Spiral Sweep

joe_gehrer

I am trying to make a tutorial vidoe for my students to make their own spiral fidget cones(seen here) but I can not figure out how to make the sweep twist as it does in this Fusion360 video. Any ideas for how I caould recreate this feature in OnShape?

Thanks!

rafael_telgmann

there ist no link in your post.

_anton

One of these, I assume? https://www.thingiverse.com/thing:6613158

joe_gehrer

Apologies, not sure why the link didn't attach to the origional post, thank you _anton that is similar to what I was thinking. Any ideas how to do a sweep twist in OnShape

_anton

Noodled on the design a bit, came up with this:

https://cad.onshape.com/documents/631e99f6640ba9bc74ec80f1/w/c58d3266db16c4ec0385cc5c/e/44a17cf49805a6768f325fe1

It's not terribly parametric but works as a proof of concept. Maybe I'll try to print it later today…

joe_gehrer

_anton, thank you. Any chance you could do a quick screen recording on how you did that? I am very new to onShape and trying to keep 1 or 2 steps ahead of my student!

Thanks so much!

_anton

Honestly, the approach I took is a bit involved for a student. This design took some trickery.

You'd learn best, I think, if you copy the document and go through the features. Feature by feature:

1. Sketch 1: basic profile to revolve.
2. Revolve 1: create the revolved body.
3. Transform 1: copy the cone; one inner and one outer.
4. Helix 1: create a helical sweep path I'll use to make the ridges (if you hide the two parts, you'll note that the helix is very steep - it makes just 1/3 of a rotation).
5. Sketch 2: create two profiles to sweep along the helix; one vaguely wedge-shaped to create the main cutouts and a smaller one to make that round effect on the fins.
6. Sweep 1: sweep the wedge thingy and create a new body we'll remove later.
7. Sweep 2: sweep the other profile and also create a new body.
8. Circular pattern 1: pattern the two swept bodies, with the Remove option on. This will pattern both and subtract them from the inner part.
9. Boolean 1: now that the inner part's cutouts are all done, subtract it from the outer part (with an offset so that we have a bit of clearance).

_anton

Maybe it would be easier to design a regular fidget spinner or something like this screw thingy? https://cad.onshape.com/documents/1b4bcdcb1a5d67425fead370/w/d3a79293e608305d2cd0c866/e/b2081402443934b74a27933b