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Just setup the ref switches machine coordinates positions in the settings
screen, after this you will only need to create an entry in the fixture
table, with the offset you have between the 0,0,0 machine and the machine
fixture origine.

Your Z ref switch is not a ref switch. If you use it as a ref switch you
will have to re-reference the Z axis each time you mout a new part, so your
absolute machine coordinate system for the Z axis will change each time, and
you will loose the software limits functionalities, because they relie on
absolute machine coordinates. You will loose too the possibility to use
program ranges values for Z (to check for program - machine compatibility) ,
because you will never know where you are physically on the Z machine axis.
More i think mach2 has not been fully tested in the mode you want to use it
and there are perhaps other drawbacks, like they are if we switch from mm to
inch for example.

It's better to have a true Z axis homing, and to use your "touch" probe on
the digitize input for zeroing the Z axis through the fixture or better
tools table where you can enter the tool diameter too for compensation. Next
you will have one more offset system (G92) if you do manual work on the
part.

You can do your reference program through a macro, see in screen designer
how Art did this on the 1024.set screens. But your first goto Z safe has no
sense because before the referencing the absolute machine Z = 0 coordinate
can be anywhere. (except if you use perhaps the persistent DRO
functionality). If you have a ref switch on Z, you will always go in the
right direction because mach2 know if you are at left or at right of the
switche (you have to use a half axis lenght ramp).


It should be in your case :

Code ("G53 Z"your Z safe position" ")
Do Button ( 22 )
Do Button ( 23 )
Do Button ( 24 )
Code ("G53 Z"your Z safe position" ")

But normaly we reference Z first, we go to Z safe, and next we reference
other axis.



Best Regards,

Olivier.