Abstract: A cutting method capable of efficiently removing cutting chips around a cutting point with a little electric power, and cutting a work with high accuracy with a ball end mill. The ball end mill has a slit shaped-opening part at a portion adjacent to a rake face of a cutting edge in internal communication with a suction passage, and a work in which a cutting liquid is previously coated on an inclined face of the work is cut while the cutting liquid is sucked in the area around the cutting edge from the opening part through the suction passage. As a result of this, the cutting liquid in the area around the cutting edge is sucked from the opening part and a cutting power decreasing rate is higher than in a case where the suction is not carried out.

Abstract: To provide a method to carry out complicated surface machining such as graining or the like without decreasing machining accuracy and machining efficiency. In a machine tool including a main spindle head capable of relatively moving in three perpendicular directions with respect to a workpiece and an additional spindle being provided at the main spindle head and capable of moving in a Z spindle direction, while the main spindle head relatively moves with respect to a working surface S of the workpiece along a smoothly curved surface R which is smoothed so as to be restricted within the movement distance in the moving direction of the additional spindle, the additional spindle moves by a difference between the working surface S and the smoothly curved surface R, and makes a tool T to machine the working surface S.

Abstract: A method for controlling deflection caused in a structural member when a force is applied to the structural member is described. The method includes a step of generating rotation torque in the structural member in such a direction as to cancel out the force applied to the structural member. The rotation torque is generated by a motor and a load inertia applying device such as a disc connected to the rotor. A stator of the motor is connected to the structural member and the load inertia applying device applies load inertia to a rotor of the motor.

Abstract: An object is to provide a cutting method capable of efficiently removing cutting chips around a cutting point with a little electric power, and cutting a work with high accuracy. A ball end mill having a slit shaped-opening part at a portion adjacent to a rake face of a cutting edge and internally having a suction passage is used, and a work in which a cutting liquid is previously coated on an inclined face is cut while the cutting liquid is sucked in the area around the cutting edge from the opening part through the suction passage. As a result of this, in case of using non water-miscible cutting oil, when the cutting liquid in the area around the cutting edge is sucked from the opening part, a cutting power decreasing rate is higher than a case where the suction is not carried out.

Abstract: To provide a method to carry out complicated surface machining such as graining or the like without decreasing machining accuracy and machining efficiency. In a machine tool including a main spindle head capable of relatively moving in three perpendicular directions with respect to a workpiece and an additional spindle being provided at the main spindle head and capable of moving in a Z spindle direction, while the main spindle head relatively moves with respect to a working surface S of the workpiece along a smoothly curved surface R which is smoothed so as to be restricted within the movement distance in the moving direction of the additional spindle, the additional spindle moves by a difference between the working surface S and the smoothly curved surface R, and makes a tool T to machine the working surface S.

Abstract: With respect to two or more NC data points among a group of dots together representing a tool locus, a curvature radius of the tool locus is determined. Then, the NC data point and its succession with other points is displayed in a display color determined according to the magnitude of the curvature radius. Alternatively, a movement direction of each minute segment relative to a specific axis selected from the three (XYZ) axes is determined as either positive, negative, or zero, and the minute segment or an end point thereof is display with the display property determined according to the movement direction. Still alternatively, after a specific axis is selected from the three (XYZ) axes, a region relative to the selected region is divided along the selected axis, for predetermined dividing width, first beginning with a predetermined reference point, and the resultant divided regions are given predetermined display properties.

Abstract: With respect to two or more NC data points among a group of dots together representing a tool locus, a curvature radius of the tool locus is determined. Then, the NC data point and its succession with other points is displayed in a display color determined according to the magnitude of the curvature radius. Alternatively, a movement direction of each minute segment relative to a specific axis selected from the three (XYZ) axes is determined as either positive, negative, or zero, and the minute segment or an end point thereof is display with the display property determined according to the movement direction. Still alternatively, after a specific axis is selected from the three (XYZ) axes, a region relative to the selected region is divided along the selected axis, for predetermined dividing width, first beginning with a predetermined reference point, and the resultant divided regions are given predetermined display properties.

Abstract: A method of automatically measuring sphericity of a ball end mill on a machining device under nearly identical conditions to those at the time of machining. Under a cross rail 1 of the machining device, a laser measuring device (6) is placed through a mount (7) so that a laser optical axis "a" is in the X-axis direction. A ball end mill T is fixed through a milling chuck (5) to a main spindle (4) carried rotatably by a main spindle ram (3) that can be positioned along the Z-axis direction of a main spindle head 2, which can itself be positioned in the Y-axis direction. While rotating, the tip of ball end mill T is set using laser beams. A position shifted by one radius of a tool from the tip is set as the ball center. One radius of a cutting face is measured by sliding the ball end mill on the nominal of the ball per an arbitrary angle within 90.degree.. The sphericity of the ball end mill T is obtained from the respective one radius at each angle.

Abstract: The method for automatically correcting deflection of a stylus in a digitizing device enables correction of the displacement of the stylus. The coefficient of deflection correction is calculated by utilizing the fact that the displacement and deflection of the stylus are both in proportion to the contact pressure between the stylus and a three-dimensional model.

Abstract: The tool feed rate correcting method for numerical control system and the apparatus therefor according to this invention correct the feed override values using an override correction coefficient which is calculated from the displacement information of the tool and control the tool feed rate so that machining loads can be maintained within predetermined range irrespective of the machining conditions. This invention is therefore effective in realizing machining with a high efficiency as well as in reducing the cost.