{"id":100276,"date":"2026-02-15T20:31:30","date_gmt":"2026-02-15T20:31:30","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100276"},"modified":"2026-07-02T19:47:07","modified_gmt":"2026-07-02T19:47:07","slug":"v-belt-calculator","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/sw\/calculators\/v-belt-calculator\/","title":{"rendered":"Kikokotoo cha Kuchagua Ukanda wa V | ISO 5288 | Zana ya Bure ya Mtandaoni"},"content":{"rendered":"\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"V-Belt Selection Calculator\",\"alternateName\":[\"V-Belt Calculator\",\"Belt Cross-Section Calculator\",\"Number of Belts Calculator\"],\"description\":\"Free V-belt selection calculator. Calculate belt cross-section and number of belts needed. Belt profiles per ISO 4184; power ratings based on typical manufacturer catalogue data.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/v-belt-calculator\/\",\"applicationCategory\":\"Engineering Calculator\",\"operatingSystem\":\"Any (Web Browser)\",\"offers\":{\"@type\":\"Offer\",\"price\":\"0\",\"priceCurrency\":\"EUR\"},\"creator\":{\"@type\":\"Organization\",\"name\":\"Vibromera\",\"url\":\"https:\/\/vibromera.eu\/\"},\"datePublished\":\"2024-01-01\",\"dateModified\":\"2025-02-14\",\"inLanguage\":\"en\",\"isAccessibleForFree\":true,\"featureList\":[\"Classical and narrow V-belt profiles\",\"Service factor selection\",\"Power rating per belt\",\"Number of belts calculation\",\"Cross-section recommendation\",\"Auto-calculation\"],\"keywords\":\"V-belt, ISO 4184, belt selection, SPZ, SPA, SPB, SPC\"}\n<\/script>\n\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[\n{\"@type\":\"Question\",\"name\":\"How do I select the right V-belt cross-section?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"V-belt cross-section is selected based on design power (power \u00d7 service factor) and the speed of the faster shaft. Use selection charts: Z\/SPZ for up to ~4 kW, A\/SPA for ~2-20 kW, B\/SPB for ~5-60 kW, C\/SPC for ~15-150 kW, D for ~50-500 kW.\"}},\n{\"@type\":\"Question\",\"name\":\"What is the difference between classical and narrow V-belts?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Classical V-belts (Z, A, B, C, D) have a wider profile. Narrow V-belts (SPZ, SPA, SPB, SPC) transmit more power per belt and per unit width. Narrow belts are preferred for new designs due to higher power density and efficiency.\"}},\n{\"@type\":\"Question\",\"name\":\"How do I calculate the number of belts needed?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Number of belts = Design Power \/ (Power per belt \u00d7 Correction factors). Correction factors include wrap angle factor (C1), belt length factor (C3), and number-of-belts factor. Round up to the nearest whole number.\"}},\n{\"@type\":\"Question\",\"name\":\"What service factors apply to V-belt drives?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Service factors for V-belts: 1.0-1.2 for uniform loads (fans, pumps), 1.1-1.3 for light shocks, 1.2-1.4 for moderate shocks, 1.3-1.8 for heavy shocks. Multiply by 1.2 for more than 10 hours\/day operation.\"}},\n{\"@type\":\"Question\",\"name\":\"What is the maximum recommended V-belt speed?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Maximum recommended belt speed: 25-30 m\/s for classical V-belts, up to 40 m\/s for narrow V-belts. Above these speeds, centrifugal forces significantly reduce belt capacity and special high-speed belts should be used.