Abstract: A system for assuring that a rotation brake has engaged on a directional drilling machine. A pump-powered motor drives rotation of a spindle on the machine. The spindle is in turn attached to the above-ground end of a drill string. After the rotation brake is actuated, a controller causes the motor to transmit oppositely-directed rotational pulses to the spindle. If the brake is properly engaged, the pulses will produce spikes in pressure within the hydraulic circuit that powers the pump. When a pressure sensor detects such spikes, it signals the controller and confirms that the brake is engaged.

Abstract: The present invention relates to a machine tool including a ram spindle and a tool holder, and provides a machine tool comprising: a tool holder including at least two inserts; and a ram spindle capable of fixing the tool holder in a clamped state or rotating the tool holder in order to change the position of the insert, such that the position of the insert can be quickly changed, thereby enabling an improvement in productivity and precision and a reduction in product costs.

Abstract: In order to improve a lathe includes a machine frame, a workpiece spindle unit arranged on the machine frame and having a workpiece spindle housing and a workpiece spindle rotatingly drivable about a workpiece spindle axis in the workpiece spindle housing. A supporting unit which is arranged on the machine frame and in which a workpiece receptacle rotatable about the workpiece spindle axis can be supported on the machine frame radially to the workpiece spindle axis, in such a manner that rotary machining operations other than longitudinal turning are possible in a simple manner. It is suggested that the supporting unit have a bearing member receptacle, in which a guide bushing for longitudinal turning can be supported in the area of its workpiece receptacle in a longitudinal turning version of the lathe and the workpiece spindle unit can be supported in the area of its workpiece receptacle radially to the workpiece spindle axis in a short turning version of the lathe.

Abstract: In a combination machining lathe, a workpiece holding device holds a workpiece in a manner that permits the workpiece to rotate around an axis parallel to a direction of a horizontal Z axis. A tool post holds a tool that comprises a holder and a bit. The tool held by the tool post is indexed to a position in which the longitudinal axis of the holder is parallel to an X axis direction. The bit of the tool held by the tool post is angled such that a longitudinal axis of the bit is disposed in a position tilted away from the X axis direction closer to a horizontal axis in a plane containing the X axis and the Y axis. A turning operation is performed while the tool and/or the workpiece are moved relative to each other in a direction of the longitudinal axis of the bit.

Abstract: The present invention relates to a tool carrier 62 for a machine tool, in particular a lathe, having a rotary shaft drive for a numerically controllable rotary shaft B for rotating the tool carrier 62, a first tool turret head 62A carrying tools, rotatably mounted around a first turret axis, and a second tool turret head 62B carrying tools, rotatably mounted around a second turret axis, the first tool turret head 62A and the second tool turret head 62B being positioned on opposite sides of the tool carrier 62 with respect to the axis of rotation of the rotary shaft B. The present invention also relates to a machine tool, in particular a lathe, having a tool carrier 62 of this type.

Abstract: To provide a coolant supply structure for a turret tool rest in which the central part of the intermediate shaft can be utilized effectively as a space and there is no need to allow this shaft to be hollow when a shaft such as a driving shaft is inserted. In a coolant supply structure for a turret tool rest to supply a coolant to a tool mounting part of a turret 12, which is provided in a turret tool rest 1 having a turret 12 with a tool T being mounted thereon, a hollow rotating shaft 15 for rotating the turret 12 and a hollow intermediate shaft 19 arranged within the rotating shaft 15, wherein the coolant supply structure has a cylindrical member 23 inserted into the intermediate shaft 19, and a space served as a passage 24 of the coolant is formed between the cylindrical member 23 and the intermediate shaft 19.

Abstract: An automatic rotating turret device for work machinery is provided, in which a lift turret is not used. The turret device is provided with an axial-direction slide body, which is advanced or retracted in the direction of the axis of rotation of the turret by the drive device advancing or retracting the drive body in a direction orthogonal to the direction of rotation axis; and a clutch device that is engaged or disengaged by the axial-direction slide body being advanced or retracted, the turret being of a non-lift-type, and there being provided to the drive body a tapering action part for generating an expanding action caused by the movement of the drive body and pressingly sliding the axial-direction slide body against the turret stage.

