Problem with 2D contour cutting, inconsistent behaviour at beginning vs end

[c60nils]

I'm having an issue with 2d contour cutting. 

I'm selecting an open contour around an object. 

It respects the one end of the line but not the other, resulting in a path that cuts into the object.

The only way I could get around the issue is to set tangential fragment to -(tool radius)

Seems like a bug to me, but thought I'd ask here first.

Nils

[Anonymous]

Actually it's not inconsistant, the tangent meets the corner in both ends.

What happens if you enable Stock contours? I did some testing on a similar piece and got some really weird results...

David

[c60nils]

I see what you're saying.  I'm still not understanding why it's cutting into my model when that's part of the setup.   When I enable stock contours,  which is the whole block I'm cutting down, it actually is worse and cuts right into the rest of the model.

.

[Anonymous]

I think you should report this as a bug. 

[c60nils]

Where's the best place to do that?

Cheers.

 Nils

[narzinskin]

This is not a bug.  2D toolpaths are driven on user input

[c60nils]

Are you saying 2d paths don't care about the model, just the selected geometries?  Or could you explain that better? 

And if that's the case how can one do 2d operations that respect the other model elements.  

I've attached the file in question in case you want to see what's happening.

This seems like something that should work, I shouldn't have to create extra objects just to bound my toolpaths when the entire model is already there.  The parameters for the brace are defined in the user parameters.

Cheers

[narzinskin · Accepted solution]

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@c60nils wrote:

Are you saying 2d paths don't care about the model, just the selected geometries?  Or could you explain that better? 

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That is exactly what i'm saying.  This is the main difference, (outside of 2D chamfer, which is an anomaly) between the 2D and 3D operations in fusion.  If you want the toolpath to be "model aware" you will need to use 3D operations.  If you want to use 2D Contour you will need to manually edit the ends.  i would recommend using separate tangential extension distance on the geometry tab of 2D contour as opposed to tangential fragment extension distance on the passes tab for this example.  This gives you control of the start and end of the toolpath.

[c60nils]

Thanks for the explanation.  I guess I usually use closed contours for most 2d operations.

Nils