Abstract: A drill has a shank with a central axis of rotation and at least one insert on one end of the shank. The insert has at least two cutting edges. The first cutting edge has a negative radial rake and the second cutting edge has negative axial and positive radial rake surface. The first and second cutting edges cooperate to form a radiused hole when rotated about the central axis. Also, the cutting insert is composed of hard wear resistant material. The insert has top and bottom faces and a peripheral wall joining the top and bottom faces. The insert body is polygonal when viewed in plan. One of the top and bottom faces acts as a seating face and the other acts as a cutting face. There are first cutting edges formed on opposite sides of the cutting face at the juncture of the cutting face with the peripheral wall. One end of each of the first cutting edges terminates in a juncture with a second cutting edge that extends from the cutting face toward the seating face.

Abstract: An arrangement and method for mounting a cutter body, especially a milling cutter, in which the cutter and power driven spindle have a common axis of rotation. An arbor shank is used to interconnect the cutter with the spindle with one end of the shank mating with a shouldered bore formed in one of the spindle and cutter. Radially moveable clamp elements are provided to expand and engage the shoulder so as to urge one face of the cutter body into firm abutment with one end of the spindle. Keying means are also provided between the cutter body and the power driven spindle.

Abstract: An improved tool holder of the type having an insert receiving pocket and using tiltable pin to clamp an insert in the pocket. The pin is located in a bore through the bottom of the pocket of the tool holder and is tiltable therein so that one end of the pin engages a center hole of an insert and clamps it in the pocket. A recess communicates with the bore near the lower end of the pin when the pin is in the bore and spherical elements such as balls are disposed in said recess. Means for moving said spherical elements are provided so that the pin is tilted into clamping position on the insert. A top clamp is provided that cooperates with the pin element in clamping said insert.

Abstract: A cutting insert, especially for milling cutters and the like, and which is to be mounted in a tool holder in a negative radial rake position. The insert is indexable and invertable and has a cutting edge means. The peripheral wall adjacent the cutting edge means has recesses therein which interrupt the cutting edge means. The depth of the recesses becomes shallower as the recesses extend away from the cutting edge means until the recess terminates in the peripheral wall. An insert having at least two cutting edges is described wherein the insert has at least two cutting edges and the recesses interrupting one cutting edge are staggered relative to the recesses interrupting the other cutting edge when the cutting edges are viewed in superposed relation.

Abstract: A tool holder in which the holder comprises a support member with a block detachably mounted in a notch on one end of the support member and with the block having insert receiving pockets for mounting cutting inserts therein. Cooperating ribs and grooves locate the block on the support member and a clamp member carried by the support member extends upwardly through a slotted portion in the block and has a head for clampingly engaging said block.

Abstract: A tool holder for clamping an insert in an insert receiving pocket of the tool holder wherein the pocket has at least a bottom wall and a side wall for engaging the sides of a cutting insert. A pin member with a head on one end for engaging the top of the insert is inserted through an aperture in the insert and the other or opposite end of the pin engages a hole formed in one of the bottom and side walls of the pocket. Threaded cooperating elements of cam means formed on the other end of the pin and in the hole in one rotated position engage and clamp the insert in the pocket and axial recesses in the threads of each are adapted to receive the threads of the other so as to allow free axial travel of the pin when it is in another rotated position.

Abstract: A cutting insert, especially for milling cutters or the like, which is receivable in a holder and which insert has linear edge portions which meet at the corners of the insert. The insert is indexable in the holder to present a selected edge to work to be done. Each of the edges of the inserts are serrated or notched with respective edges embodying different numbers of serrations or notches so that the inserts can be arranged in the holder to cut completely across a surface with each insert taking only a portion of the surface.

Abstract: A clamping device for disposition in a blind hole or slot of a support body for locating and securing members such as hardened metal cutting inserts and the like. The clamping device of the present invention has an expandable plug member loosely receivable in a blind hole or slot and a rotatable member disposed centrally in the plug member such that upon rotation the plug member expands in the blind hole or slot to firmly clamp an insert between a wall of the blind hole and the expandable plug.

Abstract: A slotting cutter in which a disc is provided with insert pockets on opposite sides thereof with replaceable cutting inserts of hard wear resistant material mounted in the pockets. The inserts are clamped in the pockets by a wedge which forces the inserts against the rearward and bottom walls of the pockets thereby providing extremely firm support for the inserts. When the disc is viewed in the circumferential direction, the inserts are in overlapping relation and thereby cooperate to cut slots in a work member.

Abstract: A cutting insert, especially for milling cutters and the like, and which is to be mounted in a tool holder in a negative radial rake position. The insert is indexable and invertable and has a cutting edge means. The peripheral wall adjacent the cutting edge means has recesses therein which interrupt the cutting edge means. The depth of the recesses becomes shallower as the recesses extend away from the cutting edge means until the recess terminates in the peripheral wall. An insert having at least two cutting edges is described wherein the insert has at least two cutting edges and the recesses interrupting one cutting edge are staggered relative to the recesses interrupting the other cutting edge when the cutting edges are viewed in superposed relation.