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Smooth Cam Surface

13 REPLIES 13
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Message 1 of 14
mrdelicious2
1402 Views, 13 Replies

Smooth Cam Surface

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

 

Thanks,

 

Larry

Inventor 2013, SP2

Dell Precision M6600

Windows 7 Professional - 64Bit

32 GB Ram

Nvidia Quadro 3000M

Thanks,
Larry
Build 209, Inventor 2024.2/Vault 2024.2
Dell Precision 7760
Windows 10 Enterprise - 64Bit
128 GB Ram
Nvidia RITX A3000
13 REPLIES 13
Message 2 of 14
JDMather
in reply to: mrdelicious2

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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Message 3 of 14
mrdelicious2
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
Build 209, Inventor 2024.2/Vault 2024.2
Dell Precision 7760
Windows 10 Enterprise - 64Bit
128 GB Ram
Nvidia RITX A3000
Message 4 of 14
JDMather
in reply to: mrdelicious2


@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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Message 5 of 14
mrdelicious2
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
Build 209, Inventor 2024.2/Vault 2024.2
Dell Precision 7760
Windows 10 Enterprise - 64Bit
128 GB Ram
Nvidia RITX A3000
Message 6 of 14
JDMather
in reply to: mrdelicious2


@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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Message 7 of 14
JDMather
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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Message 8 of 14
mrdelicious2
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
Build 209, Inventor 2024.2/Vault 2024.2
Dell Precision 7760
Windows 10 Enterprise - 64Bit
128 GB Ram
Nvidia RITX A3000
Message 9 of 14
JDMather
in reply to: mrdelicious2


@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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Message 10 of 14
mrdelicious2
in reply to: JDMather

JD,

 

Definately something to look at in the future.

 

Thanks,

 

Larry

Thanks,
Larry
Build 209, Inventor 2024.2/Vault 2024.2
Dell Precision 7760
Windows 10 Enterprise - 64Bit
128 GB Ram
Nvidia RITX A3000
Message 11 of 14
JDMather
in reply to: mrdelicious2

How was the spline created in AutoCAD - was the C for close used or was the first point selected as the last point?


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Message 12 of 14
mrdelicious2
in reply to: JDMather

JD,

 

Generally.

 

It is a bunch of plotted points, turned into to a closed polyline (to make sure it's closed)

 

Pedit/Spline

 

I believe most of them were created before the spline command worked well in Acad.

 

Thanks,

 

Larry

 

Thanks,
Larry
Build 209, Inventor 2024.2/Vault 2024.2
Dell Precision 7760
Windows 10 Enterprise - 64Bit
128 GB Ram
Nvidia RITX A3000
Message 13 of 14
mrdelicious2
in reply to: mrdelicious2

JD,

 

Just trying out that DA Cam and that paring line exists.  The sketch from that comes in just like the one that I can make from the Spline/Acad sketch.

 

Learn something new everyday.

 

Thanks for all your help!

 

Larry

Thanks,
Larry
Build 209, Inventor 2024.2/Vault 2024.2
Dell Precision 7760
Windows 10 Enterprise - 64Bit
128 GB Ram
Nvidia RITX A3000
Message 14 of 14
JDMather
in reply to: mrdelicious2


@ljapsey wrote:

JD,

 

Just trying out that DA Cam and that paring line exists.  

Larry


The line is there, but if you go to the Inspect tab and do a Curvature Analysis you will see that there is no discontinuity across the line.  The curve is smooth tangent continuous across the line.


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