gCode to move to top of Z axis

[pdx_curious (Curious in Portland)]

I am looking for the gCode command to move the router to the top of the Z axis.

This will be part of a script to use the probe to zero the Z axis. I am not using the Carbide 3D probe. Once set, I want to move the router to the top of the Z axis so I can reattach the dust boot and get back to work.

If it matters, I am setting the Z axis zero to be the top surface of the work piece.

If I could home the Z axis that would be good. But as near as I can tell the only homing command available works on all three axis and the movement in X and Y direction would be counterproductive.

I am using GRBL 1.1 and Carbide Motion 4

[neilferreri (Neil Ferreri Ω)]

G53 Z0 is the top of the axis, but that’s also your limit switch. G53 Z-5 is 5mm (if you’re in G21 / mm mode) below the limit switch.

[mikep]

But keep in mind this will change your coordinate system, I don’t know how to tell what coordinate system it was in before you do this so you can put it back.

[neilferreri (Neil Ferreri Ω)]

@mikep

But keep in mind this will change your coordinate system

G53 does not change the work coordinate system. It is non-modal, which means it only affects the lines it is on.

@mikep

I don’t know how to tell what coordinate system it was in before you do this

$G will report the current modal state which will tell you your WCS among lots of other stuff going on.

[mikep]

Wow, I didn’t there were any non-modals for that, that’s great to know!