No idea how to crack this one... bending an extruded shape.

maciej_janowski

Hey,

I'm creating a model of a glasses frame, because my old one broke and I want to 3d print another one. All was well and good, but I have no idea how to give the lens holders a slight bend (that is present in original glasses and required for the lenses to fit).

https://cad.onshape.com/documents/a3f0189fd0590ed5b048b859/w/d6ab1656c8a5077ba51f786d/e/bc2ec22564ac7477e28a6d3eb

Here is the document I'm working on. Any ideas?

thomas_kozak

Your will want to use a sweep or a loft rather than an extrude.  For a shape that curves along more than one axis a loft between multiple profiles is probably best.

Edit: looking at the part, for those frames a better approach might be to create a curved surface (could be a large cylinder perpendicular to the frames) and split it with an extruded surface.  Then you can thicken the split face.

Here is a rough version of what I mean: https://cad.onshape.com/documents/56bd1beee4b0dc9b60c1ec11/w/7c01a20745ae9cdd06a4504b/e/00542765310bc15f83b3f8b3
Of course modeling the curve to match the lenses might be a bit trickier than a simple cylinder...

jakeramsley

Is the bend consistent in one plane?  If it is, I would use the replace face command.

1. Create a surface that represents the curve you are looking for.  I sketched a curve on the front plane and extruded it in both directions.




2. Start a replace face command

3. Select the face you want to bend for the face to replace.  Select the surface for the surface to replace with.

NeilCooke

Or you could try sketching the bent profile on a perpendicular (top) plane and using intersect option in the extrude command?

maciej_janowski

The replace method produced exactly what I was looking for, thank you!