Patent ID: 8186417

Claim:
A method for casting metal comprising: providing an elongated sand mold cavity having an orifice through which molten metal may be introduced; disposing said mold on a rotatable structure having a rotational axis that defines a plane of rotation, and such that the center of the mold cavity is spaced apart from the rotational axis; pouring molten metal into said orifice at a rate that ensures the entire cavity is filled before the metal starts to solidify while at the same time causing said turntable to increase in rotational state, thereby producing a centrifugal force tending to cause the molten metal to flow in a radially outward direction with respect to the rotational axis of the turntable such that the upper surface of the molten metal under the combined influence of centrifugal force and gravity defines an angle with respect to the plane of rotation; varying the rotation velocity of the turntable during the pouring of molten liquid metal into said orifice to maintain the molten metal introduced into said mold cavity under a substantially constant centrifugal force as molten metal is added so that the centrifugal force causes an angle of a poured liquid metal surface to equal or exceed an angle of a vertical-most interior surface encountered as the poured liquid metal level rises, wherein the vertical-most interior surface is located farthest from said orifice and is substantially perpendicular to a bottom surface of said mold cavity; and continuing to rotate said turntable until the molten metal in said cavity solidifies.