Calibrating independent Z axis

[brian]

There are two z axis outputs on the duet wifi. There used to be some info in the old wiki about configuring them, but in the new wiki there isnt anything! I think the second z axis was defined as U. So in this line M92 X640 Y640 Z3200 E620 i expect if U3200 was added after the Z3200

then it would be defined, like M92 X640 Y640 Z3200 U3200 E620
but i am not sure, also not sure if it needs to be stated elsewhere in the config.g file, for example in either of these lines;

M569 P3 S1 ; Drive 3 goes forwards
M350 X128 Y128 Z128 E32 I0

i've been using it as above but now want to change the x y z from 128 to say 64.

Can anyone give me some specific examples for these lines?

thx

[dc42]

The two outputs labelled Za and Zb are connected in series to a single motor driver. So to use them you don't need to create an additional axis.

It's also possible to connect one Z motor to Za and the other to the E1 motor output. In this case you would use the M584 command to tell the firmware you have done this:

M584 X0 Y1 Z2:4 E3

You can use motors connected in this way to do bed leveling if you have a Z probe. You don't need to create an extra axis unless you want each Z motor to have its own endstop switch.