Germanium Ingot Cutting Wire Saw: SGI 40 with CAD Contour Cut<\/title>\n<meta name=\"description\" content=\"The SGI 40 germanium ingot cutting wire saw cuts \u00d8 185 \u00d7 400 mm Ge ingots and runs DXF contour cuts on the same machine. 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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 \/* customer-case text: override the global p max-width so paragraphs fill the column *\/\n .case-text p, .case-text ul, .case-text .note{max-width:none}\n<\/style>\n<\/head>\n<body>\n\n<section class=\"hero\">\n <div class=\"wrap\">\n <div>\n <div class=\"model-line rise d1\">SGI 40 \u00b7 CAD Contour + Slicing Wire Saw<\/div>\n <h1 class=\"rise d2\">Germanium Ingot Cutting Wire Saw<\/h1>\n <p class=\"lede rise d2\">A <strong>germanium ingot cutting wire saw<\/strong> for \u00d8 185 \u00d7 L 400 mm Ge ingots \u2014 slicing mode for production wafers, <strong>DXF contour mode<\/strong> for free-form lens blanks (crescents, off-axis shapes) that a core drill or ID saw simply cannot make.<\/p>\n <div class=\"chips rise d3\">\n <div class=\"chip\"><div class=\"v\">\u00d8 185 \u00d7 L 400<small> mm<\/small><\/div><div class=\"l\">Ingot range<\/div><\/div>\n <div class=\"chip\"><div class=\"v\">~0.5<small> mm<\/small><\/div><div class=\"l\">Closed-loop kerf<\/div><\/div>\n <div class=\"chip\"><div class=\"v\">DXF<\/div><div class=\"l\">CAD contour input<\/div><\/div>\n <div class=\"chip\"><div class=\"v\">\u00b10.01<small> mm<\/small><\/div><div class=\"l\">Y\/Z repeatability<\/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>Get a sample contour cut<\/a>\n <a class=\"btn btn-ghost\" href=\"#video\">Watch it cut<\/a>\n <\/div>\n <\/div>\n <div class=\"hero-visual rise d3\">\n <div class=\"vhead\"><span>FIG.01 \u2014 DXF CONTOUR CUT<\/span><b>SGI 40<\/b><\/div>\n <div class=\"vbody\">\n <svg class=\"geo\" viewBox=\"0 0 460 290\" width=\"100%\" role=\"img\" aria-label=\"SGI 40 germanium ingot cutting wire saw \u2014 DXF file input drives a wire path that contour-cuts a crescent-shaped lens blank out of a large germanium ingot, with kerf and material annotations\">\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=\"20\" y=\"34\" font-family=\"IBM Plex Mono\" font-size=\"11\" fill=\"#015A93\" font-weight=\"700\">DXF INPUT<\/text>\n <rect x=\"20\" y=\"44\" width=\"80\" height=\"56\" rx=\"3\" fill=\"#fff\" stroke=\"#015A93\" stroke-width=\"1.4\"\/>\n \n <path d=\"M28 70 Q40 50 60 60 Q78 70 90 64 L85 92 L34 92 Z\" fill=\"none\" stroke=\"#0274BE\" stroke-width=\"1.2\"\/>\n <text x=\"28\" y=\"115\" font-family=\"IBM Plex Mono\" font-size=\"9\" fill=\"#4E5C72\">crescent.dxf<\/text>\n\n \n <path d=\"M104 72 L130 72\" fill=\"none\" stroke=\"#0274BE\" stroke-width=\"1.4\" marker-end=\"url(#ar)\"\/>\n\n \n <text x=\"180\" y=\"34\" font-family=\"IBM Plex Mono\" font-size=\"11\" fill=\"#015A93\" font-weight=\"700\">\u00d8 185 \u00d7 L 400 mm Ge INGOT<\/text>\n <rect x=\"138\" y=\"50\" width=\"170\" height=\"190\" rx=\"4\" fill=\"#D5E8F6\" stroke=\"#015A93\" stroke-width=\"1.7\"\/>\n <text x=\"148\" y=\"232\" font-family=\"IBM Plex Mono\" font-size=\"9\" fill=\"#015A93\">germanium<\/text>\n\n \n <path d=\"M138 110 Q173 80 230 100 Q278 118 305 115 Q295 145 245 158 Q200 175 160 168 Q140 158 138 138 Z\"\n fill=\"rgba(2,116,190,.18)\" stroke=\"#14202C\" stroke-width=\"2\" stroke-dasharray=\"4 2\"\/>\n <text x=\"200\" y=\"135\" font-family=\"IBM Plex Mono\" font-size=\"9\" fill=\"#015A93\" font-weight=\"600\">wire path<\/text>\n\n \n <line x1=\"305\" y1=\"120\" x2=\"330\" y2=\"120\" stroke=\"#0274BE\" stroke-width=\"1.2\"\/>\n <text x=\"334\" y=\"124\" font-family=\"IBM Plex Mono\" font-size=\"10\" fill=\"#015A93\">kerf ~0.5<\/text>\n\n \n <path d=\"M312 145 L340 145\" fill=\"none\" stroke=\"#0274BE\" stroke-width=\"1.4\" marker-end=\"url(#ar)\"\/>\n\n \n <text x=\"346\" y=\"34\" font-family=\"IBM Plex Mono\" font-size=\"11\" fill=\"#015A93\" font-weight=\"700\">OUTPUT<\/text>\n <path d=\"M350 110 Q368 80 410 105 Q430 125 432 145 Q415 162 380 158 Q358 152 350 138 Z\"\n fill=\"#B8DBEF\" stroke=\"#015A93\" stroke-width=\"1.8\"\/>\n <text x=\"355\" y=\"184\" font-family=\"IBM Plex Mono\" font-size=\"9\" fill=\"#4E5C72\">crescent blank<\/text>\n <text x=\"355\" y=\"196\" font-family=\"IBM Plex Mono\" font-size=\"9\" fill=\"#4E5C72\">73.5 \u00d7 52.8 mm<\/text>\n\n \n <line x1=\"20\" y1=\"258\" x2=\"440\" y2=\"258\" stroke=\"#DCE7EF\" stroke-width=\"1\"\/>\n <text x=\"20\" y=\"276\" font-family=\"IBM Plex Mono\" font-size=\"10.5\" fill=\"#4E5C72\">Same machine also runs straight-slice mode \u2014 set thickness + count, hit start.<\/text>\n <\/svg>\n <\/div>\n <div class=\"vcap\">DXF in, contour-cut blank out \u2014 geometries that core drills and ID saws can't produce, off the same machine that handles routine straight slicing.<\/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 dual-mode wire saw for raw germanium ingots<\/h2>\n <p>Same closed-loop endless-wire frame as the rest of the SGI family, sized for full-size Ge ingots \u2014 \u00d8 185 mm \u00d7 L 400 mm \u2014 and equipped with both straight-slicing and DXF-driven contour-cut modes on one controller.<\/p>\n <\/div>\n <div class=\"video-wrap\">\n <figure class=\"shot\">\n <img fetchpriority=\"high\" decoding=\"async\" src=\"images\/sgi40-germanium-ingot-cutting-wire-saw.jpg\" alt=\"SGI 40 germanium ingot cutting wire saw front view with DXF panel\" 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=\"SGI 40 germanium ingot cutting wire saw \u2014 enclosed upright frame, large observation window, side touchscreen with DXF preview, three-wheel endless-wire guide system\">\n <rect x=\"0\" y=\"0\" width=\"460\" height=\"320\" fill=\"none\"\/>\n \n <rect x=\"118\" y=\"252\" width=\"232\" height=\"44\" rx=\"6\" fill=\"#015A93\"\/>\n <rect x=\"136\" y=\"296\" width=\"26\" height=\"16\" fill=\"#14202C\"\/>\n <rect x=\"306\" y=\"296\" width=\"26\" height=\"16\" fill=\"#14202C\"\/>\n \n <rect x=\"110\" y=\"42\" width=\"248\" height=\"214\" rx=\"12\" fill=\"#fff\" stroke=\"#015A93\" stroke-width=\"2.2\"\/>\n \n <rect x=\"134\" y=\"70\" width=\"150\" height=\"150\" rx=\"8\" fill=\"#D5E8F6\" stroke=\"#0274BE\" stroke-width=\"1.6\"\/>\n \n <circle cx=\"160\" cy=\"98\" r=\"14\" fill=\"#fff\" stroke=\"#015A93\" stroke-width=\"1.6\"\/>\n <circle cx=\"258\" cy=\"98\" r=\"14\" fill=\"#fff\" stroke=\"#015A93\" stroke-width=\"1.6\"\/>\n <circle cx=\"209\" cy=\"200\" r=\"11\" fill=\"#fff\" stroke=\"#015A93\" stroke-width=\"1.6\"\/>\n \n <path d=\"M160 112 Q190 130 209 189 Q230 165 258 112\" fill=\"none\" stroke=\"#0274BE\" stroke-width=\"1.8\"\/>\n <path d=\"M160 84 Q209 66 258 84\" fill=\"none\" stroke=\"#0274BE\" stroke-width=\"1.8\"\/>\n \n <rect x=\"195\" y=\"120\" width=\"28\" height=\"68\" fill=\"rgba(2,116,190,.20)\" stroke=\"#015A93\" stroke-width=\"1.4\"\/>\n <text x=\"195\" y=\"200\" font-family=\"IBM Plex Mono\" font-size=\"9\" fill=\"#015A93\">Ge ingot<\/text>\n \n <rect x=\"300\" y=\"92\" width=\"44\" height=\"78\" rx=\"5\" fill=\"#14202C\"\/>\n <rect x=\"306\" y=\"100\" width=\"32\" height=\"50\" rx=\"2\" fill=\"#0274BE\"\/>\n \n <path d=\"M310 110 Q318 104 326 110 Q334 116 336 124 L330 138 L314 138 Z\" fill=\"none\" stroke=\"#fff\" stroke-width=\"1.2\"\/>\n <line x1=\"306\" y1=\"158\" x2=\"338\" y2=\"158\" stroke=\"#2685C8\" stroke-width=\"2\"\/>\n <line x1=\"306\" y1=\"164\" x2=\"326\" y2=\"164\" stroke=\"#2685C8\" stroke-width=\"2\"\/>\n <text x=\"298\" y=\"186\" font-family=\"IBM Plex Mono\" font-size=\"9\" fill=\"#015A93\">DXF<\/text>\n \n <text x=\"134\" y=\"244\" font-family=\"Sora,sans-serif\" font-weight=\"800\" font-size=\"15\" fill=\"#015A93\">SGI 40<\/text>\n <text x=\"194\" y=\"244\" font-family=\"IBM Plex Mono\" font-size=\"10\" fill=\"#4E5C72\">CAD CONTOUR + SLICE<\/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\/sgi40-germanium-ingot-cutting-wire-saw.jpg on deploy ]<\/div>\n <\/div>\n <figcaption>SGI 40 \u2014 enclosed upright frame, DXF-driven contour mode on the side touchscreen, three-wheel endless-wire path.