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Creating Threads?

Newbie

Creating Threads?

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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15 REPLIES 15

Re: Creating Threads?

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.

Thread_section.PNG

Re: Creating Threads?

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

Goofy_Thread.PNG

Re: Creating Threads?

I will have to check this tomorrow, since I'm locked out of the computer that has the full Creo 2.0 until tomorrow when the computer owner can unlock it.

Re: Creating Threads?

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:

TRILOBE_SCREW-01.JPG

Re: Creating Threads?

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.

Re: Creating Threads?

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.

COOLING_MANIF-01.jpg

Re: Creating Threads?

In the helical sweep it shows you having 2 sketch es as part of the sweep. So far I can only get it to let me create1 sketch. How did you get the second sketch to work? 1 was the profile sketch (direction of travel?), and the other was the sweep sketch (groove).

Re: Creating Threads?

The sweep sketch is under references and it can be internal or external. Use the Edit button to create an internal sweep profile.

The sweep section is created under the 3rd button from the left (the little sketch pad with pencil). I think this can only be an internal sketch.

Re: Creating Threads?

When I click on Helical Sweep the 'References' tab is red. The only way I've been able to address that is to click on it and select 'Define'. When I do that it is no longer red, but at no point is it giving me access to the sketch command button just above the 'References' tab. Thoughts?

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