can i twist a surface in place while extruding it?

asaf_chertkoff

sorry for the noob question, but i couldn't find the answer anywhere. 
i have a simple 2D pthikness"thikness"olygon, that i want it to extrude 5 cm, but also to twist it in place a whole turn.
tried to do it with helix but no luck.


any pointers? 
thanks.

NeilCooke

If you need more of a twist you may have to do it in sections. Here is one made a few months back: https://cad.onshape.com/documents/b12c2467c2176fcf852669e3/w/b69da02b940d7ccb572be036/e/bc72fffa6400cdb7eed49a07

RK

Helix needs a cylindrical or conical face.  You could create a surface and use that in your selection.  The helix can be created however, the geometry will have self intersection if the helix is not wide enough.  That could be another reason for the sweep along helix to fail.  It is like winding over a rod - a thread is easy, but to wind an n-sided object around needs sufficient pitch and diameter.

mahir

Take a look. You can use a sweep with a helix at one of the vertices acting as a guide curve.

https://cad.onshape.com/documents/57acdfaae4b005c413ed9b6f/w/3fd585a46d3af1b3ba413c53/e/f813cd6a214525be95f7ea75

NeilCooke

If you need more of a twist you may have to do it in sections. Here is one made a few months back: https://cad.onshape.com/documents/b12c2467c2176fcf852669e3/w/b69da02b940d7ccb572be036/e/bc72fffa6400cdb7eed49a07

mahir

@NeilCooke, the above method is surprisingly robust using a minimum of features. No intermediate profiles necessary.

NeilCooke

@mahir they must have fixed it then!