{"product_id":"the-fifth-ratio-cnc-rack-gearbox","title":"The Fifth Ratio | 5:1 CNC Rack Gearbox for 1.25M and 1.5M Pinions","description":"\u003cdiv class=\"product-narrative\"\u003e\n\u003cp\u003e\u003cstrong\u003ePrecision Is the Art of Removing Movement.\u003c\/strong\u003e A CNC machine does not lose accuracy in a dramatic way. It loses it one component at a time: a belt with a little give, a shaft a few hundredths off centre, a gearbox that hesitates before it turns. Each of those errors is small enough to be forgiven in isolation, and together they become a part that does not fit the drawing. The reduction stage between the servo and the rack is where a builder decides whether the machine will repeat itself for a decade or drift every month.\u003c\/p\u003e\n\u003cp\u003eThis unit is a 5:1 gearbox for rack-and-pinion axes, built in 1.25 module and 1.5 module tooth sizes with both straight and helical tooth profiles. Helical teeth carry load more smoothly and more quietly than straight teeth, which matters on a machine cutting continuously for hours. Direction is selectable, so left-hand and right-hand variants mate correctly with the rack you already have. Shaft length is offered in long and short versions, and the pinion pulley bore comes in 12.7mm or 14mm to suit the belt drive from the servo. The gearbox bore is 19mm, sized for 80-frame servo motors, and input speed is rated from 750 to 3000rpm. The housing is precision cast in iron rather than fabricated, which is how a small gearbox holds its centre distance without moving. Each unit ships with the matching belt and small pulley, so the reduction stage arrives as a complete set rather than a list of parts to source elsewhere.\u003c\/p\u003e\n\u003cp\u003eThe applications are the ones where the axis is long and the load is heavy: CNC routers and plasma tables driving a gantry along a rack, laser beds with a moving bridge, woodworking machines, stone and glass tables, and any machine with a travel beyond what a ballscrew can carry economically. Builders retrofitting a rack-and-pinion axis, machine shops keeping a spare reduction stage on the shelf, and workshops assembling a first machine all use the same part for the same reason: it removes movement from the axis.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eEvery hundredth of backlash is a mistake you will make a thousand times.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\u003chr style=\"margin: 20px 0; border: 0; border-top: 1px solid #eee;\"\u003e\u003cdiv class=\"product-features\"\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul style=\"list-style: none; padding: 0;\"\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e✦ 5:1 reduction ratio for rack-and-pinion machine axes\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e✦ Available in 1.25 module and 1.5 module tooth sizes\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e✦ Straight and helical tooth profiles, with left-hand and right-hand drive options\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e✦ Long and short shaft versions to match the mounting arrangement\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e✦ Pinion pulley bore of 12.7mm or 14mm for belt drive from the servo\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e✦ 19mm gearbox bore sized for 80-frame servo motors\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e✦ Input speed rated from 750 to 3000rpm\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e✦ Precision-cast iron housing, supplied with the matching belt and small pulley\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003chr style=\"margin: 20px 0; border: 0; border-top: 1px solid #eee;\"\u003e\u003cdiv class=\"product-specs\"\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul style=\"list-style: none; padding: 0;\"\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eReduction Ratio:\u003c\/strong\u003e 5:1\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eTooth Modules:\u003c\/strong\u003e 1.25 module and 1.5 module\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eTooth Profile:\u003c\/strong\u003e Straight teeth and helical teeth\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eDirection Options:\u003c\/strong\u003e Left-hand and right-hand variants\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eShaft Options:\u003c\/strong\u003e Long shaft and short shaft\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003ePulley Bore:\u003c\/strong\u003e 12.7mm or 14mm inner hole diameter\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eGearbox Bore:\u003c\/strong\u003e 19mm, suitable for 80-frame servo motors\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eInput Speed:\u003c\/strong\u003e 750 to 3000rpm\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eHousing