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How Flatness of clamping surface of the base test is performed?

(a) By placing a straight edge on one gauge block

(b) By placing a straight edge on four gauge blocks

(c) By placing a straight edge on two gauge blocks

(d) By placing a straight edge on three gauge blocks

This question was posed to me during an internship interview.

The query is from Alignment Tests on Pillar Type Drilling Machine in chapter Machine Tool Metrology of Engineering Metrology

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Correct choice is (c) By placing a straight edge on two gauge blocks

Explanation: The Flatness of clamping surface test is performed by placing a straight edge on two gauge blocks on the base plate in various positions and the error is noted down by inserting the feeler gauges.

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