\"}}\n]}\n<\/script>\n\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"BreadcrumbList\",\"itemListElement\":[\n{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/vibromera.eu\/\"},\n{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Calculators\",\"item\":\"https:\/\/vibromera.eu\/calculators\/\"},\n{\"@type\":\"ListItem\",\"position\":3,\"name\":\"V-Belt Selection Calculator\",\"item\":\"https:\/\/vibromera.eu\/calculators\/v-belt-calculator\/\"}\n]}\n<\/script>\n\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n\n<link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin>\n\n<link 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Belt profiles per ISO 4184; power ratings based on typical manufacturer catalogue data. Enter power, speed, service factor, and pulley diameter.<\/p>\n    <div class=\"vc-badges\">\n        <span class=\"vc-badge\">ISO 4184 profiles<\/span>\n        <span class=\"vc-badge\">Z\/A\/B\/C\/D<\/span>\n        <span class=\"vc-badge\">SPZ\/SPA\/SPB\/SPC<\/span>\n    <\/div>\n<\/header>\n\n<div class=\"vc-card\">\n    <form class=\"vc-form\" id=\"vc-form\" autocomplete=\"off\">\n        <div class=\"vc-form-grid\">\n            <div class=\"vc-field\">\n                <label class=\"vc-label\" for=\"vc-power\">Power <span class=\"vc-label-hint\">(kW)<\/span><\/label>\n                <input class=\"vc-input\" type=\"number\" id=\"vc-power\" inputmode=\"decimal\" step=\"any\" min=\"0.1\" placeholder=\"e.g. 15\" value=\"15\">\n            <\/div>\n            <div class=\"vc-field\">\n                <label class=\"vc-label\" for=\"vc-speed\">Faster Shaft Speed <span class=\"vc-label-hint\">(RPM)<\/span><\/label>\n                <input class=\"vc-input\" type=\"number\" id=\"vc-speed\" inputmode=\"decimal\" step=\"any\" min=\"1\" placeholder=\"e.g. 1500\" value=\"1500\">\n            <\/div>\n            <div class=\"vc-field\">\n                <label class=\"vc-label\" for=\"vc-sf\">Service Factor<\/label>\n                <select class=\"vc-select\" id=\"vc-sf\">\n                    <option value=\"1.0\">1.0 \u2014 Uniform (\u226410 h\/day)<\/option>\n                    <option value=\"1.1\">1.1 \u2014 Uniform (10\u201316 h\/day)<\/option>\n                    <option value=\"1.2\" selected>1.2 \u2014 Light shocks<\/option>\n                    <option value=\"1.3\">1.3 \u2014 Moderate shocks<\/option>\n                    <option value=\"1.5\">1.5 \u2014 Heavy shocks<\/option>\n                    <option value=\"1.8\">1.8 \u2014 Very heavy shocks<\/option>\n                <\/select>\n            <\/div>\n            <div class=\"vc-field\">\n                <label class=\"vc-label\" for=\"vc-d1\">Small Pulley Diameter <span class=\"vc-label-hint\">(mm)<\/span><\/label>\n                <input class=\"vc-input\" type=\"number\" id=\"vc-d1\" inputmode=\"decimal\" step=\"any\" min=\"40\" placeholder=\"e.g. 125\" value=\"125\">\n            <\/div>\n            <div class=\"vc-field\">\n                <label class=\"vc-label\" for=\"vc-profile\">Belt Profile<\/label>\n                <select class=\"vc-select\" id=\"vc-profile\">\n                    <option value=\"Z\">Z \u2014 Classical (top width 10 mm)<\/option>\n                    <option value=\"A\">A \u2014 Classical (top width 13 mm)<\/option>\n                    <option value=\"B\" selected>B \u2014 Classical (top width 17 mm)<\/option>\n                    <option value=\"C\">C \u2014 Classical (top width 22 mm)<\/option>\n                    <option value=\"D\">D \u2014 Classical (top width 32 mm)<\/option>\n                    <option value=\"SPZ\">SPZ \u2014 Narrow (top width 9.7 mm)<\/option>\n                    <option value=\"SPA\">SPA \u2014 Narrow (top width 12.7 mm)<\/option>\n                    <option value=\"SPB\">SPB \u2014 Narrow (top width 16.3 mm)<\/option>\n                    <option value=\"SPC\">SPC \u2014 Narrow (top width 22 mm)<\/option>\n                <\/select>\n            <\/div>\n            <div class=\"vc-field\">\n                <label class=\"vc-label\" for=\"vc-ratio\">Speed Ratio <span class=\"vc-label-hint\">(D\u2082\/D\u2081)<\/span><\/label>\n                <input class=\"vc-input\" type=\"number\" id=\"vc-ratio\" inputmode=\"decimal\" step=\"any\" min=\"1\" placeholder=\"e.g. 2\" value=\"2\">\n            <\/div>\n        <\/div>\n\n        <div class=\"vc-presets\">\n            <div class=\"vc-presets-label\">Quick presets<\/div>\n            <button type=\"button\" class=\"vc-preset-btn\" data-p=\"3\" data-s=\"1440\" data-sf=\"1.2\" data-d=\"80\" data-pr=\"SPZ\" data-r=\"2\">Fan 3 kW \/ SPZ<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-p=\"15\" data-s=\"1500\" data-sf=\"1.2\" data-d=\"125\" data-pr=\"B\" data-r=\"2\">Pump 15 kW \/ B<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-p=\"45\" data-s=\"1500\" data-sf=\"1.3\" data-d=\"200\" data-pr=\"SPB\" data-r=\"3\">Compressor 45 kW \/ SPB<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-p=\"110\" data-s=\"1000\" data-sf=\"1.5\" data-d=\"250\" data-pr=\"SPC\" data-r=\"4\">Crusher 110 kW \/ SPC<\/button>\n        <\/div>\n    <\/form>\n\n    <div class=\"vc-results\" id=\"vc-results\">\n        <div class=\"vc-results-head\">\n            <h2 class=\"vc-results-title\">Results<\/h2>\n            <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>\n        <\/div>\n        <div class=\"vc-result-grid\">\n            <div class=\"vc-rcard vc-rcard-primary\">\n                <div class=\"vc-rcard-label\">Number of Belts Required<\/div>\n                <div class=\"vc-rcard-value\" id=\"vc-r-nbelts\">\u2014<\/div>\n            <\/div>\n            <div class=\"vc-rcard\">\n                <div class=\"vc-rcard-label\">Design Power (P<sub>d<\/sub>)<\/div>\n                <div class=\"vc-rcard-value\" id=\"vc-r-pd\">\u2014<\/div>\n            <\/div>\n            <div class=\"vc-rcard\">\n                <div class=\"vc-rcard-label\">Power Per Belt (P<sub>b<\/sub>)<\/div>\n                <div class=\"vc-rcard-value\" id=\"vc-r-pb\">\u2014<\/div>\n            <\/div>\n            <div class=\"vc-rcard\">\n                <div class=\"vc-rcard-label\">Recommended Profile<\/div>\n                <div class=\"vc-rcard-value\" id=\"vc-r-rec\">\u2014<\/div>\n            <\/div>\n            <div class=\"vc-rcard\">\n                <div class=\"vc-rcard-label\">Belt Speed<\/div>\n                <div class=\"vc-rcard-value\" id=\"vc-r-speed\">\u2014<\/div>\n            <\/div>\n        <\/div>\n    <\/div>\n<\/div>\n\n<div class=\"vc-section vc-open\" id=\"vc-sec-theory\">\n    <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>\n    <div class=\"vc-section-body\">\n        <div class=\"vc-section-inner vc-theory\">\n            <h3>Design Power<\/h3>\n            <div class=\"vc-formula-box\" id=\"vc-katex-1\"><\/div>\n            <h3>Number of Belts<\/h3>\n            <div class=\"vc-formula-box\" id=\"vc-katex-2\"><\/div>\n            <p>Where C\u2081 is wrap angle factor, C\u2083 is belt length factor, and P<sub>b<\/sub> is the basic power rating per belt.