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What is the cause of translational errors in CMM?

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What is the cause of translational errors in CMM?

(a) Error in scale division

(b) Error in straightness

(c) Twisting error

(d) Roll error

This question was addressed to me in class test.

This intriguing question comes from Coordinate Measuring Machines in chapter Machine Tool Metrology of Engineering Metrology

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The correct option is (b) Error in straightness

Explanation: Translational errors result from errors in the division of scale and straightness error perpendicular to the corresponding axis direction. Errors in scale division are known as positional errors. Error in straightness is the cause of translational errors.

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