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Which material is used for the base in three dimensional measuring machines?

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in Engineering Metrology by (829k points)
Which material is used for the base in three dimensional measuring machines?

(a) Steel

(b) Aluminium

(c) Granite

(d) Lead

This question was posed to me during a job interview.

Question is from Three Dimensional Measuring Machine topic in division Measuring Machines & Total Quality Management of Engineering Metrology

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The correct choice is (c) Granite

For explanation: The machine base and metrology system should be made independent of each other. The external forces upon the metrology system should be constant. Granite is chosen for building the machine base because of low coefficient of expansion.

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