Question About Whether This Pipe Coupling Will Work

[varun.hariprasad]

I made a 3d printable pipe coupling to use with a pipe I currently have. Would this pipe fitting be compatible with the pipe? I am attaching a file of the pipe coupling and the pipe. 

[laughingcreek]

why attach the .stl?  multiple steps for us to see it.  exporting and attaching a .f3d file from fusion would be preferable.

[varun.hariprasad]

I don't think that file type is compatible with the forum. 

[laughingcreek]

that's the primary file type that is posted here. and the preferred one.

[varun.hariprasad]

Here is the f3d file. 

[HughesTooling]

One problem you've got is Fusion can not create a tapered modeled thread using the hole tool. You'll need to model a taper thread yourself. For 3d printing you might be able to use a combine cut then press pull the faces to get the fit you need. Not sure how strong it will be though, with the taper it'll generate quite a lot of force when you tighten it and might split.

Mark

[wmhazzard]

What you have will not print threads in the coupling, you need to cut the threads with the pipe. You can try printing this file as is and depending on if it is too tight or loose you can offset the thread faces. Also like what was said previously, the coupling will not be as strong as a PVC coupling. 

[varun.hariprasad]

I did as you recommended and actually cut out NPT threads using the pipe as a tool. Can you take a look at the new coupling? I'm now worried about whether the pipe is inserted in too much. 

Thank you very much!

[HughesTooling]

Really you're going to have to print it and see. What type of printer do you have, if it's a FDM printer it'll probably print under size and be tight so with the taper it'll not go as deep. 

Really a female thread should have extra clearance on the faces highlighted below. The outer one will press pull OK but the core diameter fails. You'll need to create a sketch and revolve cut the core bigger. Looks like you just created a cylinder at a random place so not simple to do now. I'd recreate the whole design using a sketch at the origin then place the imported pipe with a joint so it' parametric and easy to edit.

Mark

[varun.hariprasad]

I had one more question. Would I need to use a PVA support material if I print this pipe? 

[HughesTooling]

I've got away without support material but some will depend on the printer and material, even the slicer. My slicer will print slower if there are overhangs and also slow down if a layer doesn't get enough time to cool.

Mark

[varun.hariprasad]

The material I am planning to use is PETG. Would it cause any problems? 

[HughesTooling]

Don't know never used it. When I said material will make a difference it not just the type, even a different batch can melt at a slightly different temp. It's worth doing some test parts and see if you get stringing (too hot) or dragging filament (Too cold).

Mark

[varun.hariprasad]

How would you go about adding extra clearance to the faces you highlighted? I'm confused about how to go about doing the things you told me to do in the previous post? Could you maybe explain this more simply?

Thank You

Varun H.

Varun Hariprasad