The table top of my cnc is 38”x24” and sitting at the end of the table my home position is at the top right. The total travel of the Z axis is 6” and when I use the probe to set the cnc for a cut the probe raises the Z axis by 1” and then all DRO’s reed 0.

I have 2 limit switches on the Z axis, one at the top (that’s the X+/ Home) and one at the bottom (which is the Z-). When I set the soft limits on Mach3 I use for the X axis 22” for the Y axis 36” and for the Z I’m not sure what I should use, perhaps +1”?

Hi,
Soft limits in Mach have always been in Machine coordinates.

If the very top of the Z axis travel is your Z axis Home switch then that will be machine 0 for the Z axis. The lower limit is 6 inches lower so that will be machine coordinate -6.

So your  Z SoftLimit Max = 0 and your Z SoftLimit Min = -6

Craig

Thanks Craig, I will do so

Nicolas