Abstract: Machine for grinding hard workpieces, with an arm equipped at one end with a grinding tool, a machine base supporting a table on which the workpiece is mounted, and an arrangement for supplying cutting liquid, which comprises in combination:an arm pivoted to swing up and down in a vertical plane which is fixed in position relative to the support,means for raising and lowering the arm,a table supported on hydraulic floatation feet to which a stream of cutting liquid is supplied,a machine base on which the table is mounted to be mobile thereon,means for moving the table in two directions on the machine base.

Abstract: A mold for molding melted refractory products, which comprises, on the internal surface of its side walls, thin surface discontinuities for holding the solidified crusts which are formed against said side walls, above the level of the melted product, on filling the mold, due to the splashing of some of the melted product. Preferably the side walls of the mold are metallic and cooled by a circulating liquid. The mold of the invention permits to make molded products which are free from the defects called "casting side voids".