Abstract: In a cam grinding method, a common surface of a first cam and a second cam is acquired in a common surface setting step. In a first common surface grinding step performed after a first cam grinding step, traverse movement of a grinding wheel is performed such that the grinding wheel is aligned with an area from the first cam to the second cam while the first cam and the second cam are rotated, and the common surface is ground. In a second common surface grinding step performed after a second cam grinding step, traverse movement of the grinding wheel is performed such that the grinding wheel is aligned with an area from the second cam to the first cam while the first cam and the second cam are rotated, and the common surface is ground.

Abstract: A cam grinding method includes: a common base circle portion setting step of obtaining an angular range of a common surface based on first cam lift data of a first cam and second cam lift data of a second cam; a first cam grinding step of grinding the first cam; a second cam grinding step of grinding the second cam; and a common base circle portion traverse grinding step of, after the second cam grinding step, moving a grinding wheel in a traverse direction to perform spark-out of an unground part remaining at the boundary between the first and second cams.

Abstract: A cam grinding method using a cam grinding device includes: an intermediate-cam lift-data generating step of, based on first lift data of a first cam and second lift data of a second cam, generating imaginary intermediate cam lift data of a spline curve that contains profiles of both cams; a first cam grinding step of grinding the first cam; a second cam grinding step of grinding the second cam; and an intermediate-cam grinding step of removing an unground portion generated at a boundary portion between the first cam and the second cam by plunge grinding or spark-out grinding on the basis of the intermediate-cam lift data after the second cam grinding step.

Abstract: In a cam grinding method, a common surface of a first cam and a second cam is acquired in a common surface setting step. In a first common surface grinding step performed after a first cam grinding step, traverse movement of a grinding wheel is performed such that the grinding wheel is aligned with an area from the first cam to the second cam while the first cam and the second cam are rotated, and the common surface is ground. In a second common surface grinding step performed after a second cam grinding step, traverse movement of the grinding wheel is performed such that the grinding wheel is aligned with an area from the second cam to the first cam while the first cam and the second cam are rotated, and the common surface is ground.

Abstract: A cam grinding method using a cam grinding device includes: an intermediate-cam lift-data generating step of, based on first lift data of a first cam and second lift data of a second cam, generating imaginary intermediate cam lift data of a spline curve that contains profiles of both cams; a first cam grinding step of grinding the first cam; a second cam grinding step of grinding the second cam; and an intermediate-cam grinding step of removing an unground portion generated at a boundary portion between the first cam and the second cam by plunge grinding or spark-out grinding on the basis of the intermediate-cam lift data after the second cam grinding step.

Abstract: A cam grinding method includes: a common base circle portion setting step of obtaining an angular range of a common surface based on first cam lift data of a first cam and second cam lift data of a second cam; a first cam grinding step of grinding the first cam; a second cam grinding step of grinding the second cam; and a common base circle portion traverse grinding step of, after the second cam grinding step, moving a grinding wheel in a traverse direction to perform spark-out of an unground part remaining at the boundary between the first and second cams.

Abstract: A machine tool a tool includes a supporting member relatively movable to a workpiece along a predetermined axis, a servo motor configured to drive the tool supporting member to the workpiece along the predetermined axis, a sizing sensor configured to measure a profile of the workpiece and to output a size deviation of measured values from a target profile, and a position detector configured to detect at least one of a relative position of the tool supporting member to the workpiece and a rotational position angle of the servo motor. The a servo driver is configured to drive the servo motor, and has a first feedback control having an output based on the size deviation, and a second feedback control based on an output of the position detector. The servo drives the servo motor by combining the outputs of the first and second feedback controls.

Abstract: It is one object of the present invention to provide a program writing method of numerical controller, a numerical controller and a cutting machine controlled thereby, achieving the writing of a plurality of programs relating to one axis to perform a high efficiency in a lot of productions. A next or later user-set-program controlling a duplicated axis controlled by plural user set programs identifies a virtual axis virtually controlled by one user set program. A program is written to replace the duplicated axis with the virtual axis. A control amount calculated by the user set program identifying the virtual axis is added to a control amount inputted to a correspondent axis driving program as a control amount of the duplicated axis before replacing the virtual axis.

