Editing Computer numerical control (section)

===M-codes===
[Code Miscellaneous Functions (M-Code)]{{citation needed|date=November 2017}}. M-codes are miscellaneous machine commands that do not command axis motion. The format for an M-code is the letter M followed by two to three digits; for example:

:[M01 Operational stop]
:[M02 End of Program]
:[M03 Start Spindle - Clockwise]
:[M04 Start Spindle - Counter Clockwise]
:[M05 Stop Spindle]
:[M06 Tool Change]
:[M07 Coolant on mist coolant]
:[M08 Flood coolant on]
:[M09 Coolant off]
:[M10 Chuck open]
:[M11 Chuck close]
:[M12 Spindle up]
:[M13 BOTH M03&M08 Spindle clockwise rotation & flood coolant]
:[M14 BOTH M04&M08 Spindle counter clockwise rotation & flood coolant]
:[M15 BOTH M05&M09 Spindle stop and Flood coolant off] 
:[M16 Special tool call]
:[M19 Spindle orientate]
:[M29 DNC mode]
:[M30 Program reset & rewind]
:[M38 Door open]
:[M39 Door close]
:[M40 Spindle gear at middle]
:[M41 Low gear select]
:[M42 High gear select]
:[M53 Retract Spindle] (raises tool spindle above current position to allow operator to do whatever they would need to do)
:[M68 Hydraulic chuck close]
:[M69 Hydraulic chuck open]
:[M78 Tailstock advancing]
:[M79 Tailstock reversing]