The Ro-Tap has specifications of 280 rpm +/- 10 sieve rotations and there are 150 taps/minute +/- 5 taps. The most common used sprocket has 14 teeth and the timing belt pulley has 87 teeth. By taking the actual rmp of the motor and multiplying by 14/87, you should get the actual rpm of the Ro-Tap.
I.E.! 1750 x 14/87 = 281.6 = 282 rpm
There are 29 teeth on the timing belt pulley hub and 54 teeth on the cam gear.
282 x 29/54 = 151 taps per minute
R-30015 timing belt pulley w/hub
R-20039 cam gear
R-10070 14-tooth sprocket