Abstract: It is intended to provide an NC lathe which can increase the number of tools to be exchanged. A turret 1 and an additional turret 2 are combined with each other. The turret 1 has a plurality of mounting positions. The additional turret 2 is supported at one of the mounting positions. The additional turret 2 has a plurality of additional mounting positions. Tools 4 are mounted at the additional mounting positions, a work 4 being held by the chuck 8.

Abstract: A tool revolver unit for a machine tool for machining workpieces has a housing (1) and a tool drive rotatable relative to the housing about an axis (3), has a rotary drive (13, 15) for a rotational motion of the tool disk, and has another rotary drive (19, 23). The other rotary drive (19, 23) is a servomotor for controlling a locking device (5, 31, 37) enabling a releasable rotary lock between the housing (3) and the tool disk.

Abstract: A machine tool includes: a main spindle adapted to be rotatable with a workpiece chucked thereby; a tool spindle capable of moving in directions of three axes perpendicular to each other and capable of pivoting about one of the axes, the axis being perpendicular to the main spindle; an automatic tool changer adapted to detachably attach a first tool and a chucking unit to the tool spindle, the first tool being used for machining the workpiece chucked by the main spindle, the chucking unit being used for chucking the workpiece; and a tool post having a second tool mounted thereon, the second tool being used for machining the workpiece chucked by the chucking unit attached to the tool spindle.

Abstract: A carriage is moved in a direction including a Y axis component in order to move a turning process tool that is attached to a tool spindle along a horizontal line that is perpendicular to a Z axis, and thus, a turning process is carried out on a workpiece which is attached to a workpiece spindle.

Abstract: Computer numerically controlled (CNC) machines, adjustable material-working tools, and methods of operating an adjustable tool with a CNC machine are presented herein. An adjustable tool for a material-working machine is disclosed. The adjustable tool includes an elongated housing, and one or more cutting inserts at least partially disposed within the housing. Each cutting insert is selectively transversely repositionable with respect to the housing. A wedge is selectively longitudinally repositionable with respect to the housing. The wedge mates with the cutting insert(s) such that longitudinal movement of the wedge effectuates transverse movement of the cutting insert(s). A control arm is movably mounted to the housing. The control arm is configured to mechanically couple the wedge to a prime mover of the material-working machine such that motive force is transferred from the prime mover through the control arm to the wedge for the selective repositioning thereof.

Abstract: In order to improve a machine tool comprising a first spindle for accommodating a workpiece and a first carrier for machining units movable along an X axis, which can be moved relative to one another along a Z axis, a second carrier which is movable along an X axis and with which machining units can be moved into or out of a functional position associated with the first spindle in a transverse direction extending transversely to the X axis and transversely to the Z axis, as well as an additional carrier for machining units in such a manner that it offers optimum possibilities for the machining of a front side of a workpiece and a rear side of a workpiece, it is suggested that the second carrier bear a second spindle, that as a result of movement of the second carrier the second spindle be movable in the direction of the Z axis and the transverse direction between a workpiece takeover position and at least one workpiece machining position and that the additional machining units be arranged in a spatial area, i

Abstract: Disclosed in one embodiment is a computer numerically controlled machine having a coolant nozzle that is mounted on a turret of the machine and that is rotatable relative to the turret under the control of a computer control system. The nozzle is fluidically connected to a source of a coolant. The machine includes a computer control system that is operatively coupled to the various components of the machine including the nozzle. In some embodiments, the nozzle may be moved to cause a constant contact angle with respect to one of said tool and said workpiece. In other embodiments, the nozzle may be moved to cause a constant coolant time to interface. Also disclosed are related methods.

Abstract: It is an object of the present invention to provide a hydraulic-free automatic swiveling turret apparatus which can easily ensure a swiveling function that is smooth and superior in terms of durability using a simple construction without any need to install a hydraulic pressure reducing mechanism requiring complicated design and control.

