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How to modeling M8 thread
karsten_hjort_gregersen
Member Posts: 11 ✭
Hi
I am a beginner in the free onshape. I hope somebody can assist me to lean how to modelling threads e.g. M6 or 3/8" threads?
BR
Karsten
I am a beginner in the free onshape. I hope somebody can assist me to lean how to modelling threads e.g. M6 or 3/8" threads?
BR
Karsten
0
Comments
Usually we discourage making threads as they will noticeably decrease the performance of your part studio, and aren't really required for design. If you're trying to do this for 3d printing or something where the threads are actually required, you can try using this custom feature:
https://cad.onshape.com/documents/6b640a407d78066bd5e41c7a/w/4693805578a72f40ebfb4ea3/e/f8aea9e5c33e02eab0854a4f
If you've never used a custom feature before, check out these resources about how to add them to your toolbar and use them:
https://www.onshape.com/featurescript (Watch the video in the 'Start using custom features' section).
https://cad.onshape.com/help/Content/customfeature.htm
How does that custom feature actually create the threads??
The FS imports stuff from another document that is not public and gives no clue to how it makes the threads.
IR for AS/NZS 1100
This is not an internal Custom Feature.
@dave_cowden wrote it and may choose to answer if he wants.
Creating threads is not trivial, despite the apparent simplicity. As others have posted, actually modelling threads is typically only useful in special cases. One example is when making threads for 3d printing
The general process is:
Start with a cylinder
Make a helix
Make a sketch, which you use to cut the threads. For normal threads this is a triangle, but for other forms it is different.
Sweep the sketch along the helix to cut the threads
The complexities come in when you consider these things (in combination too)
Standard thread dimensions
Tolerancing. (Are you creating a nominal or realistic thread fit, and if so what thread fit)
Lead in and lead out
Multiple thread profiles
Multiple starts
Internal and external
Performance. There are a lot of tricks to get performance to be food. As an example, in my feature I actually don't do a cut sweep in one operation, I make the thread form then subtract it from the original instead.
Hope that helps!
@Jake_Rosenfeld
Thanks
IR for AS/NZS 1100