This invention relates to cutting tools used to machine materials to produce new surfaces and chips of removed material. Embodiments of this invention allow round rotating cutting inserts to be used in a more economical way, with improved accuracy, with improved sealing, and with greater ease of use. The rotary support device and cutting inserts may be used in either radial or tangential mounting types of cutters. It also provides a built-in, fully sealed means of fine adjustment of the cutting insert that is useful in some applications.

Disclosed is a wheel cap section chamfering device, comprising a main frame, a secondary frame, a lower servo motor, a key, a bearing seat, a left bearing seat, a left shaft, a left bearing, a left driven friction wheel, a left sleeve, left corner cylinder pressure claws, a left turntable, a left mandrel seat, a left mandrel, a chamfer mill, a tool apron, a feeding platform, a feeding cylinder, guide sleeves, guide posts, a support plate, guide rails, a compression cylinder, a translation sliding table, an upper servo motor, a driving friction wheel, a right mandrel, a right mandrel seat, a right turntable, right corner cylinder pressure claws, a right sleeve, a right driven friction wheel, a right bearing, a right shaft, a right bearing seat, a station rotating platform, a shaft and a bearing.

The invention relates to a stop for a rotating drilling, milling or countersinking tool which comprises a stop sleeve which is freely rotatably coupled, by means of a sliding or rolling bearing, around the tool. A first bearing bush of the bearing supports the stop sleeve. A second bearing bush of the bearing sits in a rotationally fixed manner on a shaft sleeve. The shaft sleeve can be pushed and fastened on a shaft of the tool. In a secondary aspect, the invention relates to a drilling, milling or countersinking tool having such a stop.

A ball bearing cage includes a plurality of ball pockets, wherein each ball pocket serves for receiving a ball, wherein each ball pocket (12, 22) has a width (B) in axial direction of the ball bearing cage (10, 20) and a length in circumferential direction of the ball bearing cage (10, 20), with the width (B) being slightly greater than a diameter of the ball (30), wherein the length is greater than the width (B) of the ball pocket (12,22) at least at an outer circumference (U.sub.A) of the ball bearing cage (10), and the length (L.sub.A) of the ball pocket (12,22) at the outer circumference (U.sub.A) of the ball bearing cage (10) is greater than the length (L.sub.I) of the ball pocket (12,22) at the inner circumference (U.sub.I) of the ball bearing cage (10,20).

Disclosed is a wheel cap section chamfering device, comprising a main frame, a secondary frame, a lower servo motor, a key, a bearing seat, a left bearing seat, a left shaft, a left bearing, a left driven friction wheel, a left sleeve, left corner cylinder pressure claws, a left turntable, a left mandrel seat, a left mandrel, a chamfer mill, a tool apron, a feeding platform, a feeding cylinder, guide sleeves, guide posts, a support plate, guide rails, a compression cylinder, a translation sliding table, an upper servo motor, a driving friction wheel, a right mandrel, a right mandrel seat, a right turntable, right corner cylinder pressure claws, a right sleeve, a right driven friction wheel, a right bearing, a right shaft, a right bearing seat, a station rotating platform, a shaft and a bearing.

A guide 2 for a burr cutter 34, the guide 2 comprising: a body portion 4 having first and second guide surfaces 12a, 12b which are spaced from one another to define a slot 14 between the first and second guide surfaces 12a, 12b; a bearing 32a, 32b for rotatably mounting the body portion 4 to a shank 38 of the burr cutter 34 with a cutting head 36 of the burr cutter 34 adjacent the slot 14; wherein the first and second guide surfaces 12a, 12b and the bearing 32a, 32b are positioned relative to one another such that the first and second guide surfaces 12a, 12b are tangential to the cutting head 36 of the burr cutter 34.

An indexable mill includes a tool holder and an indexable bit. The tool holder has a positioning shaft whose one side is provided with a braking block that has curved mortises. The positioning shaft is centrally provided with a threaded hole. The indexable bit is centrally provided with a positioning hole. The positioning hole of the indexable bit has its one side formed with a braking notch. The plug-socket like connection between the positioning shaft of the tool holder and the positioning hole of the indexable bit provides a first positioning function. The wrapping, curved surface contact between the braking block and the braking notch provides a second positioning function. The dual positioning enhances stability and rigidity of the combination.

Electric spindle for numerical control machines structured to lock and rotationally drive a tool about a predetermined reference axis locally coinciding with the longitudinal axis of the tool; the electric spindle comprising: an outer structural casing that is structured to be rigidly attachable to a generic numerical control machine; an electric motor that is housed within the structural casing and is provided with a drive shaft, which projects/emerges with its front end outside the structural casing while remaining locally coaxial to the reference axis of the electric spindle; a rotating thrust-bearing bushing or sleeve, which is fitted in an axially rotatable manner on the front end of the drive shaft via interposition of a first set of annular rolling bearings, and is maintained coaxial to the reference axis of the electric spindle by a second set of annular rolling bearings, which are interposed between the rotating bushing or sleeve and the structural casing; and at least one disassemblable tool-holder head that is structured to be attachable, in a rigid and stable though easily releasable manner, to the front end of the drive shaft, is structured so as to accommodate and retain, in a rigid and stable though easily releasable manner, the shank of a generic tool for numerical control machines, and is provided with a peripheral crown that is dimensioned/structured to stably abut, selectively and alternatively, on the front end of the drive shaft or on the rotating thrust-bearing bushing or sleeve.

A ball bearing cage includes a plurality of ball pockets, wherein each ball pocket serves for receiving a ball, wherein each ball pocket (12, 22) has a width (B) in axial direction of the ball bearing cage (10, 20) and a length in circumferential direction of the ball bearing cage (10, 20), with the width (B) being slightly greater than a diameter of the ball (30), wherein the length is greater than the width (B) of the ball pocket (12,22) at least at an outer circumference (U.sub.A) of the ball bearing cage (10), and the length (L.sub.A) of the ball pocket (12,22) at the outer circumference (U.sub.A) of the ball bearing cage (10) is greater than the length (L.sub.I) of the ball pocket (12,22) at the inner circumference (U.sub.I) of the ball bearing cage (10,20).

The present invention provides a beveling tool including: a body with a shaft hole formed through the center; a plurality of cutter blades arranged at predetermined distances on the circumferential surface of the body, each having a radial primary blade with a radial primary relief angle ranging from about 10 to about 20 degrees and a radial secondary blade with a radial secondary relief angle ranging from about 25 to about 35 degrees (or about 35 to about 45 degrees); discharge grooves formed longitudinally between the cutter blades to discharge chips produced in beveling; and a shank inserted in the shaft hole of the body, in which the body and the shank are connected by brazing. With the beveling tool of the present invention, it is possible to smoothly discharge chips produced in beveling and to prevent damage to the cutter blades.