Hey folks, I'm in the process of setting up a CNC plasma table using Mach4. From the Plasma_Configuration PDF included in the docs folder, I can see that I need to configure the torch height controller to use an Out-of-Band (OB) axis. But, I can't find any documentation elsewhere for how to actually set that up.

My Z axis is configured for motor 2. I've copied those settings to Motor 3:


And I've told Mach4 to use Motor3 as OB1 (axis 6):


And I've configured the THC to use axis 6:


What I can't figure out is: How do I tell Mach4 that motion commands intended for Motor 3 should actually move Motor 2?

This feels like something I might need to configure at the motion controller level (I'm using a PMDX-411, plugged into the PMDX-122 that we used to control the machine with Mach3) but PMDX's forums are down so I can't ask there. Hopefully I'm missing something obvious in Mach4?