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fphelps1-Visitor
1-Visitor
March 12, 2015
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Swept Blend with multiple trajectories?

  • March 12, 2015
  • 5 replies
  • 7424 views

Hi everyone, I wanted to know if it was possible to do a swept blend with multiple trajectory lines? I am trying to do a ergonomic grip enclosure handle that will house a PCB board and a motor. I am wanting one end of the handle to be a triangular spline will sweeping to a circle at the other end. The reason for the multiple trajectories is the profile line of the "ergo" part where the hand would grip. Any ideas to help would be greatly appreciated. Thanks in advance.


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Best answer by Patriot_1776

Short answer: Yes. I prefer VSS's (Variable Section Sweeps). I think you have more control, and smoother results, but each has it's place.

5 replies

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Patriot_177622-Sapphire IIAnswer
22-Sapphire II
March 12, 2015

Short answer: Yes. I prefer VSS's (Variable Section Sweeps). I think you have more control, and smoother results, but each has it's place.

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fphelps1-VisitorAuthor
1-Visitor
March 12, 2015

Thanks.

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fphelps1-VisitorAuthor
1-Visitor
March 16, 2015

Initially reading your response, I thought "Oh yeah I remember now" as it has been a few years since I used Creo. When I tried to perform this operation I didnt have too much luck. I'm wanting 4 profile trajectory / guide curves for my shapes to follow. 2 from the front view which would be the top and bottom splines. Also 2 from the top view which would be the side splines. When I try to do this I can only get 2 of the splines to select, and my shapes dont follow the splines like I thought they would. Is there any way you could provide a "quick and dirty" step by step. Thanks in advance for the help.

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fphelps1-VisitorAuthor
1-Visitor
March 16, 2015

I can sweep the spline across the 4 trajectory / guide curves no problem. Just FYI

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Patriot_177622-Sapphire II
22-Sapphire II
March 16, 2015

The first selection is your "spine" trajectory, the others you select using "ctrl-select" to get the others. Your sections have to reference the "reference points" of the section (use query-select). Depending on the trajectories, and the section geometry, some VSS's WILL fail because the geometry simply does not work. Without actually seeing it, it's hard to tell.

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fphelps1-VisitorAuthor
1-Visitor
March 16, 2015

Sorry about that I was using wrong terminology. This is what I was doing initially with no problem. The only thing I am wanting to do differently is have a circle on one end doing a VSS to a square on the other end, or any object going to a different object via VSS actually. Thanks again.

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fphelps1-VisitorAuthor
1-Visitor
March 16, 2015

Variable section sweep with multiple sketches?

 

I read your post in this thread at the 3/28 1:28PM time spot. This is it, and will be my work around until I hear you can do things differently. Thanks for the help.

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Patriot_177622-Sapphire II
22-Sapphire II
March 16, 2015

The limitation of the VSS is that you cannot have an arc segment turn into a line segment, or, worse, try and invert. When the radius goes to infinity, it divides by zero.... (a pun, meaning it fails).

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dschenken1-Visitor
1-Visitor
March 16, 2015

I'll wave the flag for the curvature-controlled element. There should be no problem because curvature only goes to infinity at a sharp corner, which is actually not realizable as even the sharpest corner is at least the size of an atom; not zero. Curvature can be a constant or varied along the element. The main constraint would be that the element be curvature continuous; no sudden changes/discontinuities in the curvature.

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