LinuxCNC is Adding Arc Movements That Do Not Exist In the Program

I am running into a strange issue with this 2D contour. The simulation in Fusion360 does not show anything other than straight lines with the exception of some arcs in the corners. I've also tried plotting it online in NC viewer, and I don't see any arcs along the sides. But when I run this program in LinuxCNC, it is not moving in a straight line along the sides. It's making these little arcs in a couple of seemingly random places. They show up in the plotter in Axis, and I can't figure out why they are there. Any help would be greatly appreciated. They occur during the first traversal around the outside perimeter of this tooling plate I am attempting to cut out.

 

Well, I came here about to send you to the normal bit of the docs that discusses path blending and....it's not that and I am as confused as you.

It isn't clear to me if the unprogrammed move is there in the preview as well as the actual run, my first thought is that it isn't as it looks to only be in the reddish "actual path"

Can you describe the control and feedback system of your machine? I am wondering if this is noise in the machine feedback system. ie, is it steppers, servos, something using glass-scales for secondary feedback?

Do you have backlash compensation turned on? (this is a really wild stretch on a straight move, though)

Does the actual part have a lump/gouge, or is it actually showing up as a step?

Thanks for taking a look at this. There is no feedback from the motion control as far as I'm aware. I do have closed loop steppers, but there is no output from the drivers to the control. They take the step signals and then internally compensate for any feedback from the encoders on the motors. I'm using a 7196S, so I'm not sure if something in the configuration of the board or the hal file could cause that?

I'm not sure how to check for backlash compensation. I will look into that and report back.

The part does not have a lump or gouge. And yes, it is actually moving along that arc path.

There is no backlash compensation configured.

I closed Axis and re-opened it and loaded the program and it's gone. I am not sure if there is an SOP for reloading a new version of a program, but I think it was related to this process. The original version that I loaded, did in fact have those arcs, but I had corrected it and reloaded the program through the context menu, but it was stilll following the original tool path. I deleted the program, reloaded Axis, and all is well. Thanks for the quick response.

Runs fine here.