3. Operation at normal (reference) center distance a
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External spur gear
Consider figure 7 . We have shown a normal gear on the left, and a corrected gear with no variation in center distance on the right.
The common center distance is the reference center distance a; the reference pitch circles are merged with the operating pitch circles; the operating pressure angle corresponds to the pressure angle α 0 of the generating rack. On the primitive circles, the pinion and wheel teeth have the same pitch: π m 0 .
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Operation at normal (reference) center distance a
Operation at a 9 centre distance other than a
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