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What is the length of mandrel which is used to test true running of internal taper on milling machine?

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What is the length of mandrel which is used to test true running of internal taper on milling machine?

(a) 50 mm

(b) 100 mm

(c) 300 mm

(d) 1000 mm

This question was addressed to me during an online interview.

The above asked question is from Alignment Tests on Milling Machine in division Machine Tool Metrology of Engineering Metrology

1 Answer

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Best answer
Correct answer is (c) 300 mm

The best I can explain: To test true running of internal taper, a mandrel of 300 mm length is fixed in the taper of spindle. A dial gauge is set on the table of machine and feeler is adjusted to touch the lower surface of this mandrel.

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