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Looking for a board to control CNC Plasma Cutter

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  • undefined
    fall-apart-dave
    last edited by 23 Feb 2021, 10:45

    Hello. I am looking for a controller to build a CNC plasma cutter.

    I am really down to the OpenBuilds Black Box, and the Duet3D.

    Does anyone have any experience using the Duet3D for this application? There's lots out there about Openbuilds but nothing much I can find with the Duet.

    Any advice or thoughts would be most welcome.

    Thank you in advance.

    1 Reply Last reply Reply Quote 1
    • undefined
      dc42 administrators
      last edited by 23 Feb 2021, 12:29

      Is the control of a plasma cutter similar to a laser cutter? How does the plasma device need to be controlled?

      Duet WiFi hardware designer and firmware engineer
      Please do not ask me for Duet support via PM or email, use the forum
      http://www.escher3d.com, https://miscsolutions.wordpress.com

      1 Reply Last reply Reply Quote 0
      • undefined
        fall-apart-dave
        last edited by fall-apart-dave 23 Feb 2021, 13:38

        Hello

        Just on/off funciton, closing an opening a circuit... No no PWM or anything. There would never be a situation where I would need to automatically change the plasma stream on the fly by machine.

        The Openbuilds black box has a relay specifically for this purpose. I guess I would need to add one on the Duet?

        undefined 1 Reply Last reply 23 Feb 2021, 13:51 Reply Quote 1
        • undefined
          dc42 administrators @fall-apart-dave
          last edited by dc42 23 Feb 2021, 13:51

          Does it switch power to the circuit, or does the circuit have a separate control signal; and if so, what voltage does the control signal need? If the plasma controller is a commercial unit, can you link to a datasheet for it?

          Duet WiFi hardware designer and firmware engineer
          Please do not ask me for Duet support via PM or email, use the forum
          http://www.escher3d.com, https://miscsolutions.wordpress.com

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          • undefined
            fall-apart-dave
            last edited by fall-apart-dave 23 Feb 2021, 15:27

            Hi. Thanks for a swift response!

            The cutter is an RTEC P50HF, from R-Tech Welding in the UK.

            I tried to post a link but the forum said I was a naughty boy and trying to spam it, so I've had to delete. Sorry.

            There is a circuit diagram in the manual, on the page there.

            The switch is a control signal, you wouldn't put a plasma cutter power feed through a button. I think the control is just looking for a ground, rather than a voltage.

            EDIT

            Link here:
            https://www.r-techwelding.co.uk/plasma-cutter-r-tech-p50hf/

            I guess I am wondering if the board is fairly resiliant against interferance, and how easy it would be to use for this purpose.
            I'm aware that shielding and grounding will be crucial, the cutter has a dedicated earth for attaching to CNC benches etc. I'm an offshore Survey Electronics Engineer by trade so routing out and nailing down interference is very much within my day to day work, so the usual things like removing earth loops, grounded cable shielding, twisted pairs, and sensible cable routing will be employed.
            I also wonder just how I would actually use a duet as it has a superior spec than that of the black box, but OpenBuilds has some driving software for the blackbox controller that is already delveloped and there.

            I don't really want to reinvent the wheel, I tried that once with a 3D printer and ended up with, more or less, an Anet A8 with a fancy frame.

            1 Reply Last reply Reply Quote 3
            • undefined
              jay_s_uk
              last edited by 23 Feb 2021, 15:31

              I've upvoted your posts so try posting the manual again. Should reduce the risk of it being flagged as spam

              Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is

              1 Reply Last reply Reply Quote 2
              • undefined
                fall-apart-dave
                last edited by fall-apart-dave 23 Feb 2021, 15:38

                @jay_s_uk said in Looking for a board to control CNC Plasma Cutter:

                I've upvoted your posts so try posting the manual again. Should reduce the risk of it being flagged as spam

                Thanks. Wouldn't let me add another post but it let me edit the post.

                1 Reply Last reply Reply Quote 1
                • undefined
                  dc42 administrators
                  last edited by dc42 23 Feb 2021, 21:23

                  Thanks. There doesn't seem to be an external input to turn the plasma on/off, but the wiring diagram shows a "torch switch". To turn the plasma on/off, would you plan to use a pair of relay contacts in parallel with (or in place of) the torch switch?

                  Duet WiFi hardware designer and firmware engineer
                  Please do not ask me for Duet support via PM or email, use the forum
                  http://www.escher3d.com, https://miscsolutions.wordpress.com

                  undefined 1 Reply Last reply 23 Feb 2021, 22:21 Reply Quote 0
                  • undefined
                    fall-apart-dave @dc42
                    last edited by 23 Feb 2021, 22:21

                    @dc42 said in Looking for a board to control CNC Plasma Cutter:

                    Thanks. There doesn't seem to be an external input to turn the plasma on/off, but the wiring diagram shows a "torch switch". To turn the plasma on/off, would you plan to use a pair of relay contacts in parallel with (or in place of) the torch switch?

                    Indeed no seperate plasma on/off as with some cheaper cutters. This one has an integral switch in the torch, with the wires incorprated into the Euro torch. So the plan would be to use a relay (as per the Black Box) to make and break this connection.

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                    • undefined
                      dc42 administrators
                      last edited by 24 Feb 2021, 14:25

                      That should work. The fan outputs of all modern Duets have built-in flyback diodes, so they can drive relay coils directly.

                      Duet WiFi hardware designer and firmware engineer
                      Please do not ask me for Duet support via PM or email, use the forum
                      http://www.escher3d.com, https://miscsolutions.wordpress.com

                      undefined 1 Reply Last reply 2 Mar 2021, 14:34 Reply Quote 0
                      • undefined
                        fall-apart-dave @dc42
                        last edited by 2 Mar 2021, 14:34

                        @dc42 said in Looking for a board to control CNC Plasma Cutter:

                        That should work. The fan outputs of all modern Duets have built-in flyback diodes, so they can drive relay coils directly.

                        Thanks

                        So, now just the question of if the extra expense and lack of well trodden path is worth the difference in performance! 🙂

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