{"id":100291,"date":"2026-02-15T20:32:08","date_gmt":"2026-02-15T20:32:08","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100291"},"modified":"2026-07-17T03:56:19","modified_gmt":"2026-07-17T03:56:19","slug":"vibration-iso20816-9-gears","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/tr\/calculators\/vibration-iso20816-9-gears\/","title":{"rendered":"Gear Unit Vibration Evidence Worksheet and GMF Reference"},"content":{"rendered":"\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Gear Unit Vibration Evidence Worksheet and Fixed-Axis GMF Reference\",\"description\":\"Organize applicability, acceptance context, measurement and source evidence for qualified ISO 20816-9:2020 review. 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id=\"vbm-gu-eval\">\n  <header class=\"gu-head\">\n    <h1>Gear Unit Vibration Evidence Worksheet and GMF Reference<\/h1>\n    <p>Organize applicability, acceptance context, measurement and source evidence for qualified review against ISO 20816-9:2020. The separate fixed-axis gear-mesh-frequency calculator is a general engineering reference; it does not calculate an ISO vibration grade, gear condition diagnosis, alarm, trip or operating instruction.<\/p>\n    <div class=\"gu-tags\"><span class=\"gu-tag\">ISO 20816-9:2020 &#8211; Edition 1<\/span><span class=\"gu-tag\">Current &#8211; confirmed 13 July 2026<\/span><span class=\"gu-tag\">10 kW to 100 MW<\/span><span class=\"gu-tag\">30 to 12 000 r\/min<\/span><span class=\"gu-tag\">Acceptance context<\/span><span class=\"gu-tag\">Steady-state broad-band vibration<\/span><span class=\"gu-tag\">No automatic grade<\/span><\/div>\n  <\/header>\n  <div class=\"gu-warning\"><strong>Not a condition, protection or operating decision.<\/strong> Never derive a diagnosis, monitoring interval, alarm, trip setpoint, continued-operation decision, load restriction, maintenance schedule or shutdown instruction from this website. Apply the licensed current standard, exact grade and measurement procedure, manufacturer\/customer agreement, manufacturer\/site limits, process risk, protection philosophy and accountable qualified review.<\/div>\n\n  <div class=\"gu-grid\">\n    <section class=\"gu-card\" aria-labelledby=\"gu-record-title\">\n      <h2 class=\"gu-card-head\" id=\"gu-record-title\">Evaluation-evidence record<\/h2>\n      <div class=\"gu-card-body\">\n        <form id=\"gu-form\" novalidate>\n          <div class=\"gu-form-grid\">\n            <div class=\"gu-field\"><label for=\"gu-unit-id\">Gear unit identification<\/label><input id=\"gu-unit-id\" type=\"text\" maxlength=\"260\" required><\/div>\n            <div class=\"gu-field\"><label for=\"gu-enclosure\">Housing configuration<\/label><select id=\"gu-enclosure\" required><option value=\"\">Select documented configuration<\/option><option value=\"individually-enclosed\">Individually housed and enclosed gear unit<\/option><option value=\"integrated\">Integrated into another machine or common casing<\/option><option value=\"open\">Open gear train<\/option><option value=\"other\">Another configuration<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><\/div>\n            <div class=\"gu-field\"><label for=\"gu-function\">Gear-unit function<\/label><select id=\"gu-function\" required><option value=\"\">Select documented function<\/option><option value=\"increasing\">Speed-increasing gear unit<\/option><option value=\"reducing\">Speed-reducing gear unit<\/option><option value=\"other\">Another function<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><\/div>\n            <div class=\"gu-field\"><label for=\"gu-power-scope\">Nominal power scope<\/label><select id=\"gu-power-scope\" required><option value=\"\">Select documented scope<\/option><option value=\"within\">10 kW to 100 MW, inclusive<\/option><option value=\"outside\">Outside 10 kW to 100 MW<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><\/div>\n            <div class=\"gu-field\"><label for=\"gu-power-record\">Nominal power and unit<\/label><input id=\"gu-power-record\" type=\"text\" maxlength=\"220\" required><\/div>\n            <div class=\"gu-field\"><label for=\"gu-speed-scope\">Nominal rotational-speed scope<\/label><select id=\"gu-speed-scope\" required><option value=\"\">Select documented