Question

Which of the following is not related to the geometrical accuracy of CMM?

(a) Straightness of axes

(b) Squareness of axes

(c) Position accuracy

(d) Axial length measuring accuracy

The question was posed to me at a job interview.

This interesting question is from Coordinate Measuring Machines in section Machine Tool Metrology of Engineering Metrology

Answer 1

Correct answer is (d) Axial length measuring accuracy

The explanation: Geometrical accuracy concerned with the straightness of axes, position accuracy and squareness of axes while total measuring accuracy concerns volumetric length measuring accuracy and axial length measuring accuracy.