Rack fixing methods: welding vs. bolting vs. bracketing<\/title>\n\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=Inter:wght@400;500;600;700&display=swap\" rel=\"stylesheet\">\n\n <style>\n *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }\n\n :root {\n --green: #1a6b3c;\n --green-dark: #0f4a28;\n --green-mid: #2d8a55;\n --green-light: #e8f4ed;\n --green-xlight: #f2faf5;\n --amber: #b45309;\n --amber-light: #fef3c7;\n\n --bg: #ffffff;\n --bg-soft: #f8f9fa;\n --bg-muted: #f1f3f5;\n --border: #e5e7eb;\n --border-mid: #d1d5db;\n\n --text-primary: #111827;\n --text-secondary: #4b5563;\n --text-muted: #9ca3af;\n\n --radius-sm: 6px;\n --radius-md: 8px;\n --radius-lg: 12px;\n --shadow-sm: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);\n --shadow-md: 0 4px 12px rgba(0,0,0,.08), 0 2px 4px rgba(0,0,0,.04);\n }\n\n body { min-height: 100vh; 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}\n .infobox--grey .infobox__text { color: var(--text-secondary); }\n\n .warnbox {\n background: var(--amber-light);\n border-left: 3px solid var(--amber);\n border-radius: 0 var(--radius-md) var(--radius-md) 0;\n padding: 12px 16px;\n margin: 16px 0;\n }\n\n .warnbox__title {\n display: flex;\n align-items: center;\n gap: 6px;\n font-size: 13px;\n font-weight: 600;\n color: #92400e;\n margin-bottom: 5px;\n }\n\n .warnbox__text {\n font-size: 13.5px;\n color: var(--amber);\n line-height: 1.65;\n }\n\n \/* ============================================================\n IMAGE\n ============================================================ *\/\n .article__figure {\n margin: 20px 0;\n text-align: center;\n }\n\n .article__figure img {\n max-width: 100%;\n }\n\n .article__figure figcaption {\n font-size: 13px;\n color: var(--text-muted);\n margin-top: 8px;\n }\n\n \/* ============================================================\n TABLE\n ============================================================ *\/\n .article__table-wrap {\n overflow-x: auto;\n margin: 16px 0;\n border-radius: var(--radius-md);\n border: 1px solid var(--border);\n }\n\n .article__table {\n width: 100%;\n border-collapse: collapse;\n font-size: 14px;\n }\n\n .article__table thead {\n background: var(--green);\n }\n\n .article__table th {\n text-align: left;\n font-weight: 600;\n color: #ffffff;\n padding: 10px 14px;\n border-bottom: 1px solid var(--border);\n white-space: nowrap;\n }\n\n .article__table td {\n padding: 10px 14px;\n color: var(--text-secondary);\n border-bottom: 1px solid var(--border);\n line-height: 1.6;\n vertical-align: top;\n }\n\n .article__table tr:last-child td { border-bottom: none; }\n\n .badge {\n display: inline-block;\n font-size: 12px;\n font-weight: 600;\n padding: 2px 8px;\n border-radius: 20px;\n background: var(--green-light);\n color: var(--green-dark);\n }\n\n \/* ============================================================\n RESPONSIVE\n ============================================================ *\/\n @media (max-width: 900px) {\n .article-body { flex-direction: column; padding: 20px 20px 48px; }\n }\n \n \/* Glossary tooltips *\/\n .glossary-term {\n border-bottom: 1px dotted var(--green);\n color: var(--green);\n font-style: italic;\n cursor: help;\n }\n .glossary-tooltip {\n position: fixed;\n z-index: 9999;\n background: #fff;\n border: 1px solid var(--border-mid);\n border-radius: var(--radius-md);\n box-shadow: var(--shadow-md);\n padding: 10px 14px;\n max-width: 300px;\n font-family: 'Inter', sans-serif;\n font-size: 13px;\n }\n .glossary-tooltip__title {\n font-weight: 600;\n color: var(--text-primary);\n margin-bottom: 4px;\n }\n .glossary-tooltip__def {\n font-size: 12.5px;\n color: var(--text-secondary);\n line-height: 1.6;\n }\n .glossary-tooltip__tag {\n display: inline-block;\n margin-top: 6px;\n font-size: 9px;\n font-weight: 600;\n padding: 2px 7px;\n border-radius: 20px;\n background: var(--green-light);\n color: var(--green-dark);\n text-transform: uppercase;\n letter-spacing: 0.04em;\n }\n\n <\/style>\n<\/head>\n<body>\n\n<div id=\"tt-gioco-di-flanchi-backlash\" class=\"glossary-tooltip\" hidden=\"\">\n <div class=\"glossary-tooltip__title\">Backlash<\/div>\n <div class=\"glossary-tooltip__def\">Free clearance between the flanks of two mating teeth, measured at the pitch circle. It prevents jamming due to thermal expansion or assembly errors.