<\/figcaption>\n <\/figure>\n <div>\n <p>The SGI 40 germanium ingot cutting wire saw ships as a fully enclosed upright unit on the proven SGI family frame. The cabinet contains coolant mist and swarf during long runs, the observation window lets the operator watch a multi-hour contour cut, and the side touchscreen carries two parallel cutting systems \u2014 straight-slice mode and DXF contour mode \u2014 selectable per job. Load a DXF file via USB, set kerf compensation and feed rate, run the cut.<\/p>\n <ul class=\"build-list\">\n <li><b>Ingot range<\/b> \u00d8 \u2264 185 mm \u00d7 L \u2264 400 mm \u2014 full-size Ge stock<\/li>\n <li><b>Cutting modes<\/b> straight slicing \u00b7 DXF free-form contour cut<\/li>\n <li><b>Wire system<\/b> closed-loop endless diamond wire \u00b7 ~0.5 mm kerf<\/li>\n <li><b>Interface<\/b> side touchscreen + handheld controller (English) \u00b7 USB DXF import<\/li>\n <li><b>Cooling<\/b> built-in coolant tank + circulation \u00b7 mist recovery<\/li>\n <li><b>Drawing standard<\/b> ISO 10110 \u2014 contour tolerances flow station to station<\/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 SGI 40 germanium ingot cutting wire saw does<\/h2>\n <p>The germanium ingot cutting wire saw carries two cutting modes on one closed-loop endless-wire platform \u2014 straight slicing for routine production, and DXF contour cutting for shapes that traditional methods can't make. Same machine, same kerf, same hour.<\/p>\n <\/div>\n <div class=\"feat-grid\">\n <div class=\"feat\"><div class=\"num\">1<\/div><h3>DXF contour mode \u2014 free-form shapes<\/h3><p>Load a DXF file via USB, set kerf compensation, hit run. The wire follows any closed contour \u2014 crescents, off-axis lens blanks, irregular polygons. None of these geometries can be produced on a core drill or an ID saw.<\/p><\/div>\n <div class=\"feat\"><div class=\"num\">2<\/div><h3>Straight-slice mode in the same controller<\/h3><p>For routine production wafers, the second mode is just thickness + count, hit start. The machine indexes through the cut list automatically. You don't pay for the contour capability when you don't need it; you have it when you do.<\/p><\/div>\n <div class=\"feat\"><div class=\"num\">3<\/div><h3>\u00d8 \u2264 185 mm \u00d7 L \u2264 400 mm ingot capacity<\/h3><p>Full-size Ge ingot stock fits inside the enclosure. Worktable swallows the entire ingot \u2014 no pre-trimming, no fixture stack-up. Long-axis cuts (up to 400 mm) run in one pass.<\/p><\/div>\n <div class=\"feat\"><div class=\"num\">4<\/div><h3>~0.5 mm closed-loop kerf<\/h3><p>Same endless-wire kerf as every other SGI \/ SG model. On a $2,200\/kg ingot, that's $200\u2013$600 of germanium kept per ingot versus a core drill. For contour cuts where the wire follows the part outline instead of removing a shell, the saving is even bigger.<\/p><\/div>\n <div class=\"feat\"><div class=\"num\">5<\/div><h3>Servo YZ \u2014 \u00b10.01 mm repeatability<\/h3><p>Linear guides and ball screws on both axes give 0.01 mm feed resolution. Contour tolerance is bounded by the DXF file, not the machine \u2014 the machine traces what you draw.<\/p><\/div>\n <div class=\"feat\"><div class=\"num\">6<\/div><h3>Endless wire + coolant circulation<\/h3><p>Closed-loop endless diamond wire runs unidirectional \u2014 no reverse stripe on the cut face. Built-in coolant tank with circulation and mist recovery keeps a multi-hour contour run clean and the wire predictable.<\/p><\/div>\n <\/div>\n <figure class=\"photo\">\n <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.opticalcutting.com\/wp-content\/uploads\/2026\/05\/Germanium-Ingot-Cutting-Wire-Saw-effect.webp\" alt=\"germanium ingot cutting wire saw \u2014 contour-cut Ge lens blanks output\" width=\"1200\" height=\"700\" loading=\"lazy\" title=\"Vimfun glass cutting equipment is a perfect machine tool for precision cutting\">\n <figcaption>Contour-cut Ge blanks straight off the SGI series \u2014 the geometry traces a closed DXF outline, single pass, no milling step.<\/figcaption>\n <\/figure>\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 both cutting modes on a real ingot<\/h2>\n <p>The SGI 40 germanium ingot cutting wire saw carries two operating modes on the same touchscreen. Two clips below \u2014 one walking through DXF contour mode for a free-form crescent blank, one showing routine straight-slice mode.<\/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=\"SGI 40 DXF contour cut video\">\n <span class=\"play\"><svg viewBox=\"0 0 24 24\"><path d=\"M8 5v14l11-7z\"\/><\/svg><\/span>\n <span class=\"t\">DXF contour cut \u2014 crescent blank from a Ge ingot (paste embed ID on deploy)<\/span>\n <\/a>\n <p class=\"cap\">\u25b8 Contour mode \u2014 free-form CAD cut<\/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=\"SGI 40 straight slice mode video\">\n <span class=\"play\"><svg viewBox=\"0 0 24 24\"><path d=\"M8 5v14l11-7z\"\/><\/svg><\/span>\n <span class=\"t\">Straight-slice mode \u2014 multi-thickness Ge wafer slicing (paste embed ID on deploy)<\/span>\n <\/a>\n <p class=\"cap\">\u25b8 Slice mode \u2014 production wafer slicing<\/p>\n <\/div>\n <\/div>\n <p style=\"color:var(--ink-soft);font-size:15px;margin-top:18px\">Have a DXF you want to see run on the machine? Send it with your <a href=\"#quote\">sample cut request<\/a> \u2014 we'll run it on a real Ge blank and ship the result with a 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 contour cutting on the ingot saves more than slicing does<\/h2><\/div>\n <div>\n <p>A full-size Ge ingot \u2014 \u00d8 185 mm \u00d7 400 mm \u2014 is worth $20,000\u2013$40,000 at today's $1,800\u2013$2,400\/kg spot price. Standard practice for any non-round shape is to cut a rectangular blank first, then mill or grind it to the final outline. That second step removes a lot of material, and on a $2,200\/kg substrate every milligram is on the invoice.<\/p>\n <p>Here's the math for a 73 \u00d7 53 mm crescent lens blank (the geometry from a real customer use case, more on that below). Cut a rectangular blank first \u2014 kerf 0.5 mm \u00d7 4 edges, then mill the crescent profile off the rectangle. The milled-off material is roughly 35% of the rectangle, plus chipping rejects. Total Ge wasted per blank: ~6.5 g, or about $13 of material plus the milling cycle.<\/p>\n <p>Run the same part on the SGI 40 germanium ingot cutting wire saw in DXF contour mode and the wire traces the crescent outline directly. Kerf is 0.5 mm along the contour path; everything inside is the blank, everything outside is reusable Ge. Wasted material per blank: ~0.8 g, or about $1.60. <span class=\"hl\">At 1,000 blanks per year that's $11,400 of germanium kept<\/span> \u2014 before the cycle-time win from skipping the milling pass.<\/p>\n <p>For the broader Ge-line economics \u2014 kerf, edge chipping, downstream grind allowance \u2014 see our <a href=\"https:\/\/www.opticalcutting.com\/germanium-lens-manufacturing\/\">germanium lens manufacturing<\/a> solution page and <a href=\"https:\/\/www.crystran.co.uk\/optical-materials\/germanium-ge\" target=\"_blank\" rel=\"noopener noreferrer\">Crystran's germanium 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 cuts<\/div><h2>DXF in, finished blank out<\/h2><\/div>\n <div>\n <h3>The contour workflow<\/h3>\n <p>Draw the contour in any CAD package, export as DXF, load it on the SGI 40 via USB. The controller reads closed polylines and arcs; on the touchscreen you set kerf compensation (typically 0.25 mm offset for a 0.5 mm kerf), feed rate, and cut sequence if the file has multiple contours. The machine traces what the file says \u2014 contour tolerance is bounded by the DXF, not the machine.