Abstract: In a plural-roll rolling mill having a pass line arranged by the respective sets of rolls, each having a caliber formed on the outside peripheral surface thereof, the outside peripheral surfaces being disposed close to each other, the calibers of the rolls being cut with a cutting tool of a three-dimensionally (forward and rearward, rightward and leftward and upward and downward) movable cutting machine. The rolling mill, which has a reference column disposed on the outside surface thereof at a position spaced apart from the pass line by a predetermined distance, is removed from a rolling line and fixed, and the positional alignment of the cutting tool is carried out by causing a contact sensor disposed on the cutting machine at a position spaced apart from the cutting tool by a predetermined distance to come into contact with the reference column. With this arrangement, there are provided a method and apparatus capable of cutting the rolls of the plural-roll rolling mill while mounted on the rolling mill.

Abstract: A machine tool is provided having a spindle mounted for movement in a direction parallel to the spindle axis, the Z direction, and a direction perpendicular to the spindle axis, the X direction. The machine tool includes a machine bed and has means mounted to the machine bed for supporting at least one tool. At least one spindle is rotatably supported on the machine bed and includes a chuck for supporting a workpiece. The machine tool includes means mounting the spindle to the machine bed for movement in the Z direction and for independent movement in the X direction. Accordingly, the workpiece supporting means may be moved proximate to the tool supporting means and the workpiece may be engaged by a tool. The machine tool may further include feeder means for feeding bar stock to the workpiece supporting means so that the bar stock may be engaged by a tool. The machine tool may also include workpiece transfer means for facilitating the transfer of workpieces to and from the workpiece supporting means.

Abstract: Depleted stock feeder tubes, and feed malfunctions, are detected in bar fed machines such as automatic screw machines, CNC lathes and the like, employing reciprocating feed tubes with flexible feed fingers that grip the stock, with a sensor assembly mounted on a pivoted stock feeding lever or other feeder mechanism. The body of the sensor assembly is positioned to press against a roller or other connecting member extending laterally from the feed tube assembly, and retract the feed tube. A plunger or other reciprocating contact member is mounted in and biased to extend from the body. If a feed tube is stocked when the feed tube is retracted, the force required to retract the feed tube is greater than the biasing force on the plunger, the plunger moves, and a proximity sensor or other detector senses the new position or motion of the plunger.

Abstract: A portable machine tool comprises a main spindle and a machine body that is rotatable relative to the main spindle. A take-off shaft is mounted in the machine body and is rotatable relative to the machine body, and a rocker arm is rotatable about the axis of the take-off shaft. A cam and follower mechanism converts rotation of the machine body to reciprocating rotation of the rocker arm, and a releasable clutch mechanism that is effective between the rocker arm and the take-off shaft can be switched between a first state in which it converts reciprocating rotation of the rocker arm to unidirectional rotation of the take-off shaft and a second state in which reciprocating rotation of the rocker arm has no effect on the take-off shaft.

Abstract: A cutting metal-working machine for processing hooke's joints, including a machine base, a control panel for controlling the operation of the machine, a left tool carrier and a right tool carrier mounted on the machine base at two opposite locations and having a respective cutting tool controlled to synchronously cut two opposite ends of the workpiece, a first tailstock and a second tailstock respectively mounted on the machine base at two opposite ends and having a respective center pin moved by a hydraulic cylinder to hold the workpiece in place, and a workpiece rotating mechanism mounted between the tool carriers and the center pins of the tailstocks, and controlled to turn the workpiece relative to the cutting tools of the tool carriers.

Abstract: The invention concerns a multi-spindle automatic lathe intended for machining bars of material. Such lathe comprises: a spindle carrier (2) adapted to be displaced in rotation and translation and on which spindles (3) intended for holding bars (M) are assembled together, and bar (M) shaping means including tool bearing carriages (14) which are arranged and adapted in order to receive machining tools (12) and which are directed by control cams (16, 18) supported and driven in rotation, such lathe being characterized in that the shaping means are mounted around a central body (50) which assures the interior guidance of the spindle carrier (2) while the shaping means and the spindles (3) assembled on the spindle carrier (2) are actuated from the exterior by peripheral driving means.

Abstract: An electronic control device for individual drives of machining machines, particularly of machine tools with a plurality of drive apparatuses, in which, according to the counting state of a pulse counter (35), path information elements associated with the latter are extracted simultaneously by a computer unit (37) from memories (41, 42, 43) associated with many drive apparatuses (18, 19, 20) and are converted into control values necessary for machining, which control values are then fed as set values to control circuits (30, 31, 32) for the drive apparatuses (18, 19, 20). The electronic control device (37) is supplied with a low counting pulse frequency (f.sub.z) and can therefore process path and speed information values from a memory unit (36) for very many drives (18, 19, 20) simultaneously.

