Filleting threads

vivek_gupta545

Hello, 

I made threads on a cylindrical surface by doing a sweep across a helical curve (photo attached). I'm trying to fillet the inner edge of the thread (highlighted) but it doesn't seem to work out. I've tried reducing the radius of the fillet to a very small amount as well. Does anyone have any ideas? Is there a OnShape equivalent of a face fillet that's found in SolidWorks? 

Thanks!

JDesilets

Have you tried using the custom feature for creating threads? 

https://cad.onshape.com/documents/6b640a407d78066bd5e41c7a/w/4693805578a72f40ebfb4ea3/e/f8aea9e5c33e02eab0854a4f

This tool might be easier for you to build a thread.  

mahir

I would use the FS if possible, but another option is to just build the fillet into the thread profile.

philip_thomas

COUNTERPOINT - PLEASE DON'T MODEL THREADS!!!!!
I spend several hours a week defeaturing customer documents that contain hundreds of fasteners with threads, fillets, text and knurls.
If you download a fastener (eg from McMasterCarr) - step 1 is to delete the threads (and put it in it's OWN standard parts doc).

A SHCS should be two cylinders - that's it!
If you beg me, i will let you put the socket on the head (no fillets!)

If the thread is functional and you need to 3D print it - thats fine, but once you have exported the STL file, suppress the threads.

mahir

Why don't you tell us how your really feel, @philip_thomas