<\/div>\n <span class=\"glossary-tooltip__tag\">Glossary<\/span>\n<\/div>\n<div id=\"tt-angolo-di-pressione\" class=\"glossary-tooltip\" hidden=\"\">\n <div class=\"glossary-tooltip__title\">Pressure angle<\/div>\n <div class=\"glossary-tooltip__def\">Angle between the direction of the contact force between mating teeth and the tangent to the pitch circle at the point of contact. The standard value is 20\u00b0.<\/div>\n <span class=\"glossary-tooltip__tag\">Glossary<\/span>\n<\/div>\n<div id=\"tt-diametro-primitivo\" class=\"glossary-tooltip\" hidden=\"\">\n <div class=\"glossary-tooltip__title\">Pitch diameter<\/div>\n <div class=\"glossary-tooltip__def\">Diameter of the theoretical circle at which contact occurs between two meshing gears. Obtained from the product of the module and the number of teeth.<\/div>\n <span class=\"glossary-tooltip__tag\">Glossary<\/span>\n<\/div>\n\n <div class=\"article-page\">\n <div class=\"article-body\">\n <div class=\"article-body__main\"><script type=\"application\/ld+json\">\n{\n \"@context\": \"https:\/\/schema.org\",\n \"@graph\": [\n {\n \"@type\": \"TechArticle\",\n \"@id\": \"#article\",\n \"headline\": \"Rack fixing methods: welding vs. bolting vs. bracketing\",\n \"description\": \"The rack transmits forces, not just motion. Every tooth that meshes discharges a tangential component and a radial one onto the fixing. 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It prevents jamming due to thermal expansion or assembly errors.\",\n \"inDefinedTermSet\": \"#glossario\"\n },\n {\n \"@type\": \"DefinedTerm\",\n \"@id\": \"#term-angolo-di-pressione\",\n \"name\": \"Pressure angle\",\n \"description\": \"Angle between the direction of the contact force between mating teeth and the tangent to the pitch circle at the point of contact. The standard value is 20\u00b0.\",\n \"inDefinedTermSet\": \"#glossario\"\n },\n {\n \"@type\": \"DefinedTerm\",\n \"@id\": \"#term-diametro-primitivo\",\n \"name\": \"Pitch diameter\",\n \"description\": \"Diameter of the theoretical circle at which contact occurs between two meshing gears. Obtained from the product of the module and the number of teeth.\",\n \"inDefinedTermSet\": \"#glossario\"\n }\n ]\n }\n ]\n}\n<\/script>\n\n\n\n <h1 class=\"article__title\">Rack fixing methods: welding vs. bolting vs. bracketing<\/h1>\n<p class=\"article__subtitle\">The rack transmits forces, not just motion. Every tooth that meshes discharges a tangential component and a radial one onto the fixing. Choosing the wrong method doesn’t produce an immediate failure: it produces vibration, progressive <dfn id=\"def-gioco-di-flanchi-backlash\"><span class=\"glossary-term\" data-tooltip=\"tt-gioco-di-flanchi-backlash\" title=\"Free clearance between the flanks of two mating teeth, measured at the pitch circle. It prevents jamming due to thermal expansion or assembly errors.\">backlash<\/span><\/dfn> and early wear that shows up weeks after installation.<\/p>\n<h2 class=\"article__h2\" id=\"the-methods-compared\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><rect x=\"3\" y=\"3\" width=\"8\" height=\"18\" rx=\"1\"><\/rect><rect x=\"13\" y=\"3\" width=\"8\" height=\"18\" rx=\"1\"><\/rect><\/svg><\/span>\n The methods compared\n<\/h2>\n<p class=\"article__p\">The rack converts the rotary motion of the motor into linear displacement of the supporting structure. The fixing must withstand this conversion over time, under all load conditions.<\/p>\n<p class=\"article__p\">For nylon racks and nylon racks with a steel core, the main methods are <strong>bolting<\/strong> and <strong>bracketing<\/strong>. The choice depends on how the force transfers from the pinion, on the number of fixing points, on the length and thickness of the profile, and on the ability to intervene for maintenance.