Announcement

Collapse
No announcement yet.

plasma cutter and magnetic field

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • madmec
    replied
    Originally posted by camdigger
    I have an older Hypertherm 380. The metal tip on that is electrically live - ie not a drag tip. Newer machines apparently do not have live tips?
    The tip (at least the part you see during operation) aint live on any plasma cutter. It is a Nozzle to focus the arc burning between a tungsten electrode inside the nozzle and the workpiece to concentrate the energy for instantly melting the Material. It needs to be isolated from the Workpiece, otherwise the arc would burn between the Electrode and the Nozzle, overheating the nozzle.

    Greets from germany

    Thomas

    Leave a comment:


  • winchman
    replied
    I hope the cut in the last picture isn't typical of the results you get with your plasma cutter.



    That's really nasty looking.

    Leave a comment:


  • PTSideshow
    replied
    According to Jim Colt of Hyperthrem, it doesn't effect the the air plasma output.
    There are some grades of steel plate that are highly magnetic. In industrial uses we occasionally run into plasma cutting issues (cut edge angularity, short consumable life) when this type of plate is handled with powerful lifting magnets...then put on a plasma cnc machine for cutting. I have seen areas on these plates where....if you dropped a 3/4" wrench on the magnetized area...you would literally have to pry the wrench off the plate!

    Cutting near magnets will not generally have any affect on an air plasma cut.

    Jim Colt Hypertherm
    But even the drive magnets I use from hard drives don't effect it.




    I have since switched to a thicker ply wood ½"¾", as the magnets did pull the screws out after a number of cuts.

    Leave a comment:


  • Evan
    replied
    The question is does the strong magnetic field interact with plasma and make a cut go where it would not have gone without the magnetic field?
    I am sure it will. It sure does affect Mig welding.

    Leave a comment:


  • camdigger
    replied
    Originally posted by wierdscience
    Dunno about the magnets,but my Thermodyne plasma cutter manual specifically recommends against using metallic straight edges and guides. Claims it causes premature wear of the nozzle and electrode.I switched to edges made from 1/4" Masonite and the consumable life tripled.Guess the mfg knows what they are talking about after all
    I have an older Hypertherm 380. The metal tip on that is electrically live - ie not a drag tip. Newer machines apparently do not have live tips?

    Leave a comment:


  • wierdscience
    replied
    Dunno about the magnets,but my Thermodyne plasma cutter manual specifically recommends against using metallic straight edges and guides. Claims it causes premature wear of the nozzle and electrode.I switched to edges made from 1/4" Masonite and the consumable life tripled.Guess the mfg knows what they are talking about after all

    Leave a comment:


  • Astronowanabe
    started a topic plasma cutter and magnetic field

    plasma cutter and magnetic field

    Just a question from the "shop made tools" thread page 144 (that's gross)
    using strong magnets to stick cutting guides to work.

    The question is does the strong magnetic field interact with plasma and make a cut go where it would not have gone without the magnetic field?
Working...
X