{"id":100110,"date":"2026-02-15T20:17:05","date_gmt":"2026-02-15T20:17:05","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100110"},"modified":"2026-07-12T08:21:20","modified_gmt":"2026-07-12T08:21:20","slug":"gear-accuracy-class","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/ms\/calculators\/gear-accuracy-class\/","title":{"rendered":"Documented Gear-Deviation Limit Comparator"},"content":{"rendered":"\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Documented Gear-Deviation Limit Comparator\",\"description\":\"Compare a measured nonnegative gear-deviation magnitude with a documented allowable limit in the same characteristic and conditions. The tool does not calculate ISO 1328 tolerance classes or limits.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/gear-accuracy-class\/\",\"applicationCategory\":\"Engineering Calculator\",\"operatingSystem\":\"Any (Web Browser)\",\"offers\":{\"@type\":\"Offer\",\"price\":\"0\",\"priceCurrency\":\"EUR\"},\"creator\":{\"@type\":\"Organization\",\"name\":\"Vibromera\",\"url\":\"https:\/\/vibromera.eu\/\"},\"dateModified\":\"2026-07-12\",\"inLanguage\":\"en\",\"isAccessibleForFree\":true}<\/script>\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Does this calculator determine an ISO 1328 flank tolerance class?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. It only compares a measured magnitude with a limit supplied from the exact licensed standard,drawing or contract. It does not calculate class limits or recommend a class.\"}},{\"@type\":\"Question\",\"name\":\"What must match between measured value and limit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The deviation characteristic,gear scope,evaluation range,filtering,flank\/direction,unit and all other governing conditions must be the same. Measurement uncertainty is not included.\"}}]}<\/script>\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"BreadcrumbList\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/vibromera.eu\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Calculators\",\"item\":\"https:\/\/vibromera.eu\/calculators\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Documented gear-deviation limit comparator\",\"item\":\"https:\/\/vibromera.eu\/calculators\/gear-accuracy-class\/\"}]}<\/script>\r\n<link rel=\"preconnect\" 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20px;font-size:13px;font-weight:700;color:#fff;background:var(--vc-accent);border-radius:var(--vc-radius);text-decoration:none;white-space:nowrap;transition:background .15s}.vc-promo-link:hover{background:var(--vc-accent-hover)}.vc-footer{text-align:center;padding:32px 16px;font-size:13px;color:var(--vc-ink-muted)}.vc-footer a{color:var(--vc-accent);text-decoration:none}.vc-footer a:hover{text-decoration:underline}.vc-footer-links{margin-top:8px;font-size:12px}.vc-footer-links a{margin:0 8px}@media print{.vc-section-body{max-height:none!important}.vc-faq-a{max-height:none!important}.vc-results{max-height:none!important;padding:24px!important}.vc-copy-btn,.vc-section-chevron,.vc-faq-chevron,.vc-presets,.vc-promo{display:none!important}}\r\n.vc-form-grid-limit{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.vc-result-note{margin:0;color:var(--vc-ink-secondary);font-size:13px}.vc-status-neutral{display:inline-block;padding:4px 9px;border-radius:5px;background:var(--vc-blue-light);color:var(--vc-blue);font-weight:700}.vc-status-warn{display:inline-block;padding:4px 9px;border-radius:5px;background:var(--vc-red-light);color:var(--vc-red);font-weight:700}@media(max-width:600px){.vc-form-grid-limit{grid-template-columns:1fr}}\r\n<\/style>\r\n<div class=\"vc-calculator\" id=\"vc-gear-limit\"><header class=\"vc-header\"><p class=\"vc-header-eyebrow\">Document-controlled comparison \u2014 no generated ISO limit<\/p><h1 class=\"vc-header-title\">Documented Gear-Deviation Limit Comparator<\/h1><p class=\"vc-header-subtitle\">Compare one measured gear-deviation magnitude with a documented allowable limit for the same characteristic,gear and evaluation conditions. This tool does not calculate or recommend an ISO flank tolerance class.