Spiral Motion

[ManikantaAthukuri]

Hello

I have started modelling a 3-jaw chuck. The motion between the jaw and the spiral plate is a spiral motion.

How can we achieve the spiral motion in Fusion-360. For now, I have made a motion link between the spiral plate and jaw.

If you know the solution please do share. It will be helpful.

I am attaching the .f3z file for reference

[davebYYPCU · Accepted solution]

It appears to be working, other than the rest position, or closed distance adjustment.

I have not studied the model, as what I was going to say has been done.

Might help....

[ManikantaAthukuri · Accepted solution]

Thanks for the reply. Yes, I have finished motion by making a motion link between the joints. But it is not accurate. The rotating motion and the sliding motion are not in sync.

[davebYYPCU · Accepted solution]

Well I got to the motion link, you have 15mm slide for one revolve, you should use the pitch of the spiral thread, if it is not 15mm.  The tooth spacing is 6+ mm, but as stated not checked - if it is a single or triple start spiral coil, or whether the chuck key is / would be functional.

Might help....

[ManikantaAthukuri]

Ok, thanks for the update. I will try to adjust the measurements as you stated

[davebYYPCU · Accepted solution]

How did you go?

I am closer to "ëxpected"

Pitch of the single start spiral is 6mm.

I edited the Motion Links to 360 deg = 6mm. 

(not sure of your formula in this area, but one turn disc is 6mm in the jaw.)

I also gave more jaw travel (-45 to 15) in 2 of them and changed the other one to -12 (so 18mm inwards on all).

and found this .... that you may know how to re-align the 2 that are too wide. (1 tooth out -> in)

(PS Been there done that in real life) 

Might help....

[ManikantaAthukuri]

Yes by adjusting the rest positions We can get almost "expected" motion. I tried it in the motion study. So It is closer to the needed motion. Thanks for helping.