M9 ; COOLANT OFF (optional)
M5 ; SPINDLE OFF
M25 ; PAUSE
G28 ; GO TO MACHINE RETURN POSITION (OPTIONAL)
T6 M6 ; ESTABLISH NEW TOOL ID (t6 IN THIS CASE)
G43 H6 ; FETCH TOOLING HEIGHT AND OFFSETS FROM MACHINE DEFININTIONS
M3 S1800 ; SET NEW SPINDLE SPEED, AND MOTOR ON
G4 P6.00 ; OPTIONAL WAIT DELAY FOR SPINDLE TO RUN-UP (SIX SECONDS, HERE)
M8 ; COOLANT ON (OPTIONAL)