forum.cncdrive.com

Hello.
I am building a plasma table with
uc300 eth and uccnc .
I have two breakout boards connected .
My plan was to use one board to controll x and y axis and
The limit switches .
And the other board to controll z axis and the thc signals.

I have the machine connected so the motors are running.
But where do i connect the signal to turn on the plasma arc ? Is it spindle relay m3

Yes M3

It will be fine to use two bobs

What is in M3 ? I found only : exec.DospinCW();

It just activates the assigned output pin when M3 is called.

Yes, but in plasma control the machine movement (motion g-codes execution) also waits for the M3 when the THC control is switched on.
So, in plasma control the M3 is more than just an output pin.

cncdrive wrote:Yes, but in plasma control the machine movement (motion g-codes execution) also waits for the M3 when the THC control is switched on.
So, in plasma control the M3 is more than just an output pin.

Hi Balazs,

I always thought that when THC control is switched on, XY moves only happen when an Arc OK signal is received. So M3 is issued than the system waits for Arc OK to become active before XY moves start, correct ??

Or do you mean it is a combination of the two, i.e. when using plasma you MUST use M3 to start the torch, and only then the system waits for Arc OK before starting XY moves.

So if THC was enabled, and I had my own custom macro M2000 to start the torch (the macro turned on an output that fired the torch for example), then UCCNC would NOT wait for Arc OK before commencing XY moves ???

Keith.