Danny, You are the perfect one to ask a question that occurred to me while reading the various responses in this thread. How many times is a sand mold used to cast a plate? Is the draft angle necessary for a clean release so as not to disturb the sand of the molding so it can be used again, or for a clean casting? ----Joel Danny Dover, RPT Dartmouth College, Hanover, NH wrote: > Patternmaking has its own set of rules, just as we have, to design > pieces that will release cleanly from the sand mold. One of those rules is, > the deeper the impression in the sand (that is, the higher the vertical wall of > the piece coming out of the sand), the more draft angle required to get a clean > release. So if the height of the flange changes, you can expect the
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