According to one implementation, a rotary cutting tool includes: a body without a back taper; and a cutting edge part integrated with the body. The body has a flow path of a cutting oil inside the body. The cutting edge part has a first supply port that supplies the cutting oil toward a workpiece. The body has at least one second supply port that supplies the cutting oil to a clearance formed between a bush for positioning and the body. The bush is used by being inserted in the body.

A lathe loading clamp for supporting bars includes a main body provided with a shaft for coupling to a rotating assembly, which is substantially tapered at one of its ends, and a cavity at the opposite end. The cavity accommodates, with a predefined axial play, a bush, made of material that is at least partially polymeric, which has an axial channel having a diameter that is substantially complementary to the diameter of the bar to be supported. The axial channel (6), in the configuration for use, accommodates a portion of a bar.

The flow of heat energy from the cutting edge rim of a self-propelled round annular rotary cutting element (insert) to axial-load and radial-load bearings in a cartridge which rotatably supports the insert on a machine tool body is reduced by defining heat flow paths from the insert rim to cartridge components which engages the bearings to have low thermal conductance relative to heat flow paths from the insert rim to other parts of the cartridge. Control over heat flow path thermal conductance is obtained by selection of materials used between the insert rim and the mentioned cartridge components, by reductions in the cross-sectional areas of the critical heat flow paths, and by combinations of those two techniques. Protection of the bearings from heat enables the insert and the cartridge to be reduced in size. Improved mountings of insert-supportive cartridges to tool bodies are disclosed. The insert and the cartridge preferably are shaped to enable the insert to be positioned on a tool body so that the insert's rake face can have a positive rake orientation relative to a workpiece. Arrangements for controlling cuttings chip formation and for handling cuttings chips also are disclosed.

A jig for machining firearm frames is described. The jig includes a main body, a top plate, and bushing pockets. Inserts including a rear matched-geometry insert and a front matched-geometry insert are fastened within the main body and positioned to register a location of opposing ends of a blank frame. For example, a beavertail insert shaped complementarily to a proximal end of a firearm, and a rail insert shaped complementarily to a distal end of a firearm may be used as inserts with the jig. A variety of bushing inserts can also be used with the jig to precisely register the locations for desired machining.

Disclosed is a multiple machining apparatus for, upon receiving a plastic cylindrical work piece therewithin, performing multiple machining operations thereon. The apparatus includes a rotary fixture capable of rotation; the rotary fixture includes a proximal means for snugly holding a proximal portion of the work piece, and a distal means for holding substantially the rest of the portion of the work piece. The apparatus further consists of a movable table with a blade holder for holding a plurality of blades, each of which corresponding to a machining operation, the movable table and thereby the blade holder is capable of movement along X, Y and Z axes. The apparatus performs multiple machining operations on the work piece by virtue of the rotation of the rotary fixture, rotation of the blades, and the movement of the movable table, working against the rotating work piece.

Reducer sleeves are described herein. Reducer sleeves described herein comprise a reducer sleeve body having an axial forward end and an axial rearward end. The reducer sleeve body defines a longitudinal axis. Reducer sleeves further comprise a flange disposed at the axial forward end of the reducer sleeve body. The flange defines a first nozzle disposed at a first radial distance from the longitudinal axis and a second nozzle disposed at a second distance from the longitudinal axis. The reducer sleeve body defines a first trough extending from the axial rearward end to the axial forward end. The first trough is in communication with the first nozzle and the second nozzle, whereby coolant is able to enter the first trough and flow along the first trough and into the first nozzle and the second nozzle such that the coolant is ejected by the first nozzle and the second nozzle.

According to one implementation, a drill includes: a drill includes: a body without a back taper; and a cutting edge part integrated with the body. The body has a flow path of a cutting oil inside. The cuffing edge part has a first supply port that supplies the cutting oil toward a workpiece, The body has at least one second supply port that supplies the cutting oil to a clearance formed between a bush for positioning and the body. The bush is used by being inserted in the body.

A reducer sleeve includes a reducer sleeve body that has an axial forward end and an axial rearward end, as well as a flange at the axial forward end thereof. The flange contains a first nozzle. The reducer sleeve body contains a first trough extending from the axial rearward end to the axial forward end. The first trough is in communication with the first nozzle whereby coolant is able to enter the first trough and flow along the first trough and into the first nozzle wherein the coolant is ejected by the first nozzle.

A tool holder with a main part, a deformable receiving portion for clamping a tool, and at least one blocking element which is designed to engage into a corresponding counter element on the tool in order to prevent the tool from moving axially out of the tool holder. The at least one blocking element is integrally formed with the receiving portion. A clamping system having such a tool holder and a method for producing a receiving portion for such a tool holder are also described.

A counter bearing for machining spindles of machine tools has at least one expansion bushing with an elastically deformable wall that delimits at least one pressure chamber. The pressure chamber accommodates a pressure medium. A supply line for the pressure medium opens into the pressure chamber. A pressure conduit opens into the pressure chamber. A mechanically actuatable pressure element is disposed in the pressure conduit and actuated by an actuating tool. A piston is slidably arranged in the pressure conduit and actuated by the pressure element, wherein the piston loads the pressure medium.