hot wire cutting

..

ok so to me it looks like a simple photo coupler digital output. That said I don't know how your system is
put together. I use Mesa boards for control when Linuxcnc is involved. With that said I can only give
a general direction. If it were me I would wire the photo coupler output into an input pin, go through the
linuxcnc 2.9 manual (section 11.3.2) use the pause / resume example and test from there. When I
was first starting out with Linuxcnc I would set up multiple different profiles for the same machine
then add one or 2 things in to see how pncconf or stepconf would write the connections and play
around with it from there.

On second thought you will need to use some form of ladder logic to prevent the pause button from being activated
while no Gcode is running . That way you can make a latching relay type of circuit. You could use an M code to arm
the relay and just put it in every Gcode right after the wire is turned on. You will probably want some sort of " READY "
button so that once a new wire is in place it wont immediately continue the program until YOU are ready for it to do so.

  If I recall in most CNC machines when the Pause button is pressed the spindle will keep spinning unless other
lock outs are integrated into it. I am pretty sure you are using the " Spindle " for temperature control. You may
want to use the ladder logic again to inhibit the wire from getting hot until the wire is reconnected and the ready
button is pressed.

  Also you may want to integrate a timer so that when the READY button is pressed the machine will delay resuming
Gcode operations for a short time to allow the wire to get to temp or close to it then continue operations.

With that said I have some tutorials for you that another member on this forum had put together . I found they really
helped me get up to speed on how to use classic ladder

www.youtube.com/results?search_query=the+feral+engineer+ladder





 

Another possibility would be to utilize the spindle at speed section of Linuxcnc. Manual sections 5.6.2 and 5.6.2.1.
if you want to use classic ladder you may also want to explore the linuxcnc manual section 8
 

Thank you for the tips, I will look into it in a few days. If something works or not, I'll let you know. As I was running the machine it stepconf was run sometimes a dozen times an hour, well it finally worked. And that's the only thing I lack complete satisfaction and sooner or later I'll figure something out.