The nominal sizes of a GO/NO-GO plug gauge to inspect a 30±0.18mm diameter hole is to be designed. The wear allowance is 3% of the entire tolerance band for the inspected feature.
The nominal size of the NO-GO gauge is (mm)
A
30.1692
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B
29.8308
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C
30.18
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D
29.82
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Solution
The correct option is C 30.18 NO-GO gauge will inspect the maximum hole diameter
=30.00+0.18=30.18mm
No wear allowance is added because this gauge should not fit in the hole and wear away.