Abstract: A lathe machine includes a turret having a saddle movable along a longitudinal direction toward a headstock, and a turret body mounted on the saddle and movable along a transverse direction on the saddle, and a tailstock having a bottom seat movable along the longitudinal direction toward the headstock, and a tailstock body mounted movably on the bottom seat. A first coupler unit is provided to couple releasably the saddle and the bottom seat so that the bottom seat can be driven by the saddle to move along the longitudinal direction toward the headstock. A second coupler unit is provided to couple releasably the turret body and the tailstock body so that the tailstock body can be driven by the turret body to move along the transverse direction.

Abstract: The present invention provides a precision roll turning lathe which can form a pattern including three-dimensionally shaped portions, such as three-sided pyramids, on the surface of a roll, with high accuracy. Specifically, a tool post is provided with a tool turning axis (A axis) which is used to turn a tool such that, when forming a spiral groove cut through the roll, a cutting face of a tip of the tool is oriented perpendicular to a direction along which the spiral groove extends.

Abstract: A multi-axis turning center for turning operations includes a machine body, a tool rest means for holding a tool, a first headstock for holding a workpiece, and a second headstock disposed in confronting relation to the first headstock, for holding a workpiece. The second headstock has a front chuck and a rear chuck for gripping respective workpieces. The second headstock performs a workpiece changing function by swiveling about a central axis. The multi-axis turning center is capable of automatically changing the workpieces by itself while it is carrying out a machining process, without the need for a workpiece changer. The multi-axis turning center does not need to stop its machining process for changing workpieces, resulting in an increase in the utilization ratio thereof.

Abstract: The invention provides a vertical turret lathe capable of preventing an inner diameter turning tool attached to a turret tool rest from interfering with a workpiece during machining of the outer diameter of the workpiece. The vertical turret lathe comprises a work table that holds a workpiece W1 and rotates, and a working head 40 having a turret tool rest 50 and capable of moving in X-axis and Z-axis directions. A tool holder 70 for holding an inner diameter turning tool T2 via hydraulic pressure is attached to a part of the tool supporting portions 60 of the turret tool rest. The automatic tool changer apparatus 100 includes a turret-type tool magazine 120 and pistons 160 and 162, which mechanically press the pins 74 and 76 of the tool holder 70 and clamp or unclamp the tool T2.

Abstract: The invention relates to a tool revolver (10, 11) with: a rotationally mounted tool carrier (6) that can be pivoted into the respective working position for a tool by means of a pivot drive; fixed tools (14), and; at least one rotationally drivable tool (15, 16). Particular advantageous result due to the fact that the rotationally drivable tool (15, 16) is mounted on the front face of the tool carrier (6). The invention also relates to a machine tool (1) equipped with a tool revolver (10, 11) of the aforementioned type.

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: According to the invention, the pin (6) is rotated by the motor (5) via the belt (10) and the pulley (11) that is precision-held on the fixed bushing (13). It comprises a pin arm (16) whose solid rear portion (20) rotates in the bushing (13) and is coupled by screws (18), and the centring part (19) at the inner area of the pseudo universal-joint disk (17) whose outer area is coupled to the pulley (11). A second pseudo universal-joint connection is provided between the rear portion (20) of the pin arm (16) and the front portion thereof (21), which is connected to the clamp-holding bushing (7) in which the clamping collet (8) is mounted.

Abstract: A machine-tool turret-type unit includes a turret disk that is free to rotate about a rotational axis, and a housing on which to mount the turret disk is provided. The housing includes at least one securing device to be secured to the securing section of the machine tool. The securing device includes at least one securing surface to rest against the securing section of the machine tool. The rotational axis lies within a first plane defined by the securing surface(s).

