Question

Which of the following is not true about the testing of eccentricity of external diameter?

(a) Locating shoulder is fixed

(b) Feeler is placed on the surface of shoulder

(c) Vibrations are produced due to eccentricity

(d) Cutter will float sideways due to eccentricity

This question was posed to me in my homework.

Query is from Alignment Tests on Milling Machine in chapter Machine Tool Metrology of Engineering Metrology

Answer 1

Right choice is (a) Locating shoulder is fixed

To explain I would say: The feeler is placed on the shoulder surface. The locating shoulder is rotated and a deviation is noted. It is due to eccentricity of the spindle in the hole in which it fits. Vibrations are produced due to eccentricity and the cutter will float sideways and cut oversize, or undersize.