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Old December 4, 2009, 01:51 AM   #2
snuffy
Senior Member
 
Join Date: May 20, 2001
Location: Oshkosh wi.
Posts: 2,797
Dave, I suspect the vent lines are not deep enough. Sounds like a little work deepening them would give you better fill-out. it's not rally hard to do, but you have to be careful NOT to raise any burrs on the edges of the cavity. An engraving tool is best for this, but any steel with an edge that can be pushed or drawn along the vent lines will work.

Another thing is sometimes the sprue plate is too tight to the top of the mold, it has to have a tiny bit of a gap to vent the top of the mold also.
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