<\/p>\n<div class=\"article__table-wrap\">\n<table class=\"article__table\">\n<thead><tr><th>Method<\/th><th>Resistance to forces<\/th><th>Assembly and precision<\/th><th>Costs and maintenance<\/th><th>Preferential use<\/th><\/tr><\/thead>\n<tbody><tr><td>Bolting<\/td><td>Good if screws and holes are correctly sized<\/td><td>Adjustable with measuring instruments<\/td><td>Medium cost, simple maintenance<\/td><td>Automation with adjustment and replacement<\/td><\/tr>\n<tr><td>Bracketing<\/td><td>Medium, depends on the spacing between brackets<\/td><td>Fast, less precise if brackets are elastic<\/td><td>Contained cost, attention to loosening<\/td><td>Light structures, temporary installations<\/td><\/tr><\/tbody>\n<\/table>\n<\/div>\n<h2 class=\"article__h2\" id=\"reaction-forces-and-pressure-angle\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><polygon points=\"13 2 3 14 12 14 11 22 21 10 12 10 13 2\"><\/polygon><\/svg><\/span>\n Reaction forces and pressure angle\n<\/h2>\n<p class=\"article__p\">The pinion meshes with the rack generating two forces: a tangential one, which moves the supporting structure, and a radial one, which pushes or pulls the components away from the fixing point. It’s this second force that often determines the durability of the fixing over time.<\/p>\n<p class=\"article__p\">With a 20\u00b0 <strong><dfn id=\"def-angolo-di-pressione\"><span class=\"glossary-term\" data-tooltip=\"tt-angolo-di-pressione\" title=\"Angle between the direction of the contact force between mating teeth and the tangent to the pitch circle at the point of contact. The standard value is 20\u00b0.\">pressure angle<\/span><\/dfn><\/strong>, the radial force is about <strong>36%<\/strong> of the tangential force. A tangential force of 1000 N generates about 364 N of radial force. Screws, brackets or welds must resist both tension and transverse thrust.<\/p>\n<p class=\"article__p\">The tangential force is calculated from the motor torque and the pinion diameter:<\/p>\n<h2 class=\"article__h2\" id=\"ft-2t-d\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M14.7 6.3a1 1 0 0 0 0 1.4l1.6 1.6a1 1 0 0 0 1.4 0l3.77-3.77a6 6 0 0 1-7.94 7.94l-6.91 6.91a2.12 2.12 0 0 1-3-3l6.91-6.91a6 6 0 0 1 7.94-7.94l-3.76 3.76z\"><\/path><\/svg><\/span>\n Ft = 2T \/ d\n<\/h2>\n<p class=\"article__p\">Where T is the torque and d the <strong><dfn id=\"def-diametro-primitivo\"><span class=\"glossary-term\" data-tooltip=\"tt-diametro-primitivo\" title=\"Diameter of the theoretical circle at which contact occurs between two meshing gears. Obtained from the product of the module and the number of teeth.\">pitch diameter<\/span><\/dfn><\/strong> of the pinion. Smaller pinions increase the transmitted force and the stresses on the fixing.<\/p>\n<h2 class=\"article__h2\" id=\"bolting\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><circle cx=\"12\" cy=\"5\" r=\"1\"><\/circle><circle cx=\"19\" cy=\"5\" r=\"1\"><\/circle><circle cx=\"5\" cy=\"5\" r=\"1\"><\/circle><circle cx=\"12\" cy=\"12\" r=\"1\"><\/circle><circle cx=\"19\" cy=\"12\" r=\"1\"><\/circle><circle cx=\"5\" cy=\"12\" r=\"1\"><\/circle><circle cx=\"12\" cy=\"19\" r=\"1\"><\/circle><circle cx=\"19\" cy=\"19\" r=\"1\"><\/circle><circle cx=\"5\" cy=\"19\" r=\"1\"><\/circle><\/svg><\/span>\n Bolting\n<\/h2>\n<p class=\"article__p\">The most versatile choice: it allows fixing, adjustment, pitch correction and replacement of sections without disassembling everything. You need a drill, level, pencil, measuring tape, screwdriver or driver, screws and suitable anchors.<\/p>\n<p class=\"article__p\">For wall supports, the type of anchor depends on the load and the wall structure: for hollow walls <strong>toggle anchors<\/strong> are used, for solid masonry and heavy loads <strong>certified-quality nylon anchors<\/strong>.<\/p>\n<h2 class=\"article__h2\" id=\"bracketing\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M14 14.76V3.5a2.5 2.5 0 0 0-5 0v11.26a4.5 4.5 0 1 0 5 0z\"><\/path><\/svg><\/span>\n Bracketing\n<\/h2>\n<p class=\"article__p\">Useful when you can’t work along the entire base of the supporting structure, or when a fast assembly is needed. The brackets distribute the load over several points, but the spacing between them is decisive.<\/p>\n<div class=\"infobox infobox--grey\">\n <div class=\"infobox__title\">\n <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M14.7 6.3a1 1 0 0 0 0 1.4l1.6 1.6a1 1 0 0 0 1.4 0l3.77-3.77a6 6 0 0 1-7.94 7.94l-6.91 6.91a2.12 2.12 0 0 1-3-3l6.91-6.91a6 6 0 0 1 7.94-7.94l-3.76 3.76z\"><\/path><\/svg>\n Technical note\n <\/div>\n <p class=\"infobox__text\">Brackets too far apart cause local bending of the rack, vibration, irregular wear and loss of contact with the pinion. Calculate the bracket spacing based on the radial force and the allowable bending for the chosen profile.