topic Re: How do I set a variable twist in the Sweep tool? in Fusion Design, Validate & Document Forum

How do I set a variable twist in the Sweep tool?

Anonymous — Fri, 25 Dec 2020 20:56:01 GMT

Hello everybody!

I'm trying to sweep a circular profile over a straight path and create a cut using the Sweep tool. Crucially, I'd the sweep to have a variable twist. In other words, I'd like the first quarter of the twist to be a 800 degrees, and the rest of the twist to be 700 degrees.

I was able to get a constant twist:

But I'm not able to make the twist a variable one, increasing and/or decreasing along the sweep. I've attached my F3D file.

Note: I have tried to use the Equation Driven Curve add-in to create a curvy sweep path and use that instead of the twist feature in the Sweep tool, but I wasn't able to do it right to get a result similar to the pictures above but just with a variable twist.

Re: How do I set a variable twist in the Sweep tool?

jhackney1972 — Sat, 26 Dec 2020 00:16:20 GMT

Fusion 360 does not have variable pitch available in either the Sweep command or the Coil command so I think you are out of luck.

Re: How do I set a variable twist in the Sweep tool?

Anonymous — Sat, 26 Dec 2020 02:39:58 GMT

Thank you for the answer, @jhackney1972!

It's very unfortunate to hear this feature is not available. Are there any alternative methods I could use to achieve the desired result?

Re: How do I set a variable twist in the Sweep tool?

etfrench — Sat, 26 Dec 2020 05:35:05 GMT

Post #5 in this thread shows one method of creating a helix. There are better methods than this for plain helixes, but by rotating each layer by a different amount, you'll be able to create a variable pitch helix.

Experiment with different thickness layers as well.

This thread may also help.

Re: How do I set a variable twist in the Sweep tool?

Ajay_Kumar_Reddy — Sat, 26 Dec 2020 18:02:51 GMT

hey @Anonymous you can do that with multiple sweeps but I haven't got it continuously and also uniform twists.

watch the video to know in detail.

Re: How do I set a variable twist in the Sweep tool?

MichaelT_123 — Sat, 26 Dec 2020 21:25:35 GMT

Hi Mr Mark McBeth,

This is W.Shakespeare tragedy that such simple feature is not available for F360 mere mortal users :).

Consider to change its epilog by converting it to the soothing comedy.

https://forums.autodesk.com/t5/fusion-360-design-validate/variable-pitch-thread-helix/m-p/8494822

Regards & HNY

MichaelT

Re: How do I set a variable twist in the Sweep tool?

Anonymous — Sun, 27 Dec 2020 02:22:38 GMT

Thank you, everybody! I tried a bit more, and luckily I finally was able to do what I needed.

1. I used the Equatiojn Driven Curve add-in to create a variable pitch helix

2. I created the profile I needed to twist-sweep.

3. Finallly I used the Sweep tool, specifically the "Path + Guide Surface" type. The profile is the one mentioned above, the path is the variable pitch helix, and the cylinder surface as the guiding surface.

Now all I need is to understand those equation better to be able to create the exact twist angles I need. I attached the solution's F3D file.