scope<\/option><option value=\"within\">30 to 12 000 r\/min, inclusive<\/option><option value=\"outside\">Outside 30 to 12 000 r\/min<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><\/div>\n            <div class=\"gu-field\"><label for=\"gu-speed-record\">Input\/output\/internal shaft speeds<\/label><input id=\"gu-speed-record\" type=\"text\" maxlength=\"320\" required><\/div>\n            <div class=\"gu-field\"><label for=\"gu-context\">Evaluation context<\/label><select id=\"gu-context\" required><option value=\"\">Select documented context<\/option><option value=\"manufacturer-acceptance\">Acceptance test at manufacturer facility<\/option><option value=\"onsite-agreed\">On-site acceptance by manufacturer\/customer\/operator agreement<\/option><option value=\"routine-agreed\">Routine operational measurement by manufacturer\/customer\/operator agreement<\/option><option value=\"onsite-unagreed\">On-site or routine use without documented agreement<\/option><option value=\"other\">Another context<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><\/div>\n            <div class=\"gu-field\"><label for=\"gu-agreement\">Agreement record<\/label><select id=\"gu-agreement\" required><option value=\"\">Select documented status<\/option><option value=\"not-required-manufacturer\">Manufacturer-facility acceptance context<\/option><option value=\"recorded\">Agreement between applicable parties is recorded<\/option><option value=\"absent\">Required agreement is absent<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><\/div>\n            <div class=\"gu-field\"><label for=\"gu-design-range\">Within design operating ranges<\/label><select id=\"gu-design-range\" required><option value=\"\">Select documented status<\/option><option value=\"within\">Speed, load, temperature and lubrication all within design range<\/option><option value=\"outside\">One or more outside design range<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><\/div>\n            <div class=\"gu-field\"><label for=\"gu-state\">Measurement state<\/label><select id=\"gu-state\" required><option value=\"\">Select documented state<\/option><option value=\"steady\">Normal steady-state operation<\/option><option value=\"runup\">Run-up or run-down<\/option><option value=\"initial-load\">Initial loading<\/option><option value=\"load-change\">Load change or another transient<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><\/div>\n            <div class=\"gu-field\"><label for=\"gu-drivetrain\">Excluded drive-train check<\/label><select id=\"gu-drivetrain\" required><option value=\"\">Select documented result<\/option><option value=\"standalone\">Not a listed special\/auxiliary\/integrated excluded train<\/option><option value=\"integrated-machine\">Integrated gear-driven compressor, pump, turbine or similar train<\/option><option value=\"combined-cycle-clutch\">Gear-type clutch on combined-cycle turbo generator<\/option><option value=\"pto\">Power take-off gear<\/option><option value=\"special-other\">Another special or auxiliary drive train<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><\/div>\n            <div class=\"gu-field\"><label for=\"gu-purpose\">Evaluation purpose<\/label><select id=\"gu-purpose\" required><option value=\"\">Select documented purpose<\/option><option value=\"acceptance-grade\">Licensed vibration-grade acceptance review<\/option><option value=\"routine-broadband\">Agreed routine broad-band severity review<\/option><option value=\"gear-diagnosis\">Gear condition or tooth-fault diagnosis<\/option><option value=\"operating-decision\">Continue, monitor, maintain, reduce load or stop decision<\/option><option value=\"unknown\">Unknown or mixed purpose<\/option><\/select><\/div>\n            <div class=\"gu-field\"><label for=\"gu-target\">Measurement target and direction<\/label><select id=\"gu-target\" required><option value=\"\">Select documented target<\/option><option value=\"main-bearing-radial\">Main bearing housing\/pedestal, radial to shaft axis<\/option><option value=\"thrust-bearing-axial\">Thrust bearing housing, axial direction<\/option><option value=\"shaft-radial\">Rotating shaft, radial, at or close to main bearing<\/option><option value=\"casing-structural\">Gear-casing structural vibration<\/option><option value=\"torsional\">Torsional vibration<\/option><option value=\"other\">Another target\/direction<\/option><option value=\"unknown\">Unknown or not documented<\/option><\/select><\/div>\n            <div class=\"gu-field\"><label for=\"gu-quantity\">Measured vibration quantity<\/label><input id=\"gu-quantity\" type=\"text\" maxlength=\"280\" required><\/div>\n            <div class=\"gu-field\"><label for=\"gu-amplitude\">Amplitude convention and statistic<\/label><input id=\"gu-amplitude\" type=\"text\" maxlength=\"260\" required><span class=\"gu-hint\">Record RMS, peak, peak-to-peak or the exact licensed convention.