o<go_to_zero> sub
; Lathe specific version

M73
G90
o100 if [#5422 LT 0]
    G0 Z0
    G0 X0
o100 else if [#5422 GE 0]
    G0 X0
    G0 Z0
o100 endif

o<go_to_zero> endsub

M2