Autodesk Inventor

[#1]

Hi,

I am working on Sweeping three helix profiles around a cylinder to create a screw thread.

When I sweep the profile, Inventor gives me the error messages:

"The attempted operation would create a self-intersecting surfaces. Try with different inputs".

or

"The attempted operation did not produce meaningful intersection edges from the face-face intersection. Try with different inputs".

However, this is exactly what I need to create the helix profile I require and eventually increase the size of the Extrusion Sweep profile to 80mm.

When I increase the sweep profile to 80mm I get the same error message about the self intersecting surfaces.

I am working with Autodesk Inventor Professional 2011, 64bit, 8gb RAM, Windows 7, Intel Core i7-2860QM.

Can someone please help me with this problem urgently??

[#2]

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hardguns wrote:

Can someone please help me with this problem urgently??

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The help will be faster if you attach an ipt rather than image files.

[#3]

Hi Thanks for your response,

I have tried to attach the file but cannot compress it down enough to add to the thread.

[#4]

Here is a single part file.

This is the middle Helix for my profile.

I cannot increase the diameter of the Sweep profile up to the required 83mm as the surfaces self intersect.

However I need these surfaces to intersect so that I can withdraw that profile from the centre cylinder.

Thanks for your help.

Tom

[#5]

Is this what your really want?

I would do the part completely different (no 3D sketches).

[#6]

Jeffrey, I think, a 3D spline is needed, because of the variable pitch of the helix. I didn't realize the distortions, because I regarded the 3D sketch as basic input. But after finishing my part, I added Extrusionsurface1 and 3D Sketch8. 3DSketch8 would give a better start.

But this part is a challenge, I spent some time with it. And I've asked myself for the reasion of the bad edge contour between the red and yellow face.

Now I hope to know: It's probably caused by the distortions of the basic 3D sketch.

Walter

[#7]

I didn't realize that it was a variable pitch on my quick inspection.

I would try some sort of wrap to cylinder to get the curve or the new Forumula driven curve generation in 2013.

[#8]

Hi Guys,

Thanks for your help, much appreciated.

JD, yes those parts you have circled in red are part of the helix profile i need to sweep.

How would you suggest I do it without 3d sketches?

I had imported my points in from an excel file using the 3d sketcher.

Is there a patch I can download to use the new formula generation in my 2011 version??

WH i cannot open your ipt file.

Thanks again..

[#9]

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hardguns wrote:

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JD, yes those parts you have circled in red are part of the helix profile i need to sweep.

The point is that is not a helical curve that I would expect.  I would expect it to be a circle in that view.

Is it correct or not?  Is that really really really what you want?

[#10]

Ive attached the excel file i have used to create the 3d sketch.

however when i add this into Inventor it gives me strange ends on the spline (that i had trimmed in the original ipt file). 

how could i constrain this to become more cylindrical without whose parts you had circled in your image?