Two 20° involute spur gears have a module of 12 mm. The addendum is equal to 1.5 module. If the larger gear has 40 teeth and the pinion has 20 teeth, find the pressure angle at which interference can be avoided.

Two 20° involute spur gears have a module of 12 mm. The addendum is

1.	Two 20° involute spur gears have a module of 12 mm. The addendum is equal to 1.5 module. If the larger gear has 40 teeth and the pinion has 20 teeth, find the pressure angle at which interference can be avoided.
A.	20.66°
B.	21.96°
C.	22.23°
D.	21.24°
Answer» B. 21.96°

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