<\/p>\n\n            <h3>V-Belt Cross-Section Selection Guide<\/h3>\n            <table class=\"vc-table\">\n                <thead><tr><th>Profile<\/th><th>Type<\/th><th>Top Width<\/th><th>Power Range (typical)<\/th><th>Min Pulley \u2300<\/th><\/tr><\/thead>\n                <tbody>\n                    <tr><td>Z<\/td><td>Classical<\/td><td>10 mm<\/td><td>0.2 \u2013 4 kW<\/td><td>50 mm<\/td><\/tr>\n                    <tr><td>A<\/td><td>Classical<\/td><td>13 mm<\/td><td>0.5 \u2013 15 kW<\/td><td>75 mm<\/td><\/tr>\n                    <tr><td>B<\/td><td>Classical<\/td><td>17 mm<\/td><td>2 \u2013 55 kW<\/td><td>125 mm<\/td><\/tr>\n                    <tr><td>C<\/td><td>Classical<\/td><td>22 mm<\/td><td>10 \u2013 150 kW<\/td><td>200 mm<\/td><\/tr>\n                    <tr><td>D<\/td><td>Classical<\/td><td>32 mm<\/td><td>40 \u2013 500 kW<\/td><td>355 mm<\/td><\/tr>\n                    <tr><td>SPZ<\/td><td>Narrow<\/td><td>9.7 mm<\/td><td>0.5 \u2013 8 kW<\/td><td>63 mm<\/td><\/tr>\n                    <tr><td>SPA<\/td><td>Narrow<\/td><td>12.7 mm<\/td><td>1.5 \u2013 30 kW<\/td><td>90 mm<\/td><\/tr>\n                    <tr><td>SPB<\/td><td>Narrow<\/td><td>16.3 mm<\/td><td>5 \u2013 80 kW<\/td><td>140 mm<\/td><\/tr>\n                    <tr><td>SPC<\/td><td>Narrow<\/td><td>22 mm<\/td><td>20 \u2013 250 kW<\/td><td>224 mm<\/td><\/tr>\n                <\/tbody>\n            <\/table>\n\n            <div class=\"vc-info-box\"><p><strong>Tip:<\/strong> Narrow V-belts (SPZ, SPA, SPB, SPC) offer 30\u201350% more power capacity per belt than classical sections and are recommended for new designs.<\/p><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n\n<div class=\"vc-section\" id=\"vc-sec-related\">\n    <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>\n    <div class=\"vc-section-body\"><div class=\"vc-section-inner\"><div class=\"vc-related\">\n        <a class=\"vc-related-link\" href=\"\/calculators\/belt-drive-calculator\/\">Belt Drive Calculator<\/a>\n        <a class=\"vc-related-link\" href=\"\/calculators\/timing-belt-calculator\/\">Timing Belt Calculator<\/a>\n        <a class=\"vc-related-link\" href=\"\/calculators\/chain-drive-calculator\/\">Chain Drive Calculator<\/a>\n        <a class=\"vc-related-link\" href=\"\/calculators\/drive-efficiency-calculator\/\">Drive Efficiency Calculator<\/a>\n    <\/div><\/div><\/div>\n<\/div>\n\n<div class=\"vc-section\" id=\"vc-sec-faq\">\n    <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>\n    <div class=\"vc-section-body\"><div class=\"vc-section-inner\"><div class=\"vc-faq-list\" id=\"vc-faq-list\"><\/div><\/div><\/div>\n<\/div>\n\n<div class=\"vc-promo\"><div class=\"vc-promo-text\"><strong>Vibromera \u2014 Portable Balancing &amp; Vibration Analysis<\/strong><br>Professional field balancing instruments and software. Used in 50+ countries.<\/div><a class=\"vc-promo-link\" href=\"https:\/\/vibromera.eu\/\" target=\"_blank\" rel=\"noopener\">Learn More<\/a><\/div>\n<footer class=\"vc-footer\"><p>\u00a9 2024\u20132025 <a href=\"https:\/\/vibromera.eu\/\">Vibromera<\/a> \u2014 Engineering Calculators<\/p><p style=\"font-size:12px;margin-top:4px;\">Belt profiles per ISO 4184; power ratings based on typical manufacturer catalogue data. Last updated: February 2025<\/p><div class=\"vc-footer-links\"><a href=\"\/calculators\/engineering-calculators\/\">All Calculators<\/a><a href=\"https:\/\/vibromera.eu\/contacts\/\">Contact<\/a><\/div><\/footer>\n\n<\/div>\n\n<script src=\"https:\/\/cdn.jsdelivr.net\/npm\/katex@0.16.11\/dist\/katex.min.js\"><\/script>\n<script>\n(function(){\n    'use strict';\n    var SLUG='v-belt-calculator';\n    function $(id){return document.getElementById(id)}\n    function fmt(n,d){if(isNaN(n)||!isFinite(n))return '\u2014';var f=n.toFixed(d===undefined?2:d);return f.replace(\/(\\.