Question

Which of the following is true for testing parallelism between two trajectories?

(a) Dial indicator is attached on a fixed machine component

(b) Moving parts are moving in different directions in testing the parallelism

(c) The two parts are moved by the same amount

(d) Parts are moving together

I got this question by my college director while I was bunking the class.

My enquiry is from Parallelism, Equidistance and Coincidence in division Straightness, Flatness, Squareness, Parallelism, Circularity and Rotation of Engineering Metrology

Answer 1

The correct choice is (c) The two parts are moved by the same amount

The explanation is: The dial indicator is attached to one of the moving machine components and its feeler rests against a specified point on the other moving part. The two parts are moved together by the same amount in the same direction and the variations in the reading are noted.