Material:\u003c\/strong\u003e Precision-cast iron\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eIncluded:\u003c\/strong\u003e 1 gearbox in 1.25 module or 1.5 module, 1 belt, 1 small pulley\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eMotion Conversion:\u003c\/strong\u003e Rotary servo input to linear rack travel through the pinion\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eCertification:\u003c\/strong\u003e CE\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e HLTNC\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003chr style=\"margin: 20px 0; border: 0; border-top: 1px solid #eee;\"\u003e\u003cdiv class=\"product-applications\"\u003e\n\u003ch3\u003eWhere It Belongs\u003c\/h3\u003e\n\u003cp\u003eThis gearbox belongs on every long-travel axis of a CNC machine. Router gantries driven along a rack, plasma and oxy-fuel cutting tables, laser beds with a moving bridge, woodworking and panel-processing machines, stone and glass tables, and retrofit projects where a ballscrew would be uneconomical over the required length. It also suits automation builders constructing a rail-mounted gantry for material handling, and machine shops that keep a spare reduction stage on the shelf so an unplanned failure does not stop the spindle for a week. Wherever a rack runs the length of a machine, this is the part that couples the servo to it.\u003c\/p\u003e\n\u003c\/div\u003e\u003chr style=\"margin: 20px 0; border: 0; border-top: 1px solid #eee;\"\u003e\u003cdiv class=\"product-faq\"\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdiv style=\"margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I choose between 1.25M and 1.5M?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMatch the module to the rack already on the machine. The 1.25 module and 1.5 module pinions are not interchangeable, so the rack tooth size decides it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Should I choose straight or helical teeth?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eHelical teeth are smoother and quieter under continuous load, while straight teeth are simpler and common on older or lighter machines. Either profile is available in the stocked configurations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Which pulley bore do I need?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe pulley comes with a 12.7mm or 14mm inner bore, so choose the one that matches your servo shaft and belt drive arrangement. The gearbox itself has a 19mm bore sized for 80-frame servo motors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What comes in the box?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOne gearbox in your chosen module, one matching belt, and one small pulley. That gives you the complete reduction stage between servo and pinion.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What input speed can it take?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe unit is rated for input speeds of 750 to 3000rpm, which covers the servo and stepper drive ranges used on router and table axes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I mount the pinion to the rack?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMesh the pinion to the rack at the correct tooth module, tension the supplied belt between the servo pulley and the gearbox input pulley, and set backlash with the gearbox mounting slots before locking the fasteners.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003chr style=\"margin: 20px 0; border: 0; border-top: 1px solid #eee;\"\u003e\u003cdiv class=\"product-promise\" style=\"background: #fafafa; padding: 18px 20px; border-left: 3px solid #1a1a2e;\"\u003e\n\u003ch3 style=\"margin-top: 0;\"\u003eThe EastSupplier Promise\u003c\/h3\u003e\n\u003cp\u003eEvery unit is inspected before it leaves the warehouse. If a specification on this page does not match what arrives, we cover the return shipping and replace it. English-language support answers within one business day, and replacement parts for this category are stocked so that a working unit stays working.