A complex machine tool for cylindrical workpieces has a bed, a headstock assembly, at least one supporting assembly, and at least one machining assembly. The bed has three tracks being respectively a first track, a second track, a third track arranged in order. Each one of the three tracks defines a respective guiding direction, and the three guiding directions of the three tracks are mutually parallel. The headstock assembly is connected to the bed, and is located near one of two ends of the second track. The at least one supporting assembly is mounted on one of the three tracks and is used for supporting the cylindrical workpiece. The at least one machining assembly is mounted on one of the three tracks, is slidable along the track, and is located on a position at a spaced interval from the at least one supporting assembly.

A tooling assembly for a lathe machine includes a tool platform configured to be mounted on the lathe machine, a milling tool holder fixedly secured to the tool platform and workable to releasably secure a thread milling tool therein, and a milling tool drive. The milling tool drive is operatively connected to the milling tool holder and operable to rotate the milling tool holder independently of a work holder to mill threads on the workpiece when a pipe thread milling tool is secured in the milling tool holder. Computer numerical control threading lathes and methods of milling threads in tubular workpieces are also described.

An NC lathe including a first spindle, a second spindle capable of holding a cut-off workpiece delivered from the first spindle, a second tool post on which a plurality of tools are attachable to machine the workpiece held by the second spindle, a product receiver provided on the second tool post, a Y2-axis motor capable of moving at least one of the second tool post and the second spindle in a Y2-axis direction, and an X2-axis motor capable of moving at least one of the second tool post and the second spindle in an X2-axis direction. The second tool post has a plurality of tool mounting parts where the tools are attachable. The tool mounting parts are aligned at intervals in the Y2-axis direction. At least one of the tool mounting parts is arranged in a position overlapping the product receiver with respect to the X2-axis direction.

An NC lathe including a first spindle, a second spindle capable of holding a cut-off workpiece delivered from the first spindle, a second tool post on which a plurality of tools are attachable to machine the workpiece held by the second spindle, a product receiver provided on the second tool post, a Y2-axis motor capable of moving at least one of the second tool post and the second spindle in a Y2-axis direction, and an X2-axis motor capable of moving at least one of the second tool post and the second spindle in an X2-axis direction. The second tool post has a plurality of tool mounting parts where the tools are attachable. The tool mounting parts are aligned at intervals in the Y2-axis direction. At least one of the tool mounting parts is arranged in a position overlapping the product receiver with respect to the X2-axis direction.

Provided is a machine tool that makes it possible to prevent a reduction in accuracy of a lathe turning process. The machine tool holds a lathe turning tool by means of a tool holder attached to a main shaft and processes a workpiece placed on a rotating table with the lathe turning tool. The machine tool is provided with a fixing member (a gripping member, a pin, a plate) that comes into contact with the main shaft or the tool holder to inhibit rotation of the main shaft and the tool holder.

Provided is a machine tool that makes it possible to prevent a reduction in accuracy of a lathe turning process. The machine tool holds a lathe turning tool by means of a tool holder attached to a main shaft and processes a workpiece placed on a rotating table with the lathe turning tool. The machine tool is provided with a fixing member (a gripping member, a pin, a plate) that comes into contact with the main shaft or the tool holder to inhibit rotation of the main shaft and the tool holder.

The present invention provides a machine tool in which drops in lathe precision can be prevented and the angle of rotation of a lathe tool can be set. The machine tool comprises: a spindle head to which a spindle is provided: a tool holder which holds the lathe tool and is mounted on the spindle; a securing member, provided to the spindle head, for securing the lathe tool while allowing adjustment of the angle of rotation of the lathe tool: and an attachment member, provided to the tool holder, for attaching the lathe tool to the securing member at an adjusted angle of rotation, wherein the angle of rotation of the lathe tool is adjusted in accordance with where on the securing member the attachment member is attached.

The present invention provides a machine tool in which drops in lathe precision can be prevented and the angle of rotation of a lathe tool can be set. The machine tool comprises: a spindle head to which a spindle is provided: a tool holder which holds the lathe tool and is mounted on the spindle; a securing member, provided to the spindle head, for securing the lathe tool while allowing adjustment of the angle of rotation of the lathe tool: and an attachment member, provided to the tool holder, for attaching the lathe tool to the securing member at an adjusted angle of rotation, wherein the angle of rotation of the lathe tool is adjusted in accordance with where on the securing member the attachment member is attached.

A lathe includes a spindle rotatable on a spindle axis, a tool post to which a tool is attachable, an X1-axis ball screw extended in an X1-axis direction perpendicular to the spindle axis and capable of moving the tool post in the X1-axis direction, and an X1-axis support bearing provided on an end of the X1-axis ball screw with respect to the X1-axis direction to restrict movement of the X1-axis ball screw in the X1-axis direction. The tool post is provided with an X1-axis ball screw nut engaged with the X1-axis ball screw. The X1-axis ball screw nut is movable in the X1-axis direction according to rotation of the X1-axis ball screw. The direction that the X1-axis ball screw nut approaches the X1-axis support bearing faces the same direction as the direction that the tool cuts into the workpiece.

A lathe includes a spindle rotatable on a spindle axis, a tool post to which a tool is attachable, an X1-axis ball screw extended in an X1-axis direction perpendicular to the spindle axis and capable of moving the tool post in the X1-axis direction, and an X1-axis support bearing provided on an end of the X1-axis ball screw with respect to the X1-axis direction to restrict movement of the X1-axis ball screw in the X1-axis direction. The tool post is provided with an X1-axis ball screw nut engaged with the X1-axis ball screw. The X1-axis ball screw nut is movable in the X1-axis direction according to rotation of the X1-axis ball screw. The direction that the X1-axis ball screw nut approaches the X1-axis support bearing faces the same direction as the direction that the tool cuts into the workpiece.