\n <li><strong>Zinc sulfide (ZnS) \u2014 standard \/ FLIR grade<\/strong> \u2014 Mohs ~3, polycrystalline CVD. Spot price $80\u2013$150\/kg. MWIR \/ LWIR thermal-imaging optics in lower-cost assemblies. More forgiving than ZnSe on coolant pH but reacts the same way to wrong concentration.<\/li>\n <li><strong>Zinc sulfide (ZnS) \u2014 multispectral<\/strong> \u2014 Mohs ~4, hot-isostatically-pressed CVD with extended transmission to visible. Spot price $200\u2013$400\/kg. Defense and surveillance multispectral imaging. Dress the wheel between part groups \u2014 the grain structure varies enough across batches that a settled wheel reads as new on the next batch.<\/li>\n <\/ul>\n <p>For Ge, Si, sapphire, BK7 work in the same \u00d8 80\u2013250 mm range, the G-250 will run them \u2014 wheel choice and infeed change. For \u00d8 10\u2013100 mm small-aperture work in any of these materials including ZnSe and ZnS, go to the <a href=\"https:\/\/www.opticalcutting.com\/infrared-optics-grinding-machine\/\">G-100 page<\/a>.<\/p>\n <\/div>\n <\/div>\n<\/section>\n\n\n<section class=\"band\">\n <div class=\"wrap twocol\">\n <div class=\"lab\"><div class=\"eyebrow\">Production line<\/div><h2>Where does the G-250 fit in a chalcogenide IR line?<\/h2><\/div>\n <div>\n <p>The G-250 ZnSe ZnS optics grinding machine sits between the cutting station and the polisher, same as the smaller sibling, but the upstream and downstream specifics shift with the material. ZnSe blanks usually come in CVD-grown form (rectangular slabs or large-aperture pre-pressed discs) rather than the cast ingots used for Ge. Centering is done on this machine before grinding starts; the ground surface then handsoff to a polisher tuned for chalcogenide slurry.<\/p>\n <p>For the broader IR-optics manufacturing workflow \u2014 slicing, centering, grinding, polishing, AR coating \u2014 the <a href=\"https:\/\/www.opticalcutting.com\/germanium-lens-manufacturing\/\">germanium lens manufacturing<\/a> page lays out the same five-stage process the chalcogenide line follows, with material substitutions. The full equipment range is at the <a href=\"https:\/\/www.opticalcutting.com\/\">infrared optics manufacturing equipment<\/a> hub.<\/p>\n <div class=\"note\"><div class=\"t\">When to pick a different machine<\/div><p>For small-aperture chalcogenide work (\u00d8 10\u2013100 mm) \u2014 typical of handheld thermal-imaging modules, sensor optics, and small CO\u2082 laser optics \u2014 the <a href=\"https:\/\/www.opticalcutting.com\/infrared-optics-grinding-machine\/\">G-100 infrared optics grinding machine<\/a> is the right frame, not the G-250. Same coolant-pH and wheel-approach logic applies; just sized for the smaller aperture. For non-chalcogenide work in this \u00d8 80\u2013250 mm range (large germanium primary lenses, large sapphire windows), the G-250 still applies \u2014 drop the chalcogenide-specific coolant and adjust wheel grit.<\/p><\/div>\n <\/div>\n <\/div>\n<\/section>\n\n\n<section class=\"cta\" id=\"quote\">\n <div class=\"wrap cta-inner\">\n <div>\n <div class=\"eyebrow\">Next step<\/div>\n <h2>Get a sample grind on your own ZnSe blank<\/h2>\n <p>Pick the G-250 ZnSe ZnS optics grinding machine if you're running CO\u2082 laser windows, multispectral primaries, or large-aperture thermal-imaging objectives in production, and you want a spherical generator that ships with coolant chemistry and wheel-approach logic already calibrated for chalcogenides. Send us your finished-lens drawing and a ZnSe or ZnS blank; we'll grind a proof part and return it with a metrology report before you commit.<\/p>\n <\/div>\n <div>\n <a class=\"btn\" href=\"mailto:daria@endlesswiresaw.com?subject=G-250%20ZnSe%20ZnS%20optics%20grinding%20machine%20\u2014%20sample%20grind%20request\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.2\"><path d=\"M5 12h14M13 6l6 6-6 6\"\/><\/svg>Request a sample grind & quote<\/a>\n <p class=\"trust\"><b>Vimfun<\/b> \u00b7 ISO 9001 \u00b7 CE compliant \u00b7 shipped to 20+ countries<br>\n Optics customers include Edmund Optics and Coherent.<br>\n Tel +1 (408) 571-8651 \u00b7 <a href=\"mailto:daria@endlesswiresaw.com\">daria@endlesswiresaw.com<\/a><\/p>\n <\/div>\n <\/div>\n<\/section>\n\n\n<\/body>\n<\/html>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p> G-250 \u00b7 Large-Aperture Spherical Grinder ZnSe ZnS Optics Grinding Machine A large-aperture ZnSe ZnS optics grinding machine for chalcogenide IR work \u2014 CO\u2082 laser windows, multispectral meniscus lenses, large-aperture thermal-imaging primaries. Wheel grit, coolant pH, and infeed cadence tuned to the {110} cleavage plane these materials love to chip on. \u00d8 80\u2013250\u00a0mmWorkpiece range […]<\/p>\n","protected":false},"featured_media":4873,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"site-sidebar-layout":"no-sidebar","site-content-layout":"page-builder","ast-site-content-layout":"full-width-container","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}}},"product_brand":[],"product_cat":[242,838],"product_tag":[],"class_list":{"0":"post-4876","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-products","7":"product_cat-grinding-machine","8":"desktop-align-left","9":"tablet-align-left","10":"mobile-align-left","11":"ast-product-gallery-layout-horizontal-slider","12":"ast-product-gallery-with-no-image","14":"first","15":"instock","16":"shipping-taxable","17":"product-type-simple"},"acf":[],"_links":{"self":[{"href":"https:\/\/www.opticalcutting.com\/fr\/wp-json\/wp\/v2\/product\/4876","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.opticalcutting.com\/fr\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.opticalcutting.com\/fr\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.opticalcutting.com\/fr\/wp-json\/wp\/v2\/comments?post=4876"}],"version-history":[{"count":0,"href":"https:\/\/www.opticalcutting.com\/fr\/wp-json\/wp\/v2\/product\/4876\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.opticalcutting.com\/fr\/wp-json\/wp\/v2\/media\/4873"}],"wp:attachment":[{"href":"https:\/\/www.opticalcutting.com\/fr\/wp-json\/wp\/v2\/media?parent=4876"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.opticalcutting.com\/fr\/wp-json\/wp\/v2\/product_brand?post=4876"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.opticalcutting.com\/fr\/wp-json\/wp\/v2\/product_cat?post=4876"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.opticalcutting.com\/fr\/wp-json\/wp\/v2\/product_tag?post=4876"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}

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.play{transform:scale(1.06);background:var(--blue-dark)}\n .video-ph .play svg{width:24px;height:24px;fill:#fff;margin-left:3px}\n .video-ph .t{position:absolute;bottom:14px;left:0;right:0;text-align:center;font-family:var(--mono);font-size:11px;color:var(--blue-deep);font-weight:600;padding:0 12px}\n .rise{opacity:0;transform:translateY(14px);animation:rise .7s cubic-bezier(.2,.7,.2,1) forwards}\n .d1{animation-delay:.04s}.d2{animation-delay:.12s}.d3{animation-delay:.2s}.d4{animation-delay:.28s}.d5{animation-delay:.36s}\n @keyframes rise{to{opacity:1;transform:none}}\n @media(prefers-reduced-motion:reduce){.rise{animation:none;opacity:1;transform:none}}\n .geo *{vector-effect:non-scaling-stroke}\n<\/style>\n<\/head>\n<body>\n\n<section class=\"hero\">\n <div class=\"wrap\">\n <div>\n <div class=\"model-line rise d1\">G-250 \u00b7 Large-Aperture Spherical Grinder<\/div>\n <h1 class=\"rise d2\">ZnSe ZnS Optics Grinding Machine<\/h1>\n <p class=\"lede rise d2\">A large-aperture <strong>ZnSe ZnS optics grinding machine<\/strong> for chalcogenide IR work \u2014 CO\u2082 laser windows, multispectral meniscus lenses, large-aperture thermal-imaging primaries. Wheel grit, coolant pH, and infeed cadence tuned to the <strong>{110} cleavage plane<\/strong> these materials love to chip on.<\/p>\n <div class=\"chips rise d3\">\n <div class=\"chip\"><div class=\"v\">\u00d8 80\u2013250<small> mm<\/small><\/div><div class=\"l\">Workpiece range<\/div><\/div>\n <div class=\"chip\"><div class=\"v\">\u00b10.005<small> mm<\/small><\/div><div class=\"l\">Surface form<\/div><\/div>\n <div class=\"chip\"><div class=\"v\">< 0.2<small> mm<\/small><\/div><div class=\"l\">Edge chipping<\/div><\/div>\n <div class=\"chip\"><div class=\"v\">\u2264 20<small> \u2033<\/small><\/div><div class=\"l\">Centering<\/div><\/div>\n <\/div>\n <div class=\"hero-actions rise d4\">\n <a class=\"btn\" href=\"#quote\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.2\"><path d=\"M5 12h14M13 6l6 6-6 6\"\/><\/svg>Request a sample grind<\/a>\n <a class=\"btn btn-ghost\" href=\"#video\">Watch it grind ZnSe<\/a>\n <\/div>\n <\/div>\n <div class=\"hero-visual rise d3\">\n <div class=\"vhead\"><span>FIG.01 \u2014 {110} CLEAVAGE \u00b7 WHEEL APPROACH<\/span><b>G-250<\/b><\/div>\n <div class=\"vbody\">\n <svg class=\"geo\" viewBox=\"0 0 460 290\" width=\"100%\" role=\"img\" aria-label=\"ZnSe ZnS optics grinding machine \u2014 wheel approach angle relative to {110} cleavage plane: a chipped edge from a wrong approach compared to a clean edge from a calibrated approach\">\n <defs><marker id=\"ar\" markerWidth=\"9\" markerHeight=\"9\" refX=\"6\" refY=\"4.2\" orient=\"auto\"><path d=\"M0 0 L9 4.2 L0 8.4 z\" fill=\"#0274BE\"\/><\/marker><\/defs>\n\n \n <text x=\"115\" y=\"38\" text-anchor=\"middle\" font-family=\"IBM Plex Mono\" font-size=\"11\" fill=\"#A8341E\" font-weight=\"700\">WRONG APPROACH<\/text>\n <text x=\"115\" y=\"54\" text-anchor=\"middle\" font-family=\"IBM Plex Mono\" font-size=\"10\" fill=\"#4E5C72\">wheel \u22a5 {110} cleavage<\/text>\n \n <rect x=\"110\" y=\"68\" width=\"10\" height=\"34\" fill=\"#14202C\"\/>\n <ellipse cx=\"115\" cy=\"116\" rx=\"34\" ry=\"6\" fill=\"#D5E8F6\" stroke=\"#A8341E\" stroke-width=\"1.8\"\/>\n \n <path d=\"M50 170 Q115 144 180 170 L180 210 L50 210 Z\" fill=\"#E1F0FB\" stroke=\"#0274BE\" stroke-width=\"1.7\"\/>\n \n <line x1=\"60\" y1=\"184\" x2=\"170\" y2=\"200\" stroke=\"#A8341E\" stroke-width=\"1\" stroke-dasharray=\"2 3\" opacity=\".5\"\/>\n <line x1=\"60\" y1=\"172\" x2=\"170\" y2=\"188\" stroke=\"#A8341E\" stroke-width=\"1\" stroke-dasharray=\"2 3\" opacity=\".5\"\/>\n \n <path d=\"M50 168 L40 162 L46 174 Z\" fill=\"#A8341E\"\/>\n <path d=\"M180 168 L188 158 L184 172 Z\" fill=\"#A8341E\"\/>\n <text x=\"115\" y=\"240\" text-anchor=\"middle\" font-family=\"IBM Plex