Helix with Variable pitch

[matthewph]

Hi there, 

I want to create a helix that starts with a small pitch and gradually changes into a larger one. Something equivalent to the pic below.

I have looked through the various forum question threads to find a solution to this problem, I see this topic was last visited in 2020 and I don't see a definitive solution just yet. Has fusion 360 included this as a feature tool yet? If not have you got any suggestions.

 

[kellings]

Hi @matthewph I don't believe there is currently anyway to do this with the coil command. There is a helix generator in the App store, but I'm not sure if that could pull it off either. Might be worth a look. 

[dan.banach · Accepted solution]

To add onto Kevin's idea. Have you tried creating 2 coil features, and then use the Combine tool to remove the coil boids from a cylindrical body? The tangency be be the hard part but this should get you close.

-Dan

[dan.banach]

Hi Matthew,

Were you able to get the helix that you were looking for?

-Dan

[MattPerez314]

So it can be done but it isn't ideal.... After playing with it you can draw a spline like your helix from the side and use it to split a sacrifical cylinder.  Then use the split line as your path to create your helical cut body..  I attached the file I used to play with it to see if it could be done.

https://a360.co/3KbXTnm

I don't know of any way it can be done with the Coil tool though.

[matthewph]

Hi Dan,

Sorry for my late response, I'm quite new to the whole Autodesk knowledge network, but thank you for your solution, I've tried a couple and this one, although not as ideal as a built in feature, seems to be working.

[matthewph]

Hi MattPerez314

Thanks for your idea, will give it a go.