Abstract: Rotary transmission leadthrough with: a shaft (3) able to turn about a longitudinal axis running in the longitudinal direction (L) with at least one longitudinal borehole (26, 27, 28) running in the longitudinal direction (L), in which a push rod (43, 44, 45) is arranged and can move back and forth relative to the shaft (3) in the longitudinal direction (L), and with at least one opening (22, 23) in a lateral wall of the shaft which extends to a coordinated longitudinal borehole (26, 27, 28) and at least one push fork (12, 13, 14) which can travel in the longitudinal direction (L) outside the shaft (3) and is coordinated with one of the push rods (43, 44, 45), and an active connection running through the coordinated opening (22, 23) to the coordinated longitudinal borehole (26, 27, 28) between the coordinated push fork (12, 13, 14) and the coordinated push rod (43, 44, 45), which transmits a back and forth motion of the coordinated push fork (12, 13, 14) relative to the shaft (3) onto the coordinated push rod

Abstract: In a combination machining lathe, a workpiece holding device holds a workpiece in a manner that permits the workpiece to rotate around an axis parallel to a direction of a horizontal Z axis. A tool post holds a tool that comprises a holder and a bit. The tool held by the tool post is indexed to a position in which the longitudinal axis of the holder is parallel to an X axis direction. The bit of the tool held by the tool post is angled such that a longitudinal axis of the bit is disposed in a position tilted away from the X axis direction closer to a horizontal axis in a plane containing the X axis and the Y axis. A turning operation is performed while the tool and/or the workpiece are moved relative to each other in a direction of the longitudinal axis of the bit.

Abstract: In order to improve a machine tool for machining a workpiece by a relative movement between the workpiece and a tool, comprising a first receiving device for the workpiece or the tool, a compound slide system with a second receiving device for the tool or the workpiece and comprising a drive device for moving the second receiving device in relation to the first receiving device, which drive device acts at least two spaced-apart points of application by at least three drive struts extending parallel to at least two different directions and each with a pivot joint, and with which drive device the at least two points of application can be positioned by means of the at least three drive struts, in such a way that exact positioning of the second slide element can be achieved by structural measures, it is proposed that four drive struts of invariant length, each with a pivot joint, act on the slide element, each of which struts is pivotally connected to a guiding slide, which is guided in a linearly movable manner

Abstract: The invention provides a composite working lathe capable of improving the efficiency of workpiece machining area by arranging a workpiece handling device below a spindle of the composite working lathe. The composite working lathe 1 comprises a spindle 20 and a tool spindle 30 on a bed 10. A workpiece handling device 40 arranged below the spindle 20 can be moved along a W axis parallel to the axis line C1 of the spindle. The workpiece handling device 40 has a workpiece handling head 50 that pivots in the direction of arrow F around an axis line C2, and grips the workpiece K1 via a gripper 60. The axis line C2 is an axis perpendicular to the vertical plane including the axis line C1 of the spindle 20, and the workpiece handling head 50 is raised for 90 degrees when the gripper 60 receives the workpiece K1 from the spindle 20. The angular position of the workpiece handling head 50 is allocated and the workpiece K1 is machined via a tool T1 on the tool spindle 30.

Abstract: A rotational power servo toolpost includes a plurality of rotational tool holders, which can freely rotate 360 degrees, to cut a workpiece from various angles. The rotational power servo toolpost has a turret base, a turret, tool holders mounted on a side surface of the turret and having a variety of needed tools, a tool-holder-rotating device, and a tool-rotating device. When the tool holder with the needed tool rotates along with the turret to the preset area, a servo motor of the tool-holder-rotating device drives the related members to freely rotate the tool holder around 360 degrees according to the machining requirements. The tool-driving device then drives the tool, thereby cutting the workpiece from various angles.

Abstract: Equipment for mechanical machining, especially the turning and drilling of mechanical workpieces, such as light alloy wheels and the like, includes at least one turning unit with a double chuck to support the workpieces being machined and a turning head designed to work in association with one or other of the chucks alternately. At least one first workpiece loading/unloading device can be used for moving the workpieces being machined on one or other of the chucks so as to bring about loading/unloading of the workpieces from one of the chucks at the same time as mechanical machining is being carried out on the other chuck. The equipment further includes at least one drilling unit operatively associated with the turning unit and including at least one first drilling head combined with at least one corresponding first workpiece-holding device and at least one second device for loading/unloading parts to move parts being machined in the drilling unit.

