Abstract: In three-dimensional laminating and shaping, a three-dimensional laminated and shaped object having a corner portion is accurately shaped. A three-dimensional laminating and shaping apparatus includes a material supplier that supplies a material of a three-dimensional laminated and shaped object onto a shaping table, a light beam irradiator that performs irradiation of a light beam, a controller that controls a scanning direction and scanning speed of the light beam, a shaping model acquirer that acquires a shaping model of the three-dimensional laminated and shaped object, a shaping route decider that decides shaping routes based on the acquired shaping model, an extractor that extracts, from the decided shaping routes, a start point and end point of the shaping routes and a relay point at which a direction of the shaping route changes, and an additional route decider that decides additional routes for at least one of the extracted start point, end point, and relay point.

Abstract: An NC controller determines a subsequent point sequence position in each sampling by interpolation calculation with a section between a corner cutting starting point and a corner cutting end point as a machined section. The NC controller then internally calculates a spindle rotating angle in a coordinate position where an outer end of a cutting edge is positioned at the subsequent point sequence position. Based on the spindle rotating angle and the substantial diameter of the rotary tool, the NC controller internally calculates coordinate values of the spindle at the subsequent point sequence position. Based on the coordinate values of the spindle, the rotary tool and a workpiece are relatively shifted on a plane parallel to the bottom surface of the tool while the spindle rotation is controlled in synchronization with the shifting, thereby cutting the corner.

Abstract: A numerically controlled machine tool comprises a work holding unit for holding a workpiece, and a tool capable of being moved along the Z-axis into a central bore formed in the workpiece. The tool has a shank and a cutting chip attached to the shank so as to project laterally from the shank. A driving mechanism controlled by a control unit moves the tool along a substantially circular path in an X-Y plane so that the cutting chip moves in a direction substantially coinciding with a tangent to the internal surface of the central bore of the workpiece at the point of contact of the cutting chip with the internal surface of the central bore.

Abstract: For an orbital machining in which a spindle having a cutting tool attached thereto and a work to be machined are moved, by feed shaft control, to make a relative displacement to each other along a plane perpendicular to an axis of rotation of the spindle, such that a mutual interpolation motion is achieved between the spindle and the work, and a rotation angle of the spindle is controlled quantitatively and synchronously to have a predetermined correlation to the shaft control so that, at any angular position in rotation of the spindle, a blade direction of the cutting tool is maintained in a preset direction to thereby achieve a cutting into a configuration to be defined by an interpolation locus based on the mutual interpolation motion, there is effected a combination of feed-forward compensation for a follow-up delay in control of a motor servo system of a respective feed shaft and for a follow-up delay in control of a motor servo system of the spindle.

Abstract: A tool T is mounted to the tip of the rotatable main shaft S, and at least the rotation angle of the main shaft S is controlled so that the edge of the tool T is always maintained at the right angle against the direction of the tool movement on the machining program locus, when a work W is machined with the edge T.sub.A of the tool T in the state that the edge T.sub.A of the tool T is offset from the rotation center S.sub.0 of the main shaft S.