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Which drive is used in slide drive system present in three dimensional measuring machines?

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Which drive is used in slide drive system present in three dimensional measuring machines?

(a) Rack and pinion drive without gear teeth

(b) Rack and pinion drive with gear teeth

(c) Worm and worm gear drive without teeth

(d) Worm and worm gear drive with teeth

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I'd like to ask this question from Three Dimensional Measuring Machine topic in division Measuring Machines & Total Quality Management of Engineering Metrology

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Correct choice is (a) Rack and pinion drive without gear teeth

Easy explanation: A portion of each bearing is evacuated and acts like a vacuum chuck to hold the bearing. The bearing surface balance provides lift. The slide drive system used in three dimensional measuring machines can be considered as a rack and pinion drive without gear teeth.

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