Reading between the lines this looks like the old problem that laser and 3D extrusion printer users face where they want to activate/deactivate the laser or extruder mid travel to avoid burns or over deposits.

This is exactly what Art created the E commands for but apparantly these got broken some releases back. One commonly used workwround was to use a spare axis DIR signal to toggle the required output.

It's discussed in various threads - here's one example. Tweakie's your man I think for this technique.

http://www.machsupport.com/forum/index.php?topic=18263.0

Ian

Here is the test Gcode and the BRAIN. Load up the brain and run the Gcode. It move until it gets to the target point then shuts off the mist. At the next corner the Mist turns on with the Gcode and then when it gets to the target point it shuts off the mist, etc,etc

f100
m7 g01 x44.18
m7 g01 y-30
m7 g01 x0
m7 g01 y0
m30

Hope that helps, (;-)TP

Sorry to be obtuse, but what is a "brain" and exactly how do I load this code into it?

thanks,
-jim

You are going to have to do some reading and watch the videos on Brains

(;-)TP