A crank and slider mechanism is made up of three important parts. These parts include:
1. The crank which is the rotating disc.
2. The slider which slides inside the tube.
3. The connecting rod which joins the parts together.

How does this mechanism work?

When the slider moves to the left, the connecting rod push the wheel around for the first 180 degrees of wheel rotation. When the slider begins to move back into the tube, the connecting rod pulls the wheel around to complete the rotation.