Abstract: A method of optimizing the tool selecting operation of a turret according to the contents of a machining program in a turret tool rest allowing a rotating tool to be fitted thereto, including a step (101) for determining whether the rotating tool is contained in various types of tools fitted to the turret, a step (102) for, when the rotating tool is contained, selecting whether the phase of the rotating motion of the rotating tool fitted to the turret is adjusted to be identical in each time the rotating tool is disposed at an indexing position, a step (103) for, when the phase of the rotating motion of the rotating tool is adjusted to be identical, performing a “less than one rotation control” in which the cumulative sum of the turning indexing motion of the turret in a same turning direction is less than one rotation, and a step (104) for, when the rotating tool is not contained in the fitted tools or the adjustment of the phase of the rotating motion is not performed even if the rotating tool is contained

Abstract: A modular base plate system is for use with a CNC machine for holding workpieces during manufacturing. The system includes a “turret-style” base plate having a plurality of stations positioned around the side of the base plate. Each station comprises a U-shaped pocket machined or otherwise formed in the base plate sidewall. The base plate system further includes a number of fixture blocks that fit in the pockets, with each block having a holder for holding workpieces. In operation, workpieces are attached to the fixture blocks, the fixture blocks are inserted into the pockets, and the fixture blocks are removably secured to the base plate. Then, the base plate is affixed to a CNC machine in a standard manner, e.g., using a pallet or rotary table or the like. In this manner, machining operations can be performed on a number of parts in sequence before any part changeover is required.

Abstract: A turret lathe includes a bed, a headstock mounted on the bed, a first slide mounted slidably on the bed, a second slide mounted slidably on the first slide, a spindle journalled to the headstock, a chuck mounted on the spindle, a tailstock mounted on the second slide, a driven shaft journalled to the tailstock, a turret mounted on the driven shaft, a transmission unit, and a clutch operable between a chamfering operation mode, in which the driven shaft is connected to the spindle through the transmission unit, and a turning operation mode, in which the driven shaft is disconnected from the spindle.

Abstract: A cutting tool is disposed on a turret. The cutting tool includes: a holder having a peak end, and a throw-away insert clamped to the peak end of the holder with a clamp screw. The holder has a bottom face and a peak end face defining a corner of the holder. The corner of the holder forms a chamfered face. The throw-away insert has a bottom face and a relief face defining a corner of the throw-away insert. The corner of the throw-away insert forms a chamfered face. The chamfered face of the corner of the holder and the chamfered face of the corner of the throw-away insert prevent the cutting tools adjacent to each other from causing an interference with each other when the cutting tools are at least one of in a standby position and in a machining operation.

Abstract: In order to improve a machine tool comprising a tool carrier with a tool carrier head which is mounted for rotation about an axis and has a support member with a plurality of tool receiving means, into which drivable tool units can be inserted such that gear wheels for driving all the tool units insertable into the tool receiving means are arranged and can be moved in an interior of the support member on an orbital path extending around the axis, in such a manner that some of the tool units can be driven selectively, it is suggested that a drive wheel be rotatable about a drive axis which is arranged non-coaxially in relation to the axis, that teeth of the drive wheel move on a flight path which extends such that in a drive section of the orbital path the distances between this and the flight path have the lowest values and are greater in all the other sections of the orbital path and that the teeth be in drive engagement with a gear wheel located in the drive section and extend without contact in relation to

Abstract: A multiple spindle bar machine (10) includes in its preferred embodiment three main spindles (66) that are opposed by three counterspindles (106) of substantially identical construction. The main spindles (66) can be indexed about the Z axis. The counterspindles (106) cannot be indexed, but they can translate along the Z-axis. Each main spindle (66) is hollow and contains a workpiece-grasping collet chuck (68). At least one of the counterspindles (106) contains a workpiece-grasping collet chuck (108). The main spindles (66) are rotated in unison, but the counterspindles (106) are rotated independently by computer-controlled motors. In the preferred embodiment, three tool-carrying turrets (20A, 20B, 20C) are radially spaced around the machine at three work stations. Preferably, the turrets (20A, 20B) located at the first and second workstations can be moved along both the X and Z axes, while the turret (20C) located at the third workstation can be moved along the X axis.