Abstract: The invention comprises an automatic lathe apparatus adapted to be programmed for automatically cutting work pieces into contours with a pair of radial saw blades. The apparatus has an elongated frame with a center drive mechanism movably mounted on the frame intermediate the ends of the frame to accommodate variable length work pieces. The center drive mechanism provides opposing drive spindles independently driven to engage a pair of work pieces at one of their ends and drive them thereby. A pair of tail stock spindles are movably mounted and adjustable at the ends of the frame and have air operated cylinders to drive the spindles into engagement with the other ends of the work pieces. A screw operated platform is power driven by a screw to drive longitudinally along the length of the frame.

Abstract: In a two-axis turning machine, the cutting tool unit machines a first diameter of a workpiece portion of barstock extending from a main spindle chuck. A special subspindle chuck rotating in the same direction advances axially, grasps the workpiece as it is cut off from the barstock, and retracts. The barstock is fed through the first chuck for subsequent first operation machining and located against a stop which is independent of the tool slides. The subspindle chuck rotation is reversed, displacing the first-generated workpiece axis from the subspindle axis, and a second diameter, eccentric to the first diameter, is formed by the cutting tool unit in a second operation.

Abstract: The invention relates to improvements in the multiple spindle rotary indexing machine tool systems of the prior art. Traditionally, such machine tool systems include a base and an upstanding vertical column which houses a plurality of machining stations each equipped with two-axis tool slides. In addition, the base supports a rotatable worktable, which carries a number of work-holding spindles. As the worktable rotates, these spindles are indexed through successive machining stations where a variety of operations are performed. In accordance with the invention, a spindle position measurement unit is provided to dynamically measure the exact location of each spindle indexed to position at a modified machining station. A computerized numerical control system calculates spindle position errors based on the position information provided by the measurement unit and offsets tool slide position commands to compensate for those errors.

Abstract: A turret-type machine tool has a workpiece support that can be indexed incrementally by a step-drive and is locked to be stationary in angular positions corresponding to individual machining stations. In the individual machining stations, machining units are provided, each of them carrying a machining spindle. Workpiece holders are supported on the workpiece supports with planet axes located in at least one horizontal plane; the planet axes extend at a tangent to and radially spaced apart from the vertical switching axis of the workpiece support and are each aligned in pairs parallel to one another.

Abstract: An automatic programming system is provided for a lathe which has more than one spindle. The system has one program which controls the machining processes which are performed using the spindles. The same program also controls a process which transfers a workpiece between the spindles. Additionally, the programming system is able to relocate the origin of a coordinate system used as a reference for the machining based on data relating to the length of the workpiece and the distance between the chucks of the spindles.

Abstract: A device for machining a plurality of workpieces. The device having a plurality of identical independent machining assemblies attached on a rotating carousel plate such that one operator can unload and load a workpiece at one machining assembly while the other machining assemblies are machining the workpiece therein such that when a machining assembly returns from rotation on the carousel plate it is finished machining.

Abstract: An automatic lathe having two workpiece spindles each provided with a workpiece clamping device and arranged with coaxial spindle axes. At least one of the workpiece spindles is arranged on a slide guided for displacement in the direction of the spindle axis and displaceable in the direction of the spindle axis by a drive element and a coupling device between the drive element and the slide. In order to compensate for axial movement component of the clamping device during clamping, the coupling device is designed such that in a first condition thereof, the slide is freely displaceable relative to the drive element in the direction of the spindle axis and opposite to the axial movement component of the clamping device. In a second condition of the coupling device, the slide is not displaceable relative to the drive element in the direction of the spindle axis.

Abstract: A dual roll grinder employs a first and second work station including a dual drive headstock disposed therebetween. A grinding assembly and the dual drive headstock translatably move along a bed to engage rolls in either of the two stations. This permits unloading and loading of a new roll in the station not currently active.

Abstract: A method and apparatus for rotary-cutting a timber to peel off a veneer by a cutting knife from the outer periphery of a timber while rotating the timber around its longitudinal axis. The timber is gripped at its two end faces by means of chucking pawls which are driven in rotation. The chucking pawls comprise a plurality of chucks which are different in radial position. The chucks grip the timber at the end faces thereof adjacent to the outer peripheral surface of the timber, and as the timber is cut by the knife and reduced in diameter so that the knife comes close to a presently outermost chuck, the outermost chuck is retracted axially away from the end face of the timber, and the next outermost chuck continues to grip the timber adjacent to the presently outer peripheral surface of the timber. For this reason, the gripping force by the chuck pawls, resisting the cutting force moment, can be made small, and the timber gripping is made reliable.

