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ljapsey
Posts: 28
Registered: ‎08-15-2011
Message 1 of 14 (298 Views)
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Smooth Cam Surface

298 Views, 13 Replies
08-28-2013 07:15 AM

Is there a way to remove the 'parting' line  to create a smooth surface?

 

Thanks,

 

Larry

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Thanks,
Larry
Inventor 2015 - Update 2/Vault Professional 2015
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ljapsey wrote:

 

We have many Cams and they are created by hundreds of points and would be EXTREMELY time comsuming to redraw in Inventor, especially with no better end result or beneift.


Most likely approximations and not really correct anyhow.  Limited by the avialable technology of the time (AutoCAD).
You might look into the Inventor Cam Generator Design Accelerator.

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JDMather
Posts: 26,832
Registered: ‎04-20-2006
Message 2 of 14 (278 Views)

Re: Smooth Cam Surface

08-28-2013 07:52 AM in reply to: ljapsey

Where did this cam originate?

(the acceleration curve is interesting)

 

Why is the line a problem?

 

Did you use the Inventor Cam Generator to create the cam?

Accleration.PNG

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Active Contributor
ljapsey
Posts: 28
Registered: ‎08-15-2011
Message 3 of 14 (265 Views)

Re: Smooth Cam Surface

08-28-2013 07:58 AM in reply to: JDMather

JD,

 

This was just a mock up test part, not an actual cam.

The idea is still the same.  What we're trying to accomplish is importing the Acad 'spline' sketch into Inventor and extruding the cam surface.  I've tried polylines/open/closed/spline/loose points.  Nothing gives the desired result that I'm looking for.  The spline gives the best but  I'm always left with the begining/end point.  I've tried every option I can think of.  I've tried the 1st option you sent through, which accomplishes my intent almost, but does not follow the original shape.  It's buldged out slightly.

 

Any thoughts would be greatly appreciated.

Thanks,
Larry
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JDMather
Posts: 26,832
Registered: ‎04-20-2006
Message 4 of 14 (260 Views)

Re: Smooth Cam Surface

08-28-2013 08:03 AM in reply to: ljapsey

ljapsey wrote:

...  I'm always left with the begining/end point.  ....


 

I don't understand why this line is a problem?

 

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Active Contributor
ljapsey
Posts: 28
Registered: ‎08-15-2011
Message 5 of 14 (252 Views)

Re: Smooth Cam Surface

08-28-2013 08:14 AM in reply to: JDMather

JD,

 

Well, it's a faceted surface then and really doesn't need to be.

 

The machine shop has stated when using the geometry for cutting the cam that it leaves a bump.

 

If we use it for tangent contraints in the assembly, it will fail at the parting line.

 

More than anything, I'm just interally curious why it can't easily be removed be just a smooth/continuous surface.

 

Thanks for your input.

 

Larry

 

 

Thanks,
Larry
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JDMather
Posts: 26,832
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Message 6 of 14 (247 Views)

Re: Smooth Cam Surface

08-28-2013 08:17 AM in reply to: ljapsey

ljapsey wrote:

 

The machine shop has stated when using the geometry for cutting the cam that it leaves a bump.

 

If we use it for tangent contraints in the assembly, it will fail at the parting line. 


It is not faceted.  The machine shop should be able to remove the dwell in the G-code.

Tangent is not the correct assembly constraint to use - use Transistional.

I'll experiment a bit and see if there is a way of gettting the patch perpendicular to the planar faces, but I am not a big fan of using AutoCAD geometry in Inventor.

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JDMather
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Message 7 of 14 (237 Views)

Re: Smooth Cam Surface

08-28-2013 08:25 AM in reply to: JDMather

The problem is that the original curve was not tangent continuous (not that there is a line at that location).

 

I would need to see the original curve rather than the base solid to offer any other suggestions (other than use the Cam Generator within Inventor).

 

Original Geometry.png

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Active Contributor
ljapsey
Posts: 28
Registered: ‎08-15-2011
Message 8 of 14 (235 Views)

Re: Smooth Cam Surface

08-28-2013 08:26 AM in reply to: JDMather

JD,

 

I couldn't agree more, not a fan either.  This is about the only thing that we use the Acad geo for.

 

The majority of things is much easier to redraw.

 

We have many Cams and they are created by hundreds of points and would be EXTREMELY time comsuming to redraw in Inventor, especially with no better end result or beneift.

 

Thank You for your time!

 

On another note.  Did you happen to come across my other thread.  This is much more of an issue.

http://forums.autodesk.com/t5/Autodesk-Inventor/Shrinkwrap-Derive-Issue-with-Positional-Reps/td-p/43...

Thanks,
Larry
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JDMather
Posts: 26,832
Registered: ‎04-20-2006
Message 9 of 14 (231 Views)

Re: Smooth Cam Surface

08-28-2013 08:29 AM in reply to: ljapsey

ljapsey wrote:

 

We have many Cams and they are created by hundreds of points and would be EXTREMELY time comsuming to redraw in Inventor, especially with no better end result or beneift.


Most likely approximations and not really correct anyhow.  Limited by the avialable technology of the time (AutoCAD).
You might look into the Inventor Cam Generator Design Accelerator.

Please mark this response as "Accept as Solution" if it answers your question.
-----------------------------------------------------------------------------------------
Autodesk Inventor 2014 Certified Professional
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Certified SolidWorks Professional
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Active Contributor
ljapsey
Posts: 28
Registered: ‎08-15-2011
Message 10 of 14 (210 Views)

Re: Smooth Cam Surface

08-28-2013 11:58 AM in reply to: JDMather

JD,

 

Definately something to look at in the future.

 

Thanks,

 

Larry

Thanks,
Larry
Inventor 2015 - Update 2/Vault Professional 2015
Dell Precision M6600
Windows 7 Professional - 64Bit
32 GB Ram
Nvidia Quadro 3000M
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