A rotary cutting tool is provided that includes a shank and a body. The body extends axially outwardly from the shank, and has a plurality of first teeth and a plurality of second teeth. The first and second teeth are alternately arranged and spaced apart from one another around a circumference. Each first tooth includes a primary cutting edge disposed at a primary angle relative to the rotational axis and a tertiary cutting edge disposed at a tertiary angle relative to the rotational axis. Each second tooth includes a secondary cutting edge disposed at a secondary angle relative to the rotational axis. The secondary cutting edge is disposed axially between the primary cutting edge and the tertiary cutting edge.

A rotary cutting tool is provided that includes a shank and a body. The body extends axially outwardly from the shank, and has a plurality of first teeth and a plurality of second teeth. The first and second teeth are alternately arranged and spaced apart from one another around a circumference. Each first tooth includes a primary cutting edge disposed at a primary angle relative to the rotational axis and a tertiary cutting edge disposed at a tertiary angle relative to the rotational axis. Each second tooth includes a secondary cutting edge disposed at a secondary angle relative to the rotational axis. The secondary cutting edge is disposed axially between the primary cutting edge and the tertiary cutting edge.

Provided is a taper reamer with which it is possible to achieve an improvement in machining accuracy and machining life. The taper reamer comprises a plurality of cutting edges each having a helical shape provided on the outer periphery of a cutting-edge portion having an external diameter being expanded from a front end toward a rear end thereof, wherein an intertooth angle, defined between each of a pair of the cutting edges adjacently arranged in a circumferential direction, is different from one another at any given reference position, and wherein the plurality of cutting edges each have a helix angle that is different from one another. As the plurality of cutting edges that are unequally partitioned each have the helix angle that is different from one another, a resonance during cutting can be prevented.

Provided is a taper reamer with which it is possible to achieve an improvement in machining accuracy and machining life. The taper reamer comprises a plurality of cutting edges each having a helical shape provided on the outer periphery of a cutting-edge portion having an external diameter being expanded from a front end toward a rear end thereof, wherein an intertooth angle, defined between each of a pair of the cutting edges adjacently arranged in a circumferential direction, is different from one another at any given reference position, and wherein the plurality of cutting edges each have a helix angle that is different from one another. As the plurality of cutting edges that are unequally partitioned each have the helix angle that is different from one another, a resonance during cutting can be prevented.

A method for enlarging each one of an initial pair of holes, which includes a first hole, extending through a first component, and a second hole, extending through a second component, includes inserting a pilot member, corresponding to a tolerance of misalignment of the first hole and the second hole of the initial pair of holes, such that pilot member passes through a clearance gap, defined by at least a portion of a boundary of first hole and at least a portion of a boundary of second hole with pilot member having a first central axis. The method also includes cutting a second pair of aligned holes through first and second components, respectively, with a cutter section, which has a second central axis.

The invention relates to a tool for forming a drilled hole (B), comprising a shank that is rotatable or rotates about a tool axis (A), at least one first portion, which is rotatable or rotates about the tool axis (A), for producing and/or widening a drilled hole (B) by chip cutting, and a second portion, which rotates about the tool axis (A), for widening a drilled hole (B) without chip cutting, wherein the second portion is arranged behind the first portion in a direction of advance (V) of the tool. The invention additionally relates to a method for producing a drilled hole (B).

Provided is a taper reamer with which it is possible to achieve an improvement in machining accuracy and machining life. The taper reamer comprises a plurality of cutting edges each having a helical shape provided on the outer periphery of a cutting-edge portion having an external diameter being expanded from a front end toward a rear end thereof, wherein an intertooth angle, defined between each of a pair of the cutting edges adjacently arranged in a circumferential direction, is different from one another at any given reference position, and wherein the plurality of cutting edges each have a helix angle that is different from one another. As the plurality of cutting edges that are unequally partitioned each have the helix angle that is different from one another, a resonance during cutting can be prevented.

Provided is a taper reamer with which it is possible to achieve an improvement in machining accuracy and machining life. The taper reamer comprises a plurality of cutting edges each having a helical shape provided on the outer periphery of a cutting-edge portion having an external diameter being expanded from a front end toward a rear end thereof, wherein an intertooth angle, defined between each of a pair of the cutting edges adjacently arranged in a circumferential direction, is different from one another at any given reference position, and wherein the plurality of cutting edges each have a helix angle that is different from one another. As the plurality of cutting edges that are unequally partitioned each have the helix angle that is different from one another, a resonance during cutting can be prevented.

A cutter assembly for increasing a diameter of an initial pair of holes that includes a first hole defined through a first component and a second hole defined through a second component. The cutter assembly includes a pilot member having a pilot diameter corresponding to a tolerance of misalignment of the first hole and the second hole. Further included is a cutter section associated with the pilot member wherein the cutter section has a cutting diameter larger than the pilot diameter and the cutter section is configured to produce a second pair of aligned holes in the first and second components having a diameter dimension of that of the cutting diameter.

A cutter assembly for increasing a diameter of an initial pair of holes that includes a first hole defined through a first component and a second hole defined through a second component. The cutter assembly includes a pilot member having a pilot diameter corresponding to a tolerance of misalignment of the first hole and the second hole. Further included is a cutter section associated with the pilot member wherein the cutter section has a cutting diameter larger than the pilot diameter and the cutter section is configured to produce a second pair of aligned holes in the first and second components having a diameter dimension of that of the cutting diameter.