A precision machine tool includes: a tool support for supporting a tool; a tool table serving as a moving mechanism capable of moving the tool support; and one or multiple imaging devices fixed to the tool support, the imaging devices each having an imaging unit configured to capture the image of a machining point on a workpiece machined by the tool.

A precision machine tool includes: a tool support for supporting a tool; a tool table serving as a moving mechanism capable of moving the tool support; and one or multiple imaging devices fixed to the tool support, the imaging devices each having an imaging unit configured to capture the image of a machining point on a workpiece machined by the tool.

Provided is a machining method for a workpiece that is rotated in a machine tool having a main spindle, in which modification of the machine tool is not necessary when machining the workpiece. The machining method for the workpiece includes: a first mounting step in which a workpiece holder that is holding the workpiece is mounted onto the main spindle of the machine tool; and a first machining step in which the main spindle is rotated and the workpiece is machined by a first tool installed on a table of the machine tool.

A cutting tip, a cutting tool and a gear edge cut-off device have greater ease-of-use than the conventional art. The cutting tip has a shaft portion supported linearly movably and forwardly biased in a linearly moving direction, an angular base portion provided at a front end of the shaft portion and having a pair of skirt faces and a ridge portion that extends obliquely with respect to the linearly moving direction, a groove depressed near the ridge portion of the skirt face, a blade edge on the cutting blade, positioned on a border line between the ridge portion and the groove, a rake face provided on the cutting blade and positioned further toward the groove side than the blade edge, and a flank face positioned further toward the ridge portion side than the blade edge and jutting out in the forward direction as it retracts from the blade edge.

A tailstock for supporting a workpiece along a vertical rotary axis includes a base member, and a housing having a wall including a first end, and a second end, an outer surface, and an inner surface defining a central passage extending between the first and second ends defining a longitudinal axis. The second end is coupled to the base member. A workpiece support extends through the central passage. The workpiece support includes a first end, a second end and an intermediate portion extending therebetween. A linear bearing is coupled to the base member in the central passage. The linear bearing slideably receives the second end of the workpiece support. A displacement sensor assembly includes a stationary portion mounted relative to one of the base member and the housing, and a moveable portion mounted to the second end of the workpiece support.

The method can include: assembling the part to be machined to a pallet into an assembly; measuring a centering of the part relative to the pallet; adjusting the centering of the part relative to the pallet based on said measuring; repeating the steps of measuring and adjusting until determining that the part is centered based on said measuring; and mounting the centered assembly to an automatic machining device and machining the part of the centered assembly with the automatic machining device.

Provided is a machine tool control device that can realize a desired scrap length while suppressing deterioration in machining accuracy. This control device 1 is for a machine tool which performs machining while causing a tool and a workpiece to oscillate relative to each other, the control device 1 being provided with: an oscillation command generation unit 13 for generating an oscillation command on the basis of an oscillation condition; an oscillation command correction unit 14 for correcting the oscillation command so that main-axis phases in given oscillation phases are not identical to each other; and a position/speed control unit 18 for causing the tool and the workpiece to oscillate relative to each other on the basis of a superposition command generated by superposing the oscillation command corrected by the oscillation command correction unit 14 on a movement command.

A mount for firearm assembly and adjustment includes a firearm engagement portion having a hollow body with at least one recess for receiving a firearm buffer tube therein, and a support member configured to be secured to a support.

An insert may include a main body. The main body may include a first surface, a second surface, a side surface, a first cutting edge and a through hole. The side surface may be located between the first surface and the second surface. The first cutting edge may be located on at least a part of a ridge line where a first side surface of the side surface intersects with a second side surface adjacent to the first side surface. The through hole may open into the first surface. The main body may further include a first concave part located from the first surface to the side surface. The first concave part may be located away from an imaginary straight line connecting the first cutting edge and a center of the through hole in a front view of the first surface.

An insert may include a main body. The main body may include a first surface, a second surface, a side surface, a first cutting edge and a through hole. The side surface may be located between the first surface and the second surface. The first cutting edge may be located on at least a part of a ridge line where a first side surface of the side surface intersects with a second side surface adjacent to the first side surface. The through hole may open into the first surface. The main body may further include a first concave part located from the first surface to the side surface. The first concave part may be located away from an imaginary straight line connecting the first cutting edge and a center of the through hole in a front view of the first surface.