How to draw/sweep on a concave surface?

cabel_mcelderry

Hi could someone possibly help or direct me where I might find how to model the attached? Specifically the ribs on the concave surface of the body. I reviewed the article on creating a knurl using helix and sweep but can’t get that to work on the concave surface. Thank you.

MichaelPascoe

Go to the example model with this link Onshape Document, you can double click any of my features to see how they were set up. I have set it to public.

MichaelPascoe

My approach would look like this:

Example Document

1. Sketch the main profile.
2. Revolve the main profile.
3. Create a plane at the angle that you want your groove. some of those parts have angled grooves.
4. Create a sketch on that plane for the groove sweep to follow.
5. Create another plane on the end of the groove path with your groove profile.
6. Sweep Remove the groove.
7. Circular Pattern the sweep feature around your part.

cabel_mcelderry

Thank you!

konstantin_shiriazdanov

The parts on your picture look like they are worm wheels, if it so then simply sweep or revolute some cross section won't give you accurate shape of worm wheel tooth

cabel_mcelderry

Ok I’m still not understanding something. I created the body with a revolve. I added a plane offset 0 to bottom of body, sketched the groove (just used a 2mm circle centre coincident to edge of profile) created another plane offset 0 on top of body, drew same circle. Selected first circle with sweep,  

MichaelPascoe

Go to the example model with this link Onshape Document, you can double click any of my features to see how they were set up. I have set it to public.

cabel_mcelderry

Ok I’m still not understanding something. I created the body with a revolve. I added a plane offset 0 to bottom of body, sketched the groove (just used a 2mm circle centre coincident to edge of profile) created another plane offset 0 on top of body, drew same circle. Selected first circle with sweep,  Then tried to select the sweep path, tried other circle, plane at end of path, face of body, nothing worked, what am i not understanding?

cabel_mcelderry

Got it now I understand! Thank you!