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Resistance wire - calculating input

Discussion in 'Beginner Electronics' started by suryah, Feb 21, 2005.

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  1. suryah

    suryah Guest

    I'm making a hot wire cutter for polystyrene foam. Thw cutting wire will be
    Nichrome.

    Does anyonw know of a formula that will give me the means to calculate
    possible voltage and amperage combinations to put through it (so I don't
    melt the wire)?

    I know that a 9v 1A setup will work, but I would like to know what others
    could be used.
     
  2. Rich Grise

    Rich Grise Guest

    For styrofoam, just get a decent bread knife. An X-acto, or even a razor
    blade, is good for small pieces.

    Don't try to cut styrofoam with a hot wire. If it gets anywhere near
    hot enough to "cut" the foam, it melts it and you get a globby mess.

    Or, dip the wire in glue and drag it through sand, and make a little saw
    out of it.

    Good Luck!
    Rich
     
  3. suryah

    suryah Guest

    Thanks for the link. It's not dangerous. I know that the stated setup works.
    It's just that other PSU's are more easily obtainable, and I wondered which
    would work and which would not.

    Hot wire cutters are often used in trade and by hobbyists - particularly
    model railroaders. Woodland Scenics sells them - but I'm not going to pay
    their prices!
     
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