any thoughts on making a mold out of aluminum for a zinc projectile. 6 inch round stock for a 2.25 projectile. ??? I think it will be ok , my smith mold is aluminum and it works great.
what do you guys think??
rick bryan11434
any thoughts on making a mold out of aluminum for a zinc projectile. 6 inch round stock for a 2.25 projectile. ??? I think it will be ok , my smith mold is aluminum and it works great.
what do you guys think??
rick bryan11434
Zinc alloy casting temperature is too high to use in an aluminum mold. I've done it. After a lengthy pouring session, the part of the mold directly below the sprue starts to degrade/erode due to constant impact of the stream of hot metal. Zinc alloy needs an iron mold for durability. Lead alloys cast well at temps 100-150 degrees below zinc, and even then, the hardness of the aluminum is notably decreased while the mold is hot, according to articles I've read.
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