( Hans Wedemeyer http://home.swbell.net/hans_w )
( Example using variables and calling subroutines )
( Note! M0 can't be called in subroutine )
( In this example the Z axis is operated manually, because the mill only has
( X,Y control and no Z. Z axis RSN ! )
( Notice the variable V1 is changed between calls to the
( Circle subroutine. Remember this is an example, subroutines can save a lot )
( of repetitive code, although here it looks like a waste... )

V1=0.5   ( Variable V1 is 0.5 )
F5.0     ( feed rate )

( First Circle )
G22 P1   ( Call Subroutine #1 )
M0       ( Lower Z axis to depth )
G22 P2   ( Call Subroutine #2 )
M0       ( Raise Z to safe height )

( Second Circle )
V1=1.0   ( new value for V1 )
G22 P1   ( Call Subroutine #1 )
M0       ( Lower Z axis to depth )
G22 P2   ( Call Subroutine #2 )
M0       ( Raise Z to safe height )

( Third Circle )
V1=1.5   ( new value for V1 )
G22 P1   ( Call Subroutine #1 )
M0       ( Lower Z axis to depth )
G22 P2   ( Call Subroutine #2 )
M0       ( Raise Z to safe height )


M30      ( End of Program )
( Subroutines go after M30 statement )
( Subroutine Name starts with a $  )

$1  ( move to XY )
G00 XV1YV1
M2

$2  ( cut a circle )
G03 XV1YV1I-0.25J0.0
M2