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Which of the following is true for accurate worm and gear rotary tables?

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Which of the following is true for accurate worm and gear rotary tables?

(a) Bidirectional approach is used for setting

(b) Can be used for inspection of angles

(c) Can’t be used for generation of angles

(d) Worm and gear are highly accurate

I got this question during an online interview.

My question comes from Rotary Tables in section Angular Measurement and Circular Division of Engineering Metrology

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The correct option is (b) Can be used for inspection of angles

Easy explanation: A unidirectional approach is used in accurate worm and gear type table for setting to take care of unavoidable presence of backlash. The accurate worm and gear has an advantage for the inspection and generation of angles.

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