[Jewelry making - Article 00775] - Re: [Orchid] Butane torches

[James Binnion]

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>     mine is completely adjustable, both air, and fuel.Fuel in two
>     ways..I have one that is the older bernzomatic model with
>     detachable base and two orifices that let the user control the
>     amount of fuel released by simply changing to a smaller orifice.
>     The second Is modified with a 76 cent brass fitting that allows you
>     to turn the knurled adjustment nut and control the gas regulation
>     that way as well in addition to the air mixture regulation built
>     in, or the multiple condensing tips available for that particular
>     model. 

    A venturi type mixer that is the heart of all atmospheric air gas
    torches can be adjusted to some degree by controlling the gas flow.
    Since the air flow is controlled by the venturi design and you can't
    adjust the ratio of air to fuel. They are generally not designed to
    have any kind of turn down range and do not mix the air and gas
    properly when you do resulting in a lower temperature flame. They
    also have a tendancy for the flame to become unstable when adjusted
    too far out of their sweet spot. Which is probably why they
    "improved" the model you have to the point where you can't adjust it
    :-) The portability is a great feature when and if you need it. And
    it sounds like this torch is a handy tool but in a studio situation
    where you have access to more permanent facilities my preference is
    for a torch that has full fuel and oxidizer (air or oxygen
    depending) control. And that was what my comment was based on. 

James Binnion
jbin AT mokume-gane.com
James Binnion Metal Arts
http://www.mokume-gane.com
360-756-6550
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