(author: Chris P)
(version: 0.4)
(date: 06/27/24)

(Probe back top side for y,z 0,0 position)
(Start probe position is over back edge of stock)
(inside the step off width distance and within max z distance)
(ensure all settings have been set properly according to help diagrams)

o<Probe_back_top_side> sub

  (uses NGCGUI style arg spec)
  (number after "=" in comment is default value)
  #<probe_tool_number> = #3014    (=99)
  #<probe_slow_fr> = #3015        (=0)
  #<probe_fast_fr> = #3016        (=10.0)
  #<probe_traverse_fr> = #3017    (=50)
  #<max_xy_distance> = #3018      (=0.5000)
  #<xy_clearance> = #3019         (=0.1000)
  #<max_z_distance> = #3020       (=0.5000)
  #<z_clearance> = #3021          (=0.1000)
  #<extra_probe_depth> = #3022    (=0.0000)  
  #<step_off_width> = #3023       (=0.5000)
  #<probe_mode> = #3030           (=0)
  #<calibration_offset> = #3032   (=0)

  (Cancel G92 offsets)
  G92.1

  (Cancel Feedrate Override)
  M50 P0

  #<workspace_y> = #[5202 + [20 * #5220]]

  (Probe Tool Safety Check)
  o100 if [#5400 NE #<probe_tool_number>]
      (DEBUG, Specified probe tool %d#<probe_tool_number> not in spindle, aborting)
      M50 P1
      o<Probe_back_top_side> return
  o100 endif

  (Probe Diameter)
  #<probe_diameter> = #5410

  (Probing depth from the z probed clearance height, used for z moves)
  #<z_probe_stack> = [#<z_clearance> + #<probe_diameter> + #<extra_probe_depth>]

  (Call sub "probe_z_minus_sub" to Probe top of Workpiece)
  o<probe_z_minus_sub> call [#3014][#3015][#3016][#3017][#3020][#3021][#3030]

  (Probe Y Positioning Move, Step Off Width)
  G91
  F[#<probe_traverse_fr>]
  G38.3 Y[#<step_off_width>]

  (Probe Y Positioning Move, to Probing Depth)
  F[#<probe_fast_fr>]
  G38.3 Z-[#<z_probe_stack>]

  (Call sub "probe_y_minus" to Probe y- side of Workpiece)
  o<probe_y_minus> call [#3014][#3015][#3016][#3017][#3018][#3019][#3032]

  #<y_minus_zero_edge> = #<_value>

  (value returned safety check, aborts if no value returned)
  o110 if [#<probe_mode> EQ 1 AND #<_value_returned> NE 1]
      (DEBUG, Missing Y Sub returned edge parameter, aborting)
      M50 P1
      o<probe_back_top_side> return
  o110 endif

  (Probe Completion Move to Z Clearance Plane, and Y Zero)
  G91
  F[#<probe_traverse_fr>]
  G38.3 Z[#<z_probe_stack>]
  G90
  F[#<probe_traverse_fr>]
  G38.3 Y[#<y_minus_zero_edge>]

  (probe mode rules for WCO or probe position measuring only)
  o120 if [#<probe_mode> EQ 0]
      (Record Zero in selected axes and WCO)
      G10 L2 P#5220 Y[#<y_minus_zero_edge> + #<workspace_y>]
  o120 endif

  (Reinstate Feedrate Override)
  M50 P1

o<Probe_back_top_side> endsub

M2 (end program)