Creating Threads?

Forum|Forum|12 years ago
June 26, 2013
3 replies
10203 views

I've been trying to create threads, but I can't seem to get it to work correctly. I tried doing so as a helix and then creating a sketch within that, but I still couldn't get it to help.

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General

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TomD.inPDX

17-Peridot

Yes, physical threads are usually helical cuts. And yes, they often fail for the silliest reasons.

Are you using the full Creo 2 version? I've attached a cap screw file if you can use it.

1_thread-prt-2.zip

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TomD.inPDX

17-Peridot

I'm glad I looked at that command again... the Helical sweep. It has some really powerful features:

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ptc-5122510

Author

1-Visitor

What feature or option did you pick to get the threads to taper as they do in the picture above?

Patriot_1776

22-Sapphire II

I've found using a surface to cut threads (solidify) works well, because you can control the lead-out near the head easily, and it generally won't fail like a regular solid cut will. Yes, it's another feature, but I think it's more robust.

For fun, I did a Tri-Lobe thread years back:

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TomD.inPDX

17-Peridot

True... the helical sweep is much like the VSS (optional) with an added variable "pitch" option and with the limit that it is rotational about the axis.

Patriot_1776

22-Sapphire II

Now that I remember, I had a pretty tricky challenge at work once, where a CNC lathe was used to cut grooves in a large cylindrical stainless piece. I was unable to use the helical sweep command because the lead-in and lead-out of the grooves cut by the rotating head (this very large lathe had both stationary (point) tools and a rotating head (think miling machine) was far too abrupt. I had to go from full depth of "threads" (1/2-circle groove via ball-end mill) to zero depth of thread in less than 10deg of rotation about the cylinder, while still keeping the pitch/lead constant.