{"id":100026,"date":"2026-02-15T20:07:04","date_gmt":"2026-02-15T20:07:04","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100026"},"modified":"2026-07-11T19:21:46","modified_gmt":"2026-07-11T19:21:46","slug":"bearing-relubrication-interval","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/sv\/calculators\/bearing-relubrication-interval\/","title":{"rendered":"Dataverktyg f\u00f6r planering av eftersm\u00f6rjning av lager"},"content":{"rendered":"\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Bearing Relubrication Planning Data Helper\",\"description\":\"Calculate bearing mean diameter dm and speed factor n\u00d7dm for use with a verified bearing-manufacturer relubrication chart or software. This page does not estimate an interval.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/bearing-relubrication-interval\/\",\"applicationCategory\":\"Engineering Calculator\",\"operatingSystem\":\"Any (Web Browser)\",\"offers\":{\"@type\":\"Offer\",\"price\":\"0\",\"priceCurrency\":\"EUR\"},\"creator\":{\"@type\":\"Organization\",\"name\":\"Vibromera\",\"url\":\"https:\/\/vibromera.eu\/\"},\"datePublished\":\"2025-01-01\",\"dateModified\":\"2026-07-11\",\"inLanguage\":\"en\",\"isAccessibleForFree\":true}<\/script>\r\n\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Does this page calculate a relubrication interval?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. It calculates only dm=(d+D)\/2 and n\u00d7dm. Obtain the interval from the current chart or software of the exact bearing and grease manufacturer.\"}},{\"@type\":\"Question\",\"name\":\"Why is bearing type not a single multiplier?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Manufacturer methods use bearing-family factors together with speed factor, load ratio, grease, temperature and application conditions. A universal type multiplier is not sufficient.\"}},{\"@type\":\"Question\",\"name\":\"What else is needed for an interval?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Use the exact bearing designation, load or C\/P, grease performance and temperature limits, operating temperature, shaft orientation, contamination, vibration, outer-ring rotation and manufacturer-specific instructions.\"}}]}<\/script>\r\n\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\":\"Relubrication Interval\",\"item\":\"https:\/\/vibromera.eu\/calculators\/bearing-relubrication-interval\/\"}]}<\/script>\r\n\r\n<link rel=\"preconnect\" 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class=\"vc-calculator\">\r\n<header class=\"vc-header\">\r\n    <p class=\"vc-header-eyebrow\">Free Engineering Tool #052<\/p>\r\n    <h1 class=\"vc-header-title\">Bearing Relubrication Planning Data Helper<\/h1>\r\n    <p class=\"vc-header-subtitle\">Calculate mean diameter d<sub>m<\/sub> and speed factor n\u00b7d<sub>m<\/sub> for use with the current chart or software of the exact bearing and grease manufacturer.<\/p>\r\n    <div class=\"vc-badges\"><span class=\"vc-badge\">Verified Inputs<\/span><span class=\"vc-badge\">No Invented Interval<\/span><span class=\"vc-badge\">Manufacturer Method Required<\/span><\/div>\r\n<\/header>\r\n<div class=\"vc-card\">\r\n    <form class=\"vc-form\" id=\"vc-form\" autocomplete=\"off\">\r\n        <div class=\"vc-form-grid\">\r\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-bore\">Bearing Bore d <span class=\"vc-label-hint\">(mm)<\/span><\/label><input class=\"vc-input\" type=\"text\" id=\"vc-bore\" inputmode=\"decimal\" autocomplete=\"off\" value=\"40\"><\/div>\r\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-od\">Bearing Outside Diameter D <span class=\"vc-label-hint\">(mm)<\/span><\/label><input class=\"vc-input\" type=\"text\" id=\"vc-od\" inputmode=\"decimal\" autocomplete=\"off\" value=\"80\"><\/div>\r\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-speed\">Rotational Speed n <span class=\"vc-label-hint\">(r\/min)<\/span><\/label><input class=\"vc-input\" type=\"text\" id=\"vc-speed\" inputmode=\"decimal\" autocomplete=\"off\" value=\"1500\"><\/div>\r\n        <\/div>\r\n        <div class=\"vc-warning-box\"><p><strong>No interval is calculated.