Abstract: A drill grinding machine employs independent servo motors for drill rotation, drill lift, and drill feed. The three motors are connected through respective suitable drive mechanisms to a tubular spindle that is rotatably mounted within a work head. The work head contains a hydraulic clamp for selectively chucking and releasing a drill holder. A drill is gripped in the drill holder such that the drill point is proximate a grinding wheel. The drill, lift, and feed motors are actuated to rotate the drill about its longitudinal axis and to move the drill point along a predetermined cyclical path of contact with the grinding wheel to grind a selected point. Combinations of points may be ground on a single drill by suitably controlling the lift and feed motors. A timing pad adjustably mounted to the machine housing cooperates with the lift and feed motors and the work head clamp to enable the drill to be manually timed prior to a grinding cycle.

Abstract: A drill grinding machine employs independent servo motors for drill rotation, drill lift, and drill feed. The three motors are connected through respective suitable drive mechanisms to a tubular spindle that is rotatably mounted within a work head. The work head contains a hydraulic clamp for selectively chucking and releasing a drill holder. A drill is gripped in the drill holder such that the drill point is proximate a grinding wheel. The drill, lift, and feed motors are actuated to rotate the drill about its longitudinal axis and to move the drill point along a predetermined cyclical path of contact with the grinding wheel to grind a selected point. Combinations of points may be ground on a single drill by suitably controlling the lift and feed motors. A timing pad adjustably mounted to the machine housing cooperates with the lift and feed motors and the work head clamp to enable the drill to be manually timed prior to a grinding cycle.