Mono\" font-size=\"10\" fill=\"#A8341E\" font-weight=\"600\">chip 0.3\u20130.5 mm<\/text>\n <text x=\"115\" y=\"254\" text-anchor=\"middle\" font-family=\"IBM Plex Mono\" font-size=\"10\" fill=\"#A8341E\">\u2192 rework or scrap<\/text>\n\n \n <line x1=\"230\" y1=\"50\" x2=\"230\" y2=\"262\" stroke=\"#DCE7EF\" stroke-width=\"1\" stroke-dasharray=\"2 4\"\/>\n\n \n <text x=\"345\" y=\"38\" text-anchor=\"middle\" font-family=\"IBM Plex Mono\" font-size=\"11\" fill=\"#015A93\" font-weight=\"700\">CALIBRATED APPROACH<\/text>\n <text x=\"345\" y=\"54\" text-anchor=\"middle\" font-family=\"IBM Plex Mono\" font-size=\"10\" fill=\"#4E5C72\">wheel offset to cleavage<\/text>\n \n <rect x=\"338\" y=\"68\" width=\"10\" height=\"34\" fill=\"#14202C\" transform=\"rotate(12 343 85)\"\/>\n <ellipse cx=\"345\" cy=\"118\" rx=\"34\" ry=\"6\" fill=\"#D5E8F6\" stroke=\"#015A93\" stroke-width=\"1.8\" transform=\"rotate(12 345 118)\"\/>\n \n <path d=\"M280 170 Q345 144 410 170 L410 210 L280 210 Z\" fill=\"#E1F0FB\" stroke=\"#0274BE\" stroke-width=\"1.7\"\/>\n \n <line x1=\"290\" y1=\"184\" x2=\"400\" y2=\"200\" stroke=\"#015A93\" stroke-width=\"1\" stroke-dasharray=\"2 3\" opacity=\".5\"\/>\n <line x1=\"290\" y1=\"172\" x2=\"400\" y2=\"188\" stroke=\"#015A93\" stroke-width=\"1\" stroke-dasharray=\"2 3\" opacity=\".5\"\/>\n \n <text x=\"345\" y=\"240\" text-anchor=\"middle\" font-family=\"IBM Plex Mono\" font-size=\"10\" fill=\"#015A93\" font-weight=\"600\">edge < 0.2 mm<\/text>\n <text x=\"345\" y=\"254\" text-anchor=\"middle\" font-family=\"IBM Plex Mono\" font-size=\"10\" fill=\"#0274BE\">\u2192 inside centering allowance<\/text>\n\n \n <line x1=\"40\" y1=\"272\" x2=\"420\" y2=\"272\" stroke=\"#DCE7EF\" stroke-width=\"1\"\/>\n <text x=\"230\" y=\"285\" text-anchor=\"middle\" font-family=\"IBM Plex Mono\" font-size=\"10.5\" fill=\"#4E5C72\">Mohs 4\u20134.5 chalcogenides need wheel approach calibrated per material<\/text>\n <\/svg>\n <\/div>\n <div class=\"vcap\">ZnSe and ZnS cleave on {110}. A 90\u00b0 wheel approach tears the cleavage plane open at the edge; a calibrated offset keeps the chip inside the centering allowance.<\/div>\n <\/div>\n <\/div>\n<\/section>\n\n\n<section>\n <div class=\"wrap\">\n <div class=\"sec-head\">\n <div class=\"eyebrow\">The Machine<\/div>\n <h2>A large-aperture spherical grinder built for chalcogenide work<\/h2>\n <p>Cast-iron base, NSK-bearing spindle, integrated centroscope \u2014 the same precision frame as the smaller G-100, scaled to \u00d8 80\u2013250 mm and tuned for the softer chalcogenide materials its bigger optics tend to be made of.<\/p>\n <\/div>\n <div class=\"video-wrap\">\n <figure class=\"shot\">\n <img fetchpriority=\"high\" decoding=\"async\" src=\"images\/g250-znse-zns-optics-grinding-machine.jpg\" alt=\"G-250 ZnSe ZnS optics grinding machine \u2014 spindle and large-aperture chuck\" width=\"1100\" height=\"770\" onerror=\"this.style.display='none';this.nextElementSibling.classList.add('show')\" title=\"Vimfun glass cutting equipment is a perfect machine tool for precision cutting\">\n <div class=\"ph\">\n <svg viewBox=\"0 0 460 320\" role=\"img\" aria-label=\"G-250 ZnSe ZnS optics grinding machine \u2014 vertical spindle, large lens chuck, swing-out centroscope, PLC + servo control on cast-iron base\">\n <rect x=\"0\" y=\"0\" width=\"460\" height=\"320\" fill=\"none\"\/>\n <line x1=\"20\" y1=\"296\" x2=\"440\" y2=\"296\" stroke=\"#DCE7EF\" stroke-width=\"1.5\"\/>\n \n <rect x=\"60\" y=\"210\" width=\"350\" height=\"86\" rx=\"8\" fill=\"#015A93\"\/>\n <text x=\"78\" y=\"262\" font-family=\"Sora,sans-serif\" font-weight=\"800\" font-size=\"18\" fill=\"#fff\">G-250<\/text>\n <text x=\"160\" y=\"262\" font-family=\"IBM Plex Mono\" font-size=\"11\" fill=\"#B8DBEF\">LARGE-APERTURE GRINDER<\/text>\n <text x=\"78\" y=\"282\" font-family=\"IBM Plex Mono\" font-size=\"9.5\" fill=\"#B8DBEF\">\u00d8 80\u2013250 mm<\/text>\n \n <rect x=\"300\" y=\"48\" width=\"60\" height=\"178\" rx=\"4\" fill=\"#fff\" stroke=\"#015A93\" stroke-width=\"2\"\/>\n \n <rect x=\"276\" y=\"78\" width=\"58\" height=\"48\" rx=\"4\" fill=\"#14202C\"\/>\n \n <rect x=\"298\" y=\"126\" width=\"14\" height=\"60\" fill=\"#14202C\"\/>\n \n <ellipse cx=\"305\" cy=\"190\" rx=\"30\" ry=\"8\" fill=\"#D5E8F6\" stroke=\"#015A93\" stroke-width=\"1.7\"\/>\n \n <rect x=\"100\" y=\"208\" width=\"170\" height=\"14\" rx=\"2\" fill=\"#14202C\"\/>\n <rect x=\"130\" y=\"192\" width=\"110\" height=\"16\" rx=\"2\" fill=\"#015A93\"\/>\n \n <path d=\"M145 184 Q185 168 225 184 L225 192 L145 192 Z\" fill=\"#E1F0FB\" stroke=\"#0274BE\" stroke-width=\"1.6\"\/>\n \n <rect x=\"218\" y=\"88\" width=\"80\" height=\"10\" rx=\"3\" fill=\"#0274BE\"\/>\n <circle cx=\"218\" cy=\"93\" r=\"8\" fill=\"#fff\" stroke=\"#015A93\" stroke-width=\"1.7\"\/>\n <text x=\"220\" y=\"80\" font-family=\"IBM Plex Mono\" font-size=\"9.5\" fill=\"#4E5C72\">centroscope<\/text>\n \n <rect x=\"370\" y=\"92\" width=\"36\" height=\"62\" rx=\"3\" fill=\"#14202C\"\/>\n <rect x=\"375\" y=\"98\" width=\"26\" height=\"34\" rx=\"2\" fill=\"#0274BE\"\/>\n <line x1=\"375\" y1=\"138\" x2=\"401\" y2=\"138\" stroke=\"#2685C8\" stroke-width=\"2\"\/>\n <line x1=\"375\" y1=\"144\" x2=\"395\" y2=\"144\" stroke=\"#2685C8\" stroke-width=\"2\"\/>\n \n <rect x=\"78\" y=\"240\" width=\"38\" height=\"32\" rx=\"3\" fill=\"#2685C8\" opacity=\".6\"\/>\n <text x=\"78\" y=\"282\" font-family=\"IBM Plex Mono\" font-size=\"8.5\" fill=\"#B8DBEF\">coolant<\/text>\n <\/svg>\n <div style=\"font-family:var(--mono);font-size:10.5px;color:var(--ink-soft);padding:9px 14px;background:var(--white);border-top:1px solid var(--line)\">[ Illustration placeholder \u2014 upload images\/g250-znse-zns-optics-grinding-machine.jpg on deploy ]<\/div>\n <\/div>\n <figcaption>G-250 \u2014 large-aperture spindle, extended centroscope arm, dedicated coolant tank for chalcogenide-compatible emulsion.