A method for forming dimples on a workpiece includes providing a rotary cutting tool. The rotary cutting tool includes a cutting edge that protrudes in a leading direction parallel to a longitudinal axis of the tool. The cutting edge extends from a position at the leading end of the rod-shaped main body that is radially offset from the longitudinal axis. The rotary cutting tool is set such that the longitudinal axis of the rotary cutting tool is inclined relative to a line perpendicular to the processing surface of the workpiece. The rotary cutting tool is moved along the processing surface while the rotary cutting tool is rotated about the axis. The processing surface is cut by the cutting edge to form the dimples, which are spaced apart from each other on the processing surface.

A method for forming dimples on a workpiece includes providing a rotary cutting tool. The rotary cutting tool includes a cutting edge that protrudes in a leading direction parallel to a longitudinal axis of the tool. The cutting edge extends from a position at the leading end of the rod-shaped main body that is radially offset from the longitudinal axis. The rotary cutting tool is set such that the longitudinal axis of the rotary cutting tool is inclined relative to a line perpendicular to the processing surface of the workpiece. The rotary cutting tool is moved along the processing surface while the rotary cutting tool is rotated about the axis. The processing surface is cut by the cutting edge to form the dimples, which are spaced apart from each other on the processing surface.

A cutter includes a rake face on which a recessed groove extending along a direction of a rotation axis of a rotary holder to be open at a flank face of the cutter are formed. The recessed groove includes a plurality of recessed grooves formed at predetermined intervals along a direction intersecting with the rotation axis. A cutting blade portion extending along a direction intersecting with the rotation axis is provided on a continuous portion of the rake face and the flank face. The cutting blade portion includes a first region made up of an intersecting portion of the rake face and the flank face and a second region made up of a peripheral edge portion of an opening portion of the recessed groove at the flank face.

A cutter includes a rake face on which a recessed groove extending along a direction of a rotation axis of a rotary holder to be open at a flank face of the cutter are formed. The recessed groove includes a plurality of recessed grooves formed at predetermined intervals along a direction intersecting with the rotation axis. A cutting blade portion extending along a direction intersecting with the rotation axis is provided on a continuous portion of the rake face and the flank face. The cutting blade portion includes a first region made up of an intersecting portion of the rake face and the flank face and a second region made up of a peripheral edge portion of an opening portion of the recessed groove at the flank face.

Proposed in a milling head, which has a plurality of machining milling teeth and tooth gaps arranged therebetween, whereby the milling teeth and the tooth gaps are arranged along a circumferential surface of the milling head, which milling head is to be provided with a number of milling teeth, which is greater than and/or substantially equal to the number of milling teeth ascertained using the equation y=a.Math.x.sup.5+b.Math.x.sup.4+c.Math.x.sup.3+d.Math.x.sup.2+e.Math.x+f , wherein x is the diameter of the milling head in millimeters and y is the tooth pitch, i.e. the distance between two adjacent milling teeth in millimeters, and it substantially applies that the value of a ranges between a=1.7.Math.10.sup.9 and a=2.3.Math.10.sup.9 , the value of b between b=5.Math.10.sup.7 and b=11.Math.10.sup.7 , the value of c between c=0.7.Math.10.sup.4 and c=1.3.Math.10.sup.4, the value of d between d=8.5.Math.10.sup.3 and d=9.7.Math.10.sup.3, the value of e between e=2.6.Math.10.sup.1 and e=3.7.Math.10.sup.1 and the value of f between f=1.5.Math.10.sup.1 and f=2.6.Math.10.sup.1.

Proposed in a milling head, which has a plurality of machining milling teeth and tooth gaps arranged therebetween, whereby the milling teeth and the tooth gaps are arranged along a circumferential surface of the milling head, which milling head is to be provided with a number of milling teeth, which is greater than and/or substantially equal to the number of milling teeth ascertained using the equation y=a.Math.x.sup.5+b.Math.x.sup.4+c.Math.x.sup.3+d.Math.x.sup.2+e.Math.x+f , wherein x is the diameter of the milling head in millimeters and y is the tooth pitch, i.e. the distance between two adjacent milling teeth in millimeters, and it substantially applies that the value of a ranges between a=1.7.Math.10.sup.9 and a=2.3.Math.10.sup.9 , the value of b between b=5.Math.10.sup.7 and b=11.Math.10.sup.7 , the value of c between c=0.7.Math.10.sup.4 and c=1.3.Math.10.sup.4, the value of d between d=8.5.Math.10.sup.3 and d=9.7.Math.10.sup.3, the value of e between e=2.6.Math.10.sup.1 and e=3.7.Math.10.sup.1 and the value of f between f=1.5.Math.10.sup.1 and f=2.6.Math.10.sup.1.

A cutting tool is a cutting tool constituted of a formed end mill, and includes a shank portion, a back chamfering edge portion, and an outer peripheral cutting edge portion. The back chamfering edge portion has a back chamfering edge. The outer peripheral cutting edge portion is located between the shank portion and the back chamfering edge portion and has a cutting edge at an outer peripheral surface of the outer peripheral cutting edge portion. The cutting edge of the outer peripheral cutting edge portion is a right hand cut left hand helix edge.

A cutting tool is a cutting tool constituted of a formed end mill, and includes a shank portion, a back chamfering edge portion, and an outer peripheral cutting edge portion. The back chamfering edge portion has a back chamfering edge. The outer peripheral cutting edge portion is located between the shank portion and the back chamfering edge portion and has a cutting edge at an outer peripheral surface of the outer peripheral cutting edge portion. The cutting edge of the outer peripheral cutting edge portion is a right hand cut left hand helix edge.

A frictional drive railway wheel truing system comprising a master lift and drive arm spaced from a slave lift and drive arm extending from within a railway pit for lifting a pair of opposed railway wheels off railway rails. Each master and slave drive assembly comprising frictional drums to turn a railway wheel from a wheel flange. A master and slave lathe assembly moveable along an axis parallel to a rotational axis of the frictional drums; each master and slave lathe assembly having a cutting bit positioned to engage a tread and a flange of a railway wheel in a cut mode at a location superior to the contact area of said frictional drums and railway wheel; and a hold down device fixing rotation of a railway wheel to a predetermined axis during a wheel truing operation.

A frictional drive railway wheel truing system comprising a master lift and drive arm spaced from a slave lift and drive arm extending from within a railway pit for lifting a pair of opposed railway wheels off railway rails. Each master and slave drive assembly comprising frictional drums to turn a railway wheel from a wheel flange. A master and slave lathe assembly moveable along an axis parallel to a rotational axis of the frictional drums; each master and slave lathe assembly having a cutting bit positioned to engage a tread and a flange of a railway wheel in a cut mode at a location superior to the contact area of said frictional drums and railway wheel; and a hold down device fixing rotation of a railway wheel to a predetermined axis during a wheel truing operation.