Tool assembly for a rotating device having a drive, a control and a supporting arrangement for at least one tool insert. In order to provide a device for off-round turning which can be constructed with little technical and mechanical effort and nonetheless be used at almost any axial position of a workpiece, the application proposes a tool assembly of the type mentioned above. The tool assembly is designed as a crank drive assembly, wherein the supporting arrangement has a swinging piston unit and the crank drive assembly has a crank unit, and the swinging piston unit and the crank unit are connected to one another by a thrust rod unit.

A method for machining a workpiece, includes: rotating a rotary tool around a rotation axis, the rotary tool including at least one edge positioned on an outer periphery of the rotary tool around the rotation axis; relatively moving the rotary tool toward the workpiece in a first direction so that the at least one edge cuts the workpiece by a predetermined depth while the rotary tool is rotated around the rotation axis; and relatively moving the rotary tool with respect to the workpiece in a second direction that is substantially perpendicular to the first direction and that is inclined to a third direction substantially perpendicular to the rotation axis and the first direction.

An apparatus to produce a letterbox using a strip of material includes: a bender to receive and bend the strip of material into a desired shape of a letterbox including flanges and notches, and the bender to bend at least one end of the strip of material slightly to produce a slight bent; a processor to measure a first plurality of hole positions on a first end of the strip of material and a second plurality of hole positions on flanges of the strip of material, wherein the first plurality of hole positions on the first end are measured to match a first plurality of holes on a second end of the strip of material, wherein the second plurality of hole positions on the flanges are measured to match a second plurality of holes on a base plate; and a puncher to punch the first plurality of holes on at least one of the first end and the second end of the strip of material according to the first plurality of hole positions, and the puncher to punch the second plurality of holes on the flanges according to the second plurality of hole positions.

An apparatus to produce a letterbox using a strip of material includes: a bender to receive and bend the strip of material into a desired shape of a letterbox including flanges and notches, and the bender to bend at least one end of the strip of material slightly to produce a slight bent; a processor to measure a first plurality of hole positions on a first end of the strip of material and a second plurality of hole positions on flanges of the strip of material, wherein the first plurality of hole positions on the first end are measured to match a first plurality of holes on a second end of the strip of material, wherein the second plurality of hole positions on the flanges are measured to match a second plurality of holes on a base plate; and a puncher to punch the first plurality of holes on at least one of the first end and the second end of the strip of material according to the first plurality of hole positions, and the puncher to punch the second plurality of holes on the flanges according to the second plurality of hole positions.

A device for the machining of curved laminar surfaces, having a first part including a tool for machining the concave face of the surface, and first pressure device in contact with the concave face of the surface, a second part including second pressure device in contact with the convex face of the surface, and devices synchronizing the movements of the first and second parts is provided. The tool has a circular shape for the radial machining of the concave face, and the first pressure device has at least one disc parallel to the tool, the tool and disc disposed on a rotary shaft and both having a radius equal to or less than the radius of curvature of the concave face.

An automatic lathe includes a main spindle that rotates a workpiece about a shaft center, a cutting tool that processes the workpiece, a feeder that moves the cutting tool, an input receiver that receives inputs regarding an eccentric distance and a radius, and a controller that controls the movement by the feeder such as to set a virtual circle having a radius of the distance, to set an offset virtual circle having a center at a position where a center of the virtual circle is offset from the shaft center of the workpiece in the radial direction of the workpiece by the radius, and to move the cutting tool along an circumference of the offset virtual circle in relation to a rotation of the workpiece by the main spindle. A hole is processed, which has the radius at a position away from the shaft center by the distance.

A polygon machining method whereby first polygon machining using a polygon cutter is carried out on a workpiece, followed by machining using tools other than the polygon cutter, then second polygon machining using the polygon cutter again. The polygon machining method comprises: a first polygon machining step in which a main axis and a tool main axis are synchronously rotated such that the rotation speed of the main axis and the tool main axis are at a ratio required for the first polygon machining, and polygon machining is carried out; a machining step in which the ratio is changed to a second synchronization ratio such that the main axis rotates at a rotation speed required for machining after the first polygon machining, the main axis and the tool main axis are synchronously rotated, and machining is carried out on the workpiece that has received the first polygon machining; and a second polygon machining step in which the main axis and the tool main axis are synchronously rotated such that the rotation speed of the main axis and the tool main axis are at a ratio required for the second polygon machining, and polygon machining is carried out.

A polygon machining method whereby first polygon machining using a polygon cutter is carried out on a workpiece, followed by machining using tools other than the polygon cutter, then second polygon machining using the polygon cutter again. The polygon machining method comprises: a first polygon machining step in which a main axis and a tool main axis are synchronously rotated such that the rotation speed of the main axis and the tool main axis are at a ratio required for the first polygon machining, and polygon machining is carried out; a machining step in which the ratio is changed to a second synchronization ratio such that the main axis rotates at a rotation speed required for machining after the first polygon machining, the main axis and the tool main axis are synchronously rotated, and machining is carried out on the workpiece that has received the first polygon machining; and a second polygon machining step in which the main axis and the tool main axis are synchronously rotated such that the rotation speed of the main axis and the tool main axis are at a ratio required for the second polygon machining, and polygon machining is carried out.

A polygon machining method whereby first polygon machining is carried out on a workpiece held by a main axis, by using a polygon cutter attached to a tool main axis, then machining using a tool other than the polygon cutter is carried out, and second polygon machining after said machining is carried out, using the polygon cutter. The polygon machining method comprises: a synchronized stopping step in which the main axis is stopped at a predetermined prescribed rotation position, in a state in which the main and the tool main axis during polygon machining are synchronously rotated when the first polygon machining has been completed; a synchronization release step in which the synchronization of the main axis and the tool main axis is released when starting machining after the first polygon machining; a main axis stopping step in which the main axis is stopped at a prescribed rotation position when the machining after first polygon machining has been completed; and a synchronization starting step in which the main axis and the tool main axis are synchronously rotated when starting second polygon machining.

A polygon machining method whereby first polygon machining is carried out on a workpiece held by a main axis, by using a polygon cutter attached to a tool main axis, then machining using a tool other than the polygon cutter is carried out, and second polygon machining after said machining is carried out, using the polygon cutter. The polygon machining method comprises: a synchronized stopping step in which the main axis is stopped at a predetermined prescribed rotation position, in a state in which the main and the tool main axis during polygon machining are synchronously rotated when the first polygon machining has been completed; a synchronization release step in which the synchronization of the main axis and the tool main axis is released when starting machining after the first polygon machining; a main axis stopping step in which the main axis is stopped at a prescribed rotation position when the machining after first polygon machining has been completed; and a synchronization starting step in which the main axis and the tool main axis are synchronously rotated when starting second polygon machining.