The present invention provides a lathe having a speeder device to increase the speed of a workpiece to be worked on by the lathe as compared to the speed of a workpiece to be worked on by the lathe without the use of the speeder device. The speeder device includes a torque arm, a means for stopping rotation of the torque arm, a planetary gearset assembly, an output spindle assembly, and a collet assembly. The means for stopping rotation of the torque rod is secured to a first end of the torque rod and the planetary gearset assembly is operatively connected to a second end of the torque rod. The output assembly is operatively connected to the planetary gear assembly, and the collet assembly holds the workpiece and is operatively connected to the spindle assembly.

The present invention provides a lathe having a speeder device to increase the speed of a workpiece to be worked on by the lathe as compared to the speed of a workpiece to be worked on by the lathe without the use of the speeder device. The speeder device includes a torque arm, a means for stopping rotation of the torque arm, a planetary gearset assembly, an output spindle assembly, and a collet assembly. The means for stopping rotation of the torque rod is secured to a first end of the torque rod and the planetary gearset assembly is operatively connected to a second end of the torque rod. The output assembly is operatively connected to the planetary gear assembly, and the collet assembly holds the workpiece and is operatively connected to the spindle assembly.

A bar material supplying device includes a feed rod having a leading end provided with a finger chuck, a feed rod servomotor and an air cylinder device that move the feed rod in a longitudinal direction to insert and pull the bar material into and from the finger chuck, and an NC device that controls driving of the feed rod servomotor and driving of the air cylinder device. The NC device controls the driving of the feed rod servomotor and the driving of the air cylinder device to move the feed rod in an operation of inserting and pulling the bar material into and from the finger chuck, and operates as an error allowable device that allows an error of an operation amount of the feed rod servomotor motor in the operation of inserting and pulling the bar material into and from the finger chuck.

A bar material supplying device includes a feed rod having a leading end provided with a finger chuck, a feed rod servomotor and an air cylinder device that move the feed rod in a longitudinal direction to insert and pull the bar material into and from the finger chuck, and an NC device that controls driving of the feed rod servomotor and driving of the air cylinder device. The NC device controls the driving of the feed rod servomotor and the driving of the air cylinder device to move the feed rod in an operation of inserting and pulling the bar material into and from the finger chuck, and operates as an error allowable device that allows an error of an operation amount of the feed rod servomotor motor in the operation of inserting and pulling the bar material into and from the finger chuck.

A numerical control device for a machine tool, the machine tool including: a reference shaft that moves a tool or a workpiece; and a superimposition shaft that moves a tool or the workpiece. The numerical control device superimposes the movement amount of the reference shaft on the movement amount of the superimposition shaft. The numerical control device including a control computation unit that, in response to a superimposition control command, changes at least one of a first vibration rate, a second vibration rate, and a main shaft rotation speed on a basis of a first vibration command, a second vibration command and a main shaft rotation speed command such that the first vibration rate stays constant and the second vibration rate stays constant. The first vibration rate is a number of times that of the reference shaft vibrates per rotation of a main shaft.

A numerical control device for a machine tool, the machine tool including: a reference shaft that moves a tool or a workpiece; and a superimposition shaft that moves a tool or the workpiece. The numerical control device superimposes the movement amount of the reference shaft on the movement amount of the superimposition shaft. The numerical control device including a control computation unit that, in response to a superimposition control command, changes at least one of a first vibration rate, a second vibration rate, and a main shaft rotation speed on a basis of a first vibration command, a second vibration command and a main shaft rotation speed command such that the first vibration rate stays constant and the second vibration rate stays constant. The first vibration rate is a number of times that of the reference shaft vibrates per rotation of a main shaft.

The present invention provides a lathe having a speeder device to increase the speed of a workpiece to be worked on by the lathe as compared to the speed of a workpiece to be worked on by the lathe without the use of the speeder device. The speeder device includes a torque arm, a means for stopping rotation of the torque arm, a planetary gearset assembly, an output spindle assembly, and a collet assembly. The means for stopping rotation of the torque rod is secured to a first end of the torque rod and the planetary gearset assembly is operatively connected to a second end of the torque rod. The output assembly is operatively connected to the planetary gear assembly, and the collet assembly holds the workpiece and is operatively connected to the spindle assembly.

The present invention provides a lathe having a speeder device to increase the speed of a workpiece to be worked on by the lathe as compared to the speed of a workpiece to be worked on by the lathe without the use of the speeder device. The speeder device includes a torque arm, a means for stopping rotation of the torque arm, a planetary gearset assembly, an output spindle assembly, and a collet assembly. The means for stopping rotation of the torque rod is secured to a first end of the torque rod and the planetary gearset assembly is operatively connected to a second end of the torque rod. The output assembly is operatively connected to the planetary gear assembly, and the collet assembly holds the workpiece and is operatively connected to the spindle assembly.

A numerical control device for a machine tool, the machine tool including: a reference shaft that moves a tool or a workpiece; and a superimposition shaft that moves a tool or the workpiece. The numerical control device superimposes the movement amount of the reference shaft on the movement amount of the superimposition shaft. The numerical control device including a control computation unit that, in response to a superimposition control command, changes at least one of a first vibration rate, a second vibration rate, and a main shaft rotation speed on a basis of a first vibration command, a second vibration command and a main shaft rotation speed command such that the first vibration rate stays constant and the second vibration rate stays constant. The first vibration rate is a number of times that of the reference shaft vibrates per rotation of a main shaft.

A numerical control device for a machine tool, the machine tool including: a reference shaft that moves a tool or a workpiece; and a superimposition shaft that moves a tool or the workpiece. The numerical control device superimposes the movement amount of the reference shaft on the movement amount of the superimposition shaft. The numerical control device including a control computation unit that, in response to a superimposition control command, changes at least one of a first vibration rate, a second vibration rate, and a main shaft rotation speed on a basis of a first vibration command, a second vibration command and a main shaft rotation speed command such that the first vibration rate stays constant and the second vibration rate stays constant. The first vibration rate is a number of times that of the reference shaft vibrates per rotation of a main shaft.