Dial indicator also can be called as dial gauge, comparator, analog indicator, clock or others. Dial indicator is a general length measuring tool made of precision rack and pinion mechanism. The working principle is amplification the small linear movement of the measuring rod through the gear transmission and turns it into the rotation of the pointer on the dial, so as to realize the reading of the measurement.
Dial indicators are widely in the mechanical and industrial sectors to verify the flatness and alignment of various parts and workpieces. It is used to measure the workpiece alignment, squareness, roundness, parallelism, cylindricity etc. A dial indicator is useless by itself and needs to be attached to a fixed base or a stand so that the tip of the spindle is at a specific height against either a master or reference part. An operator then lifts the spindle with a lever, slides the part to be measured under the spindle and lowers the spindle back down. If the part length is different from the reference, the operator will see the deviation on the indicator's dial. Seeing this part deviation is what reading the indicator is all about.
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