A processing apparatus for processing a workpiece includes a tool holding part 9 for holding a tool 3 for processing a workpiece 5, a transferring part 11 for transferring the tool 3 for processing the workpiece 5 with the tool 3, and a control unit 13 for controlling the transferring part 11 so as to transfer the tool 3 with respect to the workpiece 5 on the basis of an NC program, and in the NC program, an arithmetic expression for calculating the position of the tool 3 is incorporated and the program is corrected on the basis of the relationship between the cutting transferring distance, the wear amount, and the deflection amount in addition to the contour error of the tool 3.

A method for manufacturing a dental or medical tool the method comprising the steps of positioning a pre-fluted blank 14 including a stem 24 and a shank 22 within a machine 30, using a probe to identify a position and/or an orientation of at least one flute 26 of the pre-fluted blank 14 and/or the position and/or orientation of an orientation indicator 28 of the pre-fluted blank 14, and using the machine 30 to form a cutting end region 36 at the end of the stem 24 of the pre-fluted blank 14 remote from the shank 22, the flute 26 extending into the cutting end region 36, the machine 30 being controlled to ensure that the cutting end region 36 is correctly orientated relative to the flutes 26 of the pre-fluted blank 14.

In a method of setting heat-resistant alloy cutting conditions used to set cutting conditions under which a heat-resistant alloy is cut with a cutting tool, the cutting tool has a long shaft mounted on a spindle and extended in the axial direction and teeth formed on the shaft. The cutting conditions include a radial direction cutting amount of the cutting tool in the radial direction. When the radial direction cutting amount in which one tooth is constantly in contact with the heat-resistant alloy is given as a smallest radial direction cutting amount and the radial direction cutting amount in which three or more teeth are not in contact with the heat-resistant alloy is given as a largest radial direction cutting amount, a radial direction cutting amount of the cutting tool is set in the range from the smallest radial direction cutting amount to the largest radial direction cutting amount.

The invention provides a dental milling tool for milling dental materials in the making of dental prostheses. The dental milling tool is a ball-nose end mill having three helical flutes, each flute being associated with a cutting edge, each cutting edge having chip breakers along the curved edges of the ball. The dental milling tool may be formed from a hard material such as carbide based material, ceramic, cermet, superhard materials including polycrystalline diamond (PCD) and cubic boron nitride (CBN), and diamond composite. Alternatively, the dental milling tool may be coated with a hard coating such as diamond coating, diamond-like-carbon (DLC), nitride based coating such as titanium aluminium nitride (TiAlN), aluminium titanium nitride, (AlTiN), and titanium nitride (TiN), and ceramic coating.

Provided is a method of manufacturing an elbow, including: a first cutting step of cutting a material by relatively moving a cutting section of a cutting tool, which is formed of at least a part of a substantially spherical shape, along an inner side surface of the elbow to be finished in a direction from a first end surface to a second end surface of the material; and a second cutting step of cutting the material by relatively moving the cutting section along the inner side surface of the elbow to be finished in a direction from the second end surface to the first end surface of the material.

An end mill that facilitates discharge of chips and enables twining of chips to be suppressed is provided. An end mill (10) includes a tool body, a helical flute, an end cutting edge, a flank, and a gash. The gash forms a cutting face of the end cutting edge. The cutting face is formed as a recessed curved surface and the end cutting edge comprised of a ridge between the cutting face and the flank is concavely curved.

The present invention provides an end mill including: a shaft-shaped end mill main body; a chip discharge groove extending from a leading end to a trailing end in an axial direction of the end mill main body; a bottom blade which is provided at a leading end portion in the axial direction of the end mill main body and has a spherical shape in which a rotation locus around the axis has a center on the axis; and an outer peripheral blade which is provided along the chip discharge groove, and in which a rotation locus around the axis is convex outward. A curvature radius of the rotation locus of the outer peripheral blade is larger than a curvature radius of the rotation locus of the bottom blade. A twist angle of the outer peripheral blade is 20 or more.

A surgical bur including flutes and lands. Each of the flutes includes a cutting edge, rake surfaces and a clearance surface. The rake surfaces of one of the flutes are decoupled from each other. Each of the lands is disposed between a pair of the flutes.

In the ball end mill, at least two end cutting edges are extended to the vicinity of an axis at a tip portion of an end mill main body which rotates around the axis. In two gashes in which two end cutting edges adjacent to each other in a circumferential direction are formed, a first gash on the end mill rotation direction side extends beyond the axis on the tip of the end mill main body and a second gash on the rear side in the end mill rotation direction does not exceed the axis. A first tip flank face which intersects with the first gash through a first end cutting edge is extended toward a second tip flank face which intersects with the second gash through a second end cutting edge.

A rotatable cutting tool includes an elongate body and at least one helical flute extending over a length of the elongate body, the helical flute having a first end and a second end. The flute includes a cutting-edge with a first radius from a longitudinal center of the cutting tool, a trailing edge with a second radius from a longitudinal center of the cutting tool, wherein the second radius is smaller than the first radius, a flute surface between the cutting-edge and the trailing edge, the flute surface including a maximum radius at the cutting-edge and a plurality of foam chip shedding exclusions spaced along the cutting-edge of the helical flute, each of the foam chip shedding exclusions providing a gap in the cutting-edge where the radius within the gap is smaller than the first radius. The first radius defines a maximum tool cutting radius for the cutting tool. A gap distance between the foam chip shedding exclusions and the maximum tool cutting radius equals at least 15% of a radial height of the flute.