A rotary cutting tool is provided which, although it has a simple configuration, allows the arrangement of each cutting edge to be easily adjusted. A first cartridge mounting seat has an upper wall surface opposing an outer side surface of a cartridge and further has a first recessed part into which a protrusion is inserted and which comes into contact, at a bottom thereof, with a leading end of the protrusion. A second cartridge mounting seat has an upper wall surface opposing an outer side surface of a cartridge and further has a second recessed part into which a protrusion is inserted and which comes into contact, at a bottom thereof, with a leading end of the protrusion. A depth of the second recessed part is greater than a depth of the first recessed part. An amount of protrusion P of the protrusion is equal to or greater than the depth of the second recessed part.

A cutting insert and a gear milling cutter is disclosed. A first major side portion of an insert body of the cutting insert is provided with a first recess having a first bottom surface (24a) and a second major side portion is provided with a second recess having a second bottom surface. The first and second bottom surfaces extend substantially in parallel with a longitudinal axis of the insert body. A first minor side portion is provided with a third recess having a third bottom surface and a second minor side portion is provided with a fourth recess having a fourth bottom surface, the third and fourth bottom surfaces extending across the longitudinal axis. Thus, the cutting insert may be supported in a relevant gear milling cutter against one of the first and second bottom surfaces and against one of the third or fourth bottom surfaces.

An indexable cutting insert has opposing upper and lower end surfaces, and a peripheral surface including three side surfaces and three corner surfaces. Each corner surface intersects the upper end surface to form an upper cutting edge, and each side surface has a locating surface. The lower end surface has three radially outward facing lower abutment surfaces. The three locating surfaces define a first imaginary triangle having three first bisector planes and three locating planes, and the three lower abutment surfaces define a second imaginary triangle having three second bisector planes. None of the first and second bisector planes are coplanar, and each locating plane intersects two of the upper cutting edges. For each index position of the cutting insert in an insert receiving pocket of a cutting tool, one of the locating surfaces and one of the lower abutment surfaces is in contact with pocket walls thereof.

A cutting tool of an aspect is provided with a holder and a cutting insert attached to an insert pocket of the holder. The cutting insert includes a front end surface, a rear end surface, a front side surface, a rear side surface, an outer side surface, and an inner side surface. The cutting edge is disposed along a ridge line at an intersection between the front side surface and the front end surface, and a ridge line at an intersection between the front side surface and the outer side surface. The insert pocket includes a restraining surface that is in contact with the rear side surface, in a front end view, the restraining surface includes a projecting portion having a curved line shape projecting toward the front in the rotational direction, and the rear side surface includes a recessed portion that is in contact with the projecting portion.

A double-sided tangential cutting insert comprising a pair of cutting rake faces, a pair of major side surfaces and a pair of opposing minor side faces each having a twisted convex shape. Each of the cutting rake faces is defined between a pair of main cutting edges, a pair of full nose cutting edges, and a pair of opposing convex minor cutting edges. Each of the minor side faces is defined between one of the convex minor cutting edges at one of the rake faces and one of the convex minor cutting edges at the other one of the rake faces wherein, at each minor side face, a ridge line interconnects an apex of the convex minor edge at the one of the rake faces and an apex of the convex minor cutting edge at the other one of the rake faces. Other variants and embodiments are broadly contemplated herein.

A cutting tool of an aspect is provided with a holder and a cutting insert attached to an insert pocket of the holder. The cutting insert includes a front end surface, a rear end surface, a front side surface, a rear side surface, an outer side surface, and an inner side surface. The cutting edge is disposed along a ridge line at an intersection between the front side surface and the front end surface, and a ridge line at an intersection between the front side surface and the outer side surface. The insert pocket includes a restraining surface that is in contact with the rear side surface, in a front end view, the restraining surface includes a projecting portion having a curved line shape projecting toward the front in the rotational direction, and the rear side surface includes a recessed portion that is in contact with the projecting portion.

A plungeable cutting apparatus can include a cutting tool having at least one cutting insert. Each cutting insert can have a body sized and configured to define at least one cutting edge that is positioned for cutting into a work piece to define a recess, groove or other type of aperture. Some embodiments of the cutting apparatus can utilize an array of cutting inserts positioned along a distal periphery of a cutting tool of the cutting apparatus, for example. Each cutting insert can have a generally square configuration or other suitable shape. Some embodiments can be sized and shaped to help limit vibration during metalworking to help improve the life of the cutting insert and facilitate larger sized aperture formation via plungeable cutting operations that may also need less finishing work.