<\/figcaption>\n <\/figure>\n <div>\n <p>The G-250 ZnSe ZnS optics grinding machine is a scaled-up sibling of the smaller G-100, sharing the same NSK precision bearings, \u00b13 \u00b5m spindle vibration, and PLC + servo control philosophy. What differs is the frame mass and the wheel-spindle geometry, sized for the larger workpieces \u2014 \u00d8 80\u2013250 mm \u2014 that show up in CO\u2082 laser optics, large multispectral primaries, and defense-grade thermal-imaging objectives. The coolant tank ships sized for water-soluble emulsion calibrated to ZnSe-safe pH.<\/p>\n <ul class=\"build-list\">\n <li><b>Workpiece range<\/b> \u00d8 80\u2013250 mm \u00b7 thickness \u2264 45 mm<\/li>\n <li><b>Positioning accuracy<\/b> \u00b10.003 mm<\/li>\n <li><b>Spindle runout<\/b> radial & axial within 0.005 mm<\/li>\n <li><b>Spindle vibration<\/b> \u2264 \u00b13 \u00b5m displacement \u2014 critical on Mohs 4\u20134.5 materials<\/li>\n <li><b>Bearings<\/b> NSK 7203C \/ 7005AC P4 mechanical \u00b7 natural air cooling<\/li>\n <li><b>Control<\/b> PLC + servo \u00b7 English HMI \u00b7 handheld controller<\/li>\n <li><b>Coolant<\/b> water-soluble emulsion \u00b7 pH near 7 (chalcogenide-safe)<\/li>\n <\/ul>\n <a class=\"btn btn-ghost\" href=\"#quote\">Request the full spec sheet<\/a>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\n\n\n<section class=\"band\">\n <div class=\"wrap\">\n <div class=\"sec-head\">\n <div class=\"eyebrow\">Key Features<\/div>\n <h2>What the ZnSe ZnS optics grinding machine does differently<\/h2>\n <p>The G-250 frame and spindle are the same precision family as the smaller models. The differences that matter for ZnSe and ZnS work live in the wheel, the coolant, and the infeed cadence \u2014 and in the workpiece range that fits a CO\u2082 laser window.<\/p>\n <\/div>\n <div class=\"feat-grid\">\n <div class=\"feat\"><div class=\"num\">1<\/div><h3>\u00d8 80\u2013250 mm large-aperture range<\/h3><p>Built for the optics ZnSe and ZnS actually get used in \u2014 CO\u2082 laser windows and meniscus lenses, large multispectral primaries, defense-grade thermal-imaging objectives. Small-aperture chalcogenide work belongs on the <a href=\"https:\/\/www.opticalcutting.com\/infrared-optics-grinding-machine\/\">G-100<\/a>.<\/p><\/div>\n <div class=\"feat\"><div class=\"num\">2<\/div><h3>Wheel grit calibrated for chalcogenides<\/h3><p>350\u2013400 grit electroplated nickel-bond on a #45 steel base \u2014 same wheel system as the smaller G-series, but with a lighter dressing routine. ZnSe is Mohs 4\u20134.5; a wheel that's worked fine on germanium will pluck a chip off ZnSe if it's running too hot.<\/p><\/div>\n <div class=\"feat\"><div class=\"num\">3<\/div><h3>Coolant pH near 7<\/h3><p>ZnSe is sensitive to alkaline coolant \u2014 pH above 9 visibly clouds the surface and ruins the subsurface for polishing. The G-250 ships with a near-neutral water-soluble emulsion and a pH meter for verification at each fill.<\/p><\/div>\n <div class=\"feat\"><div class=\"num\">4<\/div><h3>\u2264 \u00b13 \u00b5m spindle vibration<\/h3><p>The number that bounds edge chipping on soft chalcogenides. NSK precision bearings, a heavy cast-iron base, and natural air cooling keep the spindle inside \u00b13 \u00b5m displacement \u2014 enough to hold edge chip under 0.2 mm on ZnSe.<\/p><\/div>\n <div class=\"feat\"><div class=\"num\">5<\/div><h3>\u2264 20\u2033 centering on large aperture<\/h3><p>An extended centroscope arm reaches \u00d8 250 mm workpieces and reads optical-axis runout the same way it does on a 60 mm thermal-imaging lens \u2014 to within 20 arc-seconds. Form on the finished part is bounded by centering, not by spindle drift.<\/p><\/div>\n <div class=\"feat\"><div class=\"num\">6<\/div><h3>Wheel-approach offset programmable<\/h3><p>The wrong wheel approach angle on a {110}-cleaving material tears the cleavage plane at the edge. The G-250's PLC lets you offset the approach per material \u2014 we ship it pre-set for ZnSe and ZnS, with profiles editable through the HMI.<\/p><\/div>\n <\/div>\n <\/div>\n<\/section>\n\n\n<section id=\"video\">\n <div class=\"wrap\">\n <div class=\"sec-head\">\n <div class=\"eyebrow\">Videos<\/div>\n <h2>See the G-250 grind a CO\u2082 laser window<\/h2>\n <p>Two short clips covering what a ZnSe ZnS optics grinding machine actually looks like in operation \u2014 the chalcogenide-safe coolant approach and the wheel-offset routine that keeps edge chipping inside the centering allowance.