Abstract: A drill point grinding machine having a selectively positionable workhead rotatably supporting a drill to be ground and a rotary grinding wheel that is positionable toward and away from the workhead. The machine has a control for selectively moving the workhead such that a drill carried thereby undergoes a first cyclic path of engagement with the grinding wheel for grinding a first drill point form and a second cyclic path of contact with the grinding wheel when a second drill point form is to be ground. The control is further selectively operable for causing the workhead to move a drill successively through said first and second cyclic paths for grinding a third drill point form. The machine control also is adapted to automatically move the workhead in the foregoing manner, as well as automatically advancing the grinding wheel to a position in close proximity to the drill prior to the grinding operation and then automatically feeding the grinding wheel a further predetermined amount during grinding.

Abstract: An improved superfinishing stone for micro-finish machining of workpieces and a method of making same. The stone comprises a body of readily machinable metal with a cutting face in the form of an abrasive liner adhesively bonded to a contour face complementary to the contour of the workpiece. Coolant passages within the body of the stone extend through the abrasive liner and adhesive substrate and flush coolant directly between the cutting face and the workpiece.