Abstract: The invention relates to a turning center which comprises a machine frame, a first workpiece spindle unit having a first workpiece spindle, a second workpiece spindle unit, which is disposed on the machine frame and having a second workpiece spindle, at least one tool carrier unit, which is disposed on the machine frame and on which at least one tool for machining a workpiece held in the workpiece spindle units is disposed, and a working space, in which workpieces held in the workpiece spindle units can be machined with the tool. The aim of the invention is to provide a turning center which is compact as possible while allowing extensive turning and/or milling applications, and also ensures highest possible machining accuracy.

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: A tool turret, with a base body (1) which is attached or is to be attached to a machine tool and which defines a turret axis (13) around which the tool disk (7) is pivoted on the base body (1) and which disk has a plurality of tool stations (45) which are distributed on its periphery and which, by turning the tool disk (7), can be set into at least one working position at a time, in which a tool drive (31, 35), located within the tool disk (7) with its output-side gear part (35) which can be turned around an axis of rotation which is radial to the turret axis (13), by coupling engages the tool-side coupling part for driving at least one tool which is located on the tool station (45) which is aligned to the working position, is characterized in that the output-side gear part (35) is located in the tool disk (7) to be pivotable around the turret axis (13), and that in the tool disk (7) there is a clutch (47) which can be switched between a first operating position in which the output-side gear part (35) for piv

Abstract: A tool holder positioning device includes: a plurality of protruded portions or a plurality of recessed portions formed to a seating surface of a tool rest; and a plurality of recessed portions or a plurality of protruded portions formed to a coupling surface of a tool holder so as to correspond, respectively, to a plurality of protruded portions or a plurality of recessed portions formed to the seating surface of the tool rest, when the seating surface and the coupling surface are contacted. At least one of the protruded portions and at least one of the recessed portions are disposed on an intersecting axis included in the seating surface, and the recessed portions and the protruded portions to be fitted to the plurality of protruded portions and the plurality of recessed portions are disposed on an intersecting axis included in the coupling surface.

Abstract: A machine tool capable of in-machine measurement of workpiece dimensions while achieving size reduction of the machine tool and prolonged life of a sensor. The machine tool machines a workpiece held at a spindle and comprises: a turret tool post having tool holding faces; a support strut mounted on one of the tool holding faces and extending radially of the turret tool post; a sensor fixed to a head portion of the support strut and measuring the dimensions of a workpiece; and a first cover piece and a second cover piece supported by a base portion of the support strut. The first cover piece and the second cover piece are capable of opening and closing circumferentially of the turret tool post, and cover the support strut and the sensor when closed.

Abstract: A rotary tool-equipped tool rest is provided, including a movable member made to move frontwardly when a turret is clamped with respect to a non-swiveling housing after swiveling and indexing. Then, a phase determining pin provided in the turret is made to project and engage with the non-swiveling housing. Further, a coupling mechanism to clamp the turret with respect to the non-swiveling housing has three coupling members.

Abstract: A main spindle and a back spindle grip works W, respectively. Or, the main spindle grips one end of a work W and the back spindle grips the other end of the work W. A tool is attached to a tool spindle. By adjusting the positions of the spindles and the position of the tool spindle, the work W gripped by the main spindle and the back spindle is machined by the tool. Since tool spindle can change the direction of the tool, the work W, including both ends thereof, can be entirely machined into a complex shape. A guide bush supports the work W to prevent the work W from being bent when a lengthy work W is machined. Therefore, this lathe can entirely machine a long or short work into a complex shape.

Abstract: A dual disc type of tool turret device is powered by means of single main power source, which also serves to power the spindle of the machine; the turret device includes an inner and outer tool turrets; when power is transmitted from the main power source through a transmission element, a piston clutching piece, and rotary shaft (A), the inner turret will be rotated to carry out a tool-choosing operation; when power is further passed on to rotary shaft (B) through rotary shaft (A), the inner turret will be rotated to carry out a tool-choosing operation; after the tool-choosing action, power is supplied to the spindle of the machine in order for the machine to carry out a machining operation.

