(info: Face X)
o<facex> sub
#<x-start> = #1 (=0.5 X Start)
#<x-end> = #2 ( X End)
#<rpm> = #3 (=1800 RPM)
#<feed> = #4 ( Feed Rate)

G90
M3 S#<rpm> F#<feed>
G1 X#<x-end>
G91 G0 Z0.1
M5
G90 X#<x-start>
G91 Z-0.1
G90
o<facex> endsub