<\/p>\n <h3>Slice mode for routine production<\/h3>\n <p>Switch the controller to slicing mode and the same machine becomes a SG-class slicing platform \u2014 set thickness and quantity, supports mixed thicknesses in one job. The Y\/Z servos resolve to 0.01 mm and repeat to \u00b10.01 mm. Slice mode runs at the same kerf and feed rates as the dedicated slicing models. You're not paying for a contour capability and using a slower machine when you don't need contour.<\/p>\n <div class=\"note warn\"><div class=\"t\">\u26a0 DXF gotcha \u2014 closed polylines only<\/div><p>The contour mode reads closed polylines. Open paths get rejected by the controller at file load \u2014 saves you from a half-finished cut, but it means you can't feed in a partial geometry to \"try it.\" We see customers most often miss this on radii: drawn as arcs but not joined into the closed boundary. Fix in the CAD package, re-export, re-load. We help with the first file on every new customer.<\/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 free-form contour cutting compare to traditional methods?<\/h2><\/div>\n <div>\n <p>For non-round germanium blanks \u2014 crescents, off-axis lenses, irregular outlines \u2014 three traditional approaches exist, plus the SGI 40 germanium ingot cutting wire saw's contour mode. Each has a niche; only contour cutting actually produces the geometry directly from the ingot without a downstream removal step.<\/p>\n <table class=\"tbl\">\n <thead><tr><th>Method<\/th><th>Geometry capability<\/th><th>Material waste<\/th><th>Cycle time<\/th><\/tr><\/thead>\n <tbody>\n <tr><td>Core drill<\/td><td>round only<\/td><td>~30\u201340% (shell)<\/td><td>fast<\/td><\/tr>\n <tr><td>ID saw<\/td><td>straight cuts only<\/td><td>low<\/td><td>fast<\/td><\/tr>\n <tr><td>Rectangle + mill to shape<\/td><td>any shape<\/td><td>~35% mill-off<\/td><td>+ milling pass<\/td><\/tr>\n <tr><td class=\"hl\">SGI 40 contour mode<\/td><td class=\"hl\">any closed DXF<\/td><td class=\"hl\">kerf only (~0.5 mm path)<\/td><td class=\"hl\">single pass<\/td><\/tr>\n <\/tbody>\n <\/table>\n <p>For straight cuts on round wafers, the comparison is different \u2014 the wire saw isn't faster than a multi-wire ingot saw on parts-per-hour, but it costs much less and leaves a cleaner edge. The honest answer is: if your job is 100% straight wafers, the dedicated <a href=\"https:\/\/www.opticalcutting.com\/germanium-wafer-slicing-machine\/\">SG40 germanium wafer slicing machine<\/a> is the right model. If you also need prism, square, or polygonal blanks, the <a href=\"https:\/\/www.opticalcutting.com\/germanium-lens-blank-cutting-machine\/\">SGR40 with rotary axis<\/a> is the right model. The SGI 40's value is the DXF mode for shapes the other two can't produce \u2014 see the customer case below.<\/p>\n <div class=\"note\"><div class=\"t\">Material reference<\/div><p>Germanium properties feeding into kerf-loss math are in <a href=\"https:\/\/www.crystran.co.uk\/optical-materials\/germanium-ge\" target=\"_blank\" rel=\"noopener noreferrer\">Crystran's germanium datasheet<\/a>. Tolerance flow follows <a href=\"https:\/\/www.iso.org\/standard\/79655.html\" target=\"_blank\" rel=\"noopener noreferrer\">ISO 10110<\/a>.<\/p><\/div>\n <\/div>\n <\/div>\n<\/section>\n\n\n<section>\n <div class=\"wrap\">\n <div class=\"lab\"><div class=\"eyebrow\">Customer Case<\/div><h2>Sunny Optical \u2014 a Ge lens shape three traditional methods couldn't make<\/h2><\/div>\n <figure class=\"photo\">\n <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.opticalcutting.com\/wp-content\/uploads\/2026\/05\/Germanium-Ingot-Cutting-Wire-Saw-cut-effect.webp\" alt=\"germanium ingot cutting wire saw \u2014 close-up of cut surface and kerf on a sliced Ge blank\" width=\"1200\" height=\"700\" loading=\"lazy\" title=\"Vimfun glass cutting equipment is a perfect machine tool for precision cutting\">\n <figcaption>Cut surface off the SGI 40 \u2014 ~0.5 mm closed-loop kerf, no concentric blade marks, edge chipping under the centering allowance.<\/figcaption>\n <\/figure>\n <div class=\"case-text\">\n <p><a href=\"https:\/\/www.sunnyoptical.com\/\" target=\"_blank\" rel=\"noopener noreferrer\">Sunny Optical Technology Group<\/a> (HKSE: 2382) is one of the world's largest optical-component manufacturers. They came to us not for a kerf upgrade, but with a part traditional methods couldn't produce \u2014 an asymmetric crescent germanium lens for a thermal-imaging system. Outline: 73.45 \u00d7 52.82 mm, two R6 corner radii, two R1 transitions, a 110\u00b0 \u00d7 1\u00b0 upper chamfer, and an 85 mm spherical optical face.<\/p>\n <p>Each traditional method fails on this part for a different reason. A core drill produces round shapes only \u2014 the crescent profile is outside its geometric envelope. An ID saw cuts straight lines, so multiple repositioning cuts are needed for the R1\/R6 arcs, with stack-up tolerance error and re-fixturing chips on every step. The \"rectangle blank + mill to shape\" approach is geometrically feasible but loses ~35% of starting material to milling waste, and the R-corner regions chip readily during the milling pass. Sunny tried all three; throughput, yield, and repeatability all failed at the volumes they needed to ship.<\/p>\n <p>The solution was the SGI 20 \u2014 the smaller sibling of the SGI 40 germanium ingot cutting wire saw on this page, running the same closed-loop endless-wire technology and the same DXF contour mode. One Vimfun engineer worked with Sunny's tooling team to convert their crescent drawing to a DXF, set kerf compensation, and run the first batch. The wire traced the crescent profile directly out of the Ge stock \u2014 kerf 0.4 mm along the contour, single-pass, no milling.<\/p>\n <div class=\"note\"><div class=\"t\">Outcomes Sunny Optical reported<\/div><p>After integrating the SGI machine into the crescent-lens line, Sunny reported a <span class=\"hl\">~30% production yield improvement<\/span> \u2014 chip rejects from the R-corner regions disappeared, and the same machine also handled their routine straight-slice and rod-extraction work in slice mode. Sunny has since scaled their Vimfun footprint to <span class=\"hl\">30+ machines<\/span> across multiple production sites, covering both contour work and routine slicing on the same platform.<\/p><\/div>\n <p>For full-size ingot work (\u00d8 185 mm class, longer ingots), the SGI 40 germanium ingot cutting wire saw is the right model for the same kind of unique-geometry job. The DXF mode, the closed-loop wire, the kerf compensation logic \u2014 all identical to the platform Sunny scaled on. Send us your part drawing and we'll convert it to DXF, run a sample contour cut on your supplied Ge blank, and ship back the part with a metrology report.<\/p>\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 full-size Ge ingots and free-form blanks<\/h2>\n <p>What the SGI 40 germanium ingot cutting wire saw commits to \u2014 the numbers that drive yield on a $30,000 ingot and unlock shapes traditional cutting can't make.<\/p>\n <\/div>\n <div class=\"hl-grid\">\n <div class=\"hl-card\"><div class=\"ic\"><svg viewBox=\"0 0 24 24\"><path d=\"M4 6h16M4 12h16M4 18h16\"\/><\/svg><\/div><div><div class=\"v\">DXF contour mode<\/div><div class=\"d\">Load a closed-polyline DXF, cut the shape directly from the ingot.