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Which of the following is used to measure an internal taper in a blind hole?

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Which of the following is used to measure an internal taper in a blind hole?

(a) One pin

(b) Two balls

(c) Single ball

(d) Two pins

I have been asked this question in a job interview.

Query is from Measure an Internal Taper in Blind Hole topic in section Miscellaneous Measurements (EM) of Engineering Metrology

1 Answer

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Correct choice is (b) Two balls

To elaborate: For this method of measurement of internal taper of blind holes, generally two steel balls are used. These balls are generally made up of steel.

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