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General Mach Discussion / Constant Velocity problem with rotary 4th Axis

« on: October 08, 2013, 01:24:54 PM »

I've just added a 4th axis to my K2CNC and I'm having what seems to be a continuous velocity problem. The X,Y,and Z axis seem fine, but the A axis keeps stopping when it hits it's coordinate as if it's in exact stop mode. Has anyone seen this before?

The G-code is coming from RhinoCAM and includes an A-Axis coordinate every 11.25 degrees for some reason when cutting a test cylinder. MechSoft support says there is no way to change this behavior, and I would rather not have to edit the g-code by hand every time I make something.

Here's what it looks like:

Code: [Select]

G00 G49 G40.1 G17 G80 G50 G90
G20
(4th Axis Roughing)
M6 T6
M03 S18000
G01  Y0.0000 Z1.2250 A0.000 F35.
Y0.0000 Z1.1000 A0.000
Y0.0000 Z1.1000 A0.000 F360.
Y0.0000 Z1.1000 A-11.250
Y0.0000 Z1.1000 A-22.500
Y0.0000 Z1.1000 A-33.750
Y0.0000 Z1.1000 A-45.000
Y0.0000 Z1.1000 A-56.250
Y0.0000 Z1.1000 A-67.500
Y0.0000 Z1.1000 A-78.750
Y0.0000 Z1.1000 A-90.000
.....
Every 11.25 degrees the rotary axis stops and restarts. Anyone know how to fix this in Mach3 without editing the g-code?

Thanks!