Creating Parts that Screw Together

jack_heslin

Hello Everyone,

Although I've had a free Onshape account for years I've just now started going through the tutorials. I will keep progressing with them but there is something I'm trying to make now. I have a 3D Printer in my home and I want to make a cylinder (hollow) with a screw on top. So the outside of one end of the cylinder needs to be threaded and the inside of the lid needs to be threaded. I've looked for tutorials on this and haven't found anything yet. 

Can someone provide some direction?

Thanks,

Jack

john_mcclary

here is a quick video on creating a thread
https://youtu.be/IcRPb1sWwlA?t=114

Also here is a featurescript that will do it for you:
https://cad.onshape.com/documents/6b640a407d78066bd5e41c7a/v/845d049782179b9faee8b6e6/e/c953720c264ce001f1a82dc1?jumpToIndex=1368&showReturnToWorkspaceLink=true

jack_heslin

Hi John,

Thank you very much for the video. I've been practicing and I think I'm starting to get it. But one more question if you don't mind. Once the threads are made at the ends of the U bolt, what's the quickest way to make the opposite threads in a part to screw in there? Is there someone kind of opposite mirror command that would put that thread on the inside of a nut to screw on there? What's the quickest way to do that? 

Thanks very much,

Jack

john_mcclary

I would attach the two parts and boolean subtract the threaded part from the non threaded part. 

owen_sparks

Just a word of warning for 3D printing you'll probably want to allow some tolerance and also round off the peaks of the threads.

Owen S.

john_mcclary

@owen_sparks correct.

@jack_heslin
The option for adding clearance can be done within the boolean-subtract dialogue also: