Input: pink gear shaft.
Its number of remained teeth Z1c = 18
Its number of teeth (teeth-completed) Z1 = 40
Its number of cut-off teeth Z1f = Z1 – Z1c = 22
The green gear (teeth-completed) has Z2 = 20 teeth.
When the input makes 2 revolutions, the green makes 1 revolution and pause during ½ revolution of the input.
Glass disk is fixed to the green shaft. Blue circular slider is fixed to the disk by red screw (pushing on bottom of the dovetail groove). Violet slider reciprocates with dwells at one end (right or left) of its stroke.
The video shows how to change dwell position (from right end to left one) by adjusting position of the circular slider on the disk.
It is possible to set dwell position of the violet slider anywhere on its stroke.