<\/div><\/div><\/div>\n <div class=\"hl-card\"><div class=\"ic\"><svg viewBox=\"0 0 24 24\"><circle cx=\"12\" cy=\"12\" r=\"9\"\/><path d=\"M3 12h18\"\/><\/svg><\/div><div><div class=\"v\">\u00d8 185 \u00d7 L 400 mm<\/div><div class=\"d\">Full-size Ge ingot fits inside the enclosure \u2014 no pre-trimming.<\/div><\/div><\/div>\n <div class=\"hl-card\"><div class=\"ic\"><svg viewBox=\"0 0 24 24\"><path d=\"M4 14h6L13 7l3 10h4\"\/><\/svg><\/div><div><div class=\"v\">~0.5 mm kerf<\/div><div class=\"d\">Closed-loop endless wire, kerf near the wire diameter.<\/div><\/div><\/div>\n <div class=\"hl-card\"><div class=\"ic\"><svg viewBox=\"0 0 24 24\"><circle cx=\"12\" cy=\"12\" r=\"8\"\/><path d=\"M12 8v4l3 2\"\/><\/svg><\/div><div><div class=\"v\">\u00b10.01 mm Y\/Z<\/div><div class=\"d\">Servo linear stages \u2014 contour tolerance bounded by your DXF, not the machine.<\/div><\/div><\/div>\n <div class=\"hl-card\"><div class=\"ic\"><svg viewBox=\"0 0 24 24\"><path d=\"M3 7h18M3 12h18M3 17h18\"\/><\/svg><\/div><div><div class=\"v\">Multi-material<\/div><div class=\"d\">Ge, ZnSe, ZnS, silicon, sapphire, optical glass.<\/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 sample cut<\/div><div class=\"d\">Send a DXF and a Ge blank; we ship back the contour-cut part + report.<\/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>SGI 40 technical specifications<\/h2><\/div>\n <div>\n <p>Standard-configuration specs for the SGI 40 germanium ingot cutting wire saw. Worktable, travel, and contour-mode parameters configurable on request.<\/p>\n <table class=\"tbl datasheet\"><tbody>\n <tr><td>Workpiece size (ingot)<\/td><td>\u00d8 \u2264 185 mm \u00d7 L \u2264 400 mm<\/td><\/tr>\n <tr><td>Worktable size<\/td><td>400 \u00d7 400 mm<\/td><\/tr>\n <tr><td>Y \/ Z axis travel<\/td><td>400 mm \/ 400 mm<\/td><\/tr>\n <tr><td>Cutting modes<\/td><td>straight slicing \u00b7 DXF closed-contour cut<\/td><\/tr>\n <tr><td>DXF input<\/td><td>USB \u00b7 closed polylines & arcs \u00b7 kerf compensation programmable<\/td><\/tr>\n <tr><td>Diamond wire diameter<\/td><td>0.35\u20130.5 mm (Ge optimum)<\/td><\/tr>\n <tr><td>Kerf width<\/td><td>~0.5 mm (closed-loop endless wire)<\/td><\/tr>\n <tr><td>Max wire linear speed<\/td><td>52 m\/s<\/td><\/tr>\n <tr><td>Y \/ Z minimum feed<\/td><td>0.01 mm<\/td><\/tr>\n <tr><td>Y \/ Z repeatability<\/td><td>\u00b10.01 mm<\/td><\/tr>\n <tr><td>Cutting \/ manual speed<\/td><td>0\u20131000 mm\/min (adjustable)<\/td><\/tr>\n <tr><td>Guide wheels<\/td><td>2 \u00d7 \u00d8250 mm + 1 \u00d7 \u00d8180 mm (3-wheel path)<\/td><\/tr>\n <tr><td>Drive motor power<\/td><td>1.5 kW (max 4500 RPM)<\/td><\/tr>\n <tr><td>Power supply<\/td><td>220 V three-phase \u00b7 60 Hz<\/td><\/tr>\n <tr><td>Cooling<\/td><td>built-in coolant tank + circulation + mist recovery<\/td><\/tr>\n <tr><td>Cutting oil consumption (single shift)<\/td><td>~80 L \/ month<\/td><\/tr>\n <tr><td>Drawing standard<\/td><td>ISO 10110<\/td><\/tr>\n <tr><td>Warranty<\/td><td>1 year (parts + engineering support)<\/td><\/tr>\n <\/tbody><\/table>\n <p>Tolerances on the cut blank \u2014 kerf, edge chipping, contour deviation \u2014 flow into the centering and grinding stages per <a href=\"https:\/\/www.iso.org\/standard\/79655.html\" target=\"_blank\" rel=\"noopener noreferrer\">ISO 10110<\/a>.<\/p>\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>Which materials does the SGI 40 cut?<\/h2><\/div>\n <div>\n <p>The endless wire cuts anything softer than diamond, but the SGI 40 was built around full-size germanium ingot work \u2014 that's where the \u00d8 185 \u00d7 L 400 mm capacity and the DXF contour mode pay back first. Other brittle optics materials run on the same platform with their own parameter sets:<\/p>\n <ul class=\"clean\">\n <li><strong>Germanium (Ge)<\/strong> \u2014 primary material \u00b7 0.35\u20130.5 mm wire, 100\u2013140 N tension, white mineral oil coolant<\/li>\n <li><strong>Silicon (Si)<\/strong> \u2014 mature parameter set \u00b7 0.42\u20130.5 mm wire<\/li>\n <li><strong>Zinc selenide (ZnSe) & zinc sulfide (ZnS)<\/strong> \u2014 chalcogenide windows \u00b7 gentler infeed<\/li>\n <li><strong>Sapphire<\/strong> \u2014 0.5\u20130.65 mm wire, higher tension, slower feed<\/li>\n <li><strong>Optical glass (BK7 \/ K9) and fused quartz<\/strong> \u2014 same closed-loop wire, parameter set per glass family<\/li>\n <\/ul>\n <p>Cutting something not on the list \u2014 chalcogenide glass, exotic ceramic, layered composite? Send a sample and we'll test-cut it before quoting parameters. We don't guess on materials we haven't run.<\/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 SGI 40 fit in a Ge lens line?<\/h2><\/div>\n <div>\n <p>The SGI 40 germanium ingot cutting wire saw is the front end for any production that includes free-form Ge lens blanks alongside routine wafers. It takes ingots in (\u00d8 \u2264 185 \u00d7 L \u2264 400 mm) and outputs either straight-sliced wafers or DXF-defined contour blanks, in the same machine, on the same shift. Everything downstream \u2014 edge centering, spherical grinding, polishing, AR coating \u2014 flows from what this machine cuts.<\/p>\n <p>For the full chain \u2014 five-stage workflow from ingot to coated lens \u2014 see the <a href=\"https:\/\/www.opticalcutting.com\/germanium-lens-manufacturing\/\">germanium lens manufacturing<\/a> solution page. The broader 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 cutting machine<\/div><p>If your job is 100% round wafer slicing at production volume, the leaner <a href=\"https:\/\/www.opticalcutting.com\/germanium-wafer-slicing-machine\/\">SG40 germanium wafer slicing machine<\/a> covers it at lower CapEx \u2014 same kerf, no contour-mode capability you wouldn't use. If your job mixes round wafers with prism, square, or polygonal blanks (predefined geometric shapes via rotary indexing \u2014 not free-form curves), the <a href=\"https:\/\/www.opticalcutting.com\/germanium-lens-blank-cutting-machine\/\">SGR40 with rotary axis<\/a> covers that with the same closed-loop wire. The SGI 40's exclusive value is the DXF mode for shapes neither of the other two can make.<\/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 contour cut on your own Ge ingot<\/h2>\n <p>Pick the SGI 40 germanium ingot cutting wire saw if your production includes free-form Ge lens blanks that core drills and ID saws can't make \u2014 crescents, off-axis shapes, irregular polygons \u2014 and you still want a single machine that handles routine straight wafer slicing too. Send us your DXF and a Ge sample; we'll convert if needed, run the contour, and ship the cut part back with a metrology report before you commit.<\/p>\n <\/div>\n <div>\n <a class=\"btn\" href=\"mailto:daria@endlesswiresaw.com?subject=SGI%2040%20germanium%20ingot%20cutting%20wire%20saw%20\u2014%20sample%20contour%20cut%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 contour cut & 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":"<ul>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">DXF \uc724\uacfd \ubaa8\ub4dc<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">\u00d8400 \u00d7 L 400 mm<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">\uc2ac\ub77c\uc774\uc2f1+\uc724\uacfd \uc808\ub2e8 \ud55c \ubc88\uc5d0<\/li>\n<\/ul>","protected":false},"featured_media":4835,"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 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\n\t\t\t\t

