Each rotation of the disc makes the frame move forward
and backward by a range equal to the disc’s diameter.
The Scotch yoke’s range of movement is equal to the disc’s
diameter, which means that it transforms the movement
more efficiently than an eccentric mechanism would. We can
increase the range by using a bigger disc and increasing the
size of the slot inside the frame accordingly. The height of
the slot has to be at least equal to the disc’s diameter, which
also means that the yoke’s movement range is the minimum
height of its slot.