<\/p>\n <\/div>\n <div class=\"vid-2\">\n <div class=\"vid-item\">\n <a class=\"video-ph\" href=\"https:\/\/www.youtube.com\/@endlessdiamondwireloop\" target=\"_blank\" rel=\"noopener noreferrer\" aria-label=\"G-250 ZnSe wheel approach setup video\">\n <span class=\"play\"><svg viewBox=\"0 0 24 24\"><path d=\"M8 5v14l11-7z\"\/><\/svg><\/span>\n <span class=\"t\">Wheel approach setup \u2014 calibrating offset for {110} cleavage (paste embed ID on deploy)<\/span>\n <\/a>\n <p class=\"cap\">\u25b8 Setup \u2014 wheel approach calibration for ZnSe<\/p>\n <\/div>\n <div class=\"vid-item\">\n <a class=\"video-ph\" href=\"https:\/\/www.youtube.com\/@endlessdiamondwireloop\" target=\"_blank\" rel=\"noopener noreferrer\" aria-label=\"G-250 ZnSe grinding cycle video\">\n <span class=\"play\"><svg viewBox=\"0 0 24 24\"><path d=\"M8 5v14l11-7z\"\/><\/svg><\/span>\n <span class=\"t\">Grinding cycle \u2014 \u00d8 150 mm ZnSe CO\u2082 laser window (paste embed ID on deploy)<\/span>\n <\/a>\n <p class=\"cap\">\u25b8 Cycle \u2014 \u00d8 150 mm ZnSe meniscus grind<\/p>\n <\/div>\n <\/div>\n <p style=\"color:var(--ink-soft);font-size:15px;margin-top:18px\">Want to see your specific lens drawing run? When you <a href=\"#quote\">request a sample grind<\/a>, we record the run on your blank and send it with the metrology report.<\/p>\n <\/div>\n<\/section>\n\n\n<section class=\"band\">\n <div class=\"wrap twocol\">\n <div class=\"lab\"><div class=\"eyebrow\">The Cost Driver<\/div><h2>Why edge chipping is the line item on ZnSe and ZnS work<\/h2><\/div>\n <div>\n <p>Germanium grinding worries about subsurface damage and form. A ZnSe ZnS optics grinding machine has a different priority list: edge chipping first, everything else second. The reason is mechanical: both materials are Mohs 4\u20134.5 (softer than germanium at 6\u20136.5), and both cleave readily on the {110} plane. A wheel approach that produces a clean edge on Ge \u2014 same wheel, same coolant \u2014 will pluck a 0.3\u20130.5 mm chip off a ZnSe edge if the approach angle isn't offset to the cleavage.<\/p>\n <p>At ZnSe spot price of $400\u2013$600\/kg and ZnS standard at $80\u2013$150\/kg, the material itself is a quarter of what germanium runs. But the cost stack on a chipped lens is bigger than the material line. A \u00d8 150 mm ZnSe CO\u2082 laser window blank carries ~$200 of raw material plus the cost of the cutting, centering, and any prior grinding passes that got it to the G-250. A chip that exceeds the 0.2 mm centering allowance either gets re-fixtured for a second grinding pass (eating polishing margin) or scrapped. <span class=\"hl\">A 5% chip rate across a 100-part run is $1,000+ of scrap plus rework time the schedule never accounted for.<\/span><\/p>\n <p>The G-250 ZnSe ZnS optics grinding machine controls that loss at the wheel \u2014 calibrated approach angle per material, near-neutral pH coolant, slower infeed than the same machine running germanium. The numbers we hold are < 0.2 mm edge chip and \u00b10.005 mm form. The full chalcogenide material properties are in <a href=\"https:\/\/www.crystran.co.uk\/optical-materials\/zinc-selenide-znse\" target=\"_blank\" rel=\"noopener noreferrer\">Crystran's ZnSe datasheet<\/a> and <a href=\"https:\/\/www.crystran.co.uk\/optical-materials\/zinc-sulphide-multispectral-zns-ms\" target=\"_blank\" rel=\"noopener noreferrer\">Crystran's multispectral ZnS datasheet<\/a>.<\/p>\n <\/div>\n <\/div>\n<\/section>\n\n\n<section>\n <div class=\"wrap twocol\">\n <div class=\"lab\"><div class=\"eyebrow\">How it grinds<\/div><h2>Wheel, coolant, and approach \u2014 calibrated for chalcogenides<\/h2><\/div>\n <div>\n <h3>Wheel grit and bond selection<\/h3>\n <p>Standard wheel for the G-250 ZnSe ZnS optics grinding machine is a 350\u2013400 grit electroplated nickel-bond cup on a #45 steel base \u2014 same family as we recommend for germanium, but with a different dressing cadence. ZnSe loads the wheel faster than Ge does because the swarf is softer; we re-dress every 30\u201340 parts on a \u00d8 100 mm ZnSe lens, against ~80\u2013100 parts on equivalent germanium work. For multispectral ZnS, dress between every part group \u2014 the CVD grain structure varies enough that a \"settled\" wheel reads as a \"new\" wheel on the next batch.<\/p>\n <h3>Coolant pH and concentration<\/h3>\n <p>ZnSe is the material the coolant has to be right for. Plain water leaves a chalky surface visible to the naked eye; alkaline coolant (pH > 9) clouds the subsurface in a way the polisher can't recover. We ship the G-250 with a water-soluble emulsion calibrated to pH 6.8\u20137.4 at 5\u20138% concentration. The supplied pH meter sits next to the coolant tank, and the operator checks at every fill. ZnS is more forgiving on pH but reacts the same way to wrong concentration \u2014 too dilute and the wheel runs hot, too concentrated and the cleanup pass leaves residue.<\/p>\n <div class=\"note warn\"><div class=\"t\">\u26a0 Chemistry gotcha \u2014 coolant pH<\/div><p>If your shop is on a shared coolant loop with a CNC mill or a glass grinder, that coolant is almost certainly too alkaline for ZnSe (mill coolants run pH 9\u201310 for rust prevention). Either dedicate a coolant circuit to the G-250 or accept that you'll be re-polishing every ZnSe lens to recover surface clarity. We don't share coolant loops \u2014 and we mention it on day one because customers have walked into this exact problem more than once.