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How the final unresolved error can be overcome in a mechanical cam compensated rotary table?

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How the final unresolved error can be overcome in a mechanical cam compensated rotary table?

(a) By the perfection of gear

(b) By compensation

(c) There is no unresolved final error

(d) Perfection of gear is the better in this case than compensation

This question was posed to me during an interview.

Query is from Rotary Tables in division Angular Measurement and Circular Division of Engineering Metrology

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Best answer
Correct choice is (b) By compensation

To explain I would say: In mechanical cam-compensated type rotary table, accuracy depends upon the accuracy of the worm and gear. Compensation is used to overcome the final unresolved error, rather than perfection of the gear.

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