Широкий ассортимент подшипников ведущих мировых производителей. SKF, FAG, INA, NSK, TIMKEN
Направляющие, каретки, шарико-винтовые передачи для станков и автоматизации
Изготовление нестандартных деталей и узлов по чертежам заказчика
Консультации инженеров, помощь в подборе аналогов, расчёт ресурса
На подшипники NSK
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Поставляем оригинальные комплектующие
Производим аналоги под брендом INNER
• Accuracy grades: 0 (highest) to 12 (lowest) • Tolerance formula: TW = fpt × √(0.25 + 0.75×k) • fpt depends on module and accuracy grade • Tolerance positions: JS (symmetric), K/M (minus), H/G (plus)
• ISO 1328-1:2013: Accuracy system • ISO 21771:2007: Span measurement • ISO 1122-1: Vocabulary • ISO 53: Cylindrical gears for general use
Note: This calculator uses simplified formulas that provide approximate results: • The k calculation is simplified (exact ISO formula is more complex) • Tolerance values are approximated (exact ISO 1328-1 uses diameter-dependent formulas) • Ball/pin measurement correction is simplified • For production use, verify with official standards or certified software
• For module m > 1 mm use vernier caliper • For high accuracy use gear tooth vernier or CMM • Measure at 3-4 positions around circumference • Consider temperature compensation (20°C reference) • Profile shift x affects tooth thickness • For ball/pin measurement: contact should be on involute ⚠️ Important: For production or quality control, always verify calculations with: • Official ISO standards documentation • Certified gear measurement software • Calibrated measurement equipment
* Values shown for module m=1 and pressure angle α=20°. Multiply by your gear's module for actual span measurement.
Gear span measurement (also known as span over teeth or base tangent length) is the distance between two parallel planes tangent to opposite tooth flanks. This gear tooth span measurement is one of the primary methods for quality control in gear manufacturing.
The measurement of span over teeth allows manufacturers to verify tooth thickness and detect deviations from nominal dimensions without measuring the complete tooth profile. This makes span measurement calculation an essential tool in gear inspection.
The gear span calculation is performed using the following formula:
Module m = 2 mm, Number of teeth z = 20, Pressure angle α = 20°, Profile shift x = 0
Therefore, the gear tooth span measurement is 15.326 mm. This span measurement calculation provides the exact dimension needed for quality control inspection.
To measure span over gear teeth, the following instruments are commonly used:
When measuring gear span, place the measuring instrument's anvils on opposite tooth flanks, spanning the calculated number of teeth k. Take measurements at several positions around the gear circumference to ensure accuracy.
Our gear span measurement calculator provides instant calculation of span over teeth for various gear types, including spur and helical gears. The span calculator automatically updates results as you modify parameters, making it ideal for quick verification during design or inspection processes.
This online gear span calculator follows ISO standards and can be used for preliminary calculations in gear design and quality control. Whether you need to calculate span measurement for a new design or verify existing gears, this tool provides accurate results based on standard formulas.
Gear tooth span calculation is governed by international standards that ensure consistency in measurement and manufacturing:
These standards provide comprehensive gear span tables and formulas for accurate span measurement calculation across different gear specifications and quality grades.
This gear span measurement calculator is provided "as is" and is intended for informational and educational purposes only. The author assumes no responsibility for any direct or indirect losses arising from the use of this calculator.
Calculations are approximate and based on simplified formulas. For production purposes and quality control, always refer to official ISO standards and certified software. Always verify calculation results using alternative methods and professional judgment.
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