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  1. DocSergey

    Fine pitch spur gears.

    Can anyone tell me which standard for fine pitched gears are still active and commonly used please? DIN 58400/ 58405/ 58412 are withdrawn, there is no ISO standard for gears with module below 1 mm (iso 1328-2 defines total radial composite tolerance for module from 0,2 up to 10, but runout is...
  2. DocSergey

    Gear drives requirements

    Maybe someone knows gear drives (or speed reducers, or gearboxes) such as Nabtesco, Sumitomo . All their output parameters are similar, i mean torque rating, accelerating torque/ decelerating torque 250%, peak torque 500% and rating life about 6000 hours. Who knows standards (international or...
  3. DocSergey

    Span deviation / Spur gear / ISO 1328

    thank u mfgenggear, but it is kind of obviously:) what i meant before is that i can't find information about how to calculate upper and lower deviation for span measurement. ISO 21771 describes how to calculate it, but there are some stupid things: for example 2 formulas from page 67 (BS ISO...
  4. DocSergey

    Span deviation / Spur gear / ISO 1328

    Please, help me:) I'm from Russia and everybody here is working according to GOST standard, but right now i need to build a spur gear according to ISO 1328 and i've got one problem: i can't find information about span deviation, i mean minimum and maximum. For example in GearTrax (gear...
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