Which measuring method is used to examine the concentric alignment of a chuck mounted on a back plate?
Using Dial indicator
Checking concentricity means measuring how much a surface runs out (wobbles) as the spindle is rotated.
A dial indicator, with its plunger set against the chuck's location surface, reads the total indicated run-out directly as the chuck is turned, revealing any eccentricity to a fraction of a millimetre.
Feeler gauges measure gaps, calipers measure size, and the eye cannot resolve such small run-out, so none of these can verify concentric alignment.
Hence, a dial indicator is used.
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