<\/p><div class=\"vc-badges\"><span class=\"vc-badge\">margin=L\u2212M<\/span><span class=\"vc-badge\">utilization=100M\/L<\/span><span class=\"vc-badge\">No invented ISO table<\/span><\/div><\/header>\r\n<div class=\"vc-card\"><form class=\"vc-form\" id=\"vc-form\" autocomplete=\"off\"><div class=\"vc-form-grid-limit\">\r\n<div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-characteristic\">Deviation characteristic \/ identifier<\/label><input class=\"vc-input\" id=\"vc-characteristic\" type=\"text\" placeholder=\"e.g. exact drawing\/standard symbol and evaluation range\"><\/div>\r\n<div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-unit\">Value unit<\/label><select class=\"vc-select\" id=\"vc-unit\"><option value=\"\">Select\u2026<\/option><option value=\"um\">\u00b5m<\/option><option value=\"mm\">mm<\/option><option value=\"in\">in<\/option><\/select><\/div>\r\n<div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-measured\">Measured deviation magnitude M<\/label><input class=\"vc-input\" id=\"vc-measured\" type=\"text\" inputmode=\"decimal\" placeholder=\"e.g. 12\"><\/div>\r\n<div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-limit\">Documented allowable limit L<\/label><input class=\"vc-input\" id=\"vc-limit\" type=\"text\" inputmode=\"decimal\" placeholder=\"e.g. 15\"><\/div>\r\n<div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-limit-source\">Limit provenance<\/label><input class=\"vc-input\" id=\"vc-limit-source\" type=\"text\" placeholder=\"e.g. ISO1328-1:2013 licensed table\/row or drawing rev\"><\/div>\r\n<div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-measure-source\">Measurement provenance<\/label><input class=\"vc-input\" id=\"vc-measure-source\" type=\"text\" placeholder=\"e.g. report,flank,direction,filter,range\"><\/div>\r\n<\/div><p id=\"vc-error\" role=\"alert\" style=\"margin:.75rem 0 0;color:#b42318\"><\/p><div class=\"vc-warning-box\"><p style=\"margin:0\"><strong>Comparison boundary:<\/strong> M and L must describe the same deviation characteristic,scope,flank\/direction,evaluation range,filtering and unit. This arithmetic does not establish traceability,measurement uncertainty,guard bands or conformity under a standard. \u201cWithin\u201d means only M\u2264L for the supplied numbers.<\/p><\/div><\/form>\r\n<div class=\"vc-results\" id=\"vc-results\" aria-live=\"polite\"><div class=\"vc-results-head\"><h2 class=\"vc-results-title\">Documented-limit arithmetic<\/h2><button type=\"button\" class=\"vc-copy-btn\" id=\"vc-copy-btn\">Copy<\/button><\/div><div class=\"vc-result-grid\">\r\n<div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Measured magnitude M<\/div><div class=\"vc-rcard-value\" id=\"vc-r-m\">\u2014<\/div><\/div><div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Documented limit L<\/div><div class=\"vc-rcard-value\" id=\"vc-r-l\">\u2014<\/div><\/div><div class=\"vc-rcard vc-rcard-primary\"><div class=\"vc-rcard-label\">Arithmetic comparison<\/div><div class=\"vc-rcard-value\" id=\"vc-r-status\">\u2014<\/div><\/div><div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Margin L\u2212M<\/div><div class=\"vc-rcard-value\" id=\"vc-r-margin\">\u2014<\/div><\/div><div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Utilization 