casting partial denture frames

Bobby Orr ceramics

Bobby Orr ceramics

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I'm ceramist at heart......however, is anyone casting partial frames with a torch ?? or, is an induction machine the only way ??

thanks, Orr4
 
pingvin

pingvin

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I never used acetylene, but oxygen and propane-butane mix (ordinary gas mix) I use for about 15 years for CoCr, so for partials and metal-ceramic bridges.
 
jimi

jimi

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i have no trouble casting chrome with oxy-acetylene. Follow a few simple tips and it is trouble free.
--Always use enough clean new alloy
--keep tip of casting torch clean by use of fine sandpaper and thin wire for cleaning orifices.
--use a clean flame which does not produce carbon into alloy, (adjust torch till small inner cone of flame is almost non-apparent)

--fatter flame is better than long and fast flame which could overheat the alloy cause uneven heating or burning.

--know the temperature of alloy from color and temperature/intensity of flame from sound
 
C

cdtwade

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Acetylene is the dirtiest gas you can use.
 
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noidea

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im having trouble getting enough heat for 3 or 4 ingot of co-cr. using oxy propane and size 15 cutting tip. thinking of buying larger cutting tip maybe size 32?
 
2000markpeters

2000markpeters

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Use programmable induction and you will never overheat your metal and lose any of its vital properties.
 
Wade Bognuda

Wade Bognuda

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I use a multi-orifice tip (11 holes) propane set at 5 lbs. and oxy set at 10 lbs. I use Harris products. Don't buy this stuff the a lab supplier, go to a welding supply house, it's pretty light so you may have to tell them your are making jewelry so they get it.
 
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rkm rdt

rkm rdt

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Just send it to Mark Peters so he can pay off his vital properties.;)
 

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