Automatically shut off air in Gcode..

[JAZZCNC]

Thanks Jazz, will read up on brains now.. That sounds exactly like what I had in mind.
Do you happen to know if , while the brain is happening, I can also switch on & off the flood with the button for "Flood ctrl-F" on the fly without messing up everything.. (for example if I have a move in the negative Z, but one that I know isn't cutting anything at the time..)

Ok well not exactly sure what your asking here.? Are you asking if the Brain can do this or if you can do this while the brain is running.?

Brains run all the time in the background and only watch the things they are setup to watch so won't affect anything other than what asked to do.
They are very powerful things when used correctly, they can also be run at same time has Macro pump. They are also much faster than macro pump which is what you want for something like this.

I've attached a Brain called Relay. This turns ON the OUTPUT #1 when the Z axis goes lower than 0.1 and off when above. To use this just unzip it and copy into the folder called brains in Mach3 folder.
Then open Mach3 and go to Operator Menu and select Brain Control. From the List select the Brain called Relay and on right select Enable. Now close Brain Control and it should be working.

To test this goto diagnostics window and jog Z axis down and the #1 output Led should start flashing. ( Output #1 will need to be enabled in portsn pins)