drill grinding

(See compound.) Drill - grinding machine: An emery-wheel and a clamp consisting of a stationary part and a movable part by which the drill is held near the point, while the shank is supported by the rod and extensible socket. The machine is arranged to grind twist and fly drills, making cutting edges of uniform angle and length, thus insuring equality of cut upon both sides. drill-harrow, s . A harrow the teeth of which are adapted to traverse in the balks between the rows of plants in drills. drill-holder, s. A stock for holding a drill. [CHUCK.]