How to design an external & internal thread (simplified) and then draw it as shown in the picture?

Tamer_Mrie

sebastian_glanzner

@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

sebastian_glanzner

@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

john_corelli

@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?

Ste_Wilson

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.