A reusing method of an end mill involves machining a base material of an end mill in advance so as to have coaxiality equal accuracy to coaxiality for a cutting part, and when the cutting part is worn out, cutting off of the cutting part and machining a new cutting part on a shank part while a part of outer peripheral surface of the shank part is left as margin without cutting. The new cutting part has accuracy of coaxiality and an outer diameter identical to those of the cutting part.

A reusing method of an end mill involves machining a base material of an end mill in advance so as to have coaxiality equal accuracy to coaxiality for a cutting part, and when the cutting part is worn out, cutting off of the cutting part and machining a new cutting part on a shank part while a part of outer peripheral surface of the shank part is left as margin without cutting. The new cutting part has accuracy of coaxiality and an outer diameter identical to those of the cutting part.

The embodiments relate to a method for designing a part manufacturable by milling operations. The method comprises providing a topologically optimized 3D modeled part, computing a bounding volume encompassing the topologically optimized 3D modeled part, defining a milling direction of a milling tool, computing a silhouette of the topologically optimized 3D modeled part according to the milling direction, the silhouette comprising a contour, and computing a new contour based on a parameter of the milling tool.

The embodiments relate to a method for designing a part manufacturable by milling operations. The method comprises providing a topologically optimized 3D modeled part, computing a bounding volume encompassing the topologically optimized 3D modeled part, defining a milling direction of a milling tool, computing a silhouette of the topologically optimized 3D modeled part according to the milling direction, the silhouette comprising a contour, and computing a new contour based on a parameter of the milling tool.

A reusing method of an end mill 1, in which an end mill (1) has a margin which is a part of a circle having a diameter identical to a diameter of a shank part (3), the margin being provided on an outer edge of a cutting part (2), a base material of the end mill (1) is machined in advance so as to have coaxiality having equal accuracy to coaxiality for the cutting part (2), the shank part (3) is an unmachined part left without cutting the base material, the margin is a part of an outer peripheral surface of the base material left without cutting the base material when the outer edge is formed by cutting the base material, and when the cutting part (2) is worn out, the cutting part (2) is cut off and a new cutting part 2 is machined on the shank part (3) while a part of outer peripheral surface of the shank part is left as the margin without cutting, the new cutting part 2 having accuracy of coaxiality and an outer diameter identical to those of the cutting part (2).

An apparatus for metal-cutting machining of wear-affected bit-head-proximal end regions of bit holders of road milling machines encompasses: a rotary actuator having an output member rotating around an actuator rotation axis; at least one material-removing tool, rotatable around a tool rotation axis, which is coupled or couplable to the output member so as to rotate together; a positioning arbor, extending along an arbor axis, which is embodied for introduction into a bit receptacle opening of a bit holder and which comprises an abutment segment, located radially remotely from the arbor axis and facing away from the arbor axis in a direction having a radial component, which is embodied for abutment against an inner wall of the bit receptacle opening.

A material-removing region, populated with cutting edges, of the material-removing tool is arranged between the positioning arbor and the output member.

An apparatus for metal-cutting machining of wear-affected bit-head-proximal end regions of bit holders of road milling machines encompasses: a rotary actuator having an output member rotating around an actuator rotation axis; at least one material-removing tool, rotatable around a tool rotation axis, which is coupled or couplable to the output member so as to rotate together; a positioning arbor, extending along an arbor axis, which is embodied for introduction into a bit receptacle opening of a bit holder and which comprises an abutment segment, located radially remotely from the arbor axis and facing away from the arbor axis in a direction having a radial component, which is embodied for abutment against an inner wall of the bit receptacle opening.

A material-removing region, populated with cutting edges, of the material-removing tool is arranged between the positioning arbor and the output member.

A method for manufacturing a sidewall support surface of an insert-receiving pocket with a compound radius includes the steps of: 1) tilting a cutting tool at a primary tilt angle with respect to a first plane (x-z); 2) tilting the cutting tool at a secondary tilt angle with respect to a second plane (y-z), the second plane different than the first plane; and 3) rotating the cutting tool about an axis (z-axis) perpendicular to a pocket floor of the insert-receiving pocket while maintaining the first and second tilt angles. A cutting tool including a toolholder with the insert-receiving pocket having a pocket floor and the sidewall support surface formed with a compound radius is also described.

A method for manufacturing a sidewall support surface of an insert-receiving pocket with a compound radius includes the steps of: 1) tilting a cutting tool at a primary tilt angle with respect to a first plane (x-z); 2) tilting the cutting tool at a secondary tilt angle with respect to a second plane (y-z), the second plane different than the first plane; and 3) rotating the cutting tool about an axis (z-axis) perpendicular to a pocket floor of the insert-receiving pocket while maintaining the first and second tilt angles. A cutting tool including a toolholder with the insert-receiving pocket having a pocket floor and the sidewall support surface formed with a compound radius is also described.