\\d*?)0+$\/,'$1').replace(\/\\.$\/,'')}\n\n    \/\/ Approximate basic power ratings per belt at 1500 RPM (kW) - simplified reference values\n    var beltPower={\n        Z:{pb:1.0,rec:[0,4]},A:{pb:2.8,rec:[0,15]},B:{pb:5.5,rec:[2,55]},C:{pb:12,rec:[10,150]},D:{pb:30,rec:[40,500]},\n        SPZ:{pb:2.0,rec:[0,8]},SPA:{pb:5.0,rec:[1.5,30]},SPB:{pb:10,rec:[5,80]},SPC:{pb:20,rec:[20,250]}\n    };\n\n    function recommendProfile(Pd){\n        var profiles=['SPZ','SPA','SPB','SPC'];\n        for(var i=0;i<profiles.length;i++){\n            var p=profiles[i];\n            if(Pd<=beltPower[p].rec[1]) return p;\n        }\n        return 'SPC';\n    }\n\n    function calculate(){\n        var P=parseFloat($('vc-power').value);\n        var n=parseFloat($('vc-speed').value);\n        var sf=parseFloat($('vc-sf').value);\n        var d1=parseFloat($('vc-d1').value);\n        var profile=$('vc-profile').value;\n        var ratio=parseFloat($('vc-ratio').value)||1;\n        if(!P||P<=0||!n||n<=0||!d1||d1<=0){$('vc-results').classList.remove('vc-visible');return}\n\n        var Pd=P*sf;\n        var beltSpeed=Math.PI*d1*n\/60000;\n        var bp=beltPower[profile];\n        \/\/ Adjust power rating by speed factor (simplified)\n        var speedFactor=n\/1500;\n        if(speedFactor>1)speedFactor=Math.sqrt(speedFactor);\n        var Pb=bp.pb*speedFactor;\n        \/\/ Wrap angle correction (approximate for ratio)\n        var wrapFactor=ratio<=1.5?1.0:(ratio<=2?0.95:(ratio<=3?0.90:0.85));\n        var Pbcorr=Pb*wrapFactor;\n        var nBelts=Math.ceil(Pd\/Pbcorr);\n        if(nBelts<1)nBelts=1;\n\n        var rec=recommendProfile(Pd);\n\n        $('vc-r-nbelts').innerHTML=nBelts+' <span class=\"vc-rcard-unit\">\u00d7 '+profile+'<\/span>';\n        $('vc-r-pd').innerHTML=fmt(Pd,1)+' <span class=\"vc-rcard-unit\">kW<\/span>';\n        $('vc-r-pb').innerHTML=fmt(Pbcorr,2)+' <span class=\"vc-rcard-unit\">kW\/belt<\/span>';\n        $('vc-r-rec').innerHTML='<span style=\"color:var(--vc-accent)\">'+rec+'<\/span> <span class=\"vc-rcard-unit\">(narrow V-belt)<\/span>';\n        $('vc-r-speed').innerHTML=fmt(beltSpeed,1)+' <span class=\"vc-rcard-unit\">m\/s<\/span>'+(beltSpeed>30?' <span class=\"vc-rcard-unit\" style=\"color:var(--vc-red)\">\u26a0 High<\/span>':'');\n\n        $('vc-results').classList.add('vc-visible');\n    }\n\n    document.querySelectorAll('.vc-preset-btn').forEach(function(btn){\n        btn.addEventListener('click',function(e){\n            e.preventDefault();\n            $('vc-power').value=this.getAttribute('data-p');\n            $('vc-speed').value=this.getAttribute('data-s');\n            $('vc-sf').value=this.getAttribute('data-sf');\n            $('vc-d1').value=this.getAttribute('data-d');\n            $('vc-profile').value=this.getAttribute('data-pr');\n            $('vc-ratio').value=this.getAttribute('data-r');\n            calculate();\n        });\n    });\n\n    $('vc-form').addEventListener('input',calculate);\n    $('vc-form').addEventListener('change',calculate);\n\n    $('vc-copy-btn').addEventListener('click',function(){\n        var text='V-Belt Selection\\n\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\\nBelts: '+$('vc-r-nbelts').textContent+'\\nDesign Power: '+$('vc-r-pd').textContent+'\\nPower\/Belt: '+$('vc-r-pb').textContent+'\\nBelt Speed: '+$('vc-r-speed').textContent+'\\n\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\\nvibromera.eu\/calculators\/'+SLUG+'\/';\n        if(navigator.clipboard){navigator.clipboard.writeText(text).then(function(){var b=$('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)})}\n    });\n\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'))})});\n\n    var faqData=[\n        {q:'How do I select the right V-belt cross-section?',a:'<p>Selection is based on design power (power \u00d7 service factor) and speed. Use Z\/SPZ for \u22644 kW, A\/SPA for 2\u201320 kW, B\/SPB for 5\u201360 kW, C\/SPC for 15\u2013150 kW, D for 50\u2013500 kW.