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: 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: The invention relates to a tool revolver (10, 11) with: a rotationally mounted tool carrier (6) that can be pivoted into the respective working position for a tool by means of a pivot drive; fixed tools (14), and; at least one rotationally drivable tool (15, 16). Particular advantageous result due to the fact that the rotationally drivable tool (15, 16) is mounted on the front face of the tool carrier (6). The invention also relates to a machine tool (1) equipped with a tool revolver (10, 11) of the aforementioned type.

Abstract: A lathe for machining optical workpieces, in particular spectacle lenses, comprises a fast tool arrangement and a workpiece spindle arrangement. A machine frame is cast monolithically from polymer concrete and on and in which all the functional surfaces, functional spaces and other cutouts are formed to their exact dimensions during the casting process. The machine frame upper part cast in one piece simultaneously covers the fast tool arrangement and the workpiece spindle arrangement and thus the machine bed in the manner of a covering hood. The machine frame is of compact dimensions, has a very rigid oscillation-damping machine bed and, in comparison with the rapidly moving elements of the fast tool arrangement, has a very large mass with a high center of gravity, which prevents the transmission of disruptive oscillations from the fast tool movement to the machine bed and thus to the workpiece spindle arrangement.

Abstract: The tool support comprises a basic structure (8) on which a slide (5) is movable in a controlled manner transversely to the spindle axis (7), two tool holders (6) being mounted on said slide which are displaceable parallel to each other and serving to hold different tools (9,9?), said holders (6,6?) being selectively displaceable in the direction of the spindle axis (7) or away from that axis through an angle of 90° with respect to the direction of movement of the slide (5), and further comprising driving means (1,2,3,3?) to displace the slide (5) and the tool holders (6,6?) along their axis of movement (Y,Z) into a predetermined working position.

Abstract: To provide a machine tool in which supporting stiffness of a tool post is increased, thereby enabling improvement in machining accuracy. When seen in a Z-axis direction, a tool post 5 includes: a supporting member 30 having a pair of left and right leg parts 30a, 30a and an upper beam part 30b coupling at least upper ends of the both leg parts 30a with each other; and a turret 31 to whose outer circumferential portion a plurality of tools are attached. The supporting member 30 is supported to be movable in a Z-axis direction between a first and a second spindle headstock 3, 4, and the turret 31 is supported to be movable in an X-axis direction by turret guide rails 33, 33 which are disposed on front faces of the left and right leg parts 30a, 30a.

Abstract: A turret includes a central shaft, a piston sleeve positioned around the central shaft and having moving sticks thereon, a push rod, an actuating seat, and internal and external turrets; the piston sleeve is left and right movable by a power source; the moving sticks are passed through a ringed sleeve, which props a push rod passed through a fixed clutch claw, and facing the actuating seat; the actuating seat includes a rotary shaft, a pivotal shaft, and a toothed ring seat; the piston sleeve can be moved such that the moving sticks and the push rod move forwards, and the rotary shaft engages the toothed ring seat for a tool of a straight tool seat to function; alternatively the piston sleeve can be moved such that the moving sticks and the push rod move backwards, and the rotary shaft disengages the toothed ring seat for allowing replacement of the toothed ring seat.

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: To provide a machine tool in which positioning accuracy of a ram is ensured, realizing improved machining accuracy. A cylindrical ram 14 supporting a spindle 6 is inserted in a ram guide hole 13a formed in a cross slide 13, the ram 14 has supported surfaces 14d, 14d in a V-shape formed on a lower side of an outer circumferential surface thereof, and the supported surfaces 14d are placed on supporting surfaces 22a, 22a in a V-shape formed on an inner circumferential surface of the ram guide hole 13a of the cross slide 13, so that a Z-axis direction position of the ram 14 is automatically aligned.