\n\t\t\t\t\t\n\n\n\n\nGermanium Ingot Cutting Wire Saw: SGI 40 with CAD Contour Cut<\/title>\n<meta name=\"description\" content=\"The SGI 40 germanium ingot cutting wire saw cuts \u00d8 185 \u00d7 400 mm Ge ingots and runs DXF contour cuts on the same machine. Request a sample cut.\">\n<link rel=\"canonical\" href=\"https:\/\/www.opticalcutting.com\/germanium-ingot-cutting-wire-saw\/\">\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n<link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin>\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=Sora:wght@500;600;700;800&family=Mulish:wght@400;500;600;700&family=IBM+Plex+Mono:wght@500;600&display=swap\" rel=\"stylesheet\">\n<style>\n :root{\n --white:#ffffff;\n --bg:#F2F8FD;\n --bg-2:#D5E8F6;\n --ink:#14202C;\n --ink-soft:#4E5C72;\n --blue:#0274BE;\n --blue-dark:#015A93;\n --blue-deep:#013D66;\n --blue-tint:#E1F0FB;\n --line:#DCE7EF;\n --line-2:#B8DBEF;\n --sans:'Mulish',sans-serif;\n --disp:'Sora',sans-serif;\n --mono:'IBM Plex Mono',monospace;\n }\n *{margin:0;padding:0;box-sizing:border-box}\n html{scroll-behavior:smooth}\n 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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 \/* customer-case text: override the global p max-width so paragraphs fill the column *\/\n .case-text p, .case-text ul, .case-text .note{max-width:none}\n<\/style>\n<\/head>\n<body>\n\n<section class=\"hero\">\n <div class=\"wrap\">\n <div>\n <div class=\"model-line rise d1\">SGI 40 \u00b7 CAD Contour + Slicing Wire Saw<\/div>\n <h1 class=\"rise d2\">Germanium Ingot Cutting Wire Saw<\/h1>\n <p class=\"lede rise d2\">A <strong>germanium ingot cutting wire saw<\/strong> for \u00d8 185 \u00d7 L 400 mm Ge ingots \u2014 slicing mode for production wafers, <strong>DXF contour mode<\/strong> for free-form lens blanks (crescents, off-axis shapes) that a core drill or ID saw simply cannot make.<\/p>\n <div class=\"chips rise d3\">\n <div class=\"chip\"><div class=\"v\">\u00d8 185 \u00d7 L 400<small> mm<\/small><\/div><div class=\"l\">Ingot range<\/div><\/div>\n <div class=\"chip\"><div class=\"v\">~0.5<small> mm<\/small><\/div><div class=\"l\">Closed-loop kerf<\/div><\/div>\n <div class=\"chip\"><div class=\"v\">DXF<\/div><div class=\"l\">CAD contour input<\/div><\/div>\n <div class=\"chip\"><div class=\"v\">\u00b10.01<small> mm<\/small><\/div><div class=\"l\">Y\/Z repeatability<\/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>Get a sample contour cut<\/a>\n <a class=\"btn btn-ghost\" href=\"#video\">Watch it cut<\/a>\n <\/div>\n <\/div>\n <div class=\"hero-visual rise d3\">\n <div class=\"vhead\"><span>FIG.01 \u2014 DXF CONTOUR CUT<\/span><b>SGI 40<\/b><\/div>\n <div class=\"vbody\">\n <svg class=\"geo\" viewBox=\"0 0 460 290\" width=\"100%\" role=\"img\" aria-label=\"SGI 40 germanium ingot cutting wire saw \u2014 DXF file input drives a wire path that contour-cuts a crescent-shaped lens blank out of a large germanium ingot, with kerf and material annotations\">\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=\"20\" y=\"34\" font-family=\"IBM Plex Mono\" font-size=\"11\" fill=\"#015A93\" font-weight=\"700\">DXF INPUT<\/text>\n <rect x=\"20\" y=\"44\" width=\"80\" height=\"56\" rx=\"3\" fill=\"#fff\" stroke=\"#015A93\" stroke-width=\"1.4\"\/>\n \n <path d=\"M28 70 Q40 50 60 60 Q78 70 90 64 L85 92 L34 92 Z\" fill=\"none\" stroke=\"#0274BE\" stroke-width=\"1.2\"\/>\n <text x=\"28\" y=\"115\" font-family=\"IBM Plex Mono\" font-size=\"9\" fill=\"#4E5C72\">crescent.dxf<\/text>\n\n \n <path d=\"M104 72 L130 72\" fill=\"none\" stroke=\"#0274BE\" stroke-width=\"1.4\" marker-end=\"url(#ar)\"\/>\n\n \n <text x=\"180\" y=\"34\" font-family=\"IBM Plex Mono\" font-size=\"11\" fill=\"#015A93\" font-weight=\"700\">\u00d8 185 \u00d7 L 400 mm Ge INGOT<\/text>\n <rect x=\"138\" y=\"50\" width=\"170\" height=\"190\" rx=\"4\" fill=\"#D5E8F6\" stroke=\"#015A93\" stroke-width=\"1.7\"\/>\n <text x=\"148\" y=\"232\" font-family=\"IBM Plex Mono\" font-size=\"9\" fill=\"#015A93\">germanium<\/text>\n\n \n <path d=\"M138 110 Q173 80 230 100 Q278 118 305 115 Q295 145 245 158 Q200 175 160 168 Q140 158 138 138 Z\"\n fill=\"rgba(2,116,190,.18)\" stroke=\"#14202C\" stroke-width=\"2\" stroke-dasharray=\"4 2\"\/>\n <text x=\"200\" y=\"135\" font-family=\"IBM Plex Mono\" font-size=\"9\" fill=\"#015A93\" font-weight=\"600\">wire path<\/text>\n\n \n <line x1=\"305\" y1=\"120\" x2=\"330\" y2=\"120\" stroke=\"#0274BE\" stroke-width=\"1.2\"\/>\n <text x=\"334\" y=\"124\" font-family=\"IBM Plex Mono\" font-size=\"10\" fill=\"#015A93\">kerf ~0.5<\/text>\n\n \n <path d=\"M312 145 L340 145\" fill=\"none\" stroke=\"#0274BE\" stroke-width=\"1.4\" marker-end=\"url(#ar)\"\/>\n\n \n <text x=\"346\" y=\"34\" font-family=\"IBM Plex Mono\" font-size=\"11\" fill=\"#015A93\" font-weight=\"700\">OUTPUT<\/text>\n <path d=\"M350 110 Q368 80 410 105 Q430 125 432 145 Q415 162 380 158 Q358 152 350 138 Z\"\n fill=\"#B8DBEF\" stroke=\"#015A93\" stroke-width=\"1.8\"\/>\n <text x=\"355\" y=\"184\" font-family=\"IBM Plex Mono\" font-size=\"9\" fill=\"#4E5C72\">crescent blank<\/text>\n <text x=\"355\" y=\"196\" font-family=\"IBM Plex Mono\" font-size=\"9\" fill=\"#4E5C72\">73.5 \u00d7 52.8 mm<\/text>\n\n \n <line x1=\"20\" y1=\"258\" x2=\"440\" y2=\"258\" stroke=\"#DCE7EF\" stroke-width=\"1\"\/>\n <text x=\"20\" y=\"276\" font-family=\"IBM Plex Mono\" font-size=\"10.5\" fill=\"#4E5C72\">Same machine also runs straight-slice mode \u2014 set thickness + count, hit start.<\/text>\n <\/svg>\n <\/div>\n <div class=\"vcap\">DXF in, contour-cut blank out \u2014 geometries that core drills and ID saws can't produce, off the same machine that handles routine straight slicing.<\/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 dual-mode wire saw for raw germanium ingots<\/h2>\n <p>Same closed-loop endless-wire frame as the rest of the SGI family, sized for full-size Ge ingots \u2014 \u00d8 185 mm \u00d7 L 400 mm \u2014 and equipped with both straight-slicing and DXF-driven contour-cut modes on one controller.<\/p>\n <\/div>\n <div class=\"video-wrap\">\n <figure class=\"shot\">\n <img fetchpriority=\"high\" decoding=\"async\" src=\"images\/sgi40-germanium-ingot-cutting-wire-saw.jpg\" alt=\"SGI 40 germanium ingot cutting wire saw front view with DXF panel\" 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=\"SGI 40 germanium ingot cutting wire saw \u2014 enclosed upright frame, large observation window, side touchscreen with DXF preview, three-wheel endless-wire guide system\">\n <rect x=\"0\" y=\"0\" width=\"460\" height=\"320\" fill=\"none\"\/>\n \n <rect x=\"118\" y=\"252\" width=\"232\" height=\"44\" rx=\"6\" fill=\"#015A93\"\/>\n <rect x=\"136\" y=\"296\" width=\"26\" height=\"16\" fill=\"#14202C\"\/>\n <rect x=\"306\" y=\"296\" width=\"26\" height=\"16\" fill=\"#14202C\"\/>\n \n <rect x=\"110\" y=\"42\" width=\"248\" height=\"214\" rx=\"12\" fill=\"#fff\" stroke=\"#015A93\" stroke-width=\"2.2\"\/>\n \n <rect x=\"134\" y=\"70\" width=\"150\" height=\"150\" rx=\"8\" fill=\"#D5E8F6\" stroke=\"#0274BE\" stroke-width=\"1.6\"\/>\n \n <circle cx=\"160\" cy=\"98\" r=\"14\" fill=\"#fff\" stroke=\"#015A93\" stroke-width=\"1.6\"\/>\n <circle cx=\"258\" cy=\"98\" r=\"14\" fill=\"#fff\" stroke=\"#015A93\" stroke-width=\"1.6\"\/>\n <circle cx=\"209\" cy=\"200\" r=\"11\" fill=\"#fff\" stroke=\"#015A93\" stroke-width=\"1.6\"\/>\n \n <path d=\"M160 112 Q190 130 209 189 Q230 165 258 112\" fill=\"none\" stroke=\"#0274BE\" stroke-width=\"1.8\"\/>\n <path d=\"M160 84 Q209 66 258 84\" fill=\"none\" stroke=\"#0274BE\" stroke-width=\"1.8\"\/>\n \n <rect x=\"195\" y=\"120\" width=\"28\" height=\"68\" fill=\"rgba(2,116,190,.20)\" stroke=\"#015A93\" stroke-width=\"1.4\"\/>\n <text x=\"195\" y=\"200\" font-family=\"IBM Plex Mono\" font-size=\"9\" fill=\"#015A93\">Ge ingot<\/text>\n \n <rect x=\"300\" y=\"92\" width=\"44\" height=\"78\" rx=\"5\" fill=\"#14202C\"\/>\n <rect x=\"306\" y=\"100\" width=\"32\" height=\"50\" rx=\"2\" fill=\"#0274BE\"\/>\n \n <path d=\"M310 110 Q318 104 326 110 Q334 116 336 124 L330 138 L314 138 Z\" fill=\"none\" stroke=\"#fff\" stroke-width=\"1.2\"\/>\n <line x1=\"306\" y1=\"158\" x2=\"338\" y2=\"158\" stroke=\"#2685C8\" stroke-width=\"2\"\/>\n <line x1=\"306\" y1=\"164\" x2=\"326\" y2=\"164\" stroke=\"#2685C8\" stroke-width=\"2\"\/>\n <text x=\"298\" y=\"186\" font-family=\"IBM Plex Mono\" font-size=\"9\" fill=\"#015A93\">DXF<\/text>\n \n <text x=\"134\" y=\"244\" font-family=\"Sora,sans-serif\" font-weight=\"800\" font-size=\"15\" fill=\"#015A93\">SGI 40<\/text>\n <text x=\"194\" y=\"244\" font-family=\"IBM Plex Mono\" font-size=\"10\" fill=\"#4E5C72\">CAD CONTOUR + SLICE<\/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\/sgi40-germanium-ingot-cutting-wire-saw.jpg on deploy ]<\/div>\n <\/div>\n <figcaption>SGI 40 \u2014 enclosed upright frame, DXF-driven contour mode on the side touchscreen, three-wheel endless-wire path.