Code reference
CNC Wood Router M-Codes List (GRBL and Beyond)
A wood router's working M-codes are a short list: M3/M5 spindle, M0 pause, M2/M30 end, and the coolant pair M8/M9, usually rewired to dust collection or air.
Lawrence Arya··4 min
Practice
G-Code for Automatic Tool Changers on Wood Routers
On an ATC router the file just says T2 M6; a macro does the choreography. Here is the sequence, the rack vs carousel difference, and the per-tool Z that matters.
Lawrence Arya··4 min