Abstract: To provide a composite lathe enabling the overlapping of movement areas without lowering supporting stiffness of a tool post, and thus realizing enhanced machinability. An XY supporting plane A by which a tool post 5 in is supported to be movable in an X-axis direction is set non-parallel to an XZ supporting plane B by which a third spindle 6 is supported to be movable in the X-axis direction, and an axis of the movement in the X-axis direction of the tool post 5 is set apart in a Y-axis direction from an axis of the movement in the X-axis direction of the third spindle 6.

Abstract: To provide a composite lathe enabling downsizing of a machine main body and realizing an enlarged machining area. A cutting point “c” of a tool post 5 is positioned vertically under a straight line connecting axes “a” of a first spindle headstock 3 and a second spindle headstock 4, and an X-axis stroke of a cutting point of a third spindle 6 overlaps an X-axis stroke of the tool post 5 by a half or more of the X-axis stroke of the tool post 5.

Abstract: To provide a tool changer of a machine tool capable of preventing chips from scattering to the outside of the machine from an opening of a cover to adhere to a sliding portion or a gripper portion during tool change. A tool magazine 42 holding a large number of tools is disposed on a machine outer side of a cover 62 disposed to surround a machining area of a third spindle 6. The cover 62 has a tool through hole 62c from which a tool held by a tool holding part 6c of the third spindle 6 is protruded to the machine outer side of the cover 62. Tool change is performed while the tool is protruded to the machine outer side from the tool through hole 62c and the tool through hole 62c is closed by the tool holding part 6c.

Abstract: An indexible turning tool for chip forming machining, includes a holder equipped with insert pockets receiving replaceable inserts, as well as a securing portion intended to be received in a tool machine. At least one of the replaceable inserts has a main plane that extends laterally in relation to the tool's axial direction.

Abstract: To provide a machine tool in which a workpiece can be delivered to/from a first and a second spindle headstock without any increase in front/back direction dimension of a machine main body. A second spindle headstock 4 is capable of moving to a position for workpiece delivery to/from a first spindle headstock 3 so as to be close to or to abut on the first spindle headstock 3. When the second spindle headstock 4 is positioned at the workpiece delivery position, a tool post 5 is positioned right under the first spindle headstock 3 so that its cutting point “c” is positioned vertically under an axis “a” of the first and second spindle headstocks 3, 4.

Abstract: In order to provide a multiple spindle machine tool having a machine frame, a first spindle slide with a first workpiece spindle, and a second spindle slide with a second workpiece spindle, wherein first spindle slide and second spindle slide are guided on the machine frame for linear displacement, and a tool receiving device, which is of a simple construction with minimized space requirements with respect to the workpiece spindles, a first guide and a spaced second guide are arranged on the machine frame, both the first spindle slide and the second spindle slide being guided on these guides, and the first workpiece spindle and the second workpiece spindle being arranged between the two guides.

Abstract: A tool for chip removing machining includes a tool head having at least one chip pocket formed therein which serves as a common pocket for first and second replaceable cutting inserts. The inserts perform mutually different machining operations and have their respective active surfaces disposed in generally mutually facing relationship to one another within the pocket. A radially outermost portion of the first insert is spaced farther from a center axis of the tool head than is a radially outermost portion of the second insert.

Abstract: A turret body is provided with a tool spindle for detachably attaching a complex tool so as to be freely rotated with an axial center as its center. The turret body is provided with indexing means for indexing the tool spindle, and clamping means for clamping the tool spindle at an indexed position indexed by the indexing means. The turret body has a function for indexing the tool spindle for attaching the complex tool thereto and a function for clamping, thereby using the complex tool in a turret lathe.

