;Facing
o<facing> sub

  o<backup_status> call

#<facing_ss>  = #1
#<facing_maxrpm> = #2
#<facing_feed>  = #3
#<facing_doc>  = #4
#<facing_tool>  = #5
#<facing_coolant> = #6
#<facing_angle>  = #7
#<facing_x>   = #8
#<facing_z>   = #9

        o10 if [#<facing_angle>NE 0]
           (MSG,Angled facing isn't supported yet)
        o10 return [-2] ; indicate failure to epilog
        o10 endif

        o100 if [#<facing_tool> NE #<_current_tool>]
             (MSG,ERROR : Set tool before use macro)
        o100 return [-2] ; indicate failure to epilog
        o100 endif

G7  ; diameter mode
G18 ; XZ Plane
G21 ; Metric Units
G90 ; Absolute Distance

#<starting_X> = [#<_x> * 2] (starting X)
#<starting_Z> = #<_z> (starting Z)

G96 D#<facing_maxrpm> S#<facing_ss> ; Constant Surface Speed Mode
M3                ; Start Spindle
G95 F#<facing_feed>  ; Feed-Per-Rev Mode
G4P1              ; Wait to reach speed

        o110 if [#<facing_coolant>]
                M8
        o110 endif

(DEBUG,facing finish rad-#<facing_x> start rad-#<starting_X> start length-#<starting_Z> finish length-#<facing_z>)

        o200 while [#<starting_Z> GT #<facing_z>+ #<facing_doc>]
             #<starting_Z>=[#<starting_Z>-#<facing_doc>]
             G1 Z#<starting_Z>
             G1 X#<facing_x>
             G0 Z[#<starting_Z>+#<facing_doc>]
             G0 X#<starting_X>
             G0 Z#<starting_Z>
        o200 endwhile

        G1 Z#<facing_z>
        G1 X#<facing_x>
        G0 Z[#<starting_Z>+#<facing_doc>]
        G0 X[#<starting_X>+#<facing_doc>]
        G0 Z#<facing_z>; For touch-off

M5
M9

  o<backup_restore> call     ; restore g20/21, g90/g91, feedrate cuter-comp and other using now global _backup_var

o<facing> endsub

M2
%