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(author: Chris P)
(version: 0.1)
(date: 04/25/19)

(Probe Z Minus direction to locate top, end at clearance distance)
(Start probe position is over stock within max z distance)
(ensure all settings have been set properly according to help diagrams)

o<probe_z_minus> sub

  (uses NGCGUI style arg spec)
  (number after "=" in comment is default value)
  #<probe_tool_number> = #1
  #<max_z_distance> = #2
  #<z_clearance> = #3
  #<probe_slow_fr> = #4
  #<probe_fast_fr> = #5

  (Current Z Position including offsets in current program units)
  #<z> = #5422

  (Initial Fast Z- Probe)
  G91
  F[#<probe_fast_fr>]
  G38.2 Z-[#<max_z_distance>]
  #<z_minus_probed> = #5063

  (Probe Error check, #5070 will be 0 if failed)
  o<120> if [#5070 EQ 0]
    (back to start point and feed)
    G90
    G0 Z#<z>
    F[#<probe_fast_fr>]
    (return from sub)
    o<probe_z_minus> return
  o<120> endif

  (Move to z_clearance height for slow probe)
  G90
  G0 Z[#<z_minus_probed> + #<z_clearance>]

  (Slow Probe Rule, if Slow Probe FR is set to 0, Slow Probe is Bypassed)
  o<130> if [#<probe_slow_fr> GT 0]
    (Initiate Slow Z- Probe)
    G91
    F[#<probe_slow_fr>]
    G38.2 Z-[#<z_clearance> * 2]
    #<z_minus_probed> = #5063
;    (debug, Probed Pos: #5063 Z Pos: #<_z>)
    G90
    G0 Z[#<z_minus_probed> + #<z_clearance>]
  o<130> endif

  (defines the edge as z_probed_position for DRO reporting)
  #<z_minus_probed_position> = #<z_minus_probed>

  (analog aio output to gui DRO "Z PROBED POSITION")
  M68 E7 Q[#<z_minus_probed_position>]

  #<z_finish_height> = [#<z_minus_probed> + #<z_clearance>]

o<probe_z_minus> endsub [#<z_finish_height>]

M2 (end program)

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