Segments Visible while cutting a 3 Axis circle

[AmitKumar171]

Hi tom,

Thanks for previous replies.

I am using KFLOP+Konnect setup. and output of axis is CW/CCW.
I am facing one problem while machining circle in 3 Axis.
I have generated a 3 axis program for a simple circle in aluminum.

As in the images segment lines for toolpaths are visible in part.
Images, g-codes and trajectory planner settings are attached for the part.

I am not able to identify cause of the above problem.

Is there any parameter in trajectory planner, that causing above problem.? Or what else?

Waiting for your kind reply.

[curtiskelowna]

Hi Amit,

I think the problem is in your gcode.

I opened up the gcode file and I can see that the circle is not using IJK arcs but linear segments. Looks like the length of the segments matches the marks you are seeing:



If you can, switch to arcs when cutting a circle. I would also look at the tolerance/smoothing settings on the CAM side. In Fusion360 CAM there is a setting for "smoothing" which can help smooth out segments on the CAM side

Curtis

[TomKerekes]

Hi Amit,

I agree with Curtis that the pattern appears to be the segments in the GCode. You might change the CAD to output smaller segments. Do you have any way to measure the size of the deviations? I'm guessing they may only be a couple microns. You might want to specify 4 decimals in the GCode. Rounding the coordinates to 1 micron causes a sort of zig-zag path along the arc. Assuming the center of the arc is 0,0 I plotted the variation of radius of the GCode points for lines N90-N110.

Radius err.bmp (561.12 KiB) Viewed 1240 times

Rounding XY to +/- 0.5um each I would have expected the radius to only vary +/- 0.707um. But line N101 is off by more than that so there might be something else going on in CAD.

What is your Coordinated Motion Filter (KLP) set at in KFLOP? You might also try increasing it.