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If work tolerance is less than 0.09mm, then how much wear allowance is given to Go gauge?

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+1 vote
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in Engineering Metrology by (829k points)
If work tolerance is less than 0.09mm, then how much wear allowance is given to Go gauge?

(a) 5% gauge tolerance

(b) No allowance

(c) 1% gauge tolerance

(d) 2.5% gauge tolerance

I have been asked this question in exam.

This intriguing question originated from Gauge Wear in chapter Metrology of Screw Thread, Gauges for ISO Metric Screw Threads of Engineering Metrology

1 Answer

+1 vote
by (1.4m points)
Correct choice is (b) No allowance

To explain: When work tolerance is less than 0.09 mm there is no need of giving allowance for wear. 10% gauge tolerance is given only on ‘Go’ gauge for wear if work tolerance is more than 0.09 mm.

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