<\/span><\/div>\n            <div class=\"gu-field\"><label for=\"gu-unit\">Reported unit<\/label><input id=\"gu-unit\" type=\"text\" maxlength=\"120\" required><\/div>\n            <div class=\"gu-field\"><label for=\"gu-value\">Reported value as recorded<\/label><input id=\"gu-value\" type=\"text\" maxlength=\"300\" required><span class=\"gu-hint\">Decimal point or decimal comma is preserved. No numerical grade is calculated.<\/span><\/div>\n            <div class=\"gu-field gu-field-full\"><label for=\"gu-band\">Broad-band frequency range, filtering and signal processing<\/label><input id=\"gu-band\" type=\"text\" maxlength=\"380\" required><\/div>\n            <div class=\"gu-field gu-field-full\"><label for=\"gu-positions\">Measurement positions, directions, grouping and grade mapping<\/label><textarea id=\"gu-positions\" maxlength=\"950\" required><\/textarea><\/div>\n            <div class=\"gu-field gu-field-full\"><label for=\"gu-chain\">Instrumentation, transducer, mounting, calibration and complete measurement chain<\/label><textarea id=\"gu-chain\" maxlength=\"950\" required><\/textarea><\/div>\n            <div class=\"gu-field gu-field-full\"><label for=\"gu-operating-conditions\">Actual speed, load, temperature, lubrication and steady-state evidence<\/label><textarea id=\"gu-operating-conditions\" maxlength=\"950\" required><\/textarea><\/div>\n            <div class=\"gu-field gu-field-full\"><label for=\"gu-source-ref\">Licensed criterion and exact source reference<\/label><textarea id=\"gu-source-ref\" maxlength=\"900\" required><\/textarea><span class=\"gu-hint\">Record edition, clause\/table, grade\/group, quantity, target, boundary convention and applicable notes. Do not copy protected text into this public worksheet.<\/span><\/div>\n            <div class=\"gu-field gu-field-full\"><label for=\"gu-site-limits\">Manufacturer\/customer agreement, OEM\/site limits and protection philosophy<\/label><textarea id=\"gu-site-limits\" maxlength=\"900\" required><\/textarea><\/div>\n            <div class=\"gu-field\"><label for=\"gu-report\">Measurement report ID and date<\/label><input id=\"gu-report\" type=\"text\" maxlength=\"240\" required><\/div>\n            <div class=\"gu-field\"><label for=\"gu-reviewer\">Qualified reviewer and review date<\/label><input id=\"gu-reviewer\" type=\"text\" maxlength=\"240\" required><\/div>\n            <div class=\"gu-field gu-field-full\"><label for=\"gu-gaps\">Known gaps or unresolved questions<\/label><textarea id=\"gu-gaps\" maxlength=\"700\"><\/textarea><\/div>\n          <\/div>\n          <fieldset class=\"gu-evidence\">\n            <legend>Evidence categories present<\/legend>\n            <div class=\"gu-checks\">\n              <label class=\"gu-check\"><input id=\"gu-ev-edition\" type=\"checkbox\"><span>The current edition and predecessor lifecycle are verified.<small>ISO 20816-9:2020 Edition 1 was confirmed on 13 July 2026; ISO 8579-2:1993 is withdrawn.<\/small><\/span><\/label>\n              <label class=\"gu-check\"><input id=\"gu-ev-unit\" type=\"checkbox\"><span>Individually housed\/enclosed and speed-increasing\/reducing applicability is evidenced.<small>The public scope is not a three-option parallel\/planetary\/bevel selector.<\/small><\/span><\/label>\n              <label class=\"gu-check\"><input id=\"gu-ev-rating\" type=\"checkbox\"><span>Nominal power and speed are inside the public 10 kW to 100 MW and 30 to 12 000 r\/min ranges.<small>Actual rated values and units are traceable.<\/small><\/span><\/label>\n              <label class=\"gu-check\"><input id=\"gu-ev-context\" type=\"checkbox\"><span>Manufacturer-facility acceptance or the required on-site\/routine agreement is documented.