Definition

M-Code

What is M-Code?

M-codes are the miscellaneous (machine) commands in a CNC program that control functions other than motion — spindle on/off and direction (M03/M04/M05), coolant (M08/M09), tool change (M06), and program stop/end (M00/M30). They work alongside G-codes to run the machine.

Exact M-code meanings vary by control and machine, which is one reason a post processor is tuned per machine.

Also known as

M codemiscellaneous code

Related terms

G-Code

Programming

Post Processor

Programming

CNC

Computer Numerical Control

Canned Cycle

Programming

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