Abstract: In an automatic lathe, a rotatable turret head is supported on a cross slide arrangement for longitudinal and transverse movements with respect to a headstock spindle. At least one counter spindle, associated with the headstock spindle, clamps a workpiece to be severed from the workpiece rod material. The counter spindle and at least one tool holder are arranged on the turret head whereby either the Counter spindle or the tool holder can be moved selectively into alignment with the headstock spindle by the rotation of the turret head. Additional tool holders, disposed spaced and parallel to each other on an additional tool carrier, can be moved selectively into alignment with the counter spindle. At least one turret head tool holder is a multiple tool holder with a plurality of tool clamping devices arranged spaced and parallel to each other. In one turret head position, one tool clamping device is opposite the headstock spindle and the counter spindle is opposite one of the additional tool holders.

Abstract: The NC complex automatic lathe is provided with a main spindle receptive therein a workpiece for chucking the same such as to protrude a front end portion of the workpiece, and a main spindle base for supporting the main spindle rotatably around a center axis and displaceably in a lengthwise direction of the workpiece. A turret type tool slide is disposed in the vicinity of the front end portion of the workpiece. The turret type tool slide is displaced transversely toward the center of the workpiece. A plurality of tool slide members are arranged radially around the front end portion of the workpiece in a free space away from the moving area of the turret type tool slide such as to undergo displacements toward the center of the workpiece.

Abstract: A workstock forming apparatus and method for forming both ends of workstock blanks without the necessity of reversing the ends of the workstock blanks. The apparatus and method include a loading servo or cylinder for successively loading individual workstock blanks such as pipe nipple blanks onto a turntable which initially receives and positions a first nipple blank to be threaded on one end by a first threading spindle. The turntable then sequentially rotates back into alignment with the loading cylinder and successively receives additional nipple blanks, which are rotated in sequence with the turntable and first nipple blank for threading on one end by the first threading spindle, while the first and succeeding nipple blanks are sequentially linearly displaced in a guide on the turntable and the unthreaded ends of the first and succeeding nipple blanks are simultaneously threaded by a second threading spindle.

Abstract: In a combined working machine, a positional relationship between a machining position of a workpiece and a tool can be determined to an optional value by a combination of a slide amount of a carriage along a slant surface, a slide amount of a tool post along another slant surface, a pivot amount of a turret, and a rotational amount of a chuck of a headstock. That is, the tool of the tool post can be brought into contact with the workpiece from a slant direction, and a combined working including cutting by a cutting tool and drilling in a slant direction by a drill can be performed. Further, the tool of the tool post can be moved to the desired machining position of the workpiece from the slant direction, and thus the moving amount of the tool post in a vertical direction can be reduced to lower a height of a machine tool and to give stabilization thereto.

Abstract: A device for cutting the inner circumferential surface of a thick-walled small diameter pipe comprising a setting means for inserting a core bar having a cutting blade on one end thereof into a pipe to be processed, a rotating means for rotating said pipe to be processed set by the setting means about the axis thereof relative to said core bar, a feed means for cutting the inner surface of said pipe to be processed with said cutting blade while pulling the core bar which is securedly held at the other end thereof relative to said pipe to be processed, and a control means for controlling each of said means, providing a smooth high quality inner surface having excellent proof pressure against internal pressure.

Abstract: The present invention provide a workpiece exchanging system in a CNC lathe having two spindle heads. The workpiece is machined by a spindle head A (S1, S2), a spindle head B is moved toward the spindle head A while loading a servo motor controlling a feed axis for the spindle head B to a torque limit (S3, S4). An error (d) of the feed axis is detected when this movement is completed, and it is determined whether the workpiece is normally clamped by a chuck mounted at a spindle head (S5, S7). The workpiece is machined as it is in accordance with the error of the feed axis (S9), is machined after being moved by a coordinate corresponding to the error (S8), an alarm is displayed, and the CNC is stopped (S10).

Abstract: A lathe comprises at least one base unit which is constructed from two machine beds 4, 7. The machine beds are cast as a one-piece unit from reaction resin concrete and carry the bed guides 5, 8 for a spindle box 6 which is displaceable in the direction of the spindle axis 10 and a tool carrier slide 9 with a tool turret 3. The bed guides are at a right angle relative to one another. Each spindle box comprises a projection 15 which has the length of the displacement path of the spindle box 6 and penetrates through a dividing wall 16 at the front end of the displacement path which is arranged at a right angle to the spindle axis 10. The switching axis 11 of the tool turret 3 is arranged at an angle relative to the longitudinal direction of its bed guide 8.

