GO and NO-GO plug gauges are to be designed for a hole

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GO and NO-GO plug gauges are to be designed for a hole 20.000^{+0.010^+0.050} mm. Gauge tolerances can be taken as 10% of the hole tolerance. Following ISO system of gauge design, sizes of GO and NO-GO gauge will be respectively.

1. 20.010 mm and 20.050 mm
2. 20.014 mm and 20.046 mm
3. 20.006 mm and 20.054 mm
4. 20.014 mm and 20.054 mm

Correct Option: D

Dimension of hole = 20.000^{+0.050^+0.010}
∴ Tolerance = 20.05 – 20.01 = 0.04 mm

Gauge tolerance = 0.04 ×	10	= 0.004 mm
	100

Size of NO – GO gauge = Maximum limit – gauge tolerance
= 20.05 – 0.004 = 20.046