Abstract: It is one object of a hale-machining method and apparatus thereof according to the present invention to achieve an easy preparation of an NC machining program and perform a high geometrical accuracy in the predetermined three-dimensional free curved surface. A haling tool 34 is set on a tool holder 32 in such a manner that a cutting point P of the haling tool 34 is substantially coincided with an intersection of a first rotating axis B, a second rotating axis A and a third rotating axis C. A rotary table 16 and a rotary base 24 are rotated in such a manner that a tool axis direction of said haling tool is substantially coincided with a normal direction of said machined surface. A tool holder 32 is rotated in such a manner that a front rake surface of the haling tool 34 is substantially directed in perpendicular to a feeding direction of said haling tool 34.

Abstract: A turret of a lathe has a power transmission that is used for moving a tool Disk secured on a shaft to a secured position where the disk is engaged with a clutch. The transmission includes a piston, and a force multiplier unit, which includes a ring, a sleeve secured to the piston, and steel beads. The ring has first sloping trenches. The sleeve has sloping trenches that are less steep and opposing the first trenches, and has recesses connected to the trenches. The steel beads are held in respective ones of the spaces defined by the sloping trenches and the recesses, and are positioned next to a gear secured on the shaft such that when the piston is actuated for moving the tool disk towards the secured position, the steel beads will push the gear with multiplied force output while being rolled along the sloping trenches.

Abstract: A crankshaft production machine for manufacture of crankshafts (15) having centric and eccentric surfaces to be machined, the said crankshafts being chucked rotatably around a C axis (5, 6), comprises a headstock, a counter spindle or tailstock, at least one displaceable longitudinal slide (17, 18), and drive units with motors for the drive motion of the crankshaft around the C axis and for the feed motion of subassemblies for tool spindles (8, 11) as well as the tools, wherein the respective motors in at least one drive unit used to drive the workpiece spindles (1, 3) and in at least one drive unit used to drive the tool spindles (8, 11) are configured as torque motors (2, 4, 10, 13).

Abstract: There is provided a tool holder capable of attaching a plurality of tools to one tool holder, and easily adjusting these tools in a positional relation suitable for work machining. The tool holder comprises a holder body 201 attached to a tool rest 160, a plurality of surfaces 202 and 203 formed around the holder body 201, holders 210 and 220 attached to the surfaces 202 and 203 and having tools for machining the work attached thereto, toothed portions 208 and 209 of tooth-shaped rows formed in a predetermined direction on the surfaces 202 and 203, engaging portions 211 and 221 formed on the surfaces of the holders attached to the surfaces 202 and 203, and engaged with the toothed portions to position the holders in predetermined positions of the surfaces 202 and 203, and attaching means 240 and 250 for attaching the holders to the holder body in engaging states between the toothed portions and the engaging portions.

Abstract: An NC lathe 1 comprises a bed 5, a headstock 10 provided on the bed 5, a main spindle 11 supported on the headstock 10 so as to be rotatable around the axis thereof, a rotation drive device for rotating the main spindle 11, a stationary frame 15 formed in a rectangular frame shape and fixed to the upper face of the bed 5, a movable frame 16 formed in a rectangular frame shape and provided so as to be movable in the Z-axis direction with respect to the stationary frame 15, a saddle 17 provided so as to be movable in the X-axis direction with respect to the movable frame 16, a quill 18 accommodated inside the accommodation hole 17a in the saddle 17 and provided so as to be movable in the Y-axis direction, and a tool rest 20 supported on the quill 18.

Abstract: A lathe 1 comprises a bed 5, a headstock 10 having a housing 13 and a support base 14, a main spindle 11, a first tool rest 44, and a second tool rest 50. The support base 14 is formed so as to have a concave portion 14a on the upper portion thereof and so that the upper portion protrudes toward the second tool rest 50. The tool rest body 51 of the second tool rest 50 is configured so as to be movable into and out of a space formed downward from the upper portion of the support base 14. The housing 13 has a holding hole 13a for rotatably holding the main spindle 11, and installation portions 13b. The installation portions 13b are supported on the support base 14 in a state wherein a predetermined clearance is provided between the housing 13 and the concave portion 14a.