Abstract: A process permitting a work to be machined alternately using two different spindles of a multi-spindle lathe is disclosed. A transfer process by which the work is transferred between spindles is further added to the automatic programming scheme. The automatic programming apparatus accepts the instructions and allows implementation through interpretation of the instructions and processing of data in the instruction and field and/or in a separate storage. Therefore, machining the work using two spindles and transferring the work enabled with a straightforward input that can be easily understood and through the use of a single program. Conventional machining can be effected without the programmer having to be constantly conscious of which head or spindle is being employed.

Abstract: An automatic precision lathe is provided with a rotating main spindle movable in its axial directions, a slide movable in directions perpendicular to the axial directions of the main spindle, and a first subspindle and a second subspindle provided on the surface of the slide which faces the main spindle. The first and the second spindle are moved together with the slide to be alternately aligned with the main spindle to held the tip portion and the largest intermediate portion of the workpiece, respectively. The automatic precision lathe machines a workpiece having an intermediate portion with the largest diameter very accurately at a high rotational speed and at a large feed.

Abstract: A multispindle lathe is disclosed which has an indexable drum including a plurality of main spindles. A secondary spindle opposes the main spindles so that it is coaxial with one of the main spindles at an indexed position. The secondary spindle is rotatable on a fixed axis and can be moved axially towards the main spindle. The rotation of the secondary spindle can be synchronized with the rotation of the main spindle so that both spindles can hold a workpiece. A cut off tool moves transversely to the spindles to cut the workpiece from bar stock which has been fed into the main spindle. After cut off, the secondary spindle moves away from the main spindle and a secondary tool moves transversely to the secondary spindle to machine the end of the workpiece which has just been cut off. Movement of the secondary tool and secondary spindle can be coordinated to form curves and tapered threads.

Abstract: The invention relates to a spindle drive controller for a machine tool such as a numerically controlled lathe of the two spindle type. According to the invention, a drive control unit is enabled to separately control the spindles, or jointly control both spindles simultaneously. A switchover unit controls whether one or both spindles is controlled, and changeover units are provided for selectively feeding back speed and position feedback signals from one or the other of the respective spindles, depending on which spindle is being driven at that time.

Abstract: A multispindle automatic lathe has a main shaft drive motor (M3) for driving spindles (13) via a driving power transmission system (2a, 12, 14, 15, 20, 21, 22, 27, 28, 31), a feed and index driving motor (M2) operating a low and high speeds in timed sequence for feeding a plurality of cross tool slides (16) via a feed driving system (3a, 61, 62, 64, 65, 67, 68, 69, 70) and indexing the spindle carrier (11) via an index driving system (62, 71, 72, 73, 74, 75, 76, 77), and a feed and index drive motor (M1) for feeding a plurality of end tool slides (18) via a feed driving system (4a, 18a, 78, 79).

Abstract: A machine tooling system is provided, comprising a tooling machine having a plurality of adjustable cutting units installed at various locations therein, a collet for holding a workpiece to be tooled, and a presetter machine for adjusting the adjustable cutting units to within prescribed specifications when the adjustable cutting units are detached from the tooling machine. Each of the adjustable cutting units may be precisely positioned to contact the workpiece to be tooled, and each is provided with an identification device attached thereto. The identification devices provide (i) location information identifying a particular location on the tooling machining for which the cutting unit is precisely adjusted and (ii) adjustment information including the adjustment parameters at which the adjustable cutting unit is preset. A cutting unit identification subsystem reads and stores the location information and the adjustment information provided by the identification devices.

Abstract: A linear motor piston turning and grooving machine (10) for turning non-round diameters and complex shaped pistons (W) in which a pair of oppositely facing CNC turning modules (14, 16) each are aligned with one of a pair of a vertical axis spindles (30, 32) having chucks (26, 28) for each piston (W). An overhead tailstock assembly (34, 36) is centered over each spindle (30, 32). A grooving mechanism (106, 108) is located to the rear of each tailstock assembly (34, 36) and includes a rocking support shaft (110, 112) for bringing tooling (114, 116) into engagement with the piston (W).

