Question: 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.

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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