Question

Which of the following is true for parallel screw plug gauges?

(a) The minor diameter is measured by making a measurement on a diameter measuring machine between the flat ends of Vees

(b) The flank angle is measured by making a measurement on a diameter measuring machine between the flat ends of Vees

(c) The effective diameter is measured by making a measurement on a diameter measuring machine between the flat ends of Vees

(d) Pitch is measured by making a measurement on a diameter measuring machine between the flat ends of Vees

The question was asked in an interview for job.

My doubt is from Measurements of Limit Gauges topic in portion Testing and Calibration of Gauges and Dynamic Measurement of Engineering Metrology

Answer 1

Correct choice is (a) The minor diameter is measured by making a measurement on a diameter measuring machine between the flat ends of Vees

Easy explanation: The major diameter is obtained on the diameter measuring machine which is standardised in a similar way as bench micrometer. The minor diameter is measured on a diameter measuring machine between the flat ends of Vees which are placed in the thread groove on the gauge’s opposite sides.