Abstract: In order to design a lathe comprising a machine frame, a first working spindle for a first workpiece held on the machine frame, at least one first tool carrier for the machining of the first workpiece, a second working spindle for a second workpiece which can be brought from a coaxial position into a non-coaxial position in a transverse direction in relation to the first working spindle, and a first tool carrier on the front side associated with a first working space, and a second tool carrier on the front side associated with a second working space, in such a manner that it is possible for machining operations on the first workpiece and the second workpiece to be as flexible as possible, it is suggested that the first tool carrier on the front side and the second working spindle be movable in the transverse direction relative to one another controlled by a machine control.

Abstract: A method and apparatus for adapting a turret extender to Computer Numeric Controlled (CNC) lathes, equipped with a main turret which is indexable about an indexing axis is disclosed. The disclosed turret extender mounts directly to the Original Equipment Manufacturer's (OEM) turret to extend the maximum turning diameter of the lathe by augmenting the original tool mounting configuration. The turret extender can accommodate, individually or in combination one or more standard tools, one or more modular tools and one or more relocated tools either standard or modular. By attaching to an OEM turret, the turret extender utilizes the original indexing electronics and hydraulics of the OEM main turret. The turret extender therefore provides enhanced machining capability in a cost efficient manner.

Abstract: A machine tool comprises a fixed bed; a carriage with a tool post mounted thereon is provided on the fixed bed on one side; and a headstock is provided on another side so that the headstock is connected to a headstock base and is movable between a workpiece machining position for machining a workpiece and a workpiece loading/unloading position for loading or unloading a workpiece. The tool also includes a chip collecting space disposed in a cut out portion of the fixed bed adjacent to the workpiece loading/unloading position and a headstock guide unit comprising a guide support mechanism for supporting a front portion of the headstock base by the fixed bed when the headstock base is positioned at the workpiece machining position, and for supporting a rear portion of the headstock base by the fixed bed when the headstock base is positioned at the workpiece loading/unloading position.

Abstract: A turret tool rest (14) includes a turret (24) movably supported on a base (22), on which desired tools can be mounted at predetermined indexable angled positions. A pair of coupling elements (66, 68), which can be engaged with each other, are arranged between the base (22) and the turret (24). The coupling elements (66, 68) are moved between an engaged position at which they are mutually engaged to fixedly hold the turret at respective indexed positions on the base, and a disengaged position at which they are mutually disengaged to permit the turret to be rotationally indexed. A spring-loaded plunger unit (80) serves to prevent the turret (24) from freely rotating on the base (22),until the coupling elements (66, 68) are fully engaged with each other, during the moving operation of the coupling elements between the engaged and disengaged positions.

Abstract: In order to improve a machine tool for the turning of workpieces with eccentric sections, comprising a tool support, a workpiece spindle which comprises a workpiece chuck, in which the workpiece can be clamped with a variably adjustable eccentricity, wherein the workpiece chuck has a chuck housing, a collet actuation and a collet support arranged in the chuck housing and having a collet held therein, the collet being adapted to be brought into concentric or eccentric adjustable positions relative to the spindle axis, in such a manner that the adjustment of the collet support relative to the chuck housing can be brought about more simply it is suggested that an adjusting element be provided on the machine tool which is movable towards the workpiece chuck for the adjustment or the respective adjustable position of the collet and may be brought into operative connection with the collet support and that in this operative connection the relative movement between the collet support and the chuck housing for alterin

Abstract: A cryogenic fluid distributor for turret machine tools (e.g., lathes) directs a stream of cryogenic fluid from an external, pressurized cryogen source to a working position of a machine tool to prevent overheating of the tool. Designed for easy retrofitting and synchronizing with multi-tool turret machines, the distributor allows for a “dual-fluid” machining capability combining a cryogenic fluid and a conventional cutting fluid (flowing via a conventional coolant system built into a given machine tool). Made of low thermal-mass, insulating polymer and metallic parts, the distributor utilizes the different thermal contraction coefficients of the parts to establish cryogenic sealing connections, which eliminates undesired turret plate cooling and assures rapid cryogen flow start-up.

Abstract: A complex tool has a main body and a turning tool provided at an outer periphery portion of the main body. The turning tool is capable of machining on a rotating workpiece without rotating itself. An insert installed on the turning tool has a top end which contacts a workpiece by projecting a predetermined amount outside the main body's outer peripheral face. It also projects a predetermined amount from a top end portion of the main body in a direction of an axial center of the tool. The complex tool also has a rotating tool for machining by rotating itself. The rotating tool accomplishes machining corresponding to an axial center of the main body.

