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A spur gear has pitch circle diameter D and number of teeth T. The circular pitch of the gear is

1. πD / T
2. T / D
3. D / T
4. 2πD / T

Correct answer: πD / T

Solution

The circular pitch is defined as the distance from one point on a tooth to the corresponding point on the next tooth, which is calculated by dividing the circumference of the pitch circle (πD) by the number of teeth (T). This gives the formula πD / T.

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