Flatten out in spring design

frank_ring

Hello,

I would like to design springs in onshape that flatten out at the end.
On the picture to see I achieve it only with an ugly kink.

Does anyone have a solution to this problem?

Thanks a lot!

matthew_stacy

@frank_ring, you might also try using a projected curve to transition from the helix to the flat coil. 

I created one sketch, comprised of a single circular arc, to straighten the helix.  Then I created a second sketch, again comprised on a single circular arc, but oriented perpendicular to the axis of the helix.  Projecting these two curves creates a nice transition from helical coils to the flat coil at the spring.

Then create a third sketch to complete the partial flat coil.

Does that work for your application?

matthew_stacy

@frank_ring, try it now.  You should be able to view and/or copy that document now.

glen_dewsbury

I played with an arc a small distance off the top of the coil and joined with a 3D fit spline. The result looks nicer. Don't know if it is accurate to your need.
https://cad.onshape.com/documents/12b0679a712bc6f544f72c07/w/67e973d9c8c7d9393a467fa0/e/ad111428e8f3c86c992bfae8

matthew_stacy

@frank_ring, you might also try using a projected curve to transition from the helix to the flat coil. 

I created one sketch, comprised of a single circular arc, to straighten the helix.  Then I created a second sketch, again comprised on a single circular arc, but oriented perpendicular to the axis of the helix.  Projecting these two curves creates a nice transition from helical coils to the flat coil at the spring.

Then create a third sketch to complete the partial flat coil.

Does that work for your application?

frank_ring

Thanks for the ideas. That's an interesting approach with the projected curve.
@matthew_stacy is there a way to view the document as a "free plan" user?

matthew_stacy

@frank_ring, try it now.  You should be able to view and/or copy that document now.

frank_ring

It worked - thanks a lot!