2. (20 pts) The blank for the spool shown in the figure below 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 Shrinkage allowance = 10-20 mm/m, Machining allowance = 2 mm. Draft = 30) 10 mm 100 mm 25 mm diameter 15 mm 75 mm