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Making line configurations closed shapes for extrusion?

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03-07-2011 03:33 PM

I just completed a sketch for a simple part I'm working on. It contains some arcs, lines, and rectangles that I've drawn. When I went to extrude them to make the sketch 3D, not all of the shapes I created could be extruded, presumably because in my sketch the lines/arcs did not come together properly to create a closed shape.

 

How do I fix this?

Well, it wasn't missing coincident constraints - it was mainly geometry that was not sketched well. By that I mean:

 

-The long arcs on both sides extend past where they should intersect the line and needed to be triimmed back the intersection with the straight line.

 

-One of the long arcs had a duplicate sketched on top which needed to be deleted.

 

-Some of the geometry didn't actually extend far enough and had a gap etc.

 

Also, with the symmetry of this sketch, I would create one half and then mirror the duplicated portions. That keeps things that could go wrong to a minimum.

 

I've attached the cleaned up geometry that will extrude (R2011), but the best advice to keep this from happening again is to make sure you have a clean, well modeled sketch. The green dot when you are sketching is your best friend. It means you have a clean termination and coincident constraint.

 

 

 

Best regards,

 

Paul

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Post 2 of 17

Re: Making line configurations closed shapes for extrusion?

03-07-2011 04:29 PM in reply to: sciguy77

Hi,

 

Inventor determines closed shapes by finding all the coincident loops. I would need your actual geometry to troubleshoot. However, if you turn on the constraint display, you can see if you are missing coincident constraints at intersections that should form a closed loop and add them manually.

 

Best regards,

 

Paul



Paul Normand
Principal Content Developer/SME
Design Lifecycle and Simulation (DLS)
Autodesk, Inc.

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Re: Making line configurations closed shapes for extrusion?

03-07-2011 05:24 PM in reply to: Paul.Normand

I've attached the .ipt, as you can see its very simple sketch, but hey, we've all got to start somewhere, right?

 

I tried manually adding a closed loop, but got a "too many constraints" error. How can I fix this?

 

 

Thanks!

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Post 4 of 17

Re: Making line configurations closed shapes for extrusion?

03-07-2011 05:53 PM in reply to: sciguy77

This is not a simple sketch. Time to lose the AutoCAD habits and create multiple features from this geiometry.

 

 


sciguy77 wrote:

I've attached the .ipt, as you can see its very simple sketch, but hey, we've all got to start somewhere, right?


 

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Post 5 of 17

Re: Making line configurations closed shapes for extrusion?

03-07-2011 05:54 PM in reply to: sciguy77

Well, it wasn't missing coincident constraints - it was mainly geometry that was not sketched well. By that I mean:

 

-The long arcs on both sides extend past where they should intersect the line and needed to be triimmed back the intersection with the straight line.

 

-One of the long arcs had a duplicate sketched on top which needed to be deleted.

 

-Some of the geometry didn't actually extend far enough and had a gap etc.

 

Also, with the symmetry of this sketch, I would create one half and then mirror the duplicated portions. That keeps things that could go wrong to a minimum.

 

I've attached the cleaned up geometry that will extrude (R2011), but the best advice to keep this from happening again is to make sure you have a clean, well modeled sketch. The green dot when you are sketching is your best friend. It means you have a clean termination and coincident constraint.

 

 

 

Best regards,

 

Paul



Paul Normand
Principal Content Developer/SME
Design Lifecycle and Simulation (DLS)
Autodesk, Inc.

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Registered: ‎03-05-2011
Post 6 of 17

Re: Making line configurations closed shapes for extrusion?

03-07-2011 06:46 PM in reply to: Paul.Normand

Thanks a million Paul, that was really helpful.

 

Yes, it was sketched poorly, that was my 1st sketch ever (never even used AutoCAD). Thanks for understanding and helping me out. :smileyhappy:

*Expert Elite*
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Post 7 of 17

Re: Making line configurations closed shapes for extrusion?

03-07-2011 09:10 PM in reply to: sciguy77

 

Hi sciguy77,
I addressed the issue of simple sketches in a recent blog entry. Have a look, and give the suggested method some study, and then I'm certain you'll find sketching in Inventor to be more friendly going forward.
http://inventortrenches.blogspot.com/2011/03/inventor-101-simple-fully-constrained.html
Best of luck to you in all of your Inventor pursuits,
Curtis

 



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Post 8 of 17

Re: Making line configurations closed shapes for extrusion?

03-08-2011 03:12 AM in reply to: sciguy77

sciguy77 wrote:

.... that was my 1st sketch ever....


You might also read this document.    http://home.pct.edu/~jmather/skillsusa%20university.pdf

 

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Post 9 of 17

Extrude a projected 3D curve

02-10-2012 03:24 AM in reply to: sciguy77

Dear everyone,

 

How can I extrude a line which is a 3D sketch that I used the command "project to surface"?  Can Inventor do this?

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Post 10 of 17

Re: Extrude a projected 3D curve

02-10-2012 04:58 AM in reply to: teresa

Instead of projectomg to that surface - why didn't you simply extrude to that surface.

That is exactly what you are requesting, but done in the logical order and fewer steps.
Attach your file here.

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