How does a dial caliper work?

How does a dial caliper work?

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Dial calipers use a rack and pinion mechanism system, which transfers the linear movement of the jaws of the caliper to the rotary motion of the dial indicator. Dial calipers use a rack and pinion mechanism system, which transfers the linear movement of the jaws of the caliper to the rotary motion of the dial indicator.
Inside the dial there is a train of gears which mechanically drive the dial indicator needle when the distance between the jaws of the caliper is adjusted. Inside the dial there is a train of gears which mechanically drive the dial indicator needle when the distance between the jaws of the caliper is adjusted.
The dial is engaged with a toothed gear rack that runs along the length of the main beam. The dial is engaged with a toothed gear rack that runs along the length of the main beam.
As the jaws open or close, the pinions inside the dial travel down this rack. Small movements of the jaws are amplified and transformed into larger movements that are indicated on the dial. As the jaws open or close, the pinions inside the dial travel down this rack.

Small movements of the jaws are amplified and transformed into larger movements that are indicated on the dial.