<small>A generic website reading is not automatically an ISO acceptance test.<\/small><\/span><\/label>\n              <label class=\"gu-check\"><input id=\"gu-ev-operation\" type=\"checkbox\"><span>Design speed, load, temperature and lubrication ranges plus steady-state operation are evidenced.<small>Run-up, run-down, initial loading and load changes are excluded.<\/small><\/span><\/label>\n              <label class=\"gu-check\"><input id=\"gu-ev-exclusions\" type=\"checkbox\"><span>Special\/auxiliary integrated trains, specified gear clutches, PTO gears and torsional vibration are screened.<small>Excluded or unknown configurations do not pass public-scope screening.<\/small><\/span><\/label>\n              <label class=\"gu-check\"><input id=\"gu-ev-target\" type=\"checkbox\"><span>The measurement target and direction match one verified public broad-band category.<small>Housing\/pedestal, thrust, shaft-near-bearing and casing targets are distinguished.<\/small><\/span><\/label>\n              <label class=\"gu-check\"><input id=\"gu-ev-diagnosis\" type=\"checkbox\"><span>Acceptance\/severity review is separated from specialist gear-condition diagnosis.<small>The standard has limited application to gear condition; specialist techniques are outside scope.<\/small><\/span><\/label>\n              <label class=\"gu-check\"><input id=\"gu-ev-measurement\" type=\"checkbox\"><span>Quantity, statistic, unit, band, positions, grouping, operating conditions and measurement chain are documented.<small>A bare mm\/s value cannot establish a current grade.<\/small><\/span><\/label>\n              <label class=\"gu-check\"><input id=\"gu-ev-licensed\" type=\"checkbox\"><span>Every numerical criterion comes from the licensed current standard.<small>Exact grade, clause\/table, conditions, notes, comparison and rounding rules are controlled outside this website.<\/small><\/span><\/label>\n              <label class=\"gu-check\"><input id=\"gu-ev-site\" type=\"checkbox\"><span>Manufacturer\/customer agreement, OEM\/site limits and protection philosophy are separately controlled.<small>No web grade substitutes for acceptance or operation authority.<\/small><\/span><\/label>\n              <label class=\"gu-check\"><input id=\"gu-ev-review\" type=\"checkbox\"><span>The report, dataset and accountable qualified review are traceable.<small>This website never supplies a grade, diagnosis, interval or operating instruction.<\/small><\/span><\/label>\n            <\/div>\n          <\/fieldset>\n          <div class=\"gu-actions\"><button class=\"gu-btn\" type=\"submit\">Check evidence completeness<\/button><button class=\"gu-btn gu-btn-secondary\" id=\"gu-clear\" type=\"button\">Clear worksheet<\/button><\/div>\n          <div class=\"gu-result\" id=\"gu-result\" role=\"status\" aria-live=\"polite\"><h3 id=\"gu-result-title\">Not assessed<\/h3><p id=\"gu-result-summary\"><\/p><ul id=\"gu-result-list\"><\/ul><p class=\"gu-result-note\">This output is not an ISO vibration grade, condition diagnosis, alarm, trip setpoint, monitoring interval, acceptance decision or instruction to continue, maintain, reduce load or stop a machine.<\/p><\/div>\n        <\/form>\n      <\/div>\n    <\/section>\n\n    <aside class=\"gu-card\" aria-labelledby=\"gu-boundary-title\">\n      <h2 class=\"gu-card-head\" id=\"gu-boundary-title\">Verified public applicability boundary<\/h2>\n      <div class=\"gu-card-body\">\n        <span class=\"gu-status\">VERIFIED_OFFICIAL_STANDARD_RECORD<\/span>\n        <ul class=\"gu-side-list\">\n          <li>ISO 20816-9:2020 Edition 1 is published and was confirmed on 13 July 2026 at stage 90.93.<\/li>\n          <li>It covers individually housed, enclosed speed-increasing or speed-reducing gear units.<\/li>\n          <li>Nominal scope: 10 kW to 100 MW and 30 r\/min to 12 000 r\/min, inclusive.<\/li>\n          <li>Primary context: acceptance at the manufacturer&#8217;s facility within design speed, load, temperature and lubrication ranges.<\/li>\n          <li>On-site acceptance or routine operational use requires agreement between manufacturer and customer and\/or operator.<\/li>\n          <li>Torsional vibration is outside scope.