[Jewelry making - Article 00766] - Re: [Orchid] Smith little torch

[Peter W . Rowe]

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>     Not a very good idea --you can expect very ragged flames with a
>     drilled out tip. 

    I never had any problem that way.  Some larger tips sometimes
    produce a flame that seems too high speed at times, which you can
    modify by running a small bud bur into the drill hole about 2/3ds the
    lenth of the bur head, with the size of the bur being only a little
    larger than the drill hole.  It flares the diameter of the exiting
    hole, and the gas stream slightly slows down.  Somewhat like the
    shape of a rocket motor nozzle.  The main visible effect is that the
    flame blows out less easily.  Do note that you need the gas and oxy
    pressures high enough so the flame is still decently brisk if you've
    done this to make a really large tip.  Too low a gas pressure and the
    flame can blow back into the torch body with the little torch, due to
    the small diameter of the gas line hoses, I think, Try, in doing this,
    not to have the exit diameter of the hole much larger than the
    internal bore of the tip tubing itself, for the same reason. 
    Fortunately, even drilling a little torch tip out to it's max, you're
    still not exactly talking about an excessively  large tip, at least
    not with natural gas or propane.  I'd not recommend this with
    acetylene or hydrogen at all. 

Peter

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