problem in UGS sender with Fusion 2D contour toolpath

[Anonymous]

Hi,

Im having a problem in UGS sender when using a 2D contour toolpath generated with Fusion 360.

When the toolpath contains arcs, my CNC controlled with UGS does straight lines instead of arcs.

The toolpath shows a red arc instead of a blue arc.
This doesn't occur when I generate a toolpath using other CAM operations from Fusion 360 like 2D trace.

Then the arc toolpath in UGS sender shows as a blue arc and everything is fine.

I need the 2D contour operation to generate tabs in my toolpath.

Any Ideas how to fix this problem? Im not sure if it's an Fusion 360 problem or a UGS sender problem. My CNC is able to do arcs in operations send by UGS sender but just not with this 2D contour operation.

not working red arc from a 2D contour toolpathworking blue arc from a 2D trace toolpaththe toolpath I try to run with 2D contour operations with tabs integrated. not working 

[seth.madore]

The Trace toolpath doesn't actually produce arc movements, but very small point-to-point line moves. I don't think I've heard of UGS not supporting arc moves, but I suppose it's possible.

What post processor are you using?

[Anonymous]

I use the Grbl / grbl post processor 

[Anonymous]

These are the .nc files

[seth.madore]

And all, or none of these above files will run on your machine?

[Anonymous]

the 9 rings file and the boogje contour file wont run correctly.
Both turn arcs into straight lines.

[seth.madore]

Is it the display that's wrong, or does it actually cut wrong? What happens if you lift the tool well above the part and run it? Does the UGS need any updates?

[Anonymous]

Both in the display and the machine run wrong. Instead of arcs it makes straight lines. 

[seth.madore]

Is your UGS software up to date? This post processor has been out for quite some time, and I think this is the first report I've seen of it not working. Is there a UGS user forum where other users are saying the same thing?

[seth.madore]

We can eliminate all arc moves from your post processor if you want, it's a simple edit.

Open up your post processor in your favorite text editor. Change this line:

allowedCircularPlanes = undefined; // allow any circular motion

to this:

allowedCircularPlanes = 0; // allow any circular motion

[Anonymous]

Yes!!,

Someone from a UGS forum solved it. Apparently I needed to check a box in settings to enable arc movements. This solved my problem. 
Thanks for the help! 

My UGS is up to date as well. Heres a picture of the solution.