Machsupport Forum
Mach Discussion => Mach4 General Discussion => Topic started by: ecapstone on March 12, 2026, 10:55:29 PM
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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:
(https://i.imgur.com/UpDtHSL.png)
And I've told Mach4 to use Motor3 as OB1 (axis 6):
(https://i.imgur.com/DnnIwJX.png)
And I've configured the THC to use axis 6:
(https://i.imgur.com/XqdFtpm.png)
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 (https://www.pmdx.com/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?