Metal casting
#1
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Location: Townsville, North Queensland.
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Metal casting
Hi Guys,
I am trying to cast some items for my 4WD, and I was wondering if anyone Knew the the limitations of using gysum plaster, to construct my moulds.
I am aware of green sand moulding etc, but the part i need to make has to be repeated a number of times, therefore I need a semi permanent mould.
The metal I am casting is Aluminimum, so it would need to withstand temps in the order of 1200 degrees.
Any ideas ??
Norm
I am trying to cast some items for my 4WD, and I was wondering if anyone Knew the the limitations of using gysum plaster, to construct my moulds.
I am aware of green sand moulding etc, but the part i need to make has to be repeated a number of times, therefore I need a semi permanent mould.
The metal I am casting is Aluminimum, so it would need to withstand temps in the order of 1200 degrees.
Any ideas ??
Norm
#2
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Location: Zig Zag, Oregon
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Norm,
I'm not sure that a permanent mold material exists. The materials that I'm familiar with break down during casting, the heat destroys it. You might be better off by making a silicone mold from a master. Subsequent pieces would be made from that silicone mold.
jerry
I'm not sure that a permanent mold material exists. The materials that I'm familiar with break down during casting, the heat destroys it. You might be better off by making a silicone mold from a master. Subsequent pieces would be made from that silicone mold.
jerry
#3
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I make a plaster cast of what I want to copy then a urethane positive and then the sand casts are made of the urethane master.
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I do something similar however I use investment rather than sand. I do lost wax casting in my jewelry biz.