100M\/L<\/div><div class=\"vc-rcard-value\" id=\"vc-r-util\">\u2014<\/div><\/div><div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Ratio M\/L<\/div><div class=\"vc-rcard-value\" id=\"vc-r-ratio\">\u2014<\/div><\/div><div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Measured normalized<\/div><div class=\"vc-rcard-value\" id=\"vc-r-mum\">\u2014<\/div><\/div><div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Limit normalized<\/div><div class=\"vc-rcard-value\" id=\"vc-r-lum\">\u2014<\/div><\/div>\r\n<\/div><p class=\"vc-result-note\" id=\"vc-r-note\"><\/p><\/div><\/div>\r\n<div class=\"vc-section vc-open\"><button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"true\"><span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\ud83d\udcd8<\/span><span class=\"vc-section-title\">Formula,standard scope and limits<\/span><\/span><\/button><div class=\"vc-section-body\"><div class=\"vc-section-inner vc-theory\">\r\n<h3>Implemented arithmetic only<\/h3><div class=\"vc-formula-box\">margin=L\u2212M<br>ratio=M\/L<br>utilization=100(M\/L)%<br>comparison: M&lt;L, M=L, or M&gt;L<\/div><p>M and L are nonnegative magnitudes in the same unit. Exact conversions are1mm=1000\u00b5m and1in=25400\u00b5m. The comparison adds no class,tolerance,rounding or uncertainty rule.<\/p>\r\n<h3>ISO1328 scope checked<\/h3><p><a href=\"https:\/\/www.iso.org\/standard\/45309.html\" target=\"_blank\" rel=\"noopener\">ISO1328-1:2013,edition2<\/a> establishes a flank-tolerance classification system for manufacturing and conformity assessment of tooth flanks of individual cylindrical involute gears. It defines terms,the class-system structure and allowable values;the edition was confirmed current in2024. The official card does not expose the numerical formulae,tables or rounding clauses,so this page does not reproduce them.<\/p>\r\n<p><a href=\"https:\/\/www.iso.org\/standard\/70386.html\" target=\"_blank\" rel=\"noopener\">ISO1328-2:2020,edition2<\/a> is a separate system for double-flank radial composite deviations and is limited to its stated gear scope. <a href=\"https:\/\/www.iso.org\/standard\/77653.html\" target=\"_blank\" rel=\"noopener\">ISO\/TR10064-1:2019,edition3<\/a> supplements Part1 with measurement practice for pitch,profile,helix and tangential composite characteristics;double-flank testing is excluded there.<\/p>\r\n<h3>Why class calculation was removed<\/h3><p>The former page asserted exact clause numbers,base formula coefficients,\u221a2 class scaling,rounding rules and application recommendations without a licensed source. A plausible-looking formula is not proof of ISO conformity. Exact class limits must be taken from the licensed current standard for the actual gear geometry and deviation characteristic.<\/p>\r\n<h3>No conformity or class selection<\/h3><p>Even a numerical M\u2264L comparison is not a complete conformity statement when measurement uncertainty,traceability,sampling,filtering or decision rules matter. This page does not recommend a class or application. Preserve the source row,edition,drawing and measurement report with the result.<\/p>\r\n<\/div><\/div><\/div><footer class=\"vc-footer\"><p>\u00a92024\u20132026 <a href=\"https:\/\/vibromera.eu\/\">Vibromera<\/a><\/p><p>Documented-limit comparison only,not an ISO1328 tolerance generator or gear-class recommendation. Scientific review:July2026.<\/p><\/footer><\/div>\r\n<script>(function(){'use strict';function $(id){return document.getElementById(id)}var ids=['vc-r-m','vc-r-l','vc-r-status','vc-r-margin','vc-r-util','vc-r-ratio','vc-r-mum','vc-r-lum'];function num(raw){var s=String(raw).trim().replace(',','.');return \/^[+]?