Pin in a Curved-Slot

Curved Slot Cam-backCurved Slot Cam-forward

A Pin-in-a-Curved-Slot is frequently used in a mechanism to 'change-over' between product sizes.

Why is the slot 'curved'?

At the 'Back Position', the image to the left, we make an adjustment by moving the Pin-Joint along the curved slot from 1s-red to 2s

As you move the Pin along the curved slot from 1s-red to 2s, the tool moves to the left, from 3s to 4s .

At the 'Forward Position', the image to the right, you can see that the same adjustment does not change the position of the tool.

Therefore, when you make an adjustment from 1s-red to 2s, you can increase the length of the stroke, but one end of the stroke does not changed.

How does this work? What is the radius of the Curved Slot? Where is the Curved Slot in the Orange Part?

You would move the slider to the 'Design Position'. This is where you want the Tool to remain not to move when you move the Pin-Joint in the Curved Slot.

Then you would design a Connecting Link and a Curved Slot to:

make the connecting link equal to the radius of the arc
put the centre-Point of the arc that describes the curved slot so that it coincides with the Pin-Joint in the Tool at the design position.

If you need to know how to model this configuration in MechDesigner, it is really quite easy. Please email.

Tutorial and Reference Help Files for MechDesigner and MotionDesigner 13.2 + © Machine, Mechanism, Motion and Cam Design Software by PSMotion Ltd