In a dimple processing method for forming dimples on a curved surface of a workpiece, a cutting tool having a cutting edge on a rod-shaped body is rotated about a central axis of the cutting tool. The workpiece is rotated about a first axis. The cutting tool or the workpiece moves on a virtual plane through which the first axis passes or on a plane parallel to the virtual plane. The cutting tool or the workpiece moves such that the tip end of the cutting tool follows the curved surface of the workpiece. The cutting edge forms one or more dimple on the curved surface each time the cutting tool rotates.

A cutting tool includes: a main body portion composed of a cemented carbide; and a front end portion composed of a binderless cubic boron nitride polycrystal, the front end portion being joined to the main body portion. In an axial direction along a rotation axis of the main body portion, the main body portion has a first end and a second end opposite to the first end. The front end portion has a neck portion and an edge portion, the neck portion protruding from the second end along the axial direction, the edge portion being continuous to the neck portion, the edge portion being located at a location distant away from the second end relative to the neck portion in the axial direction. In the axial direction, the neck portion has a third end on the edge portion side and a fourth end opposite to the third end.

A shaped article can include a substrate formed from a glass material, a glass ceramic material, or a combination thereof and a cavity formed in the substrate. A sidewall of the cavity can have a random textured surface with a surface roughness of less than or equal to 300 nm. A method of machining a protrusion in a graphite block can include translating a cutting tool in a first longitudinal direction toward the graphite block to engage the graphite block with the cutting tool while rotating the cutting tool about a rotational axis without translating the cutting tool in a lateral direction, then translating the cutting tool in a second longitudinal direction away from the graphite block without translating the cutting tool in the lateral direction to disengage the cutting tool from the graphite block. A shaped article can be formed by pressing a preform with a monolithic graphite mold.

A plurality of dimples are formed on a processing surface of a workpiece. An aspect ratio of each dimple is greater than or equal to 5.0 and less than or equal to 50.0. The aspect ratio is a ratio of a length of the dimple measured in a longitudinal direction to a lateral width of the dimple measured in a direction perpendicular to the longitudinal direction.

An end mill includes a major-diameter shank, a cone-shaped connector portion disposed at the end of the shank, a minor-diameter body disposed by way of the connector portion coaxially therewith, a toothed element disposed at the leading end of the body, an installation recess dented slightly in the toothed element, and a cutting edge held in the installation recess so as to swell in the shape of an arc to protrude from an outer peripheral face of the body.

A method for forming dimples on a workpiece includes providing a rotary cutting tool. The rotary cutting tool includes a cutting edge that protrudes in a leading direction parallel to a longitudinal axis of the tool. The cutting edge extends from a position at the leading end of the rod-shaped main body that is radially offset from the longitudinal axis. The rotary cutting tool is set such that the longitudinal axis of the rotary cutting tool is inclined relative to a line perpendicular to the processing surface of the workpiece. The rotary cutting tool is moved along the processing surface while the rotary cutting tool is rotated about the axis. The processing surface is cut by the cutting edge to form the dimples, which are spaced apart from each other on the processing surface.

A surgical bur with a head that defined a single flute. The flute has a rake surface with a cutting edge and an opposed recess edge. The cutting edge is spaced further from axis of shaft of the bur than the recess edge. The rake surface is often, but not always, planar.

A milling tool for milling and/or drilling workpieces, which is rotatable in a direction of rotation about an axis of rotation during machining, comprising a milling head, which has a radius cutter that describes a portion in the form of a circular arc such that the milling head takes up a partially spherical, in particular a hemispherical volume, in rotation, a main body, which has a main feature in the form of a helical recess with respect to the rotation volume taken up by the rotating milling tool in order to form a conveying helix, wherein the main feature is provided with a cutting edge as main cutter, wherein the main feature has a smooth lateral surface arranged on the side facing away from the main cutter in the direction of rotation.

A milling tool has a shank and a milling portion arranged along a longitudinal axis of the milling tool. The milling portion has at least one peripheral blade and a flute that adjoins a cutting edge of the peripheral blade. A radial spacing between the cutting edge and the longitudinal axis is selected on the basis of a specified compensation rotational speed such that a shell surface formed by the rotating cutting edge is circular cylindrical in the case of a rotation of the milling tool at the compensation rotational speed. The radial spacing of the cutting edge increases continuously or decreases continuously as the distance from the shank increases.

A single-edged milling tool has a shaft section and a machining section. A face cutting edge is formed on a distal end of the machining section. The face cutting edge extends radially from an outside end at an outer peripheral edge to an inside end close to the axis of rotation. The face cutting edge has an outer peripheral planar portion at a constant planar distance to a reference plane extending perpendicular to the axis of rotation. An oblique portion connects the planar portion to the inside end. The oblique portion of the face cutting edge is closer to the reference plane than the planar portion. The distance of the face cutting edge from the reference plane in the oblique portion diminishes continuously starting out from the planar portion to the inside end of the face cutting edge.