Abstract: A machine tool assembly having a base assembly movable relative to a support selectively a) oppositely parallel to a first line, and b) oppositely parallel to a second line that is orthogonal to the first line, and a first spindle headstock movable with the base assembly and having a central axis extending parallel to the first line and a working end. The machine tool assembly further includes a first turret assembly movable with the base assembly and having a first turret headstock and a first turret head that is movable around a first axis relative to the first turret headstock. The first turret head is movable selectively into first and second different angular positions around the first axis relative to the first turret headstock.

Abstract: An indexible turning tool for chip forming machining, includes a holder equipped with insert pockets receiving replaceable inserts, as well as a securing portion intended to be received in a tool machine. At least one of the replaceable inserts has a main plane that extends laterally in relation to the tool's axial direction.

Abstract: The invention relates to a machine tool, especially a lathe, comprising a machine frame upon which a first and second spindle housing carrier are arranged in such a way that they can move in a direction Z in relation to each other; a first working spindle; a second working spindle; a first tool carrier which is associated with the first working spindle; a second tool carrier which is associated with the second working spindle, said first and second tool carriers being arranged on the same side of the spindle axis; and a machine control unit.

Abstract: The invention relates to a tool revolver comprising a revolver head (12) which is supported by a housing (20) and which can be rotated in relation to said housing (20) by means of at least one axial bearing (24). The axial bearing (24) is mounted in between the revolver head (12) and the housing (20) in the direction of the revolver head (12) by means of a locking member (32). The hydraulic medium producing the fluidic pressure can be placed in between the locking member (32) and a connecting element (38). The connecting element (38) engages with the locking member (32) from below in such a way that the axial bearing (24) is subject to pressure when the revolver head (12) is in a locked or unlocked state. Consequently, all major functions are brought together in a minimum amount of construction space, requiring only a minimum amount of components.

Abstract: An automatic lathe (10) is provided with a first spindle (14) having an axis of rotation (14a), a first tool rest (18) capable of holding a plurality of tools (22) in a parallel arrangement, a second tool rest (20) capable of holding a plurality of tools (22) in parallel arrangements in a first row and second row exhibiting mutually different nose orientations, and a second spindle (16) having an axis of rotation parallel to the axis of rotation of the first spindle and capable of being located facing the first spindle, in such a manner as to be centrally carried on a lathe bed (12). The first spindle can move linearly along a first control axis parallel to its axis of rotation. The first tool rest can move linearly along a second control axis perpendicular to the first control axis. The second tool rest can move linearly along a third control axis perpendicular to the first control axis and a fourth control axis parallel to the first control axis.

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 machine tool such as an NC lathe having a machine body is disclosed. The machine tool comprises a fixed bed, a machine body having a carriage with a tool post mounted thereon is provided on one side of the fixed bed nearer to an operator, and a headstock for loading a workpiece thereon is provided on another side of the fixed bed farther from the operator. The machine tool also includes a cover having a front wall and a side wall to cover at least a front face and a side wall of the machine body, respectively. The cover is provided so as to externally surround the machine tool, and wherein a portion of the side wall of the cover adjacent the tool post includes a door opening formed therein and a side door for opening and closing the door opening. Thus, the tool replacement work is facilitated and the overall workability of the machine tool can be improved.

Abstract: The invention concerns a machine for the chip-forming machining and the measurement of gears and screw-type workpieces. Arranged on a swivel head (6) swivellable about an axis (A) at right angles to the rotary axis of the workpiece (4) are functional units (8a, 8b, 8c, 8d) with machining and measuring tools (10, 12, 14, 15, 17) which are displaceable radially and parallel relative to the swivel axis (A), which said tools can be brought consecutively into engagement with the workpiece (4), thus making possible the application of different tools (10, 12, 14, 15, 17) and machining techniques in the same work set-up without colliding. The work spindle (1) is driven by electric motor either directly or via a gear unit.

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: 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.