Question

What is the formula for the internal tapered angle of blind hole?

(a) Sin A/2 = (l1-l2)/2h

(b) Cot A/2 = (l1-l2)/2h

(c) Cos A/2 = (l1-l2)/2h

(d) Tan A/2 = (l1-l2)/2h

This question was addressed to me in an internship interview.

My question is based upon Measure an Internal Taper in Blind Hole topic in chapter Miscellaneous Measurements (EM) of Engineering Metrology

Answer 1

Right option is (d) Tan A/2 = (l1-l2)/2h

The explanation is: Tan A/2 = (l1-l2)/2h or A = 2 tan -1(l1-l2)/2h is the formula to measure the internal tapered angle of the blind hole where  (l1-l2) is the different in length of slip gauges and h is the height of slip gauges upon which balls are placed.