\u003c\/p\u003e\n\u003c\/div\u003e\u003cdiv class=\"product-gallery\" style=\"margin-top: 30px; text-align: center;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S1a95227c5d2f4188b53f9d2bfc9a80c9X.webp?v=1712880847\" alt=\"The Fifth Ratio\" style=\"max-width: 100%; height: auto; margin: 8px 0; border-radius: 6px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Hf09a1e7e308c45509ad4ea3cbcf415a2A.webp?v=1712880847\" alt=\"The Fifth Ratio\" style=\"max-width: 100%; height: auto; margin: 8px 0; border-radius: 6px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Hde2c06b6e0f14522ba069abc758cf2f9r.webp?v=1712880847\" alt=\"The Fifth Ratio\" style=\"max-width: 100%; height: auto; margin: 8px 0; border-radius: 6px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/H4b4a5fdc7f0c42da922f53200c0537cap.webp?v=1712880847\" alt=\"The Fifth Ratio\" style=\"max-width: 100%; height: auto; margin: 8px 0; border-radius: 6px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Se2d6740308b24902bd4945a9e8d177ceO.webp?v=1712880848\" alt=\"The Fifth Ratio\" style=\"max-width: 100%; height: auto; margin: 8px 0; border-radius: 6px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S8a80fb810d0249efa274bebc316dd503O.webp?v=1712880847\" alt=\"The Fifth Ratio\" style=\"max-width: 100%; height: auto; margin: 8px 0; border-radius: 6px;\"\u003e\n\u003c\/div\u003e\u003cscript type=\"application\/ld+json\"\u003e\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"Product\",\"name\":\"The Fifth Ratio | 5:1 CNC Rack Gearbox for 1.25M and 1.5M Pinions\",\"brand\":{\"@type\":\"Brand\",\"name\":\"EastSupplier\"},\"description\":\"A 5:1 reduction gearbox for CNC rack-and-pinion axes, available in 1.25M and 1.5M modules with straight or helical teeth, left or right hand drive, and 12.7mm or 14mm pulley bores.\",\"image\":[\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S1a95227c5d2f4188b53f9d2bfc9a80c9X.webp?v=1712880847\"],\"sku\":\"CNC Components\",\"offers\":{\"@type\":\"AggregateOffer\",\"priceCurrency\":\"USD\",\"lowPrice\":\"177.4\",\"highPrice\":\"181.67\",\"offerCount\":16,\"availability\":\"https:\/\/schema.org\/InStock\",\"url\":\"https:\/\/eastsupplier.com\/products\/the-fifth-ratio-cnc-rack-gearbox\"},\"aggregateRating\":{\"@type\":\"AggregateRating\",\"ratingValue\":\"4.75\",\"reviewCount\":\"4\"}}\n\u003c\/script\u003e","brand":"East Supplier Platform","offers":[{"title":"12.7mm \/ 1.5M straight short \/ CHINA","offer_id":45331362218207,"sku":"4000232951024-12.7mm-1.5M straight short-CHINA","price":180.16,"currency_code":"USD","in_stock":true},{"title":"14mm \/ 1.25M straight long \/ CHINA","offer_id":45331362250975,"sku":"4000232951024-14mm-1.25M straight long-CHINA","price":177.4,"currency_code":"USD","in_stock":true},{"title":"14mm \/ 1.25M straight short \/ CHINA","offer_id":45331362283743,"sku":"4000232951024-14mm-1.25M straight short-CHINA","price":177.4,"currency_code":"USD","in_stock":true},{"title":"14mm \/ 1.5M left short \/ CHINA","offer_id":45331362316511,"sku":"4000232951024-14mm-1.5M left short-CHINA","price":180.16,"currency_code":"USD","in_stock":true},{"title":"12.7mm \/ 1.5M left long \/ CHINA","offer_id":45331362349279,"sku":"4000232951024-12.7mm-1.5M left long-CHINA","price":177.4,"currency_code":"USD","in_stock":true},{"title":"12.7mm \/ 1.25M left  long \/ CHINA","offer_id":45331362382047,"sku":"4000232951024-12.7mm-1.25M left  long-CHINA","price":177.4,"currency_code":"USD","in_stock":true},{"title":"12.7mm \/ 1.25M left  short \/ CHINA","offer_id":45331362414815,"sku":"4000232951024-12.7mm-1.25M left  short-CHINA","price":177.4,"currency_code":"USD","in_stock":true},{"title":"12.7mm \/ 1.25M straight long \/ CHINA","offer_id":45331362447583,"sku":"4000232951024-12.7mm-1.25M straight long-CHINA","price":177.4,"currency_code":"USD","in_stock":true},{"title":"12.7mm \/ 1.5M straight long \/ CHINA","offer_id":45331362480351,"sku":"4000232951024-12.7mm-1.5M straight long-CHINA","price":180.16,"currency_code":"USD","in_stock":true},{"title":"12.7mm \/ 1.25M straight short \/ CHINA","offer_id":45331362513119,"sku":"4000232951024-12.7mm-1.25M straight short-CHINA","price":177.4,"currency_code":"USD","in_stock":true},{"title":"12.7mm \/ 1.5M left short \/ CHINA","offer_id":45331362545887,"sku":"4000232951024-12.7mm-1.5M left short-CHINA","price":180.16,"currency_code":"USD","in_stock":true},{"title":"14mm \/ 1.5M straight long \/ CHINA","offer_id":45331362578655,"sku":"4000232951024-14mm-1.5M straight long-CHINA","price":181.67,"currency_code":"USD","in_stock":true},{"title":"14mm \/ 1.5M straight short \/ CHINA","offer_id":45331362873567,"sku":"4000232951024-14mm-1.5M straight short-CHINA","price":180.16,"currency_code":"USD","in_stock":true},{"title":"14mm \/ 1.5M left long \/ CHINA","offer_id":45331362906335,"sku":"4000232951024-14mm-1.5M left long-CHINA","price":180.16,"currency_code":"USD","in_stock":true},{"title":"14mm \/ 1.25M left  long \/ CHINA","offer_id":45331362939103,"sku":"4000232951024-14mm-1.25M left  long-CHINA","price":177.4,"currency_code":"USD","in_stock":true},{"title":"14mm \/ 1.25M left  short \/ CHINA","offer_id":45331362971871,"sku":"4000232951024-14mm-1.25M left  short-CHINA","price":177.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S1a95227c5d2f4188b53f9d2bfc9a80c9X.webp?v=1712880847","url":"https:\/\/eastsupplier.com\/fr\/products\/the-fifth-ratio-cnc-rack-gearbox","provider":"EastSupplier Platform","version":"1.0","type":"link"}