Fresh start, using JT's tool. https://git.cnckloon.nl/Ton/Mesa_2019/wiki
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o<change> sub
;(debug, in change tool_in_spindle=#<tool_in_spindle> current_pocket=#<current_pocket>)
;(debug, selected_tool=#<selected_tool> selected_pocket=#<selected_pocket>)
;otherwise after the M6 this information is gone!
#<tool> = #<selected_tool>
#<pocket> = #<selected_pocket>
; we must execute this only in the milltask interpreter
; or preview will break, so test for '#<_task>' which is 1 for
; the milltask interpreter and 0 in the UI's
O100 if [#<_task> EQ 0]
(debug, Task ist Null)
O100 return [999]
O100 endif
;first go up
G53 G0 Z[#<_ini[CHANGE_POSITION]Z>]
; then move to change position
G53 G0 X[#<_ini[CHANGE_POSITION]X>] Y[#<_ini[CHANGE_POSITION]Y>]
; cancel tool offset
G49
; using the code being remapped here means 'use builtin behaviour'
M6
O200 if [#<_hal[gmoccapy.toolmeasurement]> EQ 0]
O200 return [3] ; indicate no tool measurement
O200 endif
G53 G0 X[#<_ini[TOOLSENSOR]X>] Y[#<_ini[TOOLSENSOR]Y>]
G53 G0 Z[#<_ini[TOOLSENSOR]Z>]
O300 if [#<_hal[gmoccapy.searchvel]> LE 0]
O300 return [-1] ; indicate searchvel <= 0
O300 endif
O400 if [#<_hal[gmoccapy.probevel]> LE 0]
O400 return [-2] ; indicate probevel <= 0
O400 endif
F #<_hal[gmoccapy.searchvel]>
G91
G38.2 Z #<_ini[TOOLSENSOR]MAXPROBE>
G0 Z2
; This is commented out only for sim.
F #<_hal[gmoccapy.probevel]>
G38.2 Z-4
O500 if [#5070 EQ 0]
G90
O500 return [-3] ; indicate probe contact failure to epilog
O500 endif
G90
G53 G0 Z[#<_ini[CHANGE_POSITION]Z>]
#<touch_result> = #5063
#<probeheight> = #<_hal[gmoccapy.probeheight]>
#<blockheight> = #<_hal[gmoccapy.blockheight]>
;(DEBUG, #<touch_result> #<probeheight> #<blockheight>)
G10 L1 P#<tool> Z[#<touch_result> - #<_hal[gmoccapy.probeheight]> + #<_hal[gmoccapy.blockheight]>]
G43
;G10 L1 P#<tool> Z#<touch_result>
;G10 L2 P0 Z[#<workpieceheight> + #<probeheight> + #<touch_result>]
; signal success be returning a value > 0:
o<change> endsub [1]