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In testing of the true running of spindle taper, what is the position of dial indicator?

(a) Dial indicator is fixed on the base

(b) Dial indicator is placed on the table

(c) Dial indicator is fixed on the sleeve

(d) Dial indicator is fixed on the table

The question was posed to me in a national level competition.

Origin of the question is Alignment Tests on Pillar Type Drilling Machine in portion Machine Tool Metrology of Engineering Metrology

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Right answer is (d) Dial indicator is fixed on the table

Explanation: For true running of spindle taper test, the test mandrel is placed in the tapered hole of spindle and a dial indicator is fixed on the table and its feeler made to scan the mandrel.

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