@JoergS5
Thanks Joerg, My large CNC creeps a little while shut down, so its always
zero out homing before anything. Once I get this new one further along , I'll share some pictures. If all goes well, it will be a purpose built 3 function device (Hot End/Spindle/CO2). I've been very pleased with the 6HC, quite a step up from my Duet 2 Ethernet, which runs fantastic on the delta.
Biff

@JoergS5
Thanks Joerg, My large CNC creeps a little while shut down, so its always
zero out homing before anything. Once I get this new one further along , I'll share some pictures. If all goes well, it will be a purpose built 3 function device (Hot End/Spindle/CO2). I've been very pleased with the 6HC, quite a step up from my Duet 2 Ethernet, which runs fantastic on the delta.
Biff

@JoergS5
Thanks, but I want to square up this Z axis in the same manner that I do with the Dual Y carriage drive on my 1x1.5M Gantry CNC.
This one will not be relegated to only 3D printing.
I may have to go back to pursuing the split axis path.
Thx Biff

@JoergS5
Ok, great progress, I'm guessing I morphed a some 2.x and 3.x ideas.
Z is homing and both motors stop according to they're respective MAX endstops, thanks for the quick response !
Since we're not separating Z & U, Any ideas on how I deal with small differences in the triggering of Z & U to correct slight mounting errors?

I'd added the U current setting in the middle of my testing though it's remove now, per the post you sent me to.

"Example: If you have two motors on your Z axis, physically connected to Z and E0 stepper drivers, configured with M584 Z2:3, set M906 Z200, not M906 Z200:200"

Tkx
Biff

M122.txt
config.g
homez.g

I've read, I've tested, now I'm learning to ask for help, Please.
I built a 1 Meter Delta that's running an Duet 2 Ethernet very well.
Now have built a 500x500x500mm Cartesian.
Duet 3 6HC / RRF ver 3.1.1
Single X & Y Belt Drive / Hall Effect endstops
Dual Z Lead Screw Drive / Dual Hall Effect endstops at the top
Z axis (and U) together moving great
Initial Z Homes without splitting the pair and using just the Z endstop worked fine.
I can not seem to achieve Z & U (split) homing movement using the attached files.
Z moves, U just stares at me....
Thanks
Biff