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Why can backlash occur, and how is it avoided?

Here is a concise guide to understanding and using a micrometer screw gauge.

, the sleeve shows 6.5 mm and the thimble shows division 42. If LC = 0.01 mm and zero error = –0.03 mm, what is the corrected reading? Solution: Observed = 6.5 + (42×0.01) = 6.92 mm. Corrected = 6.92 – (–0.03) = 6.95 mm.