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ptc-55026341-Visitor
1-Visitor
February 18, 2014
Question

Using projected and offset curves in swept blend

  • February 18, 2014
  • 2 replies
  • 2948 views

I am having trouble generating a swept blend through 3 sets of coordinates for a stator: hub, mid and tip. I have created a sketch for each set of coordinates and projected these onto the surface of the hub, radius 330 mm. I then offset the mid and tip sketches by the according lengths.

Creo will not let me generate a swept blend through these 3 profiles. I think the problem may lie with the fact they are curved but I am unsure as to why it will not generate. Any help would be greatly appreciated.

Thanks

Euan


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2 replies

N
neomechanikos1-Visitor
1-Visitor
February 18, 2014

I think you are correct. As far as I know, the sections need to be planar.

P
ptc-55026341-VisitorAuthor
1-Visitor
February 18, 2014

Thanks for your reply Eric.

Is there another way I can create this 3D model? I am really struggling to do so due to the complex geometry.

Cheers

Euan

N
neomechanikos1-Visitor
1-Visitor
February 18, 2014

Welcome to the forum, by the way. It's hard to tell what exactly you are doing without a picture or model. Can you upload your model (non-academic version)? Why can't you get away with planar surfaces with the swept blend?

If I understand it correctly (shot in the dark), the inner-most and outer-most surfaces will matter the most on the swept blend since it will have to match the hub and tip. If the hub and tip match a surface that is revolved about the stator, you can do an offset surface replace of the surface of each end of the blend.

Patriot_1776
Patriot_177622-Sapphire II
22-Sapphire II
February 18, 2014

Pick your trajectory curve, and unless otherwise specified, your section will remain normal to that curve. Now, add your additional trajectories one at a time, starting with the next most important, with dimensions to constrain the sketch. As you add trajectories, you will need to delete dimensions in the sketch. This will help you troubleshoot. Your additional trajectories should be as long as your origin trajectory curve, in a plane normal to the endpoint.

As noted, without a pic of what you're trying to do, it's almost impossible to help.

Best of luck.

P
ptc-55026341-VisitorAuthor
1-Visitor
February 20, 2014

Thanks for your reply Frank.

http://communities.ptc.com/thread/52936

My part model is uploaded in this thread. My profiles of the stator are not as sketches as I had to project them onto the curved surface in order to correctly model them. Then offset them and create one curve from the two offset sections through copy and paste.

Hopefully looking at my part model will help you understand. Thanks.

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