The minimum number of teeth on the pinion to operate without

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The minimum number of teeth on the pinion to operate without interference in standard full height involute teeth gear mechanism with 20° pressure angle is

1. 14
2. 12
3. 18
4. 32

Correct Option: C

Z_min = Minimum number of teeth on pinion to avoid interference.

Z_min =	2 × A_w	=	2 × 1	= 17.09 ≃ 18 teeth
	sin²Φ		sin²20°