<\/p>\n<\/div>\n<h2 class=\"article__h2\" id=\"thermal-expansion-and-joints-between-sections\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><rect x=\"8\" y=\"2\" width=\"8\" height=\"4\" rx=\"1\" ry=\"1\"><\/rect><path d=\"M16 4h2a2 2 0 0 1 2 2v14a2 2 0 0 1-2 2H6a2 2 0 0 1-2-2V6a2 2 0 0 1 2-2h2\"><\/path><line x1=\"12\" y1=\"11\" x2=\"16\" y2=\"11\"><\/line><line x1=\"12\" y1=\"16\" x2=\"16\" y2=\"16\"><\/line><line x1=\"8\" y1=\"11\" x2=\"8.01\" y2=\"11\"><\/line><line x1=\"8\" y1=\"16\" x2=\"8.01\" y2=\"16\"><\/line><\/svg><\/span>\n Thermal expansion and joints between sections\n<\/h2>\n<p class=\"article__p\">Nylon racks have a <strong>thermal expansion coefficient<\/strong> of about 80-100 \u00d7 10\u207b\u2076 \/\u00b0C. On 1 meter with a variation of 50 \u00b0C, the elongation is about 4.5 mm: enough to change the backlash with the pinion, with a consequent increase in friction and wear.<\/p>\n<p class=\"article__p\">To manage expansion, provide one fixed point and other points that allow longitudinal sliding. Not every fixing point has to be rigid. Slotted holes, assembly clearances, wide washers and controlled joints allow expansion without excessive stress.<\/p>\n<p class=\"article__p\">The joints between sections can be made with plates, male-female inserts or overlaps. Maintain pitch continuity from one section to the next: any discontinuity becomes a mechanical obstacle to the passage of the pinion.<\/p>\n<div class=\"warnbox\">\n <div class=\"warnbox__title\">\n <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M10.29 3.86L1.82 18a2 2 0 0 0 1.71 3h16.94a2 2 0 0 0 1.71-3L13.71 3.86a2 2 0 0 0-3.42 0z\"><\/path><line x1=\"12\" y1=\"9\" x2=\"12\" y2=\"13\"><\/line><line x1=\"12\" y1=\"17\" x2=\"12.01\" y2=\"17\"><\/line><\/svg>\n Warning\n <\/div>\n <p class=\"warnbox__text\">In nylon with a steel core, the differential expansion between plastic and metal can create internal stress on long runs or with strong thermal swings. Avoid excessive constraints and leave sliding margin at the non-fixed points.<\/p>\n<\/div>\n<h2 class=\"article__h2\" id=\"assembly-notes\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><circle cx=\"12\" cy=\"12\" r=\"10\"><\/circle><\/svg><\/span>\n Assembly notes\n<\/h2>\n<p class=\"article__p\">Make sure the supporting structure is completely mounted and secured before proceeding with the rack, in compliance with <strong>UNI EN 13241:2016<\/strong>. Use a measuring tape, level, drill and screwdriver to guarantee precision and alignment.<\/p>\n<h2 class=\"article__h2\" id=\"operating-checklist\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><circle cx=\"12\" cy=\"12\" r=\"10\"><\/circle><\/svg><\/span>\n Operating checklist\n<\/h2>\n<ol class=\"article__list\">\n <li><strong>Verify<\/strong> motor torque, pinion diameter and tangential force.<\/li>\n <li><strong>Calculate<\/strong> the radial force from the pressure angle (20\u00b0).<\/li>\n <li><strong>Define<\/strong> the number and position of the fixing points.<\/li>\n <li><strong>Use<\/strong> a level, tape and pencil before drilling.<\/li>\n <li><strong>Drill<\/strong> the holes with the correct bit for the support material.<\/li>\n <li><strong>Choose<\/strong> screws, anchors, inserts or brackets based on the calculated load.<\/li>\n <li><strong>Leave<\/strong> clearance for thermal expansion.<\/li>\n <li><strong>Check<\/strong> the pitch between sections before commissioning.<\/li>\n <li><strong>Verify<\/strong> manually the sliding before powering the motor and control unit.<\/li>\n <li><strong>Check<\/strong> the absence of obstacles along the entire travel.<\/li>\n<\/ol>\n<p class=\"article__p\">For configurations with off-standard loads, long runs or particular thermal conditions, <a href=\"https:\/\/shop.stagnoligears.com\/en\/contacts\/\" target=\"_blank\" rel=\"noopener\" class=\"cta-link\">write<\/a> to us at the technical office: we verify the fixing method and the sizing of the critical points together.