Two halves of a mold (cope and drag) are weighted down to keep them from separating due to the pressure exerted by the molten metal (buoyancy). Consider a solid, spherical steel casting, 9 in. in diameter that is being produced by sand casting. Each flask (see Fig. 5.10) is 20 in. by 20 in. and 15 in. deep. The parting line is at the middle of the part. Estimate the clamping force required. Assume that the molten metal has a density of 500 lb/ft3 and that the sand has a density of 100 lb/ft3.