I've configured my A axis as linear by unchecking "A axis is Angular" on the General Config page. Nevertheless, when I give a code a move in the negative direction, the axis moves in the positive direction as if it were angular. I have determined that if on the General Config page I uncheck the "Rot 360 Rollover" the axis behaves as I want a linear axis to do.
Unfortunately, this means that I cannot use the Rollover feature on my B or C rotary axes. This appears to be a bug in the Mach 3 software. Does anyone have any comments or suggestions?
By the way, I have also found I can have the axis operate correctly as a linear axis even when the "Rot 360 Rollover" box is checked, but this requires going to Incremental Mode (G91) and out again every time I want to move in the negative direction.