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Reposition the riser in Problem 1 so that it sits directly on top of the flat rectangle, with its bottom circular surface being part of the surface of the casting, and recompute the size and yield fraction. Which approach is more efficient?
Problem 1
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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