Here I show what I do not know. I have a c10 board from automation technology Inc .com.I had to tyupe in c10 in the search and at the bottom I clicked on wiering .Thanks again.

You need something like the blue block on this image - this is the relay you need to find.



They can be black, blue, any colour but will look similar.

Have you got a break-out board even??? This will be located at the machine end somewhere.


Please do not just fit any old relay, you could blow your PC very easily.

Dave, I like this board. Where do I get it. Thanks

Ah, this one...

http://www.automationtechnologiesinc.com/products-page/breakout-boards/c10s-bi-directional-parallel-port-interface-card

that board does not have a torch relay fitted, you will need an add-on board i think.

Personally I would get a more plasma oriented board, opto-isolated and fitted with one or two relays.

If you are building a Plasma CNC you will almost definitely need a THC as well, might be worth your time looking at CandCNC.com I think

This is what you are looking for.  I would steer away from the CandCNC products as they are far to complicated for the average DIY plasma cutter

https://www.fasttech.com/product/1001100-ttl-250v10a-ac-relay-module

(;-) TP

Thanks. I just ordered this relay . What does the pwm do? I also ordered a Proma thc.

Only advice i can give is to go steady!

Get the machine up and running, making moves, then add the Plasma and debug that, then add the THC.

Do you have a plasma unit yet?

Is the machine built or is this a rebuild/mmodification/change of purpose thing???

I do have the machine running. I also can cut if I turn on the plasma by hand,I mean turn on and off manually.

Brilliant, thats 95% of the battle won then

Sounds like the relay will do it.

AFIK PWM is for motor speed control on stuff like Routers, mills, lathes etc

wow Dave, I am very happy to know that. I suppose I will wait for my relay and try it out. Thanks for all your help!