Backside NPT Thread MIll

[lmiller]

Hi,

I am making a 1/2" npt thread on a vertical mill with a single form tool. The catch is I want to do it without flipping the part over so that means that the taper will be reversed. I have modeled the hole with the taper but the tool path keeps generating the taper the wrong way. hope this makes sense. Any help would be appreciated

[seth.madore]

I don't think what you're wanting to do is possible

[lmiller]

Hi Seth,

Is it not possible in Fusion or is it not physically possible?

[seth.madore]

Not possible in Fusion with the Thread toolpath. It's a bit hacky, but if you were hellbent on doing it in reverse, you might be able to get a Ramp toolpath to work would need to use a 3D toolpath that supports undercuts AND a ramp move 🤔

[leo.castellon]

How would you inspect the thread when machining it from that direction? 

LeoC

[lmiller]

Hi Seth,

If I were making thousands of these then I'd make an attempt. This project is for a small run so I'll fixture it up and flip the part. Thank you!

[lmiller]

Hi Leo,

These threads are on the underside of a 22" x 22" PVC plate. I would probably first trial run the thread on small pieces of PVC. Once the program was dialed in, I would run the 22" plate. Since the material is PVC it does not wear on the tools so I would get repeatable results.