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Plasma CNC, 4'6" × 8'8" v0318

Discussion in 'Laser Cutters' started by polemidis, Mar 10, 2018.

  1. polemidis

    polemidis Well-Known
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    polemidis published a new build:

    Read more about this build...
     
  2. Raymundo Maciel

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    any progress so far?
     
  3. polemidis

    polemidis Well-Known
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    I just cut the custom gantry plates with my cnc router (OX based). Is a slow process as I am alone. The good news is that I have solved all of the problems, I just have to document it now, and confirm that it actually works. Feel free to ask any questions if you are in rush (until I update the build)
     
    Mark Carew likes this.
  4. polemidis

    polemidis Well-Known
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    Now that I re-read my build, I realized that I have made a lot of changes. The frame is lighter (1"x 3" rectangle tubing). Also the cut-50 plasma cutter is replaced with the Harbor Freight Plasma cutter, for a good reason. No High Frequency pilot start! It removes lots of headaches on crazy grounding and shielding
     
  5. polemidis

    polemidis Well-Known
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    Updates guys, the machine is up and running! We are updating the CAD files for now, and soon we are going to take lots of pictures (yes!) and videos (yes²). If anyone wants to contribute feel free to do so. Its on github.
    In the meanwhile if you have any questions let me know. We will have a nice presentation soon!
     
    Mark Carew likes this.
  6. Karl Miller

    Karl Miller Well-Known
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    How is the HF plasma cutter performing?
    What's your max thickness?
    How fast cann it cut?
    Have any feeds and speeds?
     
  7. polemidis

    polemidis Well-Known
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    I am building a air dryer now before i waste all the consumables. I will do some testing this week. I know I have cut 3/8" thickness easy. No speeds yet.
     
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  8. Tracy Ranson

    Tracy Ranson Journeyman
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    I am interested in how you are going to avoid electrical interference (noise) between wires without using shielded wire or other noise canceling devices.
     
  9. polemidis

    polemidis Well-Known
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    I do not need any shielding because there is no noise created :) I only got a false trigger on the Z probe a few times but I moved it outside of the cable chain and it works fine. The truck is to use a plasma that does not have a HF pilot arc
     
    #9 polemidis, May 15, 2018
    Last edited: May 15, 2018
  10. Tracy Ranson

    Tracy Ranson Journeyman
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    It is my understanding that all electronic devices create electrical noise that vary in intensity. I am not an engineer, I am not an expert in the field,so I ask questions especially when I am perplexed. I would like to explore this no electrical noise further, perhaps you could share your information in more detail. Please and thank you.
     
  11. polemidis

    polemidis Well-Known
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    I have not knowledge in that field. I know that when people mention noise and interference in plasma systems is because of the High Frequency (about 3Mhz) high voltage ( a few thousand) pilot start of the plasma.
    Now without being an expert, the 24V-36v that go through the motors, the 5v that go through the probe and the 200-300V max that the plasma electrode carries are not enough to cause any interference to the wires next to them.
    Sorry I cannot analyze this matter more, but if you have questions about the system I will be glad to answer them all. The project is already public on github and it’s open source for non commercial reasons to anyone. Feel free to ask anything and I will try my best
     
  12. wastelandfab

    wastelandfab Journeyman
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    I also use a pilot arc start (not high frequency start) and have also had ZERO issues with interference. I also have my controller mounted inside of a computer case, about 10 feet away, inside a cabinet. When I was using the tinyg controller, I had some minor issues, but only if the plasma arc ran off the metal (causing random arcing). I would not want to try to use a HF start plasma, it just sounds like a nightmare from what I read from other people. I would like to see some more pics of your set up!
     
    polemidis likes this.
  13. polemidis

    polemidis Well-Known
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    Some very rough pics of my so far setup are on the git. I am almost done building an air drier, after that I will start on videos.
     

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