Gears have a standardised geometry. Their measurement is according to DIN 3962. Very small modules (approx. 0.03) can occur, especially with plastic gears. Profile form deviation, flank line deviation and the pitch are measured. For micro gears, the tolerances are in the range of a few µm. The measuring time plays a subordinate role. A difficulty for the mostly contact measurement is the rigid holding of the workpieces.
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