Two spiral gears A and B have 45 and 15 teeth at spiral angles of (20^{circ}) and

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Two spiral gears A and B have 45 and 15 teeth at spiral angles of \(20^{\circ}\) and \(50^{\circ}\) respectively. Both gears are of same hand. A is \(150 \mathrm{~mm}\) in diameter. Find the centre distance between the shafts and the angle between the shafts. If the teeth are of \(20^{\circ}\) involute form and coefficient of friction is 0.08 , find the efficiency if \(\mathrm{A}\) is the driver.

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