In this cutting insert, two cutting edges respectively including arc-shaped cutting edge parts extending in an arc shape in a plan view and linear cutting edge parts are provided in an intersection ridge line part between a rake face and a flank face. The cutting edges include a convex curved part moving away from a seating face and then moving close to the seating face as at least the arc-shaped cutting edge part moves away from the linear cutting edge parts. In a side view, the arc-shaped cutting edge parts include curvature change points between most protruding points farthest from the seating face and cutting edge tips of the arc-shaped cutting edge parts.

A round cutting insert for a milling tool having a center axis and a neutral plane extending perpendicularly thereto. The round cutting insert includes a circumferential side surface surrounding the center axis between upper and lower round main surfaces. An upper cutting edge is formed along the intersection of the upper round main surface and the side surface. A plurality of elongated support grooves are arranged in the side surface. Each elongated support groove has a bottom surface extending in a lengthwise direction with opposite flank surfaces converging toward the bottom surface and extending in parallel with the lengthwise direction of the elongated support groove. The lengthwise direction of each elongated support groove forms an acute angle with the neutral plane as seen in a side view. At least one of the opposite flank surfaces of each elongated support groove is configured as a side support surface.

Cutting inserts are disclosed having four cutting edges and milling tools comprising the cutting inserts installed in pockets on a rotatable cutting tool holder. The cutting inserts comprise a front face, a rear face and four side faces extending between the front and rear faces. A cutting edge is provided at the intersection of the front face and each side face. Each cutting edge comprises a plurality of cutting edge segments, including a facet cutting edge that forms the flat surface of a workpiece being milled, and a straight lead cutting edge that extends at an angle away from the facet cutting edge. The lead cutting edge angle is selected to provide effective milling of the workpiece at entry. The cutting inserts have side seating surfaces that allow the inserts to be more stably supported in cutting insert pockets.

A tool for cutting processing has a base member which has a rotation axis about which the tool rotates during operation, a seat which is formed on the base member for receiving a replaceable cutting insert, a securing screw for securing the cutting insert to the seat, and a cutting insert which is secured to the seat. The seat has a base face for supporting a lower side of the cutting insert, a first lateral abutment face which supports the cutting insert in a radially inward direction, and a second lateral abutment face which supports the cutting insert axially and in a radially outward direction and a hole for receiving the securing screw is formed in the base face. The hole has with spacing from the base face a threaded hole and closer in the direction of the base face a thread-free hole portion.

A cutting tool holder of the kind in which the fastening screw (securing member) remains engaged with the tool holder seat during mounting/dismounting of the cutting insert. The seat is further formed with a support surface configured for engaging and providing support to the head portion of the securing member at least in the securing position.

A method for machining of ball tracks of an inner race of a constant velocity joint includes the step of providing a power skiving tool having a plurality of cutting members and a first axis of rotation and providing a work piece having an outer envelope surface extending along an axis of rotation. The first axis of rotation of the power skiving tool is arranged at a first distance from the axis of rotation of the work piece and oriented at a first angle. A first rotational speed to the power skiving tool and a second rotational speed to the work piece and a relative movement between the work piece and the power skiving tool, is applied such that the cutting members engage the outer envelope surface to machine the ball tracks. A cutting insert and a power skiving cutting tool are also provided.

A cutting insert for a shoulder milling tool has a trigonal shape and includes a first surface, a second surface, and a circumferential surface extending between the first surface and the second surface. The circumferential surface includes a countersunk circumferential waist portion. The circumferential surface has a first and a second clearance surface extending along a first and a second main cutting edge. Each of the first and second clearance surfaces forma a negative nominal clearance angle. Each of the first and second main cutting edges is arranged inside the countersunk circumferential waist portion, as seen in the view towards the first and second surfaces, respectively.

A minor cutting edge has a first minor cutting edge and a second minor cutting edge that extends inward of the insert in a direction of an insert short side face axial line, as the second minor cutting edge extends from the first minor cutting edge in a direction of an insert major face axial line. A flank face of the second minor cutting edge is inclined outward of the insert in the direction of the insert short side face axial line, as the flank face extends from the second minor cutting edge in the direction of an insert long side face axial line, and is inclined outward of the insert in the direction of the insert short side face axial line, as the flank face extends from a major face adjacent to the flank face in the direction of the insert major face axial line.

A cutting insert includes a first and a second pair of opposing side surfaces. As seen towards a first side surface, a first axial relief face and a first axial abutment face form part of a first surface grouping on a first side of a longitudinal plane. As seen towards a second side surface, a second axial relief face and a second axial abutment face form part of a second surface grouping on the first side of the longitudinal plane. The first axial abutment face forms a substantially flat surface and extends perpendicularly to a median plane of the insert. The second axial abutment face forms a substantially flat surface and extends perpendicularly to the median plane. A second side surface of the first pair of opposing side surfaces has a first and a second radial abutment face.

An indexable and double-sided round cutting insert includes an upper and lower side. A center axis extends between the upper and lower side and a median plane extends perpendicular to the center axis and is situated halfway between the upper and lower side. A side surface has an upper and lower positive clearance surface at an upper positive clearance angle with respect to an upper cutting edge and a lower positive clearance angle with respect to a lower cutting edge. A plurality of protrusions extends along the side surface and protrude in a radial direction perpendicular to the center axis. Each protrusion includes an outer surface, which along the center axis, extends such that a first radial distance from the center axis to the outer surface in the median plane is at least equal to or greater than a second radial distance from the center axis to the outer surface.