Abstract: In order to design a lathe comprising

Abstract: A numerical controlling device and a tooling apparatus having thereof, in which performance required for the machining is greatly improved correspondingly to a degree of importance according to a type of the machining and thus high efficiency and high accuracy in the machining can be obtained, by referring a database based on a type of a specified cutting tool and workpiece, and of a machining mode including an operating path of a movement of the cutting tool and workpiece, and by selecting a control parameter which relates to an adequate operating speed and operating position in the entire operating path during machining and non-machining.

Abstract: The invention relates to a machine tool for machining a rod-shaped workpiece. The machine tool comprises a tool spindle, and also a first holder and a second holder for accommodating the workpiece. In a machining position, the second holder is oriented coaxially to the first holder, and it is arranged so as to be capable of rotating or swiveling about an axis perpendicular to a longitudinal axis of the workpiece.

Abstract: A lathe is provided which includes at least one workpiece spindle which is rotatable about a spindle axis. The lathe includes two tool carrier systems each comprising a slide system having at least a Z slide and a X slide and further comprising a tool carrier. The tool carrier system is movable relative to the machine frame in a Z direction parallel to the spindle axis. Each of the tool carrier systems is guided independently of the other respective tool carrier system with its own Z slide in the Z direction on the machine frame. The tool carrier systems are arranged on the same side of the spindle axis and each tool carrier system is movable in the Z direction on a path extending towards the other tool carrier system. Each slide system has a guide plane for the X slide defined by a X guide.

Abstract: A lathe (10) has a lathe bed (11) on which is mounted a cutting station at which a cutting tool (13) can be mounted, a guide defining a guide path for guiding relative feeding movement between a workpiece holder (14) and the cutting tool (13), and drive means (15) for relatively moving the workpiece and the cutting tool (13) to engagement with each other. In order to provide a gap-swing facility, and avoid the present requirement in known lathes to provide a “removable gap-piece”, the invention provides a guide in the form of three parallel guide elements, namely a main front guide-way (17), a tailstock bed-way (18) and a rear ante-roll guide-way (19), which are spaced apart from each other and relative to the center line (16) of the workpiece holder (14). The three parallel guide elements (17, 18, 19) gap or cavity so that the required gap-swing facility is provided substantially without loss of guide-way support.

Abstract: A machining center comprising a frame and, borne by this frame, two devices, referred to as workpiece support devices because each allows a workpiece to be machined to be supported and driven in rotation about a control axis, this machining center being characterized in that:

Abstract: A machine tool system with a primary motor and a first slave motor, each motor operably being adapted to drive a separate sub-system within the machine tool system, wherein a control system operably controls the speed of the first slave motor at a predetermined speed relative to the speed of the primary motor.

Abstract: An assembly for fastening and locating an added head of a numerical machine tool comprises two cylinder mounts located in the periphery of a main shaft of the numerical machine tool. A piston is movably disposed between the two cylinder mounts such that the piston is driven by the hydraulic-pneumatic loops to move up and down so as to control the movement of an engagement block for retaining a retaining block of the added head. The main shaft of the numerical machine tool is provided with a crank-tooth coupler to facilitate the adjusting of the angular position of the added head in accordance with the operational requirement for processing a workpiece.

Abstract: A cutting tool is disposed on a turret. The cutting tool includes: a holder having a peak end, and a throw-away insert clamped to the peak end of the holder with a clamp screw. The holder has a bottom face and a peak end face defining a corner of the holder. The corner of the holder forms a chamfered face. The throw-away insert has a bottom face and a relief face defining a corner of the throw-away insert. The corner of the throw-away insert forms a chamfered face. The chamfered face of the corner of the holder and the chamfered face of the corner of the throw-away insert prevent the cutting tools adjacent to each other from causing an interference with each other when the cutting tools are at least one of in a standby position and in a machining operation.

