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« on: October 24, 2014, 07:39:42 PM »
M6 is a tool change command.
If you have an ATC, it will change the tool
If you don't have an ATC, you can have Mach3 stop and wait for you to change tools when it sees an M6.
You can also modify the M6 macro to do other things. Mine moves to a tool change3 position, and waits. After changing the tool, it measures the new tool, then continues cutting. (I don't use G43)
"That button" effectively calls a G43 (and G49 to cancel G43). I'm assuming that if you want to manually change tools, and apply the offset, you can just click the button, rather than using MDI or g-code.
There are many functions in Mach3 that can have multiple methods to do them.