Abstract: A tool sharpener especially designed for sharpening drill bits is provided. The tool sharpener includes a grinding wheel subassembly, a tool holder subassembly, such as a drill chuck, an infeed stage subassembly, a cross feed stage subassembly, and a processor which is capable of controlling each of the subassemblies, and moving the subassemblies relative to the grinding wheel, in preprogrammed routines, to effect the sharpening of a tool such as a drill bit.

Abstract: A precision drill sharpener and grinding wheel assembly is provided, as is a corresponding drill chuck for use with the drill sharpener, in which the drill sharpener includes a lever and spring clip alignment subassembly for properly positioning a drill in the drill chuck, and sharpening ports for sharpening the drill and splitting the drill tip, the sharpening ports being positioned such that a single grinding wheel assembly is used to both sharpen the drill and split the tip. The drill sharpener uses a small diameter grinding wheel operated at high speed to provide cutting rates comparable to large industrial sharpeners. The drill chuck is of short length, relative to most of the drills to be sharpened, and is open at the back end, enabling the manipulation of the drill by its shank relative to the drill chuck when disposed in the alignment subassembly.

Abstract: A twist drill sharpener employing a pair of rotary grinding wheels has three primary drill chuck receiving openings, one for alignment of the twist drill and cams on the twist drill chuck; a second receptacle for grinding the end of a chucked twist drill; and a third receptacle which receives the drill and chuck for grinding a split point on the sharpened twist drill.

Abstract: An end mill resharpening device is provided which will resharpen the primary and secondary cutting edges of both the flutes and the end of the mill. All of the proper side and end angles, as well as an end "fish-tail" angle are produced automatically by the unique features of the device. Additional benefits provided include a novel method of making an air bearing, a floating spindle knob and grinding wheel balancer.

Abstract: A substantially universal power feed for a drilling machine has a unique clutching arrangement whereby overloads are substantially eliminated. A further safety feature comprises a shear plate which functions to stop rotation of the power feed in the event of clutch malfunction or over adjustment of the clutch release spring. The power feed is also of the type that the feeders arbor may be rotated with the clutch disengaged from the motor so that the operator has a choice of using the power feed or manually feeding the drill without the necessity of physically removing the power feed from the drilling machine.

Abstract: A fluted twist drill point splitting/web thinning apparatus is disclosed which permits simple point splitting/web thinning of conventional sharpened twist drills. The apparatus is uniquely designed such that either of the two operations, that is point splitting or web thinning, can be simply and accurately carried out with the same assembly. The apparatus also includes the provisions of a grinding wheel dressing diamond mounted on a forward face of the apparatus.

Abstract: A relatively low cost twist drill sharpener apparatus employable with a rotary grinding wheel has a twist drill alignment fixture which positions the drill with respect to the drill holding chuck. The twist drill holding chuck has mounted thereto one or a pair of cam elements which cooperate with a sharpener fixture which is adjustable for height, pivotal motion and backward and forward motion relative to the rotary grinding wheel. The fixture has mounted thereto a second cam and is adapted to receive the twist drill chuck and control the grinding of the twist drill when the chuck is pressed toward the face of the grinding wheel and rotated clockwise. The fixture and the chuck are also adapted to receive a wheel dressing element.

Abstract: A drill holding chuck is provided having particular utility for use with a drill sharpening tool. The chuck includes an outer tubular housing having cylindrical ends rotably receivable in bearing members to provide spaced support for the chuck and the jaw closing force is applied to the chuck jaws about midway of their length.

Abstract: A twist drill sharpener employing a rotary grinding wheel has a twist drill chuck which mounts a pair of cams which are locked to the chuck when the lips of the twist drill are aligned in an aligning fixture and then the chuck, cams and drill are inserted in a second fixture provided with a pair of cam followers which in conjunction with the chuck carried cams control the grinding of the twist drill.