A pair of involute profile spur gears is to give a speed ratio of 3. The arc

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A pair of involute profile spur gears is to give a speed ratio of 3. The arc of approach is not to be less than the circular pitch. The pressure angle is \(20^{\circ}\) and pinion is the driver. The module is \(4 \mathrm{~mm}\). Calculate

(a) minimum number of teeth on gear, and

(b) addendum of gear wheel.

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