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centrifugal castings

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Does anybody have machines to do centrifugal castings.We mfg a lot of lead lures & i was wondering why do you get holes in round jigs with soft lead?Only round jigs i think as when we cast tube jigs they do not get holes.Also it comes out nice & shinny.I know you add some antimony to get rid of the hole.

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You could be taking out of the mold too quick. Your gate could be too wide.

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