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 tapered end mill includes an outer circumferential cutting edge, a flute is disposed such that a flute bottom radius defined as a distance between a flute bottom and the tool axis decreases from a shank side toward the tool tip side, the flute bottom radius linearly changes at a predetermined gradient angle in the tool axis direction, the gradient angle changes at a predetermined change point to become smaller on the tool tip side as compared to the shank side, and a gradient angle θ1 on the tool tip side relative to the change point is equal to or larger than 0° and smaller than a taper half angle α of a cutting portion provided with the outer circumferential cutting edge, and a gradient angle θ2 on the shank side relative to the change point is larger than the taper half angle α.

A tapered end mill includes an outer circumferential cutting edge, a flute is disposed such that a flute bottom radius defined as a distance between a flute bottom and the tool axis decreases from a shank side toward the tool tip side, the flute bottom radius linearly changes at a predetermined gradient angle in the tool axis direction, the gradient angle changes at a predetermined change point to become smaller on the tool tip side as compared to the shank side, and a gradient angle θ1 on the tool tip side relative to the change point is equal to or larger than 0° and smaller than a taper half angle α of a cutting portion provided with the outer circumferential cutting edge, and a gradient angle θ2 on the shank side relative to the change point is larger than the taper half angle α.

A machining device includes: a positional deviation detection unit configured to calculate a correction value for correcting a positional deviation between an ideal contour line and an actual contour line in each of a plurality of angular directions based on a center of a hemispherical shape of a tool; a distance effect coefficient calculation unit configured to calculate a first distance effect coefficient indicating a degree of influence of the positional deviation when machining a second machining point, according to a distance between the tool and the second machining point in a case where a machining point machined by the tool transitions from one-point machining including a first machining point in the workpiece to two-point machining including the first machining point and the second machining point; and a positional deviation correction unit configured to correct the positional deviation of the tool.

Improvements in a self-balancing tool holder or material removal machine that allows for greater accuracy of material removal. The balancer is able to self-adjust, any changes in the assembly are automatically adjusted. The adjustment can account for tool wear, accumulation of debris on the tool and balancing at different speeds of rotation. The tool holder balancer can be a mechanical fastener, shrink fit or bonding to the tool holder or material removal machine. The balancer uses a plurality of balls or any form of movable weight in the ring to provide the balance. The plurality of balls or media can freely move around the inside of the ring to offset any imbalance. The balls roll or spin to unique positions to provide a dynamic balance. The number and size of balls or weighted media is selected based upon the maximum amount of dynamic balancing that is required.

Improvements in tooling for machining systems that utilize machining fluids comprising a supercritical fluid are disclosed. In some embodiments a tool may include a plurality of orifices configured to direct a supercritical machining fluid towards a cutting interface of the tool. In other embodiments, a tool holder may include one or more outlets configured to direct a supercritical machining fluid towards a cutting interface. Moreover, some embodiments, may relate to machining systems including one or more venting channels configured to provide pressure relief for a cavity located behind a tool holder. Embodiments related to machine tools including upstream fluid restrictions for controlling a flow of supercritical machining fluid through a tool are also disclosed.

Improvements in tooling for machining systems that utilize machining fluids comprising a supercritical fluid are disclosed. In some embodiments a tool may include a plurality of orifices configured to direct a supercritical machining fluid towards a cutting interface of the tool. In other embodiments, a tool holder may include one or more outlets configured to direct a supercritical machining fluid towards a cutting interface. Moreover, some embodiments, may relate to machining systems including one or more venting channels configured to provide pressure relief for a cavity located behind a tool holder. Embodiments related to machine tools including upstream fluid restrictions for controlling a flow of supercritical machining fluid through a tool are also disclosed.

A rotary tool may include a main body having a circular columnar body, including a rotation axis and extending from a first end to a second end. The main body may include first flutes, second flutes, a first cutting edge, and a second cutting edge. The first flutes may have a helix angle θ1 and the second flutes a reverse helix angle θ2. The first cutting edge may be located on a ridge line where the outer periphery of the main body intersects with the first flutes and the second cutting edge at a ridge line where the outer periphery of the main body intersects with the second flutes. The θ2 may be larger than the θ1, m≥5, m−n≥3, and m and n are coprime numbers, where m is the number of the first flutes and n is the number of the second flutes.

A rotary tool may include a main body having a circular columnar body, including a rotation axis and extending from a first end to a second end. The main body may include first flutes, second flutes, a first cutting edge, and a second cutting edge. The first flutes may have a helix angle θ1 and the second flutes a reverse helix angle θ2. The first cutting edge may be located on a ridge line where the outer periphery of the main body intersects with the first flutes and the second cutting edge at a ridge line where the outer periphery of the main body intersects with the second flutes. The θ2 may be larger than the θ1, m≥5, m−n≥3, and m and n are coprime numbers, where m is the number of the first flutes and n is the number of the second flutes.

Various components of an electronic device housing and methods for their assembly are disclosed. The housing can be formed by assembling and connecting two or more different sections together. The sections of the housing may be coupled together using one or more coupling members. The coupling members may be formed using a two-shot molding process in which the first shot forms a structural portion of the coupling members, and the second shot forms cosmetic portions of the coupling members.