Thick section casting (CNC Router Drop Plate)

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Harry
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Re: Thick section casting (CNC Router Drop Plate)

Post by Harry »

Hi David, yes I used a longer flask so I could feed from each end. At the pouring end I had the sprue feed a bob (blind riser) and at the far end added a second bob. I am still getting a very small depression of less than a couple hundredths but this is well within the waste material that is milled off the part.

I think a lot of the more drastic deformation was mold collapse rather than shrink though. The pattern took up so much of the flask that there was not a lot to support the sand in the cope left and once weighted it simply settled. Using the block molding they way I do the pressure from the mold weights is directed through the sand rather than supported by the flask itself.
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