Question

Which of the following is done for testing the true running of headstock centre?

(a) Feeler of dial indicator is pressed perpendicular to the taper surface

(b) Feeler of dial indicator is pressed parallel to the taper surface of cent

(c) Feeler of dial indicator is pressed at acute angle to the taper surface of cent

(d) Feeler of dial indicator is pressed at obtuse angle to the taper surface of cent

This question was posed to me in my homework.

The doubt is from Alignment Tests on Lathe topic in division Machine Tool Metrology of Engineering Metrology

Answer 1

Right answer is (a) Feeler of dial indicator is pressed perpendicular to the taper surface

For explanation: For testing this error of true running of headstock centre, the feeler of the dial indicator is pressed perpendicular to the centre taper surface, and the spindle is then rotated. The deviation which is indicated by the dial gauge gives the trueness of the centre.