Why won't my sweep work on this conical face?

arran_sykes

My Document: https://cad.onshape.com/documents/2321cbcf0d44b31158ff04ce/w/f2825fa8c885e1939c852d71/e/ad9f99ec1f7e80c9886d86de?renderMode=0&uiState=6212cc1aa595140fd1d168d0 ( Be warned it takes a minute to try and generate a sweep)

I'm trying to construct a thread on a conical face using a helix and the sweep tool. I've been following the solution in the following discussion: https://forum.onshape.com/discussion/4905/trouble-sweeping-a-thread-profile-over-a-tapered-spiral-for-bspt-thread

It still doesn't want to generate and is giving me a boolean error.

My profile is smaller than the thread (0.025"). When I try to generate the sweep it takes a while and when it finally does I can see the whole path in red and it looks fine to me! That's what I want it to do but it won't!

Thanks in advance if anyone is able to help.

John_P_Desilets

@arran_sykes Is this part being 3D printed? If not, it is better to leave the thread model out to increase performance. Instead, note the thread size in a drawing.

Take a look at this approach. I used an offset surface to offset the solid part and extended the offset surface using the move boundary feature.

Next, I applied the helix to the surface not the solid part. This will allow the thread to cut completely through the part after the sweep. 


A few things to also consider, a standard thread is 60 degrees and the tool holder holding the cutting insert is perpendicular to the workpiece. (Image below) 









Hope this helps. let us know how you make out! 

https://cad.onshape.com/documents/5ae9656c2581d894e1fe3e6c/w/3c0b303fd85dc4551f55f5ca/e/bd9af78e3d4ea8f1dced9938

This technique is covered in the learning center for advanced part modeling. Check it out! 
Worm Gear Shaft

John_P_Desilets

@arran_sykes Can you please share your document as public? 

arran_sykes

Yes, sorry, I distinctly remember sharing it publicly but it wasn't when I just opened it... Maybe I didn't save it or something.. Either way that's it public now

glen_dewsbury

I suspect something with your sketch position but can't verify since shared with out copy/edit ability.
Here is a working sample that may help with method.
https://cad.onshape.com/documents/cb2bcd844a298bdf747100bc/w/98472c696ada5bf510cb4476/e/9bc8254b57bd50a9c814793e

glen_dewsbury

I repositioned the thread sketch at the beginning of the helix to simplify position on default plane.
Would suggest leaving helix pitch at 1 until all else is completed and verified then reset finer at the end to speed up over all process.
https://cad.onshape.com/documents/7f06ae181f7f81867527e1ba/w/d892968e97e227b11258b2dd/e/b64cff6e625782cfa140c39e

John_P_Desilets

@arran_sykes Is this part being 3D printed? If not, it is better to leave the thread model out to increase performance. Instead, note the thread size in a drawing.

Take a look at this approach. I used an offset surface to offset the solid part and extended the offset surface using the move boundary feature.

Next, I applied the helix to the surface not the solid part. This will allow the thread to cut completely through the part after the sweep. 


A few things to also consider, a standard thread is 60 degrees and the tool holder holding the cutting insert is perpendicular to the workpiece. (Image below) 









Hope this helps. let us know how you make out! 

https://cad.onshape.com/documents/5ae9656c2581d894e1fe3e6c/w/3c0b303fd85dc4551f55f5ca/e/bd9af78e3d4ea8f1dced9938

This technique is covered in the learning center for advanced part modeling. Check it out! 
Worm Gear Shaft

arran_sykes

Thank you both, I really appreciate both of your time! I'd spent a while trying to figure that out. Also, John your answer is far more detailed than I'd expected which is really great and helped a lot. I'll definitely checkout the tutorial, I'm a little overdue on my tutorials I done the more basic ones then jumped straight into the drawings.

The part is being 3D printed since I'm trying to make something that will screw into a circular thread so that when it's screwed in it will clamp down on to a ferrule to hold it in place. I'll hopefully be printing it tomorrow if not next week.

Also, sorry for the delay I've been working on other things the past few days