(?:\\d+(?:\\.\\d*)?|\\.\\d+)(?:[eE][+-]?\\d+)?$\/.test(s)?Number(s):NaN}function fmt(x){return Number(x.toPrecision(12)).toString()}function clear(){ids.forEach(function(id){$(id).textContent='\u2014'});$('vc-r-note').textContent='';$('vc-results').classList.remove('vc-visible')}function setUrl(){var u=new URL(location),map={characteristic:'vc-characteristic',unit:'vc-unit',measured:'vc-measured',limit:'vc-limit',limit_source:'vc-limit-source',measure_source:'vc-measure-source'};Object.keys(map).forEach(function(k){var v=$(map[k]).value.trim();if(v)u.searchParams.set(k,v);else u.searchParams.delete(k)});history.replaceState(null,'',u.toString())}function fail(m){clear();$('vc-error').textContent=m}function calc(){setUrl();var characteristic=$('vc-characteristic').value.trim(),unit=$('vc-unit').value,mr=$('vc-measured').value.trim(),lr=$('vc-limit').value.trim(),ls=$('vc-limit-source').value.trim(),ms=$('vc-measure-source').value.trim();if(!characteristic&&!unit&&!mr&&!lr&&!ls&&!ms){clear();$('vc-error').textContent='';return}if(!characteristic||!unit||!mr||!lr||!ls||!ms){fail('Enter the characteristic,unit,both values,and limit and measurement provenance.');return}var M=num(mr),L=num(lr),factor=unit==='mm'?1000:unit==='in'?25400:1,label=unit==='um'?'\u00b5m':unit;if(!Number.isFinite(M)||M<0||!Number.isFinite(M*factor)||M*factor>1e100){fail('Measured magnitude must be a strict nonnegative number no greater than10\u00b9\u2070\u2070\u00b5m after conversion.');return}if(!Number.isFinite(L)||L<=0||!Number.isFinite(L*factor)||L*factor>1e100){fail('Documented limit must be a strict positive number no greater than10\u00b9\u2070\u2070\u00b5m after conversion.');return}var margin=L-M,ratio=M\/L,util=100*ratio,Mum=M*factor,Lum=L*factor;if(![margin,ratio,util,Mum,Lum].every(Number.isFinite)){fail('The comparison exceeds the finite numerical range.');return}$('vc-error').textContent='';$('vc-r-m').textContent=fmt(M)+' '+label;$('vc-r-l').textContent=fmt(L)+' '+label;var status=M<L?'Within supplied limit (M<L)':M===L?'At supplied limit (M=L)':'Exceeds supplied limit (M>L)';$('vc-r-status').textContent=status;$('vc-r-status').className='vc-rcard-value '+(M<=L?'vc-status-neutral':'vc-status-warn');$('vc-r-margin').textContent=fmt(margin)+' '+label;$('vc-r-util').textContent=fmt(util)+' %';$('vc-r-ratio').textContent=fmt(ratio);$('vc-r-mum').textContent=fmt(Mum)+' \u00b5m';$('vc-r-lum').textContent=fmt(Lum)+' \u00b5m';$('vc-r-note').textContent='Characteristic:'+characteristic+' | Limit:'+ls+' | Measurement:'+ms+' | Arithmetic comparison only;uncertainty and conformity decision not included.';$('vc-results').classList.add('vc-visible')}$('vc-form').addEventListener('input',calc);$('vc-form').addEventListener('change',calc);$('vc-copy-btn').addEventListener('click',function(){if(navigator.clipboard)navigator.clipboard.writeText($('vc-results').innerText)});document.querySelectorAll('.vc-section-toggle').forEach(function(b){b.addEventListener('click',function(){var s=this.closest('.vc-section');s.classList.toggle('vc-open');this.setAttribute('aria-expanded',s.classList.contains('vc-open'))})});var q=new URLSearchParams(location.search),map={characteristic:'vc-characteristic',unit:'vc-unit',measured:'vc-measured',limit:'vc-limit',limit_source:'vc-limit-source',measure_source:'vc-measure-source'};Object.keys(map).forEach(function(k){if(q.has(k))$(map[k]).value=q.get(k)});calc()})();<\/script>\r\n","protected":false},"excerpt":{"rendered":"<p>Compare one measured gear-deviation magnitude with a documented same-characteristic allowable limit. 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