Question

For testing squareness of spindle axis with table, when was reading taken down?

(a) At every 90° rotation of spindle

(b) At every 180° rotation of spindle

(c) At every 60° rotation of spindle

(d) At every 120° rotation of spindle

I have been asked this question in an interview.

This is a very interesting question from Alignment Tests on Pillar Type Drilling Machine topic in division Machine Tool Metrology of Engineering Metrology

Answer 1

Correct option is (b) At every 180° rotation of spindle

For explanation I would say: The dial indicator is fixed in the spindle tapered hole and its feeler touch the straight edge At A and then, reading is noted down. The spindle is rotated by 180° so that the feeler touches at point A’ and again reading is noted down.