Question

What is the difference between CMM and UMM?

(a) UMM can’t inspect geometrical features while CMM does it

(b) CMM is more accurate than UMM but can’t inspect geometrical features

(c) UMM is more accurate than CMM and can inspect geometrical features

(d) CMM is more accurate than UMM but can’t inspect geometrical features

This question was posed to me in final exam.

My question is based upon Universal Measuring Machine topic in portion Measuring Machines & Total Quality Management of Engineering Metrology

Answer 1

The correct answer is (c) UMM is more accurate than CMM and can inspect geometrical features

Explanation: Co-ordinate measuring machine doesn’t inspect the geometric features of the part but universal measuring machine does it. Co-ordinate measuring machine is less accurate than a universal measuring machine.