<\/p>'},\n        {q:'What is the difference between classical and narrow V-belts?',a:'<p>Classical V-belts (Z, A, B, C, D) have wider profiles. Narrow V-belts (SPZ, SPA, SPB, SPC) transmit 30\u201350% more power per belt and are preferred for new designs.<\/p>'},\n        {q:'How do I calculate the number of belts needed?',a:'<p>Number of belts = Design Power \/ (Power per belt \u00d7 Correction factors). Include wrap angle factor, belt length factor. Always round up to the nearest whole number.<\/p>'},\n        {q:'What service factors apply to V-belt drives?',a:'<p>1.0\u20131.2 for uniform loads (fans, pumps), 1.1\u20131.3 for light shocks, 1.2\u20131.4 for moderate shocks, 1.3\u20131.8 for heavy shocks. Multiply by 1.2 for &gt;10 hours\/day operation.<\/p>'},\n        {q:'What is the maximum recommended V-belt speed?',a:'<p>25\u201330 m\/s for classical V-belts, up to 40 m\/s for narrow V-belts. Above these speeds, centrifugal forces reduce capacity significantly.<\/p>'}\n    ];\n    var fl=$('vc-faq-list');faqData.forEach(function(f){fl.innerHTML+='<div class=\"vc-faq-item\"><button type=\"button\" class=\"vc-faq-q\"><span>'+f.q+'<\/span><svg class=\"vc-faq-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button><div class=\"vc-faq-a\"><div class=\"vc-faq-a-inner\">'+f.a+'<\/div><\/div><\/div>'});\n    fl.addEventListener('click',function(e){var b=e.target.closest('.vc-faq-q');if(b)b.closest('.vc-faq-item').classList.toggle('vc-open')});\n\n    function renderFormulas(){\n        try{\n            katex.render('P_d = P \\\\times K_A',$('vc-katex-1'),{displayMode:true,throwOnError:false});\n            katex.render('z = \\\\left\\\\lceil \\\\frac{P_d}{P_b \\\\times C_1 \\\\times C_3} \\\\right\\\\rceil',$('vc-katex-2'),{displayMode:true,throwOnError:false});\n        }catch(e){}\n    }\n\n    function init(){renderFormulas();calculate()}\n    if(document.readyState==='loading'){document.addEventListener('DOMContentLoaded',init)}else{init()}\n})();\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Kikokotoo cha bure cha kuchagua mkanda wa V kwa mujibu wa ISO 5288. Ingiza nguvu, kasi, na kipengele cha huduma ili kuchagua sehemu ya mkanda (Z, A, B, C, D, SPZ, SPA, SPB, SPC) na kuhesabu idadi ya mikanda inayohitajika.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-100276","calculator","type-calculator","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/sw\/wp-json\/wp\/v2\/calculator\/100276","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/sw\/wp-json\/wp\/v2\/calculator"}],"about":[{"href":"https:\/\/vibromera.eu\/sw\/wp-json\/wp\/v2\/types\/calculator"}],"version-history":[{"count":2,"href":"https:\/\/vibromera.eu\/sw\/wp-json\/wp\/v2\/calculator\/100276\/revisions"}],"predecessor-version":[{"id":102139,"href":"https:\/\/vibromera.eu\/sw\/wp-json\/wp\/v2\/calculator\/100276\/revisions\/102139"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/sw\/wp-json\/wp\/v2\/media?parent=100276"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/sw\/wp-json\/wp\/v2\/categories?post=100276"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/sw\/wp-json\/wp\/v2\/tags?post=100276"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}