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How to design an external & internal thread (simplified) and then draw it as shown in the picture?
Tamer_Mrie
Member Posts: 2 EDU
1
Best Answer
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sebastian_glanzner
Member, Developers Posts: 488 PRO
@Tamer_Mrie
Onshape doesn't support external threads. And the internal threads can't be dimensioned correctly.
But there are different ways how to do it.
A: You can "cut" the simplified lines into the part. But you have to be careful to not cut the part in multiple pieces.
B: You can also use the featurescripts I wrote:
Internal threads:
https://cad.onshape.com/documents/41326316775b71b4c76d71c2/w/bdab4a37f9f548848e230c4d/e/113d4ba1dc7ffa295c02a7d3
External threads:
https://cad.onshape.com/documents/190ed381cc4d7d3644e4459b/w/69776a82bab11838fe161502/e/d9fb3f464191d0390b8ff49f
I made an example document for you with both methods:
https://cad.onshape.com/documents/dccca648e2e31d7de54d477d/w/4da8f0b275abe2bb47f2edd2/e/b4c09982496d4194cc439659
2
Answers
Onshape doesn't support external threads. And the internal threads can't be dimensioned correctly.
But there are different ways how to do it.
A: You can "cut" the simplified lines into the part. But you have to be careful to not cut the part in multiple pieces.
B: You can also use the featurescripts I wrote:
Internal threads:
https://cad.onshape.com/documents/41326316775b71b4c76d71c2/w/bdab4a37f9f548848e230c4d/e/113d4ba1dc7ffa295c02a7d3
External threads:
https://cad.onshape.com/documents/190ed381cc4d7d3644e4459b/w/69776a82bab11838fe161502/e/d9fb3f464191d0390b8ff49f
I made an example document for you with both methods:
https://cad.onshape.com/documents/dccca648e2e31d7de54d477d/w/4da8f0b275abe2bb47f2edd2/e/b4c09982496d4194cc439659
@sebastian_glanzner
I've been able to add the script to my project, but it's not clear on how to use it. Applying the external thread on a cylinder appears to draw the helix pattern on it, but do I still need to draw the thread cross section and sweep it to make the actual thread?
Are you modeling for traditional manufacture or 3D print?
If traditional manufacture (e.g. chopping up a bit of steel bar) and you just need info for a drawing then you don't need this feature script now.
In the five years since this thread was active this is now a standard part of onshape. You can do internal threads with the hole tool and external threads with the external thread button. Onshape will put a cosmetic thread on the 3D views and show the tramlines/ broken circles to represent threads on drawings.
These are not actual threads. Just a representation to save on the resources needed to render threads.
If you're after threads for 3D printing there are other feature scripts (plastic threads, I think, or thread creator, I'm not in a position to hunt them out at the moment) which will do that for you.