An indexable rotary cutting tool and insert is capable of performing a high-accuracy cutting process with high efficiency. A twist angle of an outer peripheral cutting edge of the tool has a positive value, an axial rake angle of the cutting edge of a corner R of the tool at a boundary point between the cutting edge of the corner R and the outer peripheral cutting edge has a positive value, the axial rake angle of the cutting edge of the corner R at a reference point has a negative value, and the radial rake angle at least between the boundary point and the reference point in an entire edge length region of the cutting edge of the corner R has a negative value. The radial rake angle at the reference point is smaller than the radial rake angle at the boundary point.

A method of milling a profile of a railway rail comprises: rotating a milling cutter including a plurality of face mounted cutting inserts mounted about a periphery thereof, milling a railway rail with cutting edges of the cutting inserts rotating in a predetermined plane corresponding to at least a portion of a desired rail profile while controlling the depth of cut of the cutting inserts; traversing the railway rail with the milling cutter while milling the railway rail and controlling the speed of traverse of the milling cutter along the railway rail.

A mirror finishing method for mirror-finishing a workpiece includes: a step of performing a first machining operation with a first tool which has a cylindrical portion made of polycrystalline diamond or cubic boron nitride at the tip of a shank thereof and further has a cutting edge formed by forming a linear groove on the cylindrical portion; and a step of, after the first machining operation has been performed, performing a second machining operation with a second tool which has a cylindrical portion made of polycrystalline diamond or cubic boron nitride at the tip of a shank thereof with no cutting edge on the cylindrical portion.

A compression milling cutter includes a shank and a front cutting portion that terminates at a leading end of the milling cutter. The front cutting portion has a first circumferential row of one or more insert receiving pockets proximate a leading end of the milling cutter, and a second circumferential row of one or more insert receiving pockets, each insert receiving pocket configured to receive a respective indexable cutting insert. The cutting insert mounted in the first circumferential row has a positive axial rake angle, A, and the indexable cutting insert mounted in an insert pocket of the second circumferential row has a negative axial rake angle, B. Because of the different axial rake angles, chips generated during a machining operation flow in opposite directions, thereby creating a compression zone disposed between the first and second circumferential rows. This compression zone replicates the cutting action of a solid end mill, particularly when machining fiber reinforced plastic materials.

A surgical bur including flutes and lands. Each of the flutes includes a cutting edge, rake surfaces and a clearance surface. The rake surfaces of one of the flutes are decoupled from each other. Each of the lands is disposed between a pair of the flutes.

The present disclosure provides a cutting insert that is economical and can be stably fixed to a tool body. A first edge line (10R) of a cutting insert (2) is a rectangle having a first side (11) and a third side (13) as long sides and a second side (12) and a fourth side (14) as short sides. Cutting edges are formed at the first side (11), the second side (12) and the third side (13); on the other hand no cutting edge is formed at the fourth side (14). At a second edge line (20R) having the same shape as the first edge line (10R), a sixth side (22) where a cutting edge is formed is opposite to the fourth side (14), and an eighth side (24) where a cutting edge is not formed is opposite to the second side (12). A peripheral side surface (30) includes a fourth side surface (34) facing the fourth side (14) and the sixth side (22). The fourth side surface (34) extends from a first end surface (10) to a second end surface (20) and is inclined in a direction from the second side (12) to the fourth side (14).

A method of milling a profile of a railway rail comprises: rotating a milling cutter including a plurality of face mounted cutting inserts mounted about a periphery thereof; milling a railway rail with cutting edges of the cutting inserts rotating in a predetermined plane corresponding to at least a portion of a desired rail profile while controlling the depth of cut of the cutting inserts; traversing the railway rail with the milling cutter while milling the railway rail; and controlling the speed of traverse of the milling cutter along the railway rail.

A compression milling cutter includes a shank and a front cutting portion that terminates at a leading end of the milling cutter. The front cutting portion has a first circumferential row of one or more insert receiving pockets proximate a leading end of the milling cutter, and a second circumferential row of one or more insert receiving pockets, each insert receiving pocket configured to receive a respective indexable cutting insert. The cutting insert mounted in the first circumferential row has a positive axial rake angle, A, and the indexable cutting insert mounted in an insert pocket of the second circumferential row has a negative axial rake angle, B. Because of the different axial rake angles, chips generated during a machining operation flow in opposite directions, thereby creating a compression zone disposed between the first and second circumferential rows. This compression zone replicates the cutting action of a solid end mill, particularly when machining fiber reinforced plastic materials.

A molding cutter includes a cutter bar and a cutter head. The cutter head is mounted on one end of the cutter bar. The cutter head includes a main body and a number of cutter teeth. The main body includes a first end face, a second end face, and a curved surface. The first end face is coupled to the cutter bar, and the curved surface is coupled between the first end face and the second end face. The cutter teeth are mounted on the curved surface. A quantity of the number of cutter teeth is equal to a positive integer within a range from 8 to D*15. D is equal to a diameter of the main body of the cutter head in millimeters.

A ball cutter includes a cutter bar and a cutter head. The cutter head has one end mounted to the cutter bar. The cutter head includes a main body and a number of cutter teeth mounted on the main body. A quantity of the cutter teeth is equal to a positive integer within a range from 8 to D*15. D is equal to a diameter of the main body of the cutter head in millimeters.