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What is the effect of lack of true spindle rotation in accurate worm and gear rotary table?

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What is the effect of lack of true spindle rotation in accurate worm and gear rotary table?

(a) Angular error

(b) Centre distance error

(c) Both angular and centre distance error

(d) Decrease repeatability

The question was asked in my homework.

The query is from Rotary Tables topic in portion Angular Measurement and Circular Division of Engineering Metrology

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Correct choice is (c) Both angular and centre distance error

To explain: Lack of true spindle rotation in accurate worm and gear rotary table results in both angular error and centre distance error. Rotary table has the advantage of trouble free operation and good repeatability.

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