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Using rule as presented in the text with n ¼ 2, calculate the dimensions of an effective riser for a casting that is a 2 in. x 4 in. x 6 in. rectangular plate. Assume that the casting and riser are not connected, except through a gate and runner, and that the riser is a cylinder of height/ diameter ratio H/D ¼ 1.5. The finished casting is what fraction of the combined weight of the riser and casting?
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