Question

What is black lash error? How is it avoided?​

Answer 1

1. In case of micrometre screw gauge the backlash error is the error in which measurement due to backlash of the internal gears.In a pair of machine gears the distance between two space and tooth thickness is called as backlash.

2. Backlash error occurs in screw gauge, when we try to rotate the screw very fast to reading, toavoid this we should rotate the screw slowly in only one direction. Backlash should be avoided in case of measuring instruments like lead screw, screw gauge etc.

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Answer 2

Answer:

Black lash error in the observation caused to wear and tear of thread of the screw observed while reversing the direction of rotation of the thimble where the tip of the screw does not stat moving in the opposite direction at once but remains stationary for a part of rotation.

Explanation:

Avoid black lash error =while taking measurement screw should be rotated in one direction