[Jewelry making - Article 00513] - Re: [Orchid] 18k white gold casting problems

[James]

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    Hey Brenda what H & S said sounds right, The first thing to look at
    is your thermocouples (pyrometer probe) they can go bad and or fail
    right out of the box, my experience is that as they age they read
    right at low temp but are off 100 or 200 =BA F above 1000 =BA F. I kee=
p a
    control or unused pyrometer just to test temperatures. I would need
    to see the orange peel surface, but it might be that your oven isn't
    reaching the peak temperature. (improper burnout due to worn
    thermocouple) 

    About the investment check with Kerr about its "Breakdown or Melting
    temperature" You might find its close to the casting temp. of the
    alloy. If that is the case you will have problems with the investment
    forming a hard layer on the cast part. 

    Also Hoover and Strong just hired a new metallurgist and
    Reformulated a lot of their alloys, the ones I use got better. 

Hope I helped some...
James M...
Outcast & Company
Seattle

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