A rotatable cutter wheel of a material reduction machine, the cutter wheel including a drive plate configured to be mounted on the material reduction machine for rotation in a forward rotation direction about a central axis. The drive plate includes a central driveshaft aperture and an outer peripheral edge. A wear plate is positioned along a first axial side of the drive plate and removably coupled to the drive plate. A cutter is removably coupled for rotation with the drive plate via a fastener. A wear insert is positioned to cover a portion of the outer peripheral edge of the drive plate, the wear insert being mounted to the wear plate and held in spaced relation to the outer peripheral edge of the drive plate.

Ceramic end mill with cutting edge portion including gashes between cutting edges and adjacent in a rotation direction. Center cut edges are formed at end cutting edges close to and facing rotation axis O. Center grooves are formed on rear sides of center cut edges and end cutting edges in the rotation direction continuous with a radial direction. The center grooves are continuous with positions where end cutting edge second surfaces face or approach rotation axis O. End cutting edge second surfaces are laid between center cut edges and end cutting edges. Center grooves are formed between end cutting edge second surfaces and center cut edges positioned on a rear side of end cutting edge second surfaces in the rotation direction. The center grooves pass on rotation axis O. Center grooves double as rake faces of the respective center cut edges and are continuous with the gashes.

Provided is a tip dresser blade comprising a body of M-2 steel hardened to a Rockwell C hardness in the range of 63 to 66, inclusive, by double tempering. The body may be ground to provide a specific first geometry, or a specific second geometry, or a specific third geometry, or a specific fourth geometry.

The current invention proposes sharpening thin hardened metal blades with the hard turning process using a holder designed to hold the blades in a firm and stiff manner and a ceramic cutting tool held in a fixture. Generally, the cutting tool is held stationary in its fixture while the workpiece, in its holder, is rotated such that it repeatedly comes into controlled contact with the cutting tool. In sharpening operations such as proposed here, it is critical to (i) hold the workpiece firmly and rigidly, and (ii) position the cutting tool in a precise, predictable and reliable manner.

A tip dresser blade blank includes a casting, wherein the casting is ground to provide a geometry having a web width in the range of 0.25 mm to 3.00 mm, inclusive, a first blade depth in the range of 1.00 mm to 3.00 mm, inclusive, a second blade depth in the range of 2.30 mm to 6.30 mm, inclusive, a first Profile Angle in the range of 2 degrees to 35 degrees, inclusive, a first Cutting Edge in the range of 0.010 mm to 0.035 mm, inclusive, and a second Cutting Edge in the range of 0.010 mm to 0.035 mm, inclusive.

Provided is a tip dresser blade comprising a body of M-2 steel hardened to a Rockwell C hardness in the range of 63 to 66, inclusive, by double tempering. The body may be ground to provide a specific first geometry, or a specific second geometry, or a specific third geometry, or a specific fourth geometry.

Provided is a tip dresser blade comprising a body of M-2 steel hardened to a Rockwell C hardness in the range of 63 to 66, inclusive, by double tempering. The body may be ground to provide a specific first geometry, or a specific second geometry, or a specific third geometry, or a specific fourth geometry.

A tip dresser blade blank includes a casting, wherein the casting is ground to provide a geometry having a web width in the range of 0.25 mm to 3.00 mm, inclusive, a first blade depth in the range of 1.00 mm to 3.00 mm, inclusive, a second blade depth in the range of 2.30 mm to 6.30 mm, inclusive, a first Profile Angle in the range of 2 degrees to 35 degrees, inclusive, a first Cutting Edge in the range of 0.010 mm to 0.035 mm, inclusive, and a second Cutting Edge in the range of 0.010 mm to 0.035 mm, inclusive.

A rotatable cutter wheel of a material reduction machine, the cutter wheel including a drive plate configured to be mounted on the material reduction machine for rotation in a forward rotation direction about a central axis. The drive plate includes a central driveshaft aperture and an outer peripheral edge. A wear plate is positioned along a first axial side of the drive plate and removably coupled to the drive plate. A cutter is removably coupled for rotation with the drive plate via a fastener. A wear insert is positioned to cover a portion of the outer peripheral edge of the drive plate, the wear insert being mounted to the wear plate and held in spaced relation to the outer peripheral edge of the drive plate.

Provided is a tip dresser blade blank comprising a casting of M-2 steel hardened to a Rockwell C hardness in the range of 63 to 66, inclusive, by double tempering. The casting may be ground to provide a specific first geometry or a specific second geometry.