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Furthermore, the wear of the threading tools will not impair the diametral fit of the work, while the permissible limit of error in diameter will be increased.

The circumferential pitch is of course got by dividing the diametral pitch by π.

If an error of concavity presents itself the process of polishing is gone over again, using short diametral strokes.

Supposing you wanted to know the number of teeth in a gear where the pitch diameter and the diametral pitch are given.

The astrolabe, which consists of a circle divided into degrees, with a rotating diametral arm for sighting purposes, embodies their essential principle.