<\/p>\n\n <\/div>\n <\/div>\n <\/div>\n\n\n<script>\n (function () {\n var hideTimers = {};\n function positionTooltip(trigger, tooltip) {\n var margin = 8;\n tooltip.style.visibility = 'hidden';\n tooltip.style.top = '-9999px';\n tooltip.style.left = 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stresses and vibrations.<\/p>\n","protected":false},"parent":0,"template":"","meta":{"_acf_changed":false},"campo-applicazione":[5457],"categoria-ct":[5446],"class_list":["post-25607","centro-tecnico","type-centro-tecnico","status-publish","hentry","campo-applicazione-assembly","categoria-ct-racks-and-matching-pinions"],"acf":[],"yoast_head":"\n<title>Rack Fixing Methods: Bolting or Bracketing | Stagnoli Gears Shop<\/title>\n<meta name=\"description\" content=\"Compare rack fixing methods such as bolting and bracketing, and learn how forces, precision, maintenance and installation affect rack performance.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/shop.stagnoligears.com\/en\/technical-hub\/rack-fixing-methods-welding-vs-bolting-vs-bracketing\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta 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{"id":25607,"date":"2026-06-30T11:42:37","date_gmt":"2026-06-30T09:42:37","guid":{"rendered":"https:\/\/shop.stagnoligears.com\/?post_type=centro-tecnico&p=25607"},"modified":"2026-07-10T13:54:40","modified_gmt":"2026-07-10T11:54:40","slug":"rack-fixing-methods-welding-vs-bolting-vs-bracketing","status":"publish","type":"centro-tecnico","link":"https:\/\/shop.stagnoligears.com\/en\/technical-hub\/rack-fixing-methods-welding-vs-bolting-vs-bracketing\/","title":{"rendered":"Rack fixing methods: welding vs. bolting vs. bracketing"},"content":{"rendered":"\n\n \n \n \n Rack fixing methods: welding vs. bolting vs. bracketing<\/title>\n\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=Inter:wght@400;500;600;700&display=swap\" rel=\"stylesheet\">\n\n <style>\n *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }\n\n :root {\n --green: #1a6b3c;\n --green-dark: #0f4a28;\n --green-mid: #2d8a55;\n --green-light: #e8f4ed;\n --green-xlight: #f2faf5;\n --amber: #b45309;\n --amber-light: #fef3c7;\n\n --bg: #ffffff;\n --bg-soft: #f8f9fa;\n --bg-muted: #f1f3f5;\n --border: #e5e7eb;\n --border-mid: #d1d5db;\n\n --text-primary: #111827;\n --text-secondary: #4b5563;\n --text-muted: #9ca3af;\n\n --radius-sm: 6px;\n --radius-md: 8px;\n --radius-lg: 12px;\n --shadow-sm: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);\n --shadow-md: 0 4px 12px rgba(0,0,0,.08), 0 2px 4px rgba(0,0,0,.04);\n }\n\n body { min-height: 100vh; 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}\n\n .badge {\n display: inline-block;\n font-size: 12px;\n font-weight: 600;\n padding: 2px 8px;\n border-radius: 20px;\n background: var(--green-light);\n color: var(--green-dark);\n }\n\n \/* ============================================================\n RESPONSIVE\n ============================================================ *\/\n @media (max-width: 900px) {\n .article-body { flex-direction: column; padding: 20px 20px 48px; }\n }\n \n \/* Glossary tooltips *\/\n .glossary-term {\n border-bottom: 1px dotted var(--green);\n color: var(--green);\n font-style: italic;\n cursor: help;\n }\n .glossary-tooltip {\n position: fixed;\n z-index: 9999;\n background: #fff;\n border: 1px solid var(--border-mid);\n border-radius: var(--radius-md);\n box-shadow: var(--shadow-md);\n padding: 10px 14px;\n max-width: 300px;\n font-family: 'Inter', sans-serif;\n font-size: 13px;\n }\n .glossary-tooltip__title {\n font-weight: 600;\n color: var(--text-primary);\n margin-bottom: 4px;\n }\n .glossary-tooltip__def {\n font-size: 12.5px;\n color: var(--text-secondary);\n line-height: 1.6;\n }\n .glossary-tooltip__tag {\n display: inline-block;\n margin-top: 6px;\n font-size: 9px;\n font-weight: 600;\n padding: 2px 7px;\n border-radius: 20px;\n background: var(--green-light);\n color: var(--green-dark);\n text-transform: uppercase;\n letter-spacing: 0.04em;\n }\n\n <\/style>\n<\/head>\n<body>\n\n<div id=\"tt-gioco-di-flanchi-backlash\" class=\"glossary-tooltip\" hidden=\"\">\n <div class=\"glossary-tooltip__title\">Backlash<\/div>\n <div class=\"glossary-tooltip__def\">Free clearance between the flanks of two mating teeth, measured at the pitch circle. It prevents jamming due to thermal expansion or assembly errors.