Hello,
I am trying to print this nut 3D. The thread is custom (5/16-14 LH, modified). Can anyone please help with the THREAD START and THREAD TERMINATION so it can be printed properly.
File is attached
Thanks for your help.
Hello,
I am trying to print this nut 3D. The thread is custom (5/16-14 LH, modified). Can anyone please help with the THREAD START and THREAD TERMINATION so it can be printed properly.
File is attached
Thanks for your help.
Thanks Henry, The link you added is for external thread. I had found none dealing with internal threads. IF you apply the tips for external thread on the internal one, it wont work.
I printed my model as is without any additional modification and it works. My mating male part is SS so after two or three engagement, the female part Nylon, adopt*s itslef. For two parts proto I was able to manage, as I am moving to produce hundreds. I am looking to enhance my geometry and remove this fitting step.
Regards
Adam
In the real world - the cutting tool starts motion outside of the part, therefore I would have modeled like the real world.
My Helix and Cutter Profile Sketch would start outside of the part (and in this case extend beyond the end of the cut).
(Just like the real world!)
Edit: Also, your cutter profile is not at the same location as the start of the Helix, I would consider this to be poor practice.
Thanks J. Mather, however this part will not be machined, it will be printed.
My Helix and Cutter Profile Sketch would start outside of the part=cutter profile is not at the same location as the start of the Helix.
two different ways to get the same result. I will not describe yours as a poor practice, I would describe it as a different method.
Thanks anyway.
Adam
Adam Folski wrote:
Thanks J. Mather, however this part will not be machined, it will be printed.
Doesn’t matter.
Adam Folski wrote:
Thanks J. Mather, however this part will not be machined, it will be printed.
The way you are modeling the thread in SolidWorks is a subtractive process - just like machining out on the shop floor, not a additive process like printing.
So it does make a difference at the modeling stage. (The logic can clearly be observed.)
How you are going to manufacture is then largely irrelevant (although I might add a bit more clearance given that printing isn't a particularly precise process - or you might chase the printed thread with a tap).
As JD told you.
Just "think" outside the part.
when I make internal threads, I typically sweep a protrusion rather than sweep a cut. my parts are almost always designed for injection molding so I find it easier this way. to terminate the end of the thread, I just sweep a feature that is the same profile as the thread but then dives into the part.
the attached file shows one end of the thread with this feature. since it's an end cap, the other end just extends into the part without a defined end but if the other end were open like you're part you'd just do a sweep similiar to what I did on my thread on both ends instead of just one.
you do need more clearance on your thread when 3d printing though as the process isn't nearly as precise as molding or machining.
see attached file for an example.
You have to add features to get the geometry you want for the start and termination. Here is an example of a part with modeled threads that is 3D printable. It has a couple of small revoled features for the start and stop.
https://www.3dcontentcentral.com/download-model.aspx?catalogid=171&id=943872
For your model you can start the helix outside the part and extend it beyond the part. Then you can clean up the small features created with some additional cuts.
There are several posts here about modeling threads with lots of detail.
modeling a thread and matching thread on the cap