how to model that in onshape ?

serge

Hello,

I couldn't find out how to build this in onshape. 
Note : the draft won't work because the side of each tooth is parallel.

Thank you

Serge

_Ðave_

I believe that the rotate option in the move face command will work for this as in the following link.

https://cad.onshape.com/documents/98054ea36e1e4306858ea861/w/57381245ac76445886693133/e/4bc44f9ce3214404ad335d0d

andrew_troup

Another (rather straightforward) way would be to sketch the profile equivalent to a section at the midplane, the use "Sweep" as a workaround for "Extrude at angle" in one direction from the midplane, then mirror the result about the midplane

michał_1

Hi, maybe I don't get something but geometry from first post you should get easili with draft:

_Ðave_

I believe that the rotate option in the move face command will work for this as in the following link.

https://cad.onshape.com/documents/98054ea36e1e4306858ea861/w/57381245ac76445886693133/e/4bc44f9ce3214404ad335d0d

serge

thank you very much DaVicki  It does the trick indeed ( I will have to make 4 rotate face) .

andrew_troup

Another (rather straightforward) way would be to sketch the profile equivalent to a section at the midplane, the use "Sweep" as a workaround for "Extrude at angle" in one direction from the midplane, then mirror the result about the midplane

serge

ha yes ! i'm impressed thank you . I'm still a little new to onshape and can't find good strategies with some models. Even we did the all smartrapcore here ( I'm smartfriendz guy ) , there is still a lot to learn with this wonderful tool. 
Thanks

andrew_troup

Actually, something we both missed - DaVicki's excellent suggestion works just fine with "Draft" (which the OP had considered and rejected) instead of "Move (Rotate) Face"
https://cad.onshape.com/documents/a83345d4bdc74ca993f680d5/w/2caf6afc558b4a4385ee338e/e/bc1ad38b07514f12acbb989d

I also took the further liberty of extracting the Midplane profile from the solid shape resulting from his (modified) method, and derived those sketches into a second Part Studio to demonstrate my alternative "Extrude at Angle" method, and found it was not quite as simple in practice as in theory : I had to add a "Cut-Extrude" to trim the end.

Thanks, both of you, for the intriguing puzzle.

michał_1

Hi, maybe I don't get something but geometry from first post you should get easili with draft:

andrew_troup

On Edit:

 I didn't look carefully enough at the OP's geometry but focussed on @DaVicki 's model - as michał_1 points out, there appears to be a draft angle on all four faces for the OP, although possibly steeper on leading vs trailing faces (but not a problem - just needs two draft features if so)

serge

ha yes Andrew ! Now i feel like an idiot ... simply draft  you didn't miss anything. 
thank you so much