<\/div>\n <span class=\"glossary-tooltip__tag\">Glossary<\/span>\n<\/div>\n<div id=\"tt-angolo-di-pressione\" class=\"glossary-tooltip\" hidden=\"\">\n <div class=\"glossary-tooltip__title\">Pressure angle<\/div>\n <div class=\"glossary-tooltip__def\">Angle between the direction of the contact force between mating teeth and the tangent to the pitch circle at the point of contact. The standard value is 20\u00b0.<\/div>\n <span class=\"glossary-tooltip__tag\">Glossary<\/span>\n<\/div>\n<div id=\"tt-diametro-primitivo\" class=\"glossary-tooltip\" hidden=\"\">\n <div class=\"glossary-tooltip__title\">Pitch diameter<\/div>\n <div class=\"glossary-tooltip__def\">Diameter of the theoretical circle at which contact occurs between two meshing gears. Obtained from the product of the module and the number of teeth.<\/div>\n <span class=\"glossary-tooltip__tag\">Glossary<\/span>\n<\/div>\n\n <div class=\"article-page\">\n <div class=\"article-body\">\n <div class=\"article-body__main\"><script type=\"application\/ld+json\">\n{\n \"@context\": \"https:\/\/schema.org\",\n \"@graph\": [\n {\n \"@type\": \"TechArticle\",\n \"@id\": \"#article\",\n \"headline\": \"Rack fixing methods: welding vs. bolting vs. bracketing\",\n \"description\": \"The rack transmits forces, not just motion. Every tooth that meshes discharges a tangential component and a radial one onto the fixing. 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Every tooth that meshes discharges a tangential component and a radial one onto the fixing. Choosing the wrong method doesn’t produce an immediate failure: it produces vibration, progressive <dfn id=\"def-gioco-di-flanchi-backlash\"><span class=\"glossary-term\" data-tooltip=\"tt-gioco-di-flanchi-backlash\" title=\"Free clearance between the flanks of two mating teeth, measured at the pitch circle. It prevents jamming due to thermal expansion or assembly errors.\">backlash<\/span><\/dfn> and early wear that shows up weeks after installation.<\/p>\n<h2 class=\"article__h2\" id=\"the-methods-compared\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><rect x=\"3\" y=\"3\" width=\"8\" height=\"18\" rx=\"1\"><\/rect><rect x=\"13\" y=\"3\" width=\"8\" height=\"18\" rx=\"1\"><\/rect><\/svg><\/span>\n The methods compared\n<\/h2>\n<p class=\"article__p\">The rack converts the rotary motion of the motor into linear displacement of the supporting structure. The fixing must withstand this conversion over time, under all load conditions.<\/p>\n<p class=\"article__p\">For nylon racks and nylon racks with a steel core, the main methods are <strong>bolting<\/strong> and <strong>bracketing<\/strong>. The choice depends on how the force transfers from the pinion, on the number of fixing points, on the length and thickness of the profile, and on the ability to intervene for maintenance.<\/p>\n<div class=\"article__table-wrap\">\n<table class=\"article__table\">\n<thead><tr><th>Method<\/th><th>Resistance to forces<\/th><th>Assembly and precision<\/th><th>Costs and maintenance<\/th><th>Preferential use<\/th><\/tr><\/thead>\n<tbody><tr><td>Bolting<\/td><td>Good if screws and holes are correctly sized<\/td><td>Adjustable with measuring instruments<\/td><td>Medium cost, simple maintenance<\/td><td>Automation with adjustment and replacement<\/td><\/tr>\n<tr><td>Bracketing<\/td><td>Medium, depends on the spacing between brackets<\/td><td>Fast, less precise if brackets are elastic<\/td><td>Contained cost, attention to loosening<\/td><td>Light structures, temporary installations<\/td><\/tr><\/tbody>\n<\/table>\n<\/div>\n<h2 class=\"article__h2\" id=\"reaction-forces-and-pressure-angle\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><polygon points=\"13 2 3 14 12 14 11 22 21 10 12 10 13 2\"><\/polygon><\/svg><\/span>\n Reaction forces and pressure angle\n<\/h2>\n<p class=\"article__p\">The pinion meshes with the rack generating two forces: a tangential one, which moves the supporting structure, and a radial one, which pushes or pulls the components away from the fixing point. It’s this second force that often determines the durability of the fixing over time.<\/p>\n<p class=\"article__p\">With a 20\u00b0 <strong><dfn id=\"def-angolo-di-pressione\"><span class=\"glossary-term\" data-tooltip=\"tt-angolo-di-pressione\" title=\"Angle between the direction of the contact force between mating teeth and the tangent to the pitch circle at the point of contact. The standard value is 20\u00b0.