How to build a Helical Circular sweep? 1

[skr3178]

I am trying to create a part which looks like in the image.

My sweep function fails when I try to match the dimensions from image.

Any suggestions would be highly appreciated.

Thanks

 

[TheTick]

Equation-driven curve is perfect for this.

 

[skr3178]

Thanks for your advice.
I have found help on single helix in parametric form.
Any ideas on how to make it for a double helix?Link
Thanks and sincerely

 

[skr3178]

I got something to work, but only one catch. The ends don't match up!

 

[TheTick]

The epicycles are additive. (What the heck does that mean?)

The base equation is a circle, with a helical epicycle added to it. You have a big spiral and a small spiral. You can have either cycle added singly to the circle. You can also simply add the two cycles to the circle. You can do this for any number of cycles.

 

[skr3178]

Yes, that is double layer helix.
I don't have the parametric form for it though. I will do some more search on it

 

[TheTick]

This may work better in a cylindrical or spherical reference frame.