4th axis simultaneous movement with x,y,and z

Mill
1

I am trying to profile a round bottom helix groove with fillet at interface of the groove with the cylinder. The 4th axis is setup as an A stage.

After stumbling thru the cam program and post processor definitions to get the G93 inverse time feedrates to output a reasonable gcode, when I execute the gcode only the 4th axis moves, the linear axes are stationary.

When I input the lines of GCODE in the MDI line, the linear and rotary axes will move simultaneously. For the spiral helix, the moves are only in X and A. Here are the first lines of my GCODE:

%
(DATE:03/03/24 TIME:07:51:27)
G90 G54 G64 G50 G17 G40 G80 G94 G91.1 G49
( / MUDDY-MOLD-INSERT)
G30
T12M6
S5140M3
M8
G0X-2.0006Y0.A180.
G43Z1.H12
G1Z.9755F100.
Z.5755F2.
G93
G1X-1.999A181.754F339.2
X-1.9974A183.452F349.8
X-1.9955A185.501F290.1
X-1.9937A187.467F302.7

Any help would be greatly appreciated.

Thanks,
Kirk

2

Nevermind. I wasn’t looking at the digital readout, I was trying to see the table move. Pitch and rotation was so slow I couldn’t see it. With the spindle running I couldn’t hear the x axis. When I did MDI, spindle was off.

I was limiting my PP to output +/- 360 degrees which caused undesirable rewinding without retracting in z. Changed the PP so it could output many revolutions of plus or minus travel. Fortunately I was only cutting air.

This 4 axis machining is a different world.

3

@Kirk_Miller thanks for the update,I earmarked this post to try out so I’m glad to hear that you got it sorted.