Cool. I'm mostly curious about the radial shape change of the bellows. Not so much the linear change which is pretty straightforward.
@bshand, the radial movement is more straightforward than you'd think
The blue 14mm dimension is driven by the assembly and causes the sketch and silicone bellow to "collapse". I needed to add a range for the driving variable to prevent the sketch from completely flattening, other than that there's nothing fancy here. Admittedly, this doesn't really stretch, it just flattens out, but the representation is close enough to create a plausible illusion.
I do not have a video to send. While looking at the previous video I send to Solid Edge... the center motor does rotate. (Motor does not collapse) With the motor rotating... the outer ring has those extruded tips inside. Those are the ones that are to compress inside the ring in and out.
Greg / @PO_LC,
the part that changes shape doesn't have to be the rotating one. The rotation angle of the motor (rotor) can drive the features on the stationary part. In your case the casing would be an ordered adjustable part. If you need more help with this I can try a quick mockup if I have some spare time.
There are some solutions for this. I've used inter-part copy and Boolean operation, but the key thing is the "Active level" at animation. @hjoy 's solution is perfect too.
Here is a video about steps: