Q$14.$ A round casting is $0\mathrm{.}3$ m in diameter and $0\mathrm{.}5$ m in length. Another casting of the

same metal is elliptical in cross section, with a major$-$to$-$minor axis ratio of $3,$ and has

the same length and cross$-$sectional area as the round casting. Both pieces are cast

under the same conditions. What is the difference in the solidification times of the two

castings?

Q$15.$ The blank for the spool shown in figure A$1-1$ is to be sand cast out of A$-319,$ an

aluminum casting alloy. Make a sketch of the wooden pattern for this part. Include all

necessary allowances for shrinkage and machining.