When I try to execute a G91 from the MDI window, I get "Unknown G code used" error.

The Status line still shows the machine is in G90 mode.

Mach4 Turn is Fanuc style not Mach3 style...  U is the incremental axis for X and W is the incremental axis for Z.  If you command "G01 U1 Z1" the X will move out 1 inch from its current position and Z will move to part coord Z1.0.

You will also see that G99 is feed per rev and G98 is feed per min.

I attached the MachMotion lathe Gcode manual.. There should be one that also on the MachSupport website.

Thanks,
Andrew

Andrew:

Thanks for this info.

So then, why does the status line in Mach4 Turn show G90?

Andrew:

Thanks for this info.

So then, why does the status line in Mach4 Turn show G90?

I think that is a display issue...

I'm not sure what you mean by that.

I just went through all the codes shown in my "Modals" line, and the following codes are there, but don't appear in the Mach4 Lathe reference:

G15, G49, G67, G69, G90