<\/li>\n          <li>Listed special\/auxiliary integrated drive trains, specified combined-cycle gear clutches and power take-off gears are excluded.<\/li>\n          <li>Normal steady-state broad-band targets include main bearing housings\/pedestals radially, thrust housings axially, shafts radially near main bearings and gear-casing structural vibration.<\/li>\n          <li>Run-up, run-down, initial loading and load changes are outside scope.<\/li>\n          <li>Criteria have limited application to gear condition; specialist gear-condition techniques are outside scope.<\/li>\n        <\/ul>\n        <div class=\"gu-needs\"><strong>NEEDS_LICENSED_SOURCE<\/strong><br>Exact grades, numerical criteria, table\/group mapping, quantity and amplitude conventions, bandwidth, instrumentation, procedures, boundary inclusivity, rounding, aggregation and acceptance wording are protected. No numerical grade boundary is reproduced or inferred here.<\/div>\n      <\/div>\n    <\/aside>\n  <\/div>\n\n  <section class=\"gu-section\" aria-labelledby=\"gu-gmf-title\">\n    <h2 id=\"gu-gmf-title\">Fixed-axis gear mesh frequency reference<\/h2>\n    <div class=\"gu-section-body\">\n      <p>This separate calculator uses a general engineering kinematic relation documented by SKF. It is not an ISO 20816-9 classification formula. It applies to a conventional fixed-axis gear when the entered rotational speed belongs to the shaft carrying the entered tooth count. It does not model planetary\/epicyclic relative motion and does not diagnose damage.<\/p>\n      <div class=\"gu-formula\">f<sub>GMF<\/sub> = Z &times; n \/ 60&nbsp; Hz &nbsp;&nbsp;and&nbsp;&nbsp; GMF = Z &times; n&nbsp; cycles\/min<\/div>\n      <p class=\"gu-hint\">Z = positive integer number of teeth; n = shaft speed in r\/min. Source example: 50 teeth at 1 180 r\/min gives 59 000 cycles\/min, or 983.3 Hz.<\/p>\n      <form id=\"gu-gmf-form\" novalidate>\n        <div class=\"gu-gmf-grid\">\n          <div class=\"gu-field\"><label for=\"gu-gmf-teeth\">Number of teeth Z<\/label><input id=\"gu-gmf-teeth\" type=\"text\" inputmode=\"numeric\" maxlength=\"12\" placeholder=\"e.g. 50\" required><\/div>\n          <div class=\"gu-field\"><label for=\"gu-gmf-speed\">Shaft speed n (r\/min)<\/label><input id=\"gu-gmf-speed\" type=\"text\" inputmode=\"decimal\" maxlength=\"32\" placeholder=\"e.g. 1180 or 1180,5\" required><\/div>\n        <\/div>\n        <div class=\"gu-actions\"><button class=\"gu-btn\" type=\"submit\">Calculate fixed-axis GMF<\/button><button class=\"gu-btn gu-btn-secondary\" id=\"gu-gmf-clear\" type=\"button\">Clear GMF<\/button><\/div>\n        <div class=\"gu-gmf-output\" id=\"gu-gmf-output\" role=\"status\" aria-live=\"polite\"><h3 id=\"gu-gmf-result-title\">Not calculated<\/h3><p id=\"gu-gmf-summary\"><\/p><div class=\"gu-values\" id=\"gu-gmf-values\"><div class=\"gu-value\"><span>Gear mesh frequency<\/span><strong id=\"gu-gmf-hz\">&mdash;<\/strong><small>Hz<\/small><\/div><div class=\"gu-value\"><span>Gear mesh rate<\/span><strong id=\"gu-gmf-cpm\">&mdash;<\/strong><small>cycles\/min<\/small><\/div><\/div><p class=\"gu-hint\">General engineering reference only. A peak at this frequency or its sidebands is not by itself proof of a defect.<\/p><\/div>\n      <\/form>\n    <\/div>\n  <\/section>\n\n  <section class=\"gu-section\" aria-labelledby=\"gu-facts-title\"><h2 id=\"gu-facts-title\">What was corrected<\/h2><div class=\"gu-section-body gu-facts\">\n    <div class=\"gu-fact\"><strong>Nine unlicensed boundaries removed.<\/strong> The former three speed-category tables lacked a checked current clause\/table, grade mapping, quantity convention and boundary rules.<\/div>\n    <div class=\"gu-fact\"><strong>Fabricated planetary multiplier removed.<\/strong> Multiplying limits by 1.25 cannot create an ISO grade.<\/div>\n    <div class=\"gu-fact\"><strong>Bevel equivalence removed.<\/strong> Bevel and parallel units no longer silently share unsupported values.<\/div>\n    <div class=\"gu-fact\"><strong>Public rating scope restored.<\/strong> Power and nominal-speed evidence now uses 10 kW to 100 MW and 30 to 12 000 r\/min.<\/div>\n    <div class=\"gu-fact\"><strong>Acceptance context restored.<\/strong> Manufacturer-facility testing and agreed on-site\/routine use are distinguished.