Z Touch Off

o<touch_plate_z> sub

#<PlateThickness> =      .2505   ( Thickness of your touch plate when proving in the Z orientation, this is used to re-calculate your new zero after touching off )
#<FastProbe> =            10     ( This is the probe speed used for your initial search, this should be a slow value to avoid damaging your tool, but doesn't not need to "crawl"  )
#<SlowProbe> =             5     ( This is the probe speed for the final search, this should be a very slow value to improve the accuracy of the probing )
#<ZProbeRange> =          -.50   ( This is the distance the probe will travel on its initial search before erroring out, should be a negative value )
#<ProbeLift> =             0.10  ( This is the distance the probe will lift off the touch plate prior to starting the second search )
#<ProbeRetract> =         1.00   ( This is the distance the probe will lift from the touch plate after successfulprobing to allow for removal of the plate )
#<tempParam> = #1

( Set current Z position to 0 so that we will always be moving down )
G10 L20 P0 Z0

( Probe quickly for initial contact )
G91
F[#<FastProbe>]
G38.2 Z[#<ZProbeRange>]

( Move off plate for slow search )
F[#<SlowProbe>]
G1 Z[#<Probelift>]

( Pause for 0.5 Sec )
G4 P0.5

( Slow probe search )
g38.2 Z[-2 * #<ProbeLift>]

( Move up to set new zero )
G1 Z[#<ProbeRetract>] F[#<FastProbe>]

( Set Z0 at point where probe triggers with offset of plate thickness)
G10 L20 P0 Z[#<ProbeRetract> + #<PlateThickness>]

o<touch_plate_z> endsub

M2

import linuxcnc

def get_handlers(halcomp,builder,useropts):
    return [HandlerClass(halcomp,builder,useropts)]

class HandlerClass:
    def __init__(self, halcomp,builder,useropts):
        self.halcomp = halcomp
        self.builder = builder
        self.cmd = linuxcnc.command()
        self.stat = linuxcnc.stat()

    # check if linuxcnc is not running code
    def running(self, s, do_poll=True):
        if do_poll: s.poll()
        return s.task_mode == linuxcnc.MODE_AUTO and s.interp_state != linuxcnc.INTERP_IDLE

    # ensure linuxcnc is in the requested mode
    def ensure_mode(self, s, c, *modes):
        s.poll()
        if not modes: return False
        if s.task_mode in modes: return True
        if self.running(s, do_poll=False): return False
        c.mode(modes[0])
        c.wait_complete()
        return True

    # run an MDI command on button press
    def on_button_press(self, widget, data=None):
        print ('MDI button Pressed')
        if self.ensure_mode(self.stat, self.cmd, linuxcnc.MODE_MDI):
            self.cmd.mdi('(MSG, MDI Worked!)')

net MDI-probez gladevcp.probe-z        => o<touch_plate_z>