Scotch-Yoke Mechanism The Scotch-Yoke also known as slotted link mechanism, is a reciprocating motion mechanism, capable of converting the linear motion of a slider into rotational motion , or vice versa directly depending on the application. A Scotch-yoke mechanism has a yoke frame with opposed parallel tracks engaged by rollers shown in form of block assembly, arranged in order to transmit power between a rotating crankshaft attached to crankpin which are mounted on block assembly and oppositely directed pistons or other reciprocating part mounted on the yoke frame, which move linearly in line with the reciprocating-axis. The piston or other reciprocating component can be coupled directly with sliding yoke and slot engaged with a pin and the rotating par t. The motion of the piston is simple harmonic motion , taking in consideration that it has a constant amplitude, frequency, given at constant rotational speed . Understanding Better With An Example : - Scotc