<\/p><\/div>\n <\/div>\n <\/div>\n<\/section>\n\n\n<section class=\"band\">\n <div class=\"wrap twocol\">\n <div class=\"lab\"><div class=\"eyebrow\">Comparison<\/div><h2>How does bonded-grit grinding compare to traditional ZnSe lapping?<\/h2><\/div>\n <div>\n <p>Optical shops still hand-lap ZnSe lenses with loose abrasive on a cast-iron plate \u2014 the traditional approach for soft brittle materials. It works, and a skilled operator can produce a clean edge. The trade is throughput, repeatability, and operator dependency. Bonded-grit grinding on a G-250 ZnSe ZnS optics grinding machine hits the same edge-chipping floor with form repeatability you can verify on a test plate, not on the operator's last good day.<\/p>\n <table class=\"tbl\">\n <thead><tr><th>Approach<\/th><th>Form tolerance<\/th><th>Edge chip<\/th><th>Cycle \/ face<\/th><th>Operator skill<\/th><\/tr><\/thead>\n <tbody>\n <tr><td>Hand lapping (cast iron + slurry)<\/td><td>varies by operator<\/td><td>< 0.1 mm if good<\/td><td>hours<\/td><td>high<\/td><\/tr>\n <tr><td>Full CNC freeform grinder<\/td><td>\u00b10.005 mm<\/td><td>< 0.2 mm<\/td><td>2\u20133 min<\/td><td>CNC programmer<\/td><\/tr>\n <tr><td class=\"hl\">G-250 bonded-grit (this page)<\/td><td class=\"hl\">\u00b10.005 mm<\/td><td class=\"hl\">< 0.2 mm<\/td><td class=\"hl\">1\u20132 min<\/td><td class=\"hl\">PLC + handheld<\/td><\/tr>\n <\/tbody>\n <\/table>\n <p>The honest tradeoff: hand lapping wins on edge-chip floor when an experienced operator runs it (the slurry's not a solid cutting tool \u2014 there's nothing to gouge). The G-250 wins on throughput, repeatability, and not depending on one operator's career. If you only grind ZnSe in batches of three a quarter, hand-lap. If you grind ZnSe weekly at production volume, you want a bonded-grit machine sized to the aperture you're running. For finished-lens tolerance frameworks see <a href=\"https:\/\/www.iso.org\/standard\/79655.html\" target=\"_blank\" rel=\"noopener noreferrer\">ISO 10110<\/a>.<\/p>\n <div class=\"note\"><div class=\"t\">What this machine isn't<\/div><p>The G-250 is a spherical generator, not a freeform grinder. For aspheres with significant sag departure from best-fit sphere, a full CNC freeform machine fits the job better. We'll tell you on the drawing review which one applies; sending us your finished-lens drawing is the fastest way to find out.<\/p><\/div>\n <\/div>\n <\/div>\n<\/section>\n\n\n<section>\n <div class=\"wrap\">\n <div class=\"sec-head\">\n <div class=\"eyebrow\">Engineering Highlights<\/div>\n <h2>Built for chalcogenide IR work at large aperture<\/h2>\n <p>What the G-250 ZnSe ZnS optics grinding machine commits to on a CO\u2082 laser window or a large multispectral primary \u2014 the numbers that bound edge chipping, form, and the handoff to polishing.<\/p>\n <\/div>\n <div class=\"hl-grid\">\n <div class=\"hl-card\"><div class=\"ic\"><svg viewBox=\"0 0 24 24\"><circle cx=\"12\" cy=\"12\" r=\"8\"\/><circle cx=\"12\" cy=\"12\" r=\"3\"\/><\/svg><\/div><div><div class=\"v\">\u00d8 80\u2013250 mm<\/div><div class=\"d\">CO\u2082 laser windows, large multispectral primaries, defense optics.<\/div><\/div><\/div>\n <div class=\"hl-card\"><div class=\"ic\"><svg viewBox=\"0 0 24 24\"><path d=\"M4 18 L9 13 l3 3 8-10\"\/><\/svg><\/div><div><div class=\"v\">\u00b10.005 mm form<\/div><div class=\"d\">Surface form held inside 5 \u00b5m \u2014 verifiable on a test plate.<\/div><\/div><\/div>\n <div class=\"hl-card\"><div class=\"ic\"><svg viewBox=\"0 0 24 24\"><path d=\"M3 17 L9 8 l4 5 8-12\"\/><\/svg><\/div><div><div class=\"v\">< 0.2 mm chip<\/div><div class=\"d\">On ZnSe and ZnS \u2014 wheel approach calibrated to {110} cleavage.<\/div><\/div><\/div>\n <div class=\"hl-card\"><div class=\"ic\"><svg viewBox=\"0 0 24 24\"><path d=\"M4 12c0-4 3-7 8-7s8 3 8 7-3 7-8 7M4 12h4M16 12h4\"\/><\/svg><\/div><div><div class=\"v\">pH 6.8\u20137.4 coolant<\/div><div class=\"d\">Near-neutral emulsion \u2014 ships with a pH meter at the tank.<\/div><\/div><\/div>\n <div class=\"hl-card\"><div class=\"ic\"><svg viewBox=\"0 0 24 24\"><path d=\"M5 12l5 5 9-11\"\/><\/svg><\/div><div><div class=\"v\">Free trial grind<\/div><div class=\"d\">Send your ZnSe blank + drawing; we ship back a proof + report.<\/div><\/div><\/div>\n <div class=\"hl-card\"><div class=\"ic\"><svg viewBox=\"0 0 24 24\"><path d=\"M12 3l8 4v6c0 4-3 7-8 8-5-1-8-4-8-8V7z\"\/><\/svg><\/div><div><div class=\"v\">Materials support<\/div><div class=\"d\">Wheel grit + coolant recommendations on your specific material grade.<\/div><\/div><\/div>\n <\/div>\n <\/div>\n<\/section>\n\n\n<section class=\"band\">\n <div class=\"wrap twocol\">\n <div class=\"lab\"><div class=\"eyebrow\">Datasheet<\/div><h2>G-250 technical specifications<\/h2><\/div>\n <div>\n <p>Standard-configuration specs for the G-250 ZnSe ZnS optics grinding machine. The base precision numbers come from the G-series platform; the workpiece range, wheel sizing, and shipped coolant set this one apart for chalcogenide work.