\">pressure angle<\/span><\/dfn><\/strong>, the radial force is about <strong>36%<\/strong> of the tangential force. A tangential force of 1000 N generates about 364 N of radial force. Screws, brackets or welds must resist both tension and transverse thrust.<\/p>\n<p class=\"article__p\">The tangential force is calculated from the motor torque and the pinion diameter:<\/p>\n<h2 class=\"article__h2\" id=\"ft-2t-d\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M14.7 6.3a1 1 0 0 0 0 1.4l1.6 1.6a1 1 0 0 0 1.4 0l3.77-3.77a6 6 0 0 1-7.94 7.94l-6.91 6.91a2.12 2.12 0 0 1-3-3l6.91-6.91a6 6 0 0 1 7.94-7.94l-3.76 3.76z\"><\/path><\/svg><\/span>\n Ft = 2T \/ d\n<\/h2>\n<p class=\"article__p\">Where T is the torque and d the <strong><dfn id=\"def-diametro-primitivo\"><span class=\"glossary-term\" data-tooltip=\"tt-diametro-primitivo\" title=\"Diameter of the theoretical circle at which contact occurs between two meshing gears. Obtained from the product of the module and the number of teeth.\">pitch diameter<\/span><\/dfn><\/strong> of the pinion. Smaller pinions increase the transmitted force and the stresses on the fixing.<\/p>\n<h2 class=\"article__h2\" id=\"bolting\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><circle cx=\"12\" cy=\"5\" r=\"1\"><\/circle><circle cx=\"19\" cy=\"5\" r=\"1\"><\/circle><circle cx=\"5\" cy=\"5\" r=\"1\"><\/circle><circle cx=\"12\" cy=\"12\" r=\"1\"><\/circle><circle cx=\"19\" cy=\"12\" r=\"1\"><\/circle><circle cx=\"5\" cy=\"12\" r=\"1\"><\/circle><circle cx=\"12\" cy=\"19\" r=\"1\"><\/circle><circle cx=\"19\" cy=\"19\" r=\"1\"><\/circle><circle cx=\"5\" cy=\"19\" r=\"1\"><\/circle><\/svg><\/span>\n Bolting\n<\/h2>\n<p class=\"article__p\">The most versatile choice: it allows fixing, adjustment, pitch correction and replacement of sections without disassembling everything. You need a drill, level, pencil, measuring tape, screwdriver or driver, screws and suitable anchors.<\/p>\n<p class=\"article__p\">For wall supports, the type of anchor depends on the load and the wall structure: for hollow walls <strong>toggle anchors<\/strong> are used, for solid masonry and heavy loads <strong>certified-quality nylon anchors<\/strong>.<\/p>\n<h2 class=\"article__h2\" id=\"bracketing\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M14 14.76V3.5a2.5 2.5 0 0 0-5 0v11.26a4.5 4.5 0 1 0 5 0z\"><\/path><\/svg><\/span>\n Bracketing\n<\/h2>\n<p class=\"article__p\">Useful when you can’t work along the entire base of the supporting structure, or when a fast assembly is needed. The brackets distribute the load over several points, but the spacing between them is decisive.<\/p>\n<div class=\"infobox infobox--grey\">\n <div class=\"infobox__title\">\n <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M14.7 6.3a1 1 0 0 0 0 1.4l1.6 1.6a1 1 0 0 0 1.4 0l3.77-3.77a6 6 0 0 1-7.94 7.94l-6.91 6.91a2.12 2.12 0 0 1-3-3l6.91-6.91a6 6 0 0 1 7.94-7.94l-3.76 3.76z\"><\/path><\/svg>\n Technical note\n <\/div>\n <p class=\"infobox__text\">Brackets too far apart cause local bending of the rack, vibration, irregular wear and loss of contact with the pinion. Calculate the bracket spacing based on the radial force and the allowable bending for the chosen profile.<\/p>\n<\/div>\n<h2 class=\"article__h2\" id=\"thermal-expansion-and-joints-between-sections\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><rect x=\"8\" y=\"2\" width=\"8\" height=\"4\" rx=\"1\" ry=\"1\"><\/rect><path d=\"M16 4h2a2 2 0 0 1 2 2v14a2 2 0 0 1-2 2H6a2 2 0 0 1-2-2V6a2 2 0 0 1 2-2h2\"><\/path><line x1=\"12\" y1=\"11\" x2=\"16\" y2=\"11\"><\/line><line x1=\"12\" y1=\"16\" x2=\"16\" y2=\"16\"><\/line><line x1=\"8\" y1=\"11\" x2=\"8.01\" y2=\"11\"><\/line><line x1=\"8\" y1=\"16\" x2=\"8.01\" y2=\"16\"><\/line><\/svg><\/span>\n Thermal expansion and joints between sections\n<\/h2>\n<p class=\"article__p\">Nylon racks have a <strong>thermal expansion coefficient<\/strong> of about 80-100 \u00d7 10\u207b\u2076 \/\u00b0C. On 1 meter with a variation of 50 \u00b0C, the elongation is about 4.5 mm: enough to change the backlash with the pinion, with a consequent increase in friction and wear.