<\/figcaption>\n <\/figure>\n <div>\n <p>The SGI 40 germanium ingot cutting wire saw ships as a fully enclosed upright unit on the proven SGI family frame. The cabinet contains coolant mist and swarf during long runs, the observation window lets the operator watch a multi-hour contour cut, and the side touchscreen carries two parallel cutting systems \u2014 straight-slice mode and DXF contour mode \u2014 selectable per job. Load a DXF file via USB, set kerf compensation and feed rate, run the cut.<\/p>\n <ul class=\"build-list\">\n <li><b>Ingot range<\/b> \u00d8 \u2264 185 mm \u00d7 L \u2264 400 mm \u2014 full-size Ge stock<\/li>\n <li><b>Cutting modes<\/b> straight slicing \u00b7 DXF free-form contour cut<\/li>\n <li><b>Wire system<\/b> closed-loop endless diamond wire \u00b7 ~0.5 mm kerf<\/li>\n <li><b>Interface<\/b> side touchscreen + handheld controller (English) \u00b7 USB DXF import<\/li>\n <li><b>Cooling<\/b> built-in coolant tank + circulation \u00b7 mist recovery<\/li>\n <li><b>Drawing standard<\/b> ISO 10110 \u2014 contour tolerances flow station to station<\/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 SGI 40 germanium ingot cutting wire saw does<\/h2>\n <p>The germanium ingot cutting wire saw carries two cutting modes on one closed-loop endless-wire platform \u2014 straight slicing for routine production, and DXF contour cutting for shapes that traditional methods can't make. Same machine, same kerf, same hour.<\/p>\n <\/div>\n <div class=\"feat-grid\">\n <div class=\"feat\"><div class=\"num\">1<\/div><h3>DXF contour mode \u2014 free-form shapes<\/h3><p>Load a DXF file via USB, set kerf compensation, hit run. The wire follows any closed contour \u2014 crescents, off-axis lens blanks, irregular polygons. None of these geometries can be produced on a core drill or an ID saw.<\/p><\/div>\n <div class=\"feat\"><div class=\"num\">2<\/div><h3>Straight-slice mode in the same controller<\/h3><p>For routine production wafers, the second mode is just thickness + count, hit start. The machine indexes through the cut list automatically. You don't pay for the contour capability when you don't need it; you have it when you do.<\/p><\/div>\n <div class=\"feat\"><div class=\"num\">3<\/div><h3>\u00d8 \u2264 185 mm \u00d7 L \u2264 400 mm ingot capacity<\/h3><p>Full-size Ge ingot stock fits inside the enclosure. Worktable swallows the entire ingot \u2014 no pre-trimming, no fixture stack-up. Long-axis cuts (up to 400 mm) run in one pass.<\/p><\/div>\n <div class=\"feat\"><div class=\"num\">4<\/div><h3>~0.5 mm closed-loop kerf<\/h3><p>Same endless-wire kerf as every other SGI \/ SG model. On a $2,200\/kg ingot, that's $200\u2013$600 of germanium kept per ingot versus a core drill. For contour cuts where the wire follows the part outline instead of removing a shell, the saving is even bigger.<\/p><\/div>\n <div class=\"feat\"><div class=\"num\">5<\/div><h3>Servo YZ \u2014 \u00b10.01 mm repeatability<\/h3><p>Linear guides and ball screws on both axes give 0.01 mm feed resolution. Contour tolerance is bounded by the DXF file, not the machine \u2014 the machine traces what you draw.<\/p><\/div>\n <div class=\"feat\"><div class=\"num\">6<\/div><h3>Endless wire + coolant circulation<\/h3><p>Closed-loop endless diamond wire runs unidirectional \u2014 no reverse stripe on the cut face. Built-in coolant tank with circulation and mist recovery keeps a multi-hour contour run clean and the wire predictable.<\/p><\/div>\n <\/div>\n <figure class=\"photo\">\n <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.opticalcutting.com\/wp-content\/uploads\/2026\/05\/Germanium-Ingot-Cutting-Wire-Saw-effect.webp\" alt=\"germanium ingot cutting wire saw \u2014 contour-cut Ge lens blanks output\" width=\"1200\" height=\"700\" loading=\"lazy\" title=\"Vimfun glass cutting equipment is a perfect machine tool for precision cutting\">\n <figcaption>Contour-cut Ge blanks straight off the SGI series \u2014 the geometry traces a closed DXF outline, single pass, no milling step.<\/figcaption>\n <\/figure>\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 both cutting modes on a real ingot<\/h2>\n <p>The SGI 40 germanium ingot cutting wire saw carries two operating modes on the same touchscreen. Two clips below \u2014 one walking through DXF contour mode for a free-form crescent blank, one showing routine straight-slice mode.<\/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=\"SGI 40 DXF contour cut video\">\n <span class=\"play\"><svg viewBox=\"0 0 24 24\"><path d=\"M8 5v14l11-7z\"\/><\/svg><\/span>\n <span class=\"t\">DXF contour cut \u2014 crescent blank from a Ge ingot (paste embed ID on deploy)<\/span>\n <\/a>\n <p class=\"cap\">\u25b8 Contour mode \u2014 free-form CAD cut<\/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=\"SGI 40 straight slice mode video\">\n <span class=\"play\"><svg viewBox=\"0 0 24 24\"><path d=\"M8 5v14l11-7z\"\/><\/svg><\/span>\n <span class=\"t\">Straight-slice mode \u2014 multi-thickness Ge wafer slicing (paste embed ID on deploy)<\/span>\n <\/a>\n <p class=\"cap\">\u25b8 Slice mode \u2014 production wafer slicing<\/p>\n <\/div>\n <\/div>\n <p style=\"color:var(--ink-soft);font-size:15px;margin-top:18px\">Have a DXF you want to see run on the machine? Send it with your <a href=\"#quote\">sample cut request<\/a> \u2014 we'll run it on a real Ge blank and ship the result with a 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 contour cutting on the ingot saves more than slicing does<\/h2><\/div>\n <div>\n <p>A full-size Ge ingot \u2014 \u00d8 185 mm \u00d7 400 mm \u2014 is worth $20,000\u2013$40,000 at today's $1,800\u2013$2,400\/kg spot price. Standard practice for any non-round shape is to cut a rectangular blank first, then mill or grind it to the final outline. That second step removes a lot of material, and on a $2,200\/kg substrate every milligram is on the invoice.<\/p>\n <p>Here's the math for a 73 \u00d7 53 mm crescent lens blank (the geometry from a real customer use case, more on that below). Cut a rectangular blank first \u2014 kerf 0.5 mm \u00d7 4 edges, then mill the crescent profile off the rectangle. The milled-off material is roughly 35% of the rectangle, plus chipping rejects. Total Ge wasted per blank: ~6.5 g, or about $13 of material plus the milling cycle.<\/p>\n <p>Run the same part on the SGI 40 germanium ingot cutting wire saw in DXF contour mode and the wire traces the crescent outline directly. Kerf is 0.5 mm along the contour path; everything inside is the blank, everything outside is reusable Ge. Wasted material per blank: ~0.8 g, or about $1.60. <span class=\"hl\">At 1,000 blanks per year that's $11,400 of germanium kept<\/span> \u2014 before the cycle-time win from skipping the milling pass.