<\/p>\n <table class=\"tbl datasheet\"><tbody>\n <tr><td>Workpiece diameter<\/td><td>\u00d8 80 \u2013 250 mm<\/td><\/tr>\n <tr><td>Workpiece thickness<\/td><td>\u2264 45 mm<\/td><\/tr>\n <tr><td>Surface types<\/td><td>convex \u00b7 concave \u00b7 flat (same spindle)<\/td><\/tr>\n <tr><td>Axis positioning accuracy<\/td><td>\u00b10.003 mm<\/td><\/tr>\n <tr><td>Spindle radial \/ axial runout<\/td><td>within 0.005 mm<\/td><\/tr>\n <tr><td>Spindle vibration (displacement)<\/td><td>\u2264 \u00b13 \u00b5m<\/td><\/tr>\n <tr><td>Surface form after grinding<\/td><td>within 0.005 mm<\/td><\/tr>\n <tr><td>Centering tolerance (centroscope)<\/td><td>\u2264 20\u2033 arc-seconds<\/td><\/tr>\n <tr><td>Diameter tolerance<\/td><td>\u00b10.01 mm<\/td><\/tr>\n <tr><td>Roundness<\/td><td>\u2264 0.01 mm<\/td><\/tr>\n <tr><td>Edge chipping (ZnSe \/ ZnS)<\/td><td>< 0.2 mm<\/td><\/tr>\n <tr><td>Shipped wheel<\/td><td>350\u2013400 grit electroplated nickel-bond on #45 steel base<\/td><\/tr>\n <tr><td>Re-dress cadence (ZnSe \u00d8 100 mm)<\/td><td>every 30\u201340 parts<\/td><\/tr>\n <tr><td>Coolant<\/td><td>water-soluble emulsion \u00b7 pH 6.8\u20137.4 \u00b7 5\u20138% concentration<\/td><\/tr>\n <tr><td>pH verification<\/td><td>pH meter included at coolant tank<\/td><\/tr>\n <tr><td>Bearings<\/td><td>NSK 7203C \/ 7005AC P4 \u2014 mechanical, natural air-cooled<\/td><\/tr>\n <tr><td>Linear guides<\/td><td>4-direction equal-load preload precision rail<\/td><\/tr>\n <tr><td>Ball screws<\/td><td>single-nut un-flanged rolled C7 preload<\/td><\/tr>\n <tr><td>Control<\/td><td>PLC + servo \u00b7 English HMI \u00b7 handheld controller<\/td><\/tr>\n <tr><td>Wheel-approach offset<\/td><td>programmable per material profile via HMI<\/td><\/tr>\n <tr><td>Drawing standard<\/td><td>ISO 10110<\/td><\/tr>\n <tr><td>Service life (well-maintained, dedicated coolant loop)<\/td><td>20\u201330 years<\/td><\/tr>\n <\/tbody><\/table>\n <p>Tolerances on the ground part flow to centering and polishing per <a href=\"https:\/\/www.iso.org\/standard\/79655.html\" target=\"_blank\" rel=\"noopener noreferrer\">ISO 10110<\/a>. The chalcogenide-specific bits \u2014 coolant pH, wheel re-dress cadence \u2014 are what differentiate this G-250 datasheet from a generic spherical grinder spec sheet.<\/p>\n <figure class=\"photo\">\n <img decoding=\"async\" src=\"images\/g250-znse-zns-optics-grinding-machine-spindle.jpg\" alt=\"G-250 ZnSe ZnS optics grinding machine \u2014 large-aperture chuck and centroscope arm\" width=\"1200\" height=\"600\" onerror=\"this.style.display='none';this.parentNode.querySelector('figcaption').textContent='[ Product photo placeholder \u2014 upload images\/g250-znse-zns-optics-grinding-machine-spindle.jpg on deploy; alt text already set. ]';\" title=\"Vimfun glass cutting equipment is a perfect machine tool for precision cutting\">\n <figcaption>G-250 spindle and extended centroscope \u2014 sized for \u00d8 250 mm CO\u2082 laser windows and multispectral primaries.<\/figcaption>\n <\/figure>\n <\/div>\n <\/div>\n<\/section>\n\n\n<section>\n <div class=\"wrap twocol\">\n <div class=\"lab\"><div class=\"eyebrow\">Materials<\/div><h2>ZnSe and ZnS \u2014 the two materials this page exists for<\/h2><\/div>\n <div>\n <p>The G-250 ZnSe ZnS optics grinding machine will grind Ge, Si, sapphire, and optical glass too \u2014 same machine family as the G-100. But this page is specifically about chalcogenides, because that's where the wheel choice, coolant chemistry, and approach-angle calibration matter most. Here's the practical material data the shop floor actually needs:<\/p>\n <ul class=\"clean\">\n <li><strong>Zinc selenide (ZnSe)<\/strong> \u2014 Mohs 4\u20134.5, cleaves on {110}. Spot price $400\u2013$600\/kg. CO\u2082 laser windows (10.6 \u00b5m), MWIR \/ LWIR thermal-imaging meniscus lenses, broadband 0.6\u201318 \u00b5m transmission. Sensitive to alkaline coolant; needs pH 6.8\u20137.4 and 5\u20138% emulsion concentration.<\/li>\n <li><strong>Zinc sulfide (ZnS) \u2014 standard \/ FLIR grade<\/strong> \u2014 Mohs ~3, polycrystalline CVD. Spot price $80\u2013$150\/kg. MWIR \/ LWIR thermal-imaging optics in lower-cost assemblies. More forgiving than ZnSe on coolant pH but reacts the same way to wrong concentration.<\/li>\n <li><strong>Zinc sulfide (ZnS) \u2014 multispectral<\/strong> \u2014 Mohs ~4, hot-isostatically-pressed CVD with extended transmission to visible. Spot price $200\u2013$400\/kg. Defense and surveillance multispectral imaging. Dress the wheel between part groups \u2014 the grain structure varies enough across batches that a settled wheel reads as new on the next batch.<\/li>\n <\/ul>\n <p>For Ge, Si, sapphire, BK7 work in the same \u00d8 80\u2013250 mm range, the G-250 will run them \u2014 wheel choice and infeed change. For \u00d8 10\u2013100 mm small-aperture work in any of these materials including ZnSe and ZnS, go to the <a href=\"https:\/\/www.opticalcutting.com\/infrared-optics-grinding-machine\/\">G-100 page<\/a>.<\/p>\n <\/div>\n <\/div>\n<\/section>\n\n\n<section class=\"band\">\n <div class=\"wrap twocol\">\n <div class=\"lab\"><div class=\"eyebrow\">Production line<\/div><h2>Where does the G-250 fit in a chalcogenide IR line?