<\/div>\n    <div class=\"gu-fact\"><strong>Design conditions required.<\/strong> Speed, load, temperature and lubrication must be inside their design ranges.<\/div>\n    <div class=\"gu-fact\"><strong>Exclusions enforced.<\/strong> Torsional vibration, listed integrated\/special trains, gear clutches and PTO gears cannot pass.<\/div>\n    <div class=\"gu-fact\"><strong>Targets and directions restored.<\/strong> Housing, thrust, shaft-near-bearing and casing measurements are no longer one generic velocity value.<\/div>\n    <div class=\"gu-fact\"><strong>Transient measurements excluded.<\/strong> Run-up, run-down, initial loading and load changes cannot pass.<\/div>\n    <div class=\"gu-fact\"><strong>Specialist diagnosis separated.<\/strong> A grade or GMF peak is not converted into a tooth-fault diagnosis.<\/div>\n    <div class=\"gu-fact\"><strong>Automatic operating actions removed.<\/strong> No result authorizes continued operation, monitoring, maintenance, load reduction or shutdown.<\/div>\n    <div class=\"gu-fact\"><strong>GMF relabelled and tested.<\/strong> The retained fixed-axis formula is identified as a general engineering relation, not an ISO classification formula.<\/div>\n  <\/div><\/section>\n\n  <section class=\"gu-section\" aria-labelledby=\"gu-sources-title\"><h2 id=\"gu-sources-title\">Standard and source register<\/h2><div class=\"gu-section-body gu-source-wrap\"><table class=\"gu-table\"><thead><tr><th>ID<\/th><th>Source and lifecycle<\/th><th>Verified support<\/th><th>Not supported<\/th><\/tr><\/thead><tbody>\n    <tr id=\"source-S1\"><td>S1<\/td><td><a href=\"https:\/\/www.iso.org\/standard\/75670.html\" rel=\"noopener\" target=\"_blank\">ISO 20816-9:2020<\/a><br>Edition 1 &#8211; published June 2020 &#8211; confirmed 13 July 2026 &#8211; stage 90.93<\/td><td>Gear-unit boundary, ratings, acceptance\/agreement context, design and steady-state conditions, exclusions, measurement targets\/directions and diagnostic limitation.<\/td><td>Former numerical tables, three speed categories, planetary multiplier, bevel equivalence, exact grade semantics, boundary rules, alarms, trips or operating actions.<\/td><\/tr>\n    <tr id=\"source-S2\"><td>S2<\/td><td><a href=\"https:\/\/www.iso.org\/standard\/15866.html\" rel=\"noopener\" target=\"_blank\">ISO 8579-2:1993<\/a><br>Edition 1 &#8211; withdrawn 3 March 2016 &#8211; revised by ISO 20816-9:2020<\/td><td>Direct predecessor lifecycle and former manufacturer-facility acceptance scope.<\/td><td>No proof that a former value, grade, procedure or note is unchanged in the current document.<\/td><\/tr>\n    <tr id=\"source-S3\"><td>S3<\/td><td><a href=\"https:\/\/cdn.skfmediahub.skf.com\/api\/public\/0901d196802186cb\/pdf_preview_medium\/0901d196802186cb_pdf_preview_medium.pdf\" rel=\"noopener\" target=\"_blank\">SKF Spectrum analysis<\/a><br>2012 SKF Group &#8211; Gear Mesh Frequency section<\/td><td>For a fixed-axis gear, tooth count multiplied by its shaft speed; 50 teeth at 1 180 r\/min = 59 000 cycles\/min = 983.3 Hz.<\/td><td>Not an ISO 20816-9 grade, planetary model, acceptability rule or standalone diagnostic conclusion.<\/td><\/tr>\n  <\/tbody><\/table><\/div><\/section>\n\n  <section class=\"gu-section gu-notes\" aria-labelledby=\"gu-notes-title\"><h2 id=\"gu-notes-title\">Review notes<\/h2><div class=\"gu-section-body\">\n    <details><summary>Why does this page no longer output Grade or Zone A, B, C or D?<\/summary><p>The former values lacked a checked licensed ISO 20816-9:2020 clause\/table, exact grade\/group, complete measurement definition and verified boundary convention. A numerical classification would therefore be unsupported.<\/p><\/details>\n    <details><summary>Can any field measurement be treated as an ISO acceptance test?<\/summary><p>No. The public record centers manufacturer-facility acceptance within design ranges. On-site acceptance or routine measurements require agreement between the applicable parties.<\/p><\/details>\n    <details><summary>Can ISO 20816-9 diagnose gear tooth condition?<\/summary><p>The official abstract says its criteria have limited application to gear condition and that specialist gear-condition techniques are outside scope.<\/p><\/details>\n    <details><summary>Does the GMF calculator handle planetary gearboxes?