Question

What is the provision for wear of Go gauges is made by?

(a) A margin greater than maximum metal limit of work

(b) A margin greater than tolerance zone of gauge

(c) A margin lesser than maximum metal limit of work

(d) A margin between tolerance zone of gauge and maximum metal limit of work

The question was asked in a national level competition.

This interesting question is from Gauge Wear in portion Metrology of Screw Thread, Gauges for ISO Metric Screw Threads of Engineering Metrology

Answer 1

Correct answer is (d) A margin between tolerance zone of gauge and maximum metal limit of work

To explain I would say: ‘Go’ gauges provision for wear is made by the introduction of a margin between the maximum metal limit of the work and tolerance zone for the gauge. Wear should not be permitted beyond the maximum metal limit of the work, when the limit is of critical importance.