<\/p>\n <p>For the broader Ge-line economics \u2014 kerf, edge chipping, downstream grind allowance \u2014 see our <a href=\"https:\/\/www.opticalcutting.com\/germanium-lens-manufacturing\/\">germanium lens manufacturing<\/a> solution page and <a href=\"https:\/\/www.crystran.co.uk\/optical-materials\/germanium-ge\" target=\"_blank\" rel=\"noopener noreferrer\">Crystran's germanium 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 cuts<\/div><h2>DXF in, finished blank out<\/h2><\/div>\n <div>\n <h3>The contour workflow<\/h3>\n <p>Draw the contour in any CAD package, export as DXF, load it on the SGI 40 via USB. The controller reads closed polylines and arcs; on the touchscreen you set kerf compensation (typically 0.25 mm offset for a 0.5 mm kerf), feed rate, and cut sequence if the file has multiple contours. The machine traces what the file says \u2014 contour tolerance is bounded by the DXF, not the machine.<\/p>\n <h3>Slice mode for routine production<\/h3>\n <p>Switch the controller to slicing mode and the same machine becomes a SG-class slicing platform \u2014 set thickness and quantity, supports mixed thicknesses in one job. The Y\/Z servos resolve to 0.01 mm and repeat to \u00b10.01 mm. Slice mode runs at the same kerf and feed rates as the dedicated slicing models. You're not paying for a contour capability and using a slower machine when you don't need contour.<\/p>\n <div class=\"note warn\"><div class=\"t\">\u26a0 DXF gotcha \u2014 closed polylines only<\/div><p>The contour mode reads closed polylines. Open paths get rejected by the controller at file load \u2014 saves you from a half-finished cut, but it means you can't feed in a partial geometry to \"try it.\" We see customers most often miss this on radii: drawn as arcs but not joined into the closed boundary. Fix in the CAD package, re-export, re-load. We help with the first file on every new customer.<\/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 free-form contour cutting compare to traditional methods?<\/h2><\/div>\n <div>\n <p>For non-round germanium blanks \u2014 crescents, off-axis lenses, irregular outlines \u2014 three traditional approaches exist, plus the SGI 40 germanium ingot cutting wire saw's contour mode. Each has a niche; only contour cutting actually produces the geometry directly from the ingot without a downstream removal step.<\/p>\n <table class=\"tbl\">\n <thead><tr><th>Method<\/th><th>Geometry capability<\/th><th>Material waste<\/th><th>Cycle time<\/th><\/tr><\/thead>\n <tbody>\n <tr><td>Core drill<\/td><td>round only<\/td><td>~30\u201340% (shell)<\/td><td>fast<\/td><\/tr>\n <tr><td>ID saw<\/td><td>straight cuts only<\/td><td>low<\/td><td>fast<\/td><\/tr>\n <tr><td>Rectangle + mill to shape<\/td><td>any shape<\/td><td>~35% mill-off<\/td><td>+ milling pass<\/td><\/tr>\n <tr><td class=\"hl\">SGI 40 contour mode<\/td><td class=\"hl\">any closed DXF<\/td><td class=\"hl\">kerf only (~0.5 mm path)<\/td><td class=\"hl\">single pass<\/td><\/tr>\n <\/tbody>\n <\/table>\n <p>For straight cuts on round wafers, the comparison is different \u2014 the wire saw isn't faster than a multi-wire ingot saw on parts-per-hour, but it costs much less and leaves a cleaner edge. The honest answer is: if your job is 100% straight wafers, the dedicated <a href=\"https:\/\/www.opticalcutting.com\/germanium-wafer-slicing-machine\/\">SG40 germanium wafer slicing machine<\/a> is the right model. If you also need prism, square, or polygonal blanks, the <a href=\"https:\/\/www.opticalcutting.com\/germanium-lens-blank-cutting-machine\/\">SGR40 with rotary axis<\/a> is the right model. The SGI 40's value is the DXF mode for shapes the other two can't produce \u2014 see the customer case below.<\/p>\n <div class=\"note\"><div class=\"t\">Material reference<\/div><p>Germanium properties feeding into kerf-loss math are in <a href=\"https:\/\/www.crystran.co.uk\/optical-materials\/germanium-ge\" target=\"_blank\" rel=\"noopener noreferrer\">Crystran's germanium datasheet<\/a>. Tolerance flow follows <a href=\"https:\/\/www.iso.org\/standard\/79655.html\" target=\"_blank\" rel=\"noopener noreferrer\">ISO 10110<\/a>.<\/p><\/div>\n <\/div>\n <\/div>\n<\/section>\n\n\n<section>\n <div class=\"wrap\">\n <div class=\"lab\"><div class=\"eyebrow\">Customer Case<\/div><h2>Sunny Optical \u2014 a Ge lens shape three traditional methods couldn't make<\/h2><\/div>\n <figure class=\"photo\">\n <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.opticalcutting.com\/wp-content\/uploads\/2026\/05\/Germanium-Ingot-Cutting-Wire-Saw-cut-effect.webp\" alt=\"germanium ingot cutting wire saw \u2014 close-up of cut surface and kerf on a sliced Ge blank\" width=\"1200\" height=\"700\" loading=\"lazy\" title=\"Vimfun glass cutting equipment is a perfect machine tool for precision cutting\">\n <figcaption>Cut surface off the SGI 40 \u2014 ~0.5 mm closed-loop kerf, no concentric blade marks, edge chipping under the centering allowance.<\/figcaption>\n <\/figure>\n <div class=\"case-text\">\n <p><a href=\"https:\/\/www.sunnyoptical.com\/\" target=\"_blank\" rel=\"noopener noreferrer\">Sunny Optical Technology Group<\/a> (HKSE: 2382) is one of the world's largest optical-component manufacturers. They came to us not for a kerf upgrade, but with a part traditional methods couldn't produce \u2014 an asymmetric crescent germanium lens for a thermal-imaging system. Outline: 73.45 \u00d7 52.82 mm, two R6 corner radii, two R1 transitions, a 110\u00b0 \u00d7 1\u00b0 upper chamfer, and an 85 mm spherical optical face.<\/p>\n <p>Each traditional method fails on this part for a different reason. A core drill produces round shapes only \u2014 the crescent profile is outside its geometric envelope. An ID saw cuts straight lines, so multiple repositioning cuts are needed for the R1\/R6 arcs, with stack-up tolerance error and re-fixturing chips on every step. The \"rectangle blank + mill to shape\" approach is geometrically feasible but loses ~35% of starting material to milling waste, and the R-corner regions chip readily during the milling pass. Sunny tried all three; throughput, yield, and repeatability all failed at the volumes they needed to ship.<\/p>\n <p>The solution was the SGI 20 \u2014 the smaller sibling of the SGI 40 germanium ingot cutting wire saw on this page, running the same closed-loop endless-wire technology and the same DXF contour mode. One Vimfun engineer worked with Sunny's tooling team to convert their crescent drawing to a DXF, set kerf compensation, and run the first batch. The wire traced the crescent profile directly out of the Ge stock \u2014 kerf 0.4 mm along the contour, single-pass, no milling.<\/p>\n <div class=\"note\"><div class=\"t\">Outcomes Sunny Optical reported<\/div><p>After integrating the SGI machine into the crescent-lens line, Sunny reported a <span class=\"hl\">~30% production yield improvement<\/span> \u2014 chip rejects from the R-corner regions disappeared, and the same machine also handled their routine straight-slice and rod-extraction work in slice mode. Sunny has since scaled their Vimfun footprint to <span class=\"hl\">30+ machines<\/span> across multiple production sites, covering both contour work and routine slicing on the same platform.<\/p><\/div>\n <p>For full-size ingot work (\u00d8 185 mm class, longer ingots), the SGI 40 germanium ingot cutting wire saw is the right model for the same kind of unique-geometry job. The DXF mode, the closed-loop wire, the kerf compensation logic \u2014 all identical to the platform Sunny scaled on. Send us your part drawing and we'll convert it to DXF, run a sample contour cut on your supplied Ge blank, and ship back the part with a metrology report.