<\/p>\n<p class=\"article__p\">To manage expansion, provide one fixed point and other points that allow longitudinal sliding. Not every fixing point has to be rigid. Slotted holes, assembly clearances, wide washers and controlled joints allow expansion without excessive stress.<\/p>\n<p class=\"article__p\">The joints between sections can be made with plates, male-female inserts or overlaps. Maintain pitch continuity from one section to the next: any discontinuity becomes a mechanical obstacle to the passage of the pinion.<\/p>\n<div class=\"warnbox\">\n <div class=\"warnbox__title\">\n <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M10.29 3.86L1.82 18a2 2 0 0 0 1.71 3h16.94a2 2 0 0 0 1.71-3L13.71 3.86a2 2 0 0 0-3.42 0z\"><\/path><line x1=\"12\" y1=\"9\" x2=\"12\" y2=\"13\"><\/line><line x1=\"12\" y1=\"17\" x2=\"12.01\" y2=\"17\"><\/line><\/svg>\n Warning\n <\/div>\n <p class=\"warnbox__text\">In nylon with a steel core, the differential expansion between plastic and metal can create internal stress on long runs or with strong thermal swings. Avoid excessive constraints and leave sliding margin at the non-fixed points.<\/p>\n<\/div>\n<h2 class=\"article__h2\" id=\"assembly-notes\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><circle cx=\"12\" cy=\"12\" r=\"10\"><\/circle><\/svg><\/span>\n Assembly notes\n<\/h2>\n<p class=\"article__p\">Make sure the supporting structure is completely mounted and secured before proceeding with the rack, in compliance with <strong>UNI EN 13241:2016<\/strong>. Use a measuring tape, level, drill and screwdriver to guarantee precision and alignment.<\/p>\n<h2 class=\"article__h2\" id=\"operating-checklist\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><circle cx=\"12\" cy=\"12\" r=\"10\"><\/circle><\/svg><\/span>\n Operating checklist\n<\/h2>\n<ol class=\"article__list\">\n <li><strong>Verify<\/strong> motor torque, pinion diameter and tangential force.<\/li>\n <li><strong>Calculate<\/strong> the radial force from the pressure angle (20\u00b0).<\/li>\n <li><strong>Define<\/strong> the number and position of the fixing points.<\/li>\n <li><strong>Use<\/strong> a level, tape and pencil before drilling.<\/li>\n <li><strong>Drill<\/strong> the holes with the correct bit for the support material.<\/li>\n <li><strong>Choose<\/strong> screws, anchors, inserts or brackets based on the calculated load.<\/li>\n <li><strong>Leave<\/strong> clearance for thermal expansion.<\/li>\n <li><strong>Check<\/strong> the pitch between sections before commissioning.<\/li>\n <li><strong>Verify<\/strong> manually the sliding before powering the motor and control unit.<\/li>\n <li><strong>Check<\/strong> the absence of obstacles along the entire travel.<\/li>\n<\/ol>\n<p class=\"article__p\">For configurations with off-standard loads, long runs or particular thermal conditions, <a href=\"https:\/\/shop.stagnoligears.com\/en\/contacts\/\" target=\"_blank\" rel=\"noopener\" class=\"cta-link\">write<\/a> to us at the technical office: we verify the fixing method and the sizing of the critical points together.<\/p>\n\n <\/div>\n <\/div>\n <\/div>\n\n\n<script>\n (function () {\n var hideTimers = {};\n function positionTooltip(trigger, tooltip) {\n var margin = 8;\n tooltip.style.visibility = 'hidden';\n tooltip.style.top = '-9999px';\n tooltip.style.left = 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stresses and vibrations.<\/p>\n","protected":false},"parent":0,"template":"","meta":{"_acf_changed":false},"campo-applicazione":[5457],"categoria-ct":[5446],"class_list":["post-25607","centro-tecnico","type-centro-tecnico","status-publish","hentry","campo-applicazione-assembly","categoria-ct-racks-and-matching-pinions"],"acf":[],"yoast_head":"\n<title>Rack Fixing Methods: Bolting or Bracketing | Stagnoli Gears Shop<\/title>\n<meta name=\"description\" content=\"Compare rack fixing methods such as bolting and bracketing, and learn how forces, precision, maintenance and installation affect rack performance.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/shop.stagnoligears.com\/en\/technical-hub\/rack-fixing-methods-welding-vs-bolting-vs-bracketing\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta 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