<\/h2><\/div>\n <div>\n <p>The G-250 ZnSe ZnS optics grinding machine sits between the cutting station and the polisher, same as the smaller sibling, but the upstream and downstream specifics shift with the material. ZnSe blanks usually come in CVD-grown form (rectangular slabs or large-aperture pre-pressed discs) rather than the cast ingots used for Ge. Centering is done on this machine before grinding starts; the ground surface then handsoff to a polisher tuned for chalcogenide slurry.<\/p>\n <p>For the broader IR-optics manufacturing workflow \u2014 slicing, centering, grinding, polishing, AR coating \u2014 the <a href=\"https:\/\/www.opticalcutting.com\/germanium-lens-manufacturing\/\">germanium lens manufacturing<\/a> page lays out the same five-stage process the chalcogenide line follows, with material substitutions. The full equipment range is at the <a href=\"https:\/\/www.opticalcutting.com\/\">infrared optics manufacturing equipment<\/a> hub.<\/p>\n <div class=\"note\"><div class=\"t\">When to pick a different machine<\/div><p>For small-aperture chalcogenide work (\u00d8 10\u2013100 mm) \u2014 typical of handheld thermal-imaging modules, sensor optics, and small CO\u2082 laser optics \u2014 the <a href=\"https:\/\/www.opticalcutting.com\/infrared-optics-grinding-machine\/\">G-100 infrared optics grinding machine<\/a> is the right frame, not the G-250. Same coolant-pH and wheel-approach logic applies; just sized for the smaller aperture. For non-chalcogenide work in this \u00d8 80\u2013250 mm range (large germanium primary lenses, large sapphire windows), the G-250 still applies \u2014 drop the chalcogenide-specific coolant and adjust wheel grit.<\/p><\/div>\n <\/div>\n <\/div>\n<\/section>\n\n\n<section class=\"cta\" id=\"quote\">\n <div class=\"wrap cta-inner\">\n <div>\n <div class=\"eyebrow\">Next step<\/div>\n <h2>Get a sample grind on your own ZnSe blank<\/h2>\n <p>Pick the G-250 ZnSe ZnS optics grinding machine if you're running CO\u2082 laser windows, multispectral primaries, or large-aperture thermal-imaging objectives in production, and you want a spherical generator that ships with coolant chemistry and wheel-approach logic already calibrated for chalcogenides. Send us your finished-lens drawing and a ZnSe or ZnS blank; we'll grind a proof part and return it with a metrology report before you commit.<\/p>\n <\/div>\n <div>\n <a class=\"btn\" href=\"mailto:daria@endlesswiresaw.com?subject=G-250%20ZnSe%20ZnS%20optics%20grinding%20machine%20\u2014%20sample%20grind%20request\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.2\"><path d=\"M5 12h14M13 6l6 6-6 6\"\/><\/svg>Request a sample grind & quote<\/a>\n <p class=\"trust\"><b>Vimfun<\/b> \u00b7 ISO 9001 \u00b7 CE compliant \u00b7 shipped to 20+ countries<br>\n Optics customers include Edmund Optics and Coherent.<br>\n Tel +1 (408) 571-8651 \u00b7 <a href=\"mailto:daria@endlesswiresaw.com\">daria@endlesswiresaw.com<\/a><\/p>\n <\/div>\n <\/div>\n<\/section>\n\n\n<\/body>\n<\/html>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p> G-250 \u00b7 Large-Aperture Spherical Grinder ZnSe ZnS Optics Grinding Machine A large-aperture ZnSe ZnS optics grinding machine for chalcogenide IR work \u2014 CO\u2082 laser windows, multispectral meniscus lenses, large-aperture thermal-imaging primaries. Wheel grit, coolant pH, and infeed cadence tuned to the {110} cleavage plane these materials love to chip on. \u00d8 80\u2013250\u00a0mmWorkpiece range […]<\/p>\n","protected":false},"featured_media":4873,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"site-sidebar-layout":"no-sidebar","site-content-layout":"page-builder","ast-site-content-layout":"full-width-container","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}}},"product_brand":[],"product_cat":[242,838],"product_tag":[],"class_list":{"0":"post-4876","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-products","7":"product_cat-grinding-machine","8":"desktop-align-left","9":"tablet-align-left","10":"mobile-align-left","11":"ast-product-gallery-layout-horizontal-slider","12":"ast-product-gallery-with-no-image","14":"first","15":"instock","16":"shipping-taxable","17":"product-type-simple"},"acf":[],"_links":{"self":[{"href":"https:\/\/www.opticalcutting.com\/fr\/wp-json\/wp\/v2\/product\/4876","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.opticalcutting.com\/fr\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.opticalcutting.com\/fr\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.opticalcutting.com\/fr\/wp-json\/wp\/v2\/comments?post=4876"}],"version-history":[{"count":0,"href":"https:\/\/www.opticalcutting.com\/fr\/wp-json\/wp\/v2\/product\/4876\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.opticalcutting.com\/fr\/wp-json\/wp\/v2\/media\/4873"}],"wp:attachment":[{"href":"https:\/\/www.opticalcutting.com\/fr\/wp-json\/wp\/v2\/media?parent=4876"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.opticalcutting.com\/fr\/wp-json\/wp\/v2\/product_brand?post=4876"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.opticalcutting.com\/fr\/wp-json\/wp\/v2\/product_cat?post=4876"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.opticalcutting.com\/fr\/wp-json\/wp\/v2\/product_tag?post=4876"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}