An indexing tool for positioning a workpiece, the tool comprising a block having sides, the sides defining a regular polygon. The block has a central opening, and a threaded hole extending at a right angle to the central opening and into and through one of the sides. The block also has a V notch in the block wall opposite the threaded hole, the threaded hole being adapted to have received therein a like threaded set screw.

A control device generates, for each command cycle on the basis of machining line information expressing a plane machining line with a function displayed by a prescribed parameter and tangential line information showing a tangential line direction at respective positions of the machining line, a position command on a rotational axis and two linear axes with a position on the machining line obtained when the parameter is changed by a prescribed amount set as a machining position. The position command generated by the control device includes a command on a position of the rotational axis at which the tangential line at the machining position forms a prescribed angle set in advance with respect to any one of the linear axes and a command on the position of the two linear axes at which a tool is set at the machining position when the rotational axis is located at the position of the rotational axis.

A control device generates, for each command cycle on the basis of machining line information expressing a plane machining line with a function displayed by a prescribed parameter and tangential line information showing a tangential line direction at respective positions of the machining line, a position command on a rotational axis and two linear axes with a position on the machining line obtained when the parameter is changed by a prescribed amount set as a machining position. The position command generated by the control device includes a command on a position of the rotational axis at which the tangential line at the machining position forms a prescribed angle set in advance with respect to any one of the linear axes and a command on the position of the two linear axes at which a tool is set at the machining position when the rotational axis is located at the position of the rotational axis.

A method and device for controlling the feed rate of a saw blade which is provided with teeth and rotates about a center point relative to a workpiece during a machining process. During a rotation of the saw blade about the center point, the feed rate is selected differently during a machining process effected by teeth of different sectors of the saw blade, wherein the feed rate is selected to be lower during a machining process effected by teeth of sectors having larger radial spacing of the teeth from the center point than during a machining process effected by teeth of sectors having smaller radial spacing of the teeth from the center point. In this way, the operation of the saw blade can be optimized and the service life can be increased.

A controller includes a reference-sphere position obtaining unit that obtains coordinate values, on three linear axes, of a reference sphere placed on a table. The coordinate values are measured by controlling the three linear axes while a target rotation axis for which rotation axis center position is to be measured is positioned at three or more locations. The controller includes a rotation-axis commanded-angle obtaining unit that obtains commanded angles given to the target rotation axis during obtainment of a position of the reference sphere. The controller includes an approximate circle calculating unit that calculates an approximate circle passing near the coordinate values of the reference sphere on the three linear axes under a constraint of the commanded angles. The controller includes a rotation axis position storage unit that stores a center position of the approximate circle as coordinates of a center position of the target rotation axis.

In order to provide a tool changer that can detect an entry of a foreign substance into a turret mechanism portion or wear of a turret mechanism part, a tool changer of the present invention includes a reference phase false detection sensing portion that monitors load variations which occur in a turret drive source and detects an entry of a foreign substance into the turret mechanism portion based on a difference between the load variations and a reference load used as a reference. Moreover, the reference phase false detection sensing portion can also detect the progress of wear of the turret mechanism part based on the integral of the absolute value of a difference between the load variations which occur in the turret drive source and the reference load used as a reference.

In order to provide a tool changer that can detect an entry of a foreign substance into a turret mechanism portion or wear of a turret mechanism part, a tool changer of the present invention includes a reference phase false detection sensing portion that monitors load variations which occur in a turret drive source and detects an entry of a foreign substance into the turret mechanism portion based on a difference between the load variations and a reference load used as a reference. Moreover, the reference phase false detection sensing portion can also detect the progress of wear of the turret mechanism part based on the integral of the absolute value of a difference between the load variations which occur in the turret drive source and the reference load used as a reference.

A first speed and a second speed slower than the first speed are set as a contact speed when a work w and a detection jig t attached to a tool post are brought into contact with each other to detect a position or a posture of the work w, the work and the detection jig are brought into contact with each other at the first speed, the detection jig and the work contacting each other are separated from each other by a predetermined distance, the work and the detection jig which are separated from each other are brought into contact with each other at the same position at the second speed, and a correction value is obtained based on a tool post position or a spindle angle during the second contact.

A first speed and a second speed slower than the first speed are set as a contact speed when a work w and a detection jig t attached to a tool post are brought into contact with each other to detect a position or a posture of the work w, the work and the detection jig are brought into contact with each other at the first speed, the detection jig and the work contacting each other are separated from each other by a predetermined distance, the work and the detection jig which are separated from each other are brought into contact with each other at the same position at the second speed, and a correction value is obtained based on a tool post position or a spindle angle during the second contact.

A spindle phase indexing device for a machine tool is equipped with a guide rail detachably or fixedly attached to a table, a phase indexing jig configured to travel on the guide rail and which includes a first fitting part, a cutting tool including a second fitting part configured to be fitted with the first fitting part, and a controller configured to store therein a phase of a spindle at a point in time when the first fitting part and the second fitting part are fitted together. The first fitting part and the second fitting part are formed such that rotation of the cutting tool is constrained when the first fitting part and the second fitting part are fitted together.