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Old October 9, 2012, 08:51 AM   #4
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Join Date: October 28, 2006
Location: South Central Michigan...near Ohio, Indiana.
Posts: 5,024
It is not rocket science. If a mold is not closing all the way, something is keeping it from closing. Open the sprue plate and hold the mold up to the light to see if light is shining through where the halves meet. After a careful examination you have not found what it holding the mold open, you should go to your eye doctor. In short, examine the mold carefully, something is holding it open, be it a speck of lead or a burr on the Aluminum itself, or lead has entered, filled the steel pin alignment hole(s). There is a small number of things that can keep a mold from closing all the way. If you look, you will find it.

If you cannot find anything that is holding the blocks apart, it is usually some lead that has gotten into the hole for the alignment pins...a frequent occurrence if a person preheats their mold on top of a casting furnace and the mold slips into the pot.

Last edited by dahermit; October 9, 2012 at 12:16 PM.
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