[Jewelry making - Article 01611] - Re: [Orchid] Micro pitting in white gold castings

[James Binnion]

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>     i also would like to mention for calibrating your kiln you can
>     obtain ceramic cones from the pottery supply that will slump and or
>     melt at a predetermined temperature f. apparantly pottery glaze is
>     extremely sensitive to slight temp increments the cones are used to
>     confirm the kiln stayed at the particular temp it was set. the
>     cones are very accurate try them 

    Pyrometric cones are only moderately accurate and the method of
    reading them is somewhat subjective. There is a time at temperature
    aspect to how they slump and it requires that you be watching them
    at the time of slumping to get any control of temperature. Digital
    temperature controls have gotten so cheap that it just doesn't make
    sense to not use one. However if you want to use something like a
    cone but with more accuracy get a tempil crayon. It is a crayon that
    melts at a particular temperature and it is much clearer that you
    are at the specified temperature in that the mark it makes melts and
    becomes liquid at the stated temperature. They are accurate to 1% of
    the melting temperature. 

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