<\/strong> The previous page formula and fixed condition multipliers could not be verified as an SKF method and omitted required load, grease and application inputs. Use the output below only as input to current manufacturer documentation.<\/p><\/div>\r\n    <\/form>\r\n    <div class=\"vc-results\" id=\"vc-results\">\r\n        <div class=\"vc-results-head\"><h2 class=\"vc-results-title\">Results<\/h2><button type=\"button\" class=\"vc-copy-btn\" id=\"vc-copy-btn\"><svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><rect x=\"9\" y=\"9\" width=\"13\" height=\"13\" rx=\"2\"\/><path d=\"M5 15H4a2 2 0 01-2-2V4a2 2 0 012-2h9a2 2 0 012 2v1\"\/><\/svg> Copy<\/button><\/div>\r\n        <div class=\"vc-result-grid\">\r\n            <div class=\"vc-rcard vc-rcard-primary\"><div class=\"vc-rcard-label\">Speed Factor n \u00d7 d<sub>m<\/sub><\/div><div class=\"vc-rcard-value\" id=\"vc-r-ndm\">\u2014<\/div><\/div>\r\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Mean Diameter d<sub>m<\/sub><\/div><div class=\"vc-rcard-value\" id=\"vc-r-dm\">\u2014<\/div><\/div>\r\n        <\/div>\r\n    <\/div>\r\n<\/div>\r\n\r\n<div class=\"vc-section vc-open\" id=\"vc-sec-theory\"><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\">Theory &amp; Formulas<\/span><\/span><svg class=\"vc-section-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button>\r\n    <div class=\"vc-section-body\"><div class=\"vc-section-inner vc-theory\">\r\n        <h3>Verified preparatory calculations<\/h3>\r\n        <div class=\"vc-formula-box\">d<sub>m<\/sub> = (d + D) \/ 2<\/div>\r\n        <div class=\"vc-formula-box\">speed factor = n \u00d7 d<sub>m<\/sub><\/div>\r\n        <p>SKF\u2019s current public guidance derives relubrication interval from a manufacturer diagram or calculator using bearing factor b<sub>f<\/sub> \u00d7 n \u00d7 d<sub>m<\/sub>, load ratio C\/P and application conditions. Temperature, vertical shaft, vibration, outer-ring rotation, contamination, bearing size and some cage designs can require different treatment; contamination is not a universal numeric multiplier.<\/p>\r\n        <div class=\"vc-info-box\"><p>Use the exact bearing designation and grease in the current <a href=\"https:\/\/www.skf.com\/group\/support\/engineering-tools\/skf-bearing-select\" target=\"_blank\" rel=\"noopener\">manufacturer calculation tool<\/a>, or the equivalent tool\/documentation from the selected bearing manufacturer.<\/p><\/div>\r\n    <\/div><\/div>\r\n<\/div>\r\n\r\n<div class=\"vc-section\" id=\"vc-sec-related\"><button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"false\"><span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\ud83d\udd17<\/span><span class=\"vc-section-title\">Related Calculators<\/span><\/span><svg class=\"vc-section-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button>\r\n    <div class=\"vc-section-body\"><div class=\"vc-section-inner\"><div class=\"vc-related\"><a class=\"vc-related-link\" href=\"\/calculators\/bearing-grease-quantity\/\">Grease Quantity<\/a><a class=\"vc-related-link\" href=\"\/calculators\/bearing-speed-factor\/\">Speed Factor n\u00d7dm<\/a><a class=\"vc-related-link\" href=\"\/calculators\/bearing-modified-life-l10a\/\">Bearing Life L10a<\/a><\/div><\/div><\/div>\r\n<\/div>\r\n<div