I've been playing with latest test release on a lathe and have some issues. Here is what I've found in last couple of weeks:

Using LinuxCNC PP in Fusion360 as it appears to give best results, tried also Fanuc PP, Mach3 PP and Grbl Turn PP.

1. The acrs are not displayed correctly in UCCNC and the toolpath is wrong. See attached screenshots. In UCCNC the toolpath has sharp edges where arcs meet, no matter if radius acrs are enabled or not. In ncviewer for example the toolpath is nice and smooth.

Gcode for the operation with IK arcs:

- Code: Select all
`N39 M1`

N40 M0 (CHANGE TO T4 ON REAR TOOL POST)

N41 T4 M6 G43 H4

N43 G90 G94 G18

N44 G54

N45 G97 S1150 M3

N46 G0 X22. Z50.4

N47 G0 Z-3.456

N48 X13.543

N49 G1 X10.418 Z-4.704 F500.

N50 G2 X8.939 Z-6.044 I1.248 K-1.563

N51 G3 X6.971 Z-8.486 I-4.87 K0.544 F100.

N52 G2 X5.924 Z-13.33 I3.711 K-2.851

N53 G3 X11.395 Z-22.955 I-27.901 K-13.131

N54 X10.472 Z-29.104 I-16.323 K-1.868

N55 G1 X14.472 F500.

N56 Z-19.904

N57 G0 Z-3.456

N58 X13.543

N59 G1 X10.418 Z-4.704 F500.

N60 G2 X8.939 Z-6.044 I1.248 K-1.563

N61 G3 X6.971 Z-8.486 I-4.87 K0.544 F100.

N62 G2 X5.924 Z-13.33 I3.711 K-2.851

N63 G3 X11.395 Z-22.955 I-27.901 K-13.131

N64 X10.472 Z-29.104 I-16.323 K-1.868

N65 G1 X14.599 F500.

N66 G0 X22.

N67 Z50.4

Gcode for the operation with radius arcs:

- Code: Select all
`N41 M1`

N42 M0 (CHANGE TO T4 ON REAR TOOL POST)

N43 T4 M6 G43 H4

N45 G90 G94 G18

N46 G54

N47 G97 S1150 M3

N48 G0 X22. Z50.4

N49 G0 Z-3.456

N50 X13.543

N51 G1 X10.418 Z-4.704 F500.

N52 G2 X8.939 Z-6.044 R2.

N53 G3 X6.971 Z-8.486 R4.9 F100.

N54 G2 X5.924 Z-13.33 R4.68

N55 G3 X11.395 Z-22.955 R30.837

N56 X10.472 Z-29.104 R16.429

N57 G1 X14.472 F500.

N58 Z-19.904

N59 G0 Z-3.456

N60 X13.543

N61 G1 X10.418 Z-4.704 F500.

N62 G2 X8.939 Z-6.044 R2.

N63 G3 X6.971 Z-8.486 R4.9 F100.

N64 G2 X5.924 Z-13.33 R4.68

N65 G3 X11.395 Z-22.955 R30.837

N66 X10.472 Z-29.104 R16.429

N67 G1 X14.599 F500.

N68 G0 X22.

N69 Z50.4

2. Sometimes the UCCNC control software gets stuck after finishing whole cycle. Entering for example G1 Z0 F500 to bring the tool back to part zero does nothing, on the screen the DTG for Z axis changes to the distance it should travel, but there is no actual move. But G0 (rapid) works. Restart of UCCNC is needed for it to work properly again.

3. Constant surface speed is a bit erratic I think. Although I am not sure how it is supposed to work exactly. But appears to work sometimes, sometimes not as the spindle RPM do not change in either control software or audibly. I can try to replicate it when I have time and make a video if necessary.

Any ideas what could be wrong? Will there be an update soon perhaps?

I will update this thread if I find other issues when I get the lathe running again after I fix some mechanical issues.