<\/summary><p>No. The simple SKF relation here is limited to a fixed-axis gear using the tooth count and rotational speed of the same shaft. Planetary relative motion requires a different model.<\/p><\/details>\n    <details><summary>Can this page recommend continued operation, monitoring frequency, maintenance, load reduction or shutdown?<\/summary><p>No. The worksheet checks documentation completeness, and the GMF calculator returns only a kinematic frequency. Neither supplies an acceptance or operating decision.<\/p><\/details>\n  <\/div><\/section>\n  <p class=\"gu-foot\">Source access: 17 July 2026. No closed ISO clause, table, coefficient or grade boundary is copied or inferred. The former numerical classifications, speed categories, planetary multiplier, bevel equivalence, persistence and operating advice were removed because their current normative basis and complete application conditions were not verified.<\/p>\n<\/main>\n<script>\n(function(){\n'use strict';\nvar form=document.getElementById('gu-form'),result=document.getElementById('gu-result'),title=document.getElementById('gu-result-title'),summary=document.getElementById('gu-result-summary'),list=document.getElementById('gu-result-list');\nvar requiredFields=['gu-unit-id','gu-enclosure','gu-function','gu-power-scope','gu-power-record','gu-speed-scope','gu-speed-record','gu-context','gu-agreement','gu-design-range','gu-state','gu-drivetrain','gu-purpose','gu-target','gu-quantity','gu-amplitude','gu-unit','gu-value','gu-band','gu-positions','gu-chain','gu-operating-conditions','gu-source-ref','gu-site-limits','gu-report','gu-reviewer'];\nvar evidenceIds=['gu-ev-edition','gu-ev-unit','gu-ev-rating','gu-ev-context','gu-ev-operation','gu-ev-exclusions','gu-ev-target','gu-ev-diagnosis','gu-ev-measurement','gu-ev-licensed','gu-ev-site','gu-ev-review'];\nfunction labelFor(id){var label=document.querySelector('label[for=\"'+id+'\"]');return label?label.firstChild.textContent.trim():id}\nfunction addItem(text){var item=document.createElement('li');item.textContent=text;list.appendChild(item)}\nfunction clearList(){while(list.firstChild)list.removeChild(list.firstChild)}\nfunction stale(){result.className='gu-result';title.textContent='Not assessed';summary.textContent='';clearList()}\nfunction scopeConflicts(){\n  var conflicts=[],enclosure=document.getElementById('gu-enclosure').value,fn=document.getElementById('gu-function').value,power=document.getElementById('gu-power-scope').value,speed=document.getElementById('gu-speed-scope').value,context=document.getElementById('gu-context').value,agreement=document.getElementById('gu-agreement').value,design=document.getElementById('gu-design-range').value,state=document.getElementById('gu-state').value,train=document.getElementById('gu-drivetrain').value,purpose=document.getElementById('gu-purpose').value,target=document.getElementById('gu-target').value;\n  if(enclosure!=='individually-enclosed')conflicts.push('The verified public scope is for individually housed, enclosed gear units; integrated, open, other or unknown configurations require another controlled route.');\n  if(['increasing','reducing'].indexOf(fn)===-1)conflicts.push('Document a speed-increasing or speed-reducing gear unit within the licensed applicability rules.');\n  if(power!=='within')conflicts.push('The public nominal-power range is 10 kW to 100 MW; outside or unknown ratings do not pass this screening.');\n  if(speed!=='within')conflicts.push('The public nominal-speed range is 30 to 12 000 r\/min; outside or unknown ratings do not pass this screening.');\n  if(['manufacturer-acceptance','onsite-agreed','routine-agreed'].indexOf(context)===-1)conflicts.push('Use requires manufacturer-facility acceptance or a documented agreement for on-site acceptance\/routine measurements.');\n  if(context==='manufacturer-acceptance'&&agreement!=='not-required-manufacturer')conflicts.push('For manufacturer-facility acceptance, select the matching agreement-context record.');\n  if(['onsite-agreed','routine-agreed'].indexOf(context)!==-1&&agreement!=='recorded')conflicts.push('On-site acceptance or routine use requires the applicable manufacturer\/customer\/operator agreement.');\n  if(design!=='within')conflicts.push('Speed, load, temperature and lubrication must all be documented within their design ranges.');\n  if(state!