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Rectangular helical sweep feature

Re: Rectangular helical sweep feature

Oh, if only it were possible. I needed something exactly like this to build a the inlet spiral of a cyclone. It would have been nice to have a flat pattern of that, especially when I was building an PVC hot-formed prototype.

Re: Rectangular helical sweep feature

I am getting obsessed  to this a little . I found a way to allow me to sweep along a closed contour in Creo and this allows me to create the helical spring with constant gradient. Just want to share it and please ignore if you are already aware of this trick:

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Re: Rectangular helical sweep feature

You might have just hit the nail on the head, BH.

Are you using trajpar in a sweep?

Re: Rectangular helical sweep feature

yes, there is a relation in its sketched section. For some reasons, Creo does not allow trajpar to work on closed contour. You may educate me more on this. Thanks.

Re: Rectangular helical sweep feature

Nope, you are correct that closed loops do not work.

Re: Rectangular helical sweep feature

I extended one end of the trajectory curve to avoid both ends meet at the same point (closed loop). With this way, I can sort of "cheat" the creo and it allows me to complete the sweep feature. The excess can then be trimmed off.

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Re: Rectangular helical sweep feature

My only consideration with the tail is the additional work required to manage pitch accurately.

Two half sections will take care of that.

Also looking at the conical/tapered versions.

More and more are sheetmetal rules required to know where to place the origin curve.

K and Y factors should be considered for profile sections not round.

Re: Rectangular helical sweep feature

true, the pitch is hard to control in this approach. I try to address this issue by having a continuous sweep trajectory, and this is done by repeating the path section and select them sequentially during sweep. What do you think?

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Re: Rectangular helical sweep feature

Try this. This is the most simplest of all. just 5 features.

You can control pitch, section, radius.....

Re: Rectangular helical sweep feature

I think this is where we started.

The problem with this technique is that the pitch is not constant at the intersection.

You will see a "wave" in the long section.

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