A vernier or dial bore gage directly measures a bore. It has 3 symmetrical anvils protruding from the gauge body that are linked to the micrometer mechanism. With the rotation of the knob, the anvils move in and out with respect to the measurement. To increase reliability and take the feel out of the device, the knob has a slipping mechanism.
Do You Know How To Set A Dial Bore Gage?
03
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