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What does it mean to measure the rod diameter of the gear? How is it calculated? Are the calculation formulas of standard gears and helical gears the same?
The diameter of measuring rod of gear is the diameter of measuring rod (two measuring rods with the same diameter) when measuring the span (m value) of gear.

The calculation method (straight teeth) can refer to the involute spline standard GB/T3478.6, and the principle of the calculation formula is the same.

The span calculation method of helical cylindrical gear and straight cylindrical gear is "basically the same", and some of them need end face parameters.

The formula is too complicated to write here. Please understand.

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