Abstract: It is an object of the present invention to provide a machine tool which can execute to machine the workpiece more precisely. A CNC 60, a servo driver 33 and a monitoring sensor 50 are connected to same simultaneous communication network 70. One of the CNC 60, the servo driver 33 and the monitoring sensor 50 functions as a master to output a periodical reference signal, and two remaining ones of the CNC 60, the servo driver 33 and the monitoring sensor 50 function as a slave to be input the reference signal from the simultaneous communication network 70 and to execute own processes on a basis of the reference signal.

Abstract: It is an object of the present invention to provide a machine tool and a machining method thereof which can execute to machine the workpiece more precisely. The machine tool comprises a tool supporting member 21 relatively movable to a workpiece W along a predetermined axis and supporting a tool 40, a servo motor 32 driving the tool supporting member 21 to the workpiece W along the predetermined axis, a sizing sensor 50 measuring a profile of the workpiece W machined by the tool 40 and outputting a size deviation of measured values from a target profile, and a servo driver 33 driving the servo motor 32 in a feedback control based on the size deviation being output from the sizing sensor 50.

Abstract: It is one object of the present invention to provide a program writing method of numerical controller, a numerical controller and a cutting machine controlled thereby achieving to write a plurality of programs relating to one axis to perform a high efficiency in the small lot of productions. A next or later user-set-program controlling a duplicated axis controlled by plural user set programs identifies a virtual axis virtually controlled by own user set program, a program is written to replace the duplicated axis to the virtual axis. A control amount calculated by the user set program identifying the virtual axis is added to a control amount input to a correspondent axis driving program as a control amount of duplicated axis before replacing to the virtual axis.

Abstract: A profile data compensating method comprises a step of generating effective profile data by operating a machine tool under a non-load condition in accordance with theoretical profile data, a step of generating first error profile data representing error components of a control system, a step of generating first compensated profile data based upon the first error profile data, a step of generating measured profile data by measuring the shape of the workpiece machined in accordance with the first compensated profile data, a step of generating second error profile data representing error components of a mechanical system, and a step of generating second compensated profile data based upon the first and second error profile data.

Abstract: A profile data compensating method comprises a step of generating effective profile data by operating a machine tool under a non-load condition in accordance with theoretical profile data, a step of generating first error profile data representing error components of a control system, a step of generating first compensated profile data based upon the first error profile data, a step of generating measured profile data by measuring the shape of the workpiece machined in accordance with the first compensated profile data, a step of generating second error profile data representing error components of a mechanical system, and a step of generating second compensated profile data based upon the first and second error profile data.

Abstract: An apparatus for detecting a residual grinding amount includes first and second feelers adapted to contact the peripheral surface of a workpiece such that they move, in accordance with a variation in the diameter of the workpiece, in opposite directions each perpendicular to the direction of deflection of the workpiece, and a first displacement detector for detecting relative displacement between the first and second feelers. The apparatus also includes a third feeler adapted to contact the peripheral surface of the workpiece such that it moves, in accordance with the variation in the diameter of the workpiece as well as a variation in the deflection of the workpiece, in the direction of deflection of the workpiece, and a second displacement detector for detecting displacement of the third feeler. The residual grinding amount is calculated based on the displacements detected by the first and second displacement detectors.

Abstract: In a method and apparatus for grinding a workpiece, a rotating workpiece and a rotating grinding wheel are relatively moved toward and away from each other, and at least first and second grinding steps are performed at high and low infeed rates, respectively. Further, back-off grinding is performed between the first and second grinding steps. A target workpiece diameter to be obtained at the end of the back-off grinding is first provided. During the rough grinding, prediction is repeatedly performed to obtain a workpiece diameter which would be obtained at the end of the back-off grinding if the back-off grinding were started instantaneously. The workpiece diameter is predicted taking account of a delay in the movement of the grinding wheel. The back-off grinding is started when it is judged that the predicted workpiece diameter becomes equal to the target workpiece diameter.