=='steady')conflicts.push('Run-up, run-down, initial loading and load changes are outside the verified steady-state boundary.');\n  if(train!=='standalone')conflicts.push('The selected special, auxiliary, integrated, gear-clutch, PTO or unknown drive-train configuration is excluded or not established by the public scope.');\n  if(['acceptance-grade','routine-broadband'].indexOf(purpose)===-1)conflicts.push('Specialist gear diagnosis and automatic operating decisions are outside the verified evaluation purpose.');\n  if(['main-bearing-radial','thrust-bearing-axial','shaft-radial','casing-structural'].indexOf(target)===-1)conflicts.push('Torsional, other or unknown targets are outside the verified public broad-band target list.');\n  return conflicts;\n}\nform.addEventListener('submit',function(event){event.preventDefault();clearList();var missing=[];requiredFields.forEach(function(id){var el=document.getElementById(id),value=String(el.value).trim();if(!value||!el.validity.valid)missing.push(labelFor(id))});var unchecked=[];evidenceIds.forEach(function(id){var el=document.getElementById(id);if(!el.checked)unchecked.push(el.closest('label').querySelector('span').firstChild.textContent.trim())});var conflicts=scopeConflicts();if(missing.length||unchecked.length){result.className='gu-result gu-visible gu-incomplete';title.textContent='Documentation incomplete';summary.textContent='Complete the missing record fields and evidence categories before external review.';missing.forEach(function(text){addItem('Missing record: '+text)});unchecked.forEach(function(text){addItem('Evidence not confirmed: '+text)})}else if(conflicts.length){result.className='gu-result gu-visible gu-conflict';title.textContent='Scope, exclusion or configuration conflict';summary.textContent='Resolve the documented applicability conflict before applying any licensed evaluation procedure.';conflicts.forEach(function(text){addItem(text)})}else{result.className='gu-result gu-visible gu-ready';title.textContent='Evidence package ready for licensed external evaluation';summary.textContent='All worksheet records and evidence categories are marked present, and the public screening predicates pass. A qualified reviewer must still apply the licensed current standard, exact grade and measurement procedure, agreement, manufacturer\/site limits, process risk, protection philosophy and accountable operational procedures.'}result.scrollIntoView({block:'nearest'})});\nform.addEventListener('input',stale);form.addEventListener('change',stale);document.getElementById('gu-clear').addEventListener('click',function(){form.reset();stale();document.getElementById('gu-unit-id').focus()});\n\nvar gmfForm=document.getElementById('gu-gmf-form'),gmfOut=document.getElementById('gu-gmf-output'),gmfTitle=document.getElementById('gu-gmf-result-title'),gmfSummary=document.getElementById('gu-gmf-summary'),gmfValues=document.getElementById('gu-gmf-values');\nfunction parseLocaleDecimal(raw){var s=String(raw).trim();if(!\/^\\+?(?:\\d+(?:[.,]\\d*)?|[.,]\\d+)$\/.test(s)||(\/[.]\/.test(s)&&\/,\/.test(s)))return null;var n=Number(s.replace(',','.'));return Number.isFinite(n)?n:null}\nfunction formatValue(n){if(!Number.isFinite(n))return'-';if(Number.isInteger(n))return String(n);return n.toFixed(6).replace(\/0+$\/,'').replace(\/\\.$\/,'')}\nfunction gmfStale(){gmfOut.className='gu-gmf-output';gmfTitle.textContent='Not calculated';gmfSummary.textContent='';document.getElementById('gu-gmf-hz').textContent='-';document.getElementById('gu-gmf-cpm').textContent='-'}\ngmfForm.addEventListener('submit',function(event){event.preventDefault();var teethRaw=document.getElementById('gu-gmf-teeth').value.trim(),speedRaw=document.getElementById('gu-gmf-speed').value.trim(),teeth=\/^\\+?\\d+$\/.test(teethRaw)?Number(teethRaw):NaN,speed=parseLocaleDecimal(speedRaw);if(!Number.isSafeInteger(teeth)||teeth<=0||speed===null||speed<=0||!Number.isFinite(teeth*speed)){gmfOut.className='gu-gmf-output gu-visible gu-error';gmfTitle.textContent='Invalid GMF input';gmfSummary.textContent='Enter a positive whole tooth count and a positive finite shaft speed using either a decimal point or decimal comma. 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