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What is the purpose of locating cylinder in the test of the true running of the main spindle?

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What is the purpose of locating cylinder in the test of the true running of the main spindle?

(a) To locate the chuck

(b) To locate the main spindle

(c) To locate the feeler

(d) To level the machine

The question was posed to me in unit test.

Query is from Alignment Tests on Lathe topic in portion Machine Tool Metrology of Engineering Metrology

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Correct choice is (a) To locate the chuck

To explain I would say: Locating cylinder is provided to locate the face plate or chuck. Threads get worn out soon thus, locating surface can not be threaded one. Locating surface should be cylindrical and must run truly.

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