| 摘要 |
For quality control inspection of a rack-type gear to check for deviations of the rack from specified pitch and gauge, the rack is advanced a measured distance in meshing engagement with a pivotally mounted ultra precision pinion gear cut to the specified pitch. The resultant rotation of the pinion is converted by an encoder to a digital count which, in turn, is compared against the measured distance through which the rack was moved to determine the accuracy or lack of accuracy of the pitch of the rack. A detector senses any pivotal movement of the pinion as the rack is advanced to sense differences in the gauge of the rack along its length.
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