class=\"vc-section\" id=\"vc-sec-faq\"><button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"false\"><span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\u2753<\/span><span class=\"vc-section-title\">Frequently Asked Questions<\/span><\/span><svg class=\"vc-section-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button>\r\n    <div class=\"vc-section-body\"><div class=\"vc-section-inner\"><div class=\"vc-faq-list\" id=\"vc-faq-list\"><\/div><\/div><\/div>\r\n<\/div>\r\n<div class=\"vc-promo\"><div class=\"vc-promo-text\"><strong>Vibromera \u2014 Portable Balancing &amp; Vibration Analysis<\/strong><br>Professional vibration analyzers for bearing condition monitoring.<\/div><a class=\"vc-promo-link\" href=\"https:\/\/vibromera.eu\/\" target=\"_blank\" rel=\"noopener\">Learn More<\/a><\/div>\r\n<footer class=\"vc-footer\"><p>\u00a9 2024\u20132026 <a href=\"https:\/\/vibromera.eu\/\">Vibromera<\/a><\/p><p style=\"font-size:12px;margin-top:4px;\">Unsafe interval formula removed. Scientific review: July 2026<\/p><div class=\"vc-footer-links\"><a href=\"\/calculators\/engineering-calculators\/\">All Calculators<\/a><a href=\"https:\/\/vibromera.eu\/contacts\/\">Contact<\/a><\/div><\/footer>\r\n<\/div>\r\n<script src=\"https:\/\/cdn.jsdelivr.net\/npm\/katex@0.16.11\/dist\/katex.min.js\"><\/script>\r\n<script>\r\n(function(){\r\n    'use strict';var SLUG='bearing-relubrication-interval';\r\n    function $(id){return document.getElementById(id)}\r\n    function fmt(n,d){if(isNaN(n)||!isFinite(n))return'\u2014';return n.toFixed(d===undefined?0:d).replace(\/(\\.\\d*?)0+$\/,'$1').replace(\/\\.$\/,'')}\r\n    function fmtInt(n){if(isNaN(n)||!isFinite(n))return'\u2014';return Math.round(n).toLocaleString('en-US');}\r\n    function parseLocaleNumber(raw){var normalized=String(raw).trim().replace(\/\\s+\/g,'');if(!\/^[+-]?(?:\\d+(?:[.,]\\d*)?|[.,]\\d+)$\/.test(normalized))return NaN;return Number(normalized.replace(',','.'));}\r\n\r\n    function calculate(){\r\n        var d=parseLocaleNumber($('vc-bore').value),D=parseLocaleNumber($('vc-od').value),n=parseLocaleNumber($('vc-speed').value);\r\n        if(!isFinite(d)||d<=0||!isFinite(D)||D<=d||!isFinite(n)||n<=0){$('vc-results').classList.remove('vc-visible');return;}\r\n        var dm=(d+D)\/2;\r\n        var ndm=n*dm;\r\n        if(!isFinite(dm)||!isFinite(ndm)){$('vc-results').classList.remove('vc-visible');return;}\r\n        $('vc-r-dm').innerHTML=fmt(dm,2)+' <span class=\"vc-rcard-unit\">mm<\/span>';\r\n        $('vc-r-ndm').innerHTML=fmtInt(ndm)+' <span class=\"vc-rcard-unit\">mm\u00b7r\/min<\/span>';\r\n        $('vc-results').classList.add('vc-visible');\r\n        var u=new URL(window.location);u.searchParams.set('d',d);u.searchParams.set('D',D);u.searchParams.set('n',n);history.replaceState(null,'',u.toString());\r\n        saveHistory({d:d,D:D,n:n,_summary:'dm='+fmt(dm,2)+' mm; n\u00d7dm='+fmtInt(ndm)});\r\n    }\r\n\r\n    $('vc-form').addEventListener('input',calculate);$('vc-form').addEventListener('change',calculate);\r\n\r\n    $('vc-copy-btn').addEventListener('click',function(){var text='Bearing Relubrication Planning Data\\n\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\\nd='+$('vc-bore').value+' D='+$('vc-od').value+' mm, n='+$('vc-speed').value+' r\/min\\ndm: '+$('vc-r-dm').textContent+'\\nn\u00d7dm: '+$('vc-r-ndm').textContent+'\\n\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\\nvibromera.eu';if(navigator.clipboard){navigator.clipboard.writeText(text).then(function(){var b=$('vc-copy-btn');b.classList.add('vc-copied');b.innerHTML='<svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><polyline points=\"20 6 9 17 4 