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How can I implement a gear into a center turn knob?!
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philip_thomas
Member, Moderator, Onshape Employees, Developers Posts: 1,381 
Answers
Too vague a question to know how to help.
https://cad.onshape.com/documents/5742c8cde4b06c68b362d748/v/16a222adf3cb9a3b33ed9536/e/c72760543a0d4412e72f6d38
https://cad.onshape.com/documents/579d9abf8945e8351d51cf07/w/29f4e929d7bf6459f346ab10/e/bf663825cd56696ad3ecb68f
The spur gear feature is great and I got that where it needs to be. There pictures in the part studio show what I'am trying to accomplish. Please direct me in how make these curvatures and dimples in the is Crank knob.
1) sketch the cap cross section and revolve
2) create a second part of one finger indentation (depends what shape it is - extrude & fillet or do a partial revolve & fillet)
3) use shell to make wall thickness
4) use boolean to add the finger indents
Help and Learning Center for details. Let us know if you run into snag on specific things.
I need this hollowed out and the gear left alone if anyone can help with that much appreciated as I can seem to get it to hollow out! and the gear spur diameter I originally set to circle diameter of 16.8 and the print comes out 19.21mm.
First thing for starters, if you would like to get the shell hollowed out like in your picture, you should untick the 'Hollow' option in your Shell feature. This will make it an open shell like the one in your picture, and not an enclosed hollow object.
Next, the reason why your Shell feature has an error is because of the thickness of the gear portion protruding out of the object, which is 1.7mm
In the Shell feature option, you've set Shell thickness to 2.5 mm but there's only 1.7 mm of thickness available there, so the system can't resolve it. If you set the Shell thickness to 1.7 mm, the Shell feature should resolve successfully.
This would give an object that looks like this:
However, if you prefer to keep the thickness to 2.5mm, and also let the spur gear extend all the way to the top, you could extrude a 'New' part in your Extrude 4 step, instead of 'Add' to Part 1.
There's some cleaning up to do, as there will be overlapping geometry, which I think could be optimized at the steps earlier up the Feature tree, but I'm a bit lazy so I just rolled with what's on that Extrude 4 step
You could then just Shell Part 1, and then merge Part 1 and Part 2 together, giving an object that looks like this:
Here's the document of the above object:
https://cad.onshape.com/documents/2d4ad7515ef0c117b2245f4b/w/7360f2cd805fa5e377555076/e/38576bb6d20490892ebabec0
Hope this helps and that it is what you're looking for!