Question

Which of the following is true for plug gauges?

(a) Size difference between ‘Go’ and ‘No Go’ plug gauges is greater than the tolerance of tested shaft or hole

(b) Size difference between ‘Go’ and ‘No Go’ plug gauges is Equal to the tolerance of tested shaft or hole

(c) Size difference between ‘Go’ and ‘No Go’ plug gauges is less than the tolerance of tested shaft or hole

(d) Size difference between ‘Go’ and ‘No Go’ plug gauges more or less than the tolerance of tested shaft or hole

The question was posed to me in an interview for internship.

This is a very interesting question from Gauge Design topic in chapter Limits, Fits and Gauges of Engineering Metrology

Answer 1

Correct option is (b) Size difference between ‘Go’ and ‘No Go’ plug gauges is Equal to the tolerance of tested shaft or hole

For explanation: In case of standard gauges, size difference between ‘Go’ and ‘No Go’ plug and snap gauges is equal to tolerance. To maintain size and adequate functioning of snap gauges, robustness and rigidity are the main features.