Inventor General Discussion

Inventor General Discussion

Reply
Active Member
hardguns
Posts: 6
Registered: ‎10-08-2012
Message 1 of 12 (1,118 Views)

Self Intersecting Surfaces Helix Profile Sweep

1118 Views, 11 Replies
10-08-2012 04:12 PM

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??

*Expert Elite*
JDMather
Posts: 28,228
Registered: ‎04-20-2006
Message 2 of 12 (1,104 Views)

Re: Self Intersecting Surfaces Helix Profile Sweep

10-08-2012 07:51 PM in reply to: hardguns

hardguns wrote:

 

 

Can someone please help me with this problem urgently??


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

Please mark this response as "Accept as Solution" if it answers your question.
-----------------------------------------------------------------------------------------
Autodesk Inventor 2015 Certified Professional
Autodesk AutoCAD 2013 Certified Professional
Certified SolidWorks Professional
Inventor Professional 2015-SP1 64-bit
http://www.autodesk.com/edcommunity
http://home.pct.edu/~jmather/content/DSG322/inventor_surface_tutorials.htm
Active Member
hardguns
Posts: 6
Registered: ‎10-08-2012
Message 3 of 12 (1,101 Views)

Re: Self Intersecting Surfaces Helix Profile Sweep

10-08-2012 07:53 PM in reply to: hardguns

Hi Thanks for your response,

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

 

Active Member
hardguns
Posts: 6
Registered: ‎10-08-2012
Message 4 of 12 (1,092 Views)

Re: Self Intersecting Surfaces Helix Profile Sweep

10-08-2012 10:27 PM in reply to: hardguns

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

*Expert Elite*
JDMather
Posts: 28,228
Registered: ‎04-20-2006
Message 5 of 12 (1,048 Views)

Re: Self Intersecting Surfaces Helix Profile Sweep

10-09-2012 04:32 AM in reply to: hardguns

Is this what your really want?

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

Helix.PNG

Please mark this response as "Accept as Solution" if it answers your question.
-----------------------------------------------------------------------------------------
Autodesk Inventor 2015 Certified Professional
Autodesk AutoCAD 2013 Certified Professional
Certified SolidWorks Professional
Inventor Professional 2015-SP1 64-bit
http://www.autodesk.com/edcommunity
http://home.pct.edu/~jmather/content/DSG322/inventor_surface_tutorials.htm
Distinguished Mentor
Distinguished Mentor
wh
Posts: 591
Registered: ‎12-27-2003
Message 6 of 12 (1,013 Views)

Betreff: Self Intersecting Surfaces Helix Profile Sweep

10-09-2012 07:07 AM in reply to: hardguns

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.

 

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

 

Walter

 

 

*Expert Elite*
JDMather
Posts: 28,228
Registered: ‎04-20-2006
Message 7 of 12 (997 Views)

Betreff: Self Intersecting Surfaces Helix Profile Sweep

10-09-2012 09:07 AM in reply to: wh

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.

Please mark this response as "Accept as Solution" if it answers your question.
-----------------------------------------------------------------------------------------
Autodesk Inventor 2015 Certified Professional
Autodesk AutoCAD 2013 Certified Professional
Certified SolidWorks Professional
Inventor Professional 2015-SP1 64-bit
http://www.autodesk.com/edcommunity
http://home.pct.edu/~jmather/content/DSG322/inventor_surface_tutorials.htm
Active Member
hardguns
Posts: 6
Registered: ‎10-08-2012
Message 8 of 12 (974 Views)

Betreff: Self Intersecting Surfaces Helix Profile Sweep

10-09-2012 02:10 PM in reply to: JDMather

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..

*Expert Elite*
JDMather
Posts: 28,228
Registered: ‎04-20-2006
Message 9 of 12 (972 Views)

Betreff: Self Intersecting Surfaces Helix Profile Sweep

10-09-2012 02:14 PM in reply to: hardguns

hardguns wrote:

.

 

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?

Please mark this response as "Accept as Solution" if it answers your question.
-----------------------------------------------------------------------------------------
Autodesk Inventor 2015 Certified Professional
Autodesk AutoCAD 2013 Certified Professional
Certified SolidWorks Professional
Inventor Professional 2015-SP1 64-bit
http://www.autodesk.com/edcommunity
http://home.pct.edu/~jmather/content/DSG322/inventor_surface_tutorials.htm
Active Member
hardguns
Posts: 6
Registered: ‎10-08-2012
Message 10 of 12 (962 Views)

Betreff: Self Intersecting Surfaces Helix Profile Sweep

10-09-2012 02:26 PM in reply to: JDMather

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?

Post to the Community

Have questions about Autodesk products? Ask the community.

New Post
Announcements
Do you have 60 seconds to spare? The Autodesk Community Team is revamping our site ranking system and we want your feedback! Please click here to launch the 5 question survey. As always your input is greatly appreciated.