Abstract: A cutting tool is disposed on a turret. The cutting tool includes: a holder having a peak end, and a throw-away insert clamped to the peak end of the holder with a clamp screw. The holder has a bottom face and a peak end face defining a corner of the holder. The corner of the holder forms a chamfered face. The throw-away insert has a bottom face and a relief face defining a corner of the throw-away insert. The corner of the throw-away insert forms a chamfered face. The chamfered face of the corner of the holder and the chamfered face of the corner of the throw-away insert prevent the cutting tools adjacent to each other from causing an interference with each other when the cutting tools are at least one of in a standby position and in a machining operation.

Abstract: A twin-head beveling machine for high-precision machining on heads of pipes, comprising two mutually opposite pressers and machining heads with a rotating disk; the pressers are rigidly connected to each other by a central fixed shaft and the heads are mounted so that they can rotate and move axially individually on the central fixed shaft. The machining heads are subjected to the action of hydraulic or pneumatic motors and of axial movement elements, which are activated by a respective hydraulic or pneumatic actuator and produce the axial working advancement of the respective head.

Abstract: A machine tool comprises a fixed bed; a carriage with a tool post mounted thereon is provided on the fixed bed on one side; and a headstock is provided on another side so that the headstock is connected to a headstock base and is movable between a workpiece machining position for machining a workpiece and a workpiece loading/unloading position for loading or unloading a workpiece. The tool also includes a chip collecting space disposed in a cut out portion of the fixed bed adjacent to the workpiece loading/unloading position and a headstock guide unit comprising a guide support mechanism for supporting a front portion of the headstock base by the fixed bed when the headstock base is positioned at the workpiece machining position, and for supporting a rear portion of the headstock base by the fixed bed when the headstock base is positioned at the workpiece loading/unloading position.

Abstract: A turret (24) is clamped on a tool rest body (22) by a pair of coupling elements (66, 68). During a rotational indexing operation for a tool selection, the tool rest body (22) and the turret (24) are moved relative to each other along a Z-axis, to disengage the coupling elements (66, 68) and thus unclamp the turret (24). At this time, the tool rest body (22) is moved relative to a lathe base (10) along the Z-axis, synchronously to the relative movement of the tool rest body (22) and the turret (24) along the Z-axis. The direction and distance of the motion of the tool rest body (22) relative to the lathe base (10) is adjusted so as to eliminate the relative movement between the turret (24) and a spindle stock (12). This motional control serves to prevent the turret (24) and a tool attached thereto from moving relative to the spindle stock (12) and a workpiece, whereby the problem of interference between these components can be solved.

Abstract: A turret (11) is clamped to a tool rest main body (10) by a pair of coupling members (27). During indexing rotation for selecting a tool, the tool rest main body (10) and the turret (11) are moved relatively in a Z-axis direction, and the pair of coupling members (27) are unclamped. At this time, the tool rest main body (10) is moved in the Z-axis direction relative to a lathe main body (100) in synchronism with the relative movement in the Z-axis direction between the tool rest main body (10) and the turret (11). This movement of the tool rest main body (10) is adjusted in direction and moving distance so that the relative movement between the turret (11) and a spindle table (1) is eliminated. As a result of this movement control, the turret (11) and the tool fitted to the former do not have relative displacement to the spindle table (1) and to a work, so that the danger of mutual interference among these constituent elements and the work can be eliminated.

Abstract: An electromagnetic workpiece positioning and holding device is mountable on a metal working lathe for pulling bar stock to a working position relative to metal working tools and/or for holding and stabilizing an outermost end portion of a workpiece during a cut-off operation. The coil of the electromagnet is in an electrical circuit with a 24 volt power supply and a control switch by which the coil is connected to and disconnected from the power supply.

Abstract: A turret (11) is clamped to a tool rest main body (10) by a pair of coupling members (27). During indexing rotation for selecting a tool, the tool rest main body (10) and the turret (11) are moved relatively in a Z-axis direction, and the pair of coupling members (27) are unclamped. At this time, the tool rest main body (10) is moved in the Z-axis direction relative to a lathe main body (100) in synchronization with the relative movement in the Z-axis direction between the tool rest main body (10) and the turret (11). This movement of the tool rest main body (10) is adjusted in direction and moving distance so that the relative movement between the turret (11) and a spindle table (1) is eliminated. As a result of this movement control, the turret (11) and the tool fitted to the former do not have relative displacement to the spindle table (1) and to a work, so that the danger of mutual interference among these constituent elements and the work can be eliminated.