12\"\/><\/svg> Copied!';setTimeout(function(){b.classList.remove('vc-copied');b.innerHTML='<svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><rect x=\"9\" y=\"9\" width=\"13\" height=\"13\" rx=\"2\"\/><path d=\"M5 15H4a2 2 0 01-2-2V4a2 2 0 012-2h9a2 2 0 012 2v1\"\/><\/svg> Copy';},2000);});}});\r\n\r\n    document.querySelectorAll('.vc-section-toggle').forEach(function(btn){btn.addEventListener('click',function(){var s=this.closest('.vc-section');s.classList.toggle('vc-open');this.setAttribute('aria-expanded',s.classList.contains('vc-open'));});});\r\n\r\n    var faqData=[{q:'Does this page calculate a relubrication interval?',a:'<p>No. It calculates only d<sub>m<\/sub>=(d+D)\/2 and n\u00d7d<sub>m<\/sub>. Obtain the interval from the current chart or software for the exact bearing and grease.<\/p>'},{q:'Why is bearing type not a single multiplier?',a:'<p>Manufacturer methods combine bearing-family factors with speed factor, load ratio, grease, temperature and application conditions. A universal type multiplier is insufficient.<\/p>'},{q:'What else is needed?',a:'<p>Use exact bearing designation, load or C\/P, grease performance and temperature limits, operating temperature, orientation, contamination, vibration, outer-ring rotation and manufacturer-specific instructions.<\/p>'}];\r\n    var fl=$('vc-faq-list');faqData.forEach(function(f){fl.innerHTML+='<div class=\"vc-faq-item\"><button type=\"button\" class=\"vc-faq-q\"><span>'+f.q+'<\/span><svg class=\"vc-faq-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button><div class=\"vc-faq-a\"><div class=\"vc-faq-a-inner\">'+f.a+'<\/div><\/div><\/div>';});\r\n    fl.addEventListener('click',function(e){var b=e.target.closest('.vc-faq-q');if(b)b.closest('.vc-faq-item').classList.toggle('vc-open');});\r\n\r\n    function saveHistory(entry){var key='vc_history_'+SLUG;var arr=[];try{arr=JSON.parse(localStorage.getItem(key))||[];}catch(e){}entry._ts=new Date().toISOString();arr.unshift(entry);if(arr.length>10)arr=arr.slice(0,10);try{localStorage.setItem(key,JSON.stringify(arr));}catch(e){}}\r\n    function loadParams(){var p=new URLSearchParams(window.location.search);if(p.has('d'))$('vc-bore').value=p.get('d');if(p.has('D'))$('vc-od').value=p.get('D');if(p.has('n'))$('vc-speed').value=p.get('n');}\r\n    function init(){loadParams();calculate();}\r\n    if(document.readyState==='loading'){document.addEventListener('DOMContentLoaded',init);}else{init();}\r\n})();\r\n<\/script>\r\n","protected":false},"excerpt":{"rendered":"<p>Gratis online-kalkylator f\u00f6r lagerfettets eftersm\u00f6rjningsintervall med SKF-metoden. Ange lagertyp, hastighet, h\u00e5ldiameter, temperatur och f\u00f6rorening f\u00f6r att f\u00e5 eftersm\u00f6rjningsintervallet i timmar.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-100026","calculator","type-calculator","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/sv\/wp-json\/wp\/v2\/calculator\/100026","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/sv\/wp-json\/wp\/v2\/calculator"}],"about":[{"href":"https:\/\/vibromera.eu\/sv\/wp-json\/wp\/v2\/types\/calculator"}],"version-history":[{"count":2,"href":"https:\/\/vibromera.eu\/sv\/wp-json\/wp\/v2\/calculator\/100026\/revisions"}],"predecessor-version":[{"id":102312,"href":"https:\/\/vibromera.eu\/sv\/wp-json\/wp\/v2\/calculator\/100026\/revisions\/102312"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/sv\/wp-json\/wp\/v2\/media?parent=100026"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/sv\/wp-json\/wp\/v2\/categories?post=100026"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/sv\/wp-json\/wp\/v2\/tags?post=100026"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}