Two involute gears in mesh have $20$ pressure angle. The gear ratio is $3$ and the number of teeth on pinion is $24.$ The teeth have a module of $6$ mm $.$ The pitch line velocity is $1\mathrm{.}5\frac{m}{s}$ and the addendum is equal to the module. Determine $(i)$ the angle of action of the pinion, and $($ii$)$ the maximum velocity of sliding.

$8$

Or