<\/p>\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 full-size Ge ingots and free-form blanks<\/h2>\n <p>What the SGI 40 germanium ingot cutting wire saw commits to \u2014 the numbers that drive yield on a $30,000 ingot and unlock shapes traditional cutting can't make.<\/p>\n <\/div>\n <div class=\"hl-grid\">\n <div class=\"hl-card\"><div class=\"ic\"><svg viewBox=\"0 0 24 24\"><path d=\"M4 6h16M4 12h16M4 18h16\"\/><\/svg><\/div><div><div class=\"v\">DXF contour mode<\/div><div class=\"d\">Load a closed-polyline DXF, cut the shape directly from the ingot.<\/div><\/div><\/div>\n <div class=\"hl-card\"><div class=\"ic\"><svg viewBox=\"0 0 24 24\"><circle cx=\"12\" cy=\"12\" r=\"9\"\/><path d=\"M3 12h18\"\/><\/svg><\/div><div><div class=\"v\">\u00d8 185 \u00d7 L 400 mm<\/div><div class=\"d\">Full-size Ge ingot fits inside the enclosure \u2014 no pre-trimming.<\/div><\/div><\/div>\n <div class=\"hl-card\"><div class=\"ic\"><svg viewBox=\"0 0 24 24\"><path d=\"M4 14h6L13 7l3 10h4\"\/><\/svg><\/div><div><div class=\"v\">~0.5 mm kerf<\/div><div class=\"d\">Closed-loop endless wire, kerf near the wire diameter.<\/div><\/div><\/div>\n <div class=\"hl-card\"><div class=\"ic\"><svg viewBox=\"0 0 24 24\"><circle cx=\"12\" cy=\"12\" r=\"8\"\/><path d=\"M12 8v4l3 2\"\/><\/svg><\/div><div><div class=\"v\">\u00b10.01 mm Y\/Z<\/div><div class=\"d\">Servo linear stages \u2014 contour tolerance bounded by your DXF, not the machine.<\/div><\/div><\/div>\n <div class=\"hl-card\"><div class=\"ic\"><svg viewBox=\"0 0 24 24\"><path d=\"M3 7h18M3 12h18M3 17h18\"\/><\/svg><\/div><div><div class=\"v\">Multi-material<\/div><div class=\"d\">Ge, ZnSe, ZnS, silicon, sapphire, optical glass.<\/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 sample cut<\/div><div class=\"d\">Send a DXF and a Ge blank; we ship back the contour-cut part + report.<\/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>SGI 40 technical specifications<\/h2><\/div>\n <div>\n <p>Standard-configuration specs for the SGI 40 germanium ingot cutting wire saw. Worktable, travel, and contour-mode parameters configurable on request.<\/p>\n <table class=\"tbl datasheet\"><tbody>\n <tr><td>Workpiece size (ingot)<\/td><td>\u00d8 \u2264 185 mm \u00d7 L \u2264 400 mm<\/td><\/tr>\n <tr><td>Worktable size<\/td><td>400 \u00d7 400 mm<\/td><\/tr>\n <tr><td>Y \/ Z axis travel<\/td><td>400 mm \/ 400 mm<\/td><\/tr>\n <tr><td>Cutting modes<\/td><td>straight slicing \u00b7 DXF closed-contour cut<\/td><\/tr>\n <tr><td>DXF input<\/td><td>USB \u00b7 closed polylines & arcs \u00b7 kerf compensation programmable<\/td><\/tr>\n <tr><td>Diamond wire diameter<\/td><td>0.35\u20130.5 mm (Ge optimum)<\/td><\/tr>\n <tr><td>Kerf width<\/td><td>~0.5 mm (closed-loop endless wire)<\/td><\/tr>\n <tr><td>Max wire linear speed<\/td><td>52 m\/s<\/td><\/tr>\n <tr><td>Y \/ Z minimum feed<\/td><td>0.01 mm<\/td><\/tr>\n <tr><td>Y \/ Z repeatability<\/td><td>\u00b10.01 mm<\/td><\/tr>\n <tr><td>Cutting \/ manual speed<\/td><td>0\u20131000 mm\/min (adjustable)<\/td><\/tr>\n <tr><td>Guide wheels<\/td><td>2 \u00d7 \u00d8250 mm + 1 \u00d7 \u00d8180 mm (3-wheel path)<\/td><\/tr>\n <tr><td>Drive motor power<\/td><td>1.5 kW (max 4500 RPM)<\/td><\/tr>\n <tr><td>Power supply<\/td><td>220 V three-phase \u00b7 60 Hz<\/td><\/tr>\n <tr><td>Cooling<\/td><td>built-in coolant tank + circulation + mist recovery<\/td><\/tr>\n <tr><td>Cutting oil consumption (single shift)<\/td><td>~80 L \/ month<\/td><\/tr>\n <tr><td>Drawing standard<\/td><td>ISO 10110<\/td><\/tr>\n <tr><td>Warranty<\/td><td>1 year (parts + engineering support)<\/td><\/tr>\n <\/tbody><\/table>\n <p>Tolerances on the cut blank \u2014 kerf, edge chipping, contour deviation \u2014 flow into the centering and grinding stages per <a href=\"https:\/\/www.iso.org\/standard\/79655.html\" target=\"_blank\" rel=\"noopener noreferrer\">ISO 10110<\/a>.<\/p>\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>Which materials does the SGI 40 cut?<\/h2><\/div>\n <div>\n <p>The endless wire cuts anything softer than diamond, but the SGI 40 was built around full-size germanium ingot work \u2014 that's where the \u00d8 185 \u00d7 L 400 mm capacity and the DXF contour mode pay back first. Other brittle optics materials run on the same platform with their own parameter sets:<\/p>\n <ul class=\"clean\">\n <li><strong>Germanium (Ge)<\/strong> \u2014 primary material \u00b7 0.35\u20130.5 mm wire, 100\u2013140 N tension, white mineral oil coolant<\/li>\n <li><strong>Silicon (Si)<\/strong> \u2014 mature parameter set \u00b7 0.42\u20130.5 mm wire<\/li>\n <li><strong>Zinc selenide (ZnSe) & zinc sulfide (ZnS)<\/strong> \u2014 chalcogenide windows \u00b7 gentler infeed<\/li>\n <li><strong>Sapphire<\/strong> \u2014 0.5\u20130.65 mm wire, higher tension, slower feed<\/li>\n <li><strong>Optical glass (BK7 \/ K9) and fused quartz<\/strong> \u2014 same closed-loop wire, parameter set per glass family<\/li>\n <\/ul>\n <p>Cutting something not on the list \u2014 chalcogenide glass, exotic ceramic, layered composite? Send a sample and we'll test-cut it before quoting parameters. We don't guess on materials we haven't run.<\/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 SGI 40 fit in a Ge lens line?<\/h2><\/div>\n <div>\n <p>The SGI 40 germanium ingot cutting wire saw is the front end for any production that includes free-form Ge lens blanks alongside routine wafers. It takes ingots in (\u00d8 \u2264 185 \u00d7 L \u2264 400 mm) and outputs either straight-sliced wafers or DXF-defined contour blanks, in the same machine, on the same shift. Everything downstream \u2014 edge centering, spherical grinding, polishing, AR coating \u2014 flows from what this machine cuts.<\/p>\n <p>For the full chain \u2014 five-stage workflow from ingot to coated lens \u2014 see the <a href=\"https:\/\/www.opticalcutting.com\/germanium-lens-manufacturing\/\">germanium lens manufacturing<\/a> solution page. The broader 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 cutting machine<\/div><p>If your job is 100% round wafer slicing at production volume, the leaner <a href=\"https:\/\/www.opticalcutting.com\/germanium-wafer-slicing-machine\/\">SG40 germanium wafer slicing machine<\/a> covers it at lower CapEx \u2014 same kerf, no contour-mode capability you wouldn't use. If your job mixes round wafers with prism, square, or polygonal blanks (predefined geometric shapes via rotary indexing \u2014 not free-form curves), the <a href=\"https:\/\/www.opticalcutting.com\/germanium-lens-blank-cutting-machine\/\">SGR40 with rotary axis<\/a> covers that with the same closed-loop wire. The SGI 40's exclusive value is the DXF mode for shapes neither of the other two can make.<\/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 contour cut on your own Ge ingot<\/h2>\n <p>Pick the SGI 40 germanium ingot cutting wire saw if your production includes free-form Ge lens blanks that core drills and ID saws can't make \u2014 crescents, off-axis shapes, irregular polygons \u2014 and you still want a single machine that handles routine straight wafer slicing too. Send us your DXF and a Ge sample; we'll convert if needed, run the contour, and ship the cut part back with a metrology report before you commit.<\/p>\n <\/div>\n <div>\n <a class=\"btn\" href=\"mailto:daria@endlesswiresaw.com?subject=SGI%2040%20germanium%20ingot%20cutting%20wire%20saw%20\u2014%20sample%20contour%20cut%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 contour cut & 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":"<ul>\n<li class=\"font-claude-response-body 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