Abstract: A complex machine tool has a single frame having a chip collecting space at a center portion thereof, first and second spindle stocks on the frame, relatively free to move and drive in a Z axis direction and holding the chip collecting space therebetween, workpiece spindles on the spindle stocks free to rotate and drive and facing each other, and tool rests. The tool rests have turrets and can assume various kinds of movement. Complicated and varied types of machining can be performed combining the rotation control of the workpiece spindles and the spindle stocks.

Abstract: A multi-spindle automatic lathe (11) includes a spindle carrier (12) mounted freely rotatable in an indexing fashion relative to a head stock (13), a plurality of workpieces (W) supported in spindles (14) on the head stock and freely rotatably driven on the same circumference, a plurality of tool slides (15) and integral tool holders positioned around the spindle carrier (12), one tool slide and integral tool holder being provided for each of the spindles and arranged on the head stock (13) so that each tool (27) mounted on each tool holder (25) is; freely reciprocable in dual directions, one direction parallel with the axis of the spindle and the other direction normal to that axis, for processing a workpiece.

Abstract: A method of machining cylindrical workpieces, mainly cylindrical metallic workpieces such as cylindrical separate metallic workpieces and sequentially fed bar-like workpieces, into cylindrical products such as bearing outer and inner races and valve spools, by employing a bi-spindle numerically controlled machine tool provided with two parallel spindles capable of holding and rotating workpieces, respectively, and a single tool block unit capable of moving in two mutually orthogonal directions under the control of a numerical controller in accordance with a numerical control program, to precisely feed two separate groups of cutting tools mounted thereon and thereby accurately cut the rotating workpieces on the two parallel spindles alternately or simultaneously at a high production rate.

Abstract: A complex machine tool has a single frame having a chip collecting space at a center portion thereof, first and second spindle stocks on the frame, relatively free to move and drive in a Z axis direction and holding the chip collecting space therebetween, workpiece spindles on the spindle stocks free to rotate and drive and facing each other, and tool rests. The tool rests have turrets and can assume various kinds of movement. Complicated and varied types of machining can be performed combining the rotation control of the workpiece spindles and the spindle stocks.

Abstract: An attachment assembly for a multi-spindle screw machines which provides positive part recovery and increased back-machining capabilities. The attachment is fully integrated in the host multi-spindle machine to complete cut-off, back-machining operations, and part recovery within the cycle time of the host machine. The configuration and construction of the attachment assembly provides reliable operation with minimum adjustment and simplified trouble-shooting through a central processing display panel. The integration of the components also simplifies tool changes and adjustments for production of different parts. As a result, the cut-off and back-machining are accomplished within the limited cycle time of the multi-spindle machine while recovery of the finished part ensures diversion to the proper storage bin prior to return to the start position to pick-off the next production part.

Abstract: In machining a blank material on an automatic lathe of the type having first and second headstocks slidably carried along a bed, the first and second headstocks are slidable along their respective machining axes, and the first headstock grips the blank material to take a front machining, whereupon the semi-machined blank material, i.e., a workpiece is transferred to the second headstock to take a rear machining. The lathe also has first and second guide bushes for intermediately guiding the workpiece near the working point while the workpiece is gripped by the first and second headstocks. For machining a blank material in the form of a cylindrical rod continuously, the entire machining cycle can be divided into the front and rear machinings. Thus it is possible to shorten the machining cycle period.

Abstract: A method of simultaneously cutting the surfaces of a set of a plurality of rolls made flush with one plane, disposed at equal angular intervals, and forming a central caliber therebetween, by means of a cutter provided with cutting tools in the same number as that of the rolls. The cutter holds the cutting edge of the cutting tool in parallel with the cutter shaft and adapts the cutting edge to face the just front side of one of the rolls for the purpose of cutting. In cutting, in addition to the movement of the cutter in the axial direction Z and circumferential direction .theta., the cutting tool moves in the radial direction R of the cutter shaft. Thus, the cutting edge 21a' is kept facing the roll shaft at right angles all the time in spite of positional change in the circumferential direction .theta., whereby simultaneous and continuous shaping of not only the caliber surface but also round parts 10b on both sides of the shoulder and 120.degree. surface is made possible.

Abstract: The present invention relates to a numerically-controlled lathe, a numerically-controlled device therefore and a procedure for processing a workpiece thereby. An object of the invention is to provide a numerically-controlled lathe adapted to designate one of two spindles and three tool rests and a procedure for processing a workpiece thereby.

Abstract: A CNC lathe comprising two opposed spindle stocks (2a, 2b) and two turret type tool rests (3a, 3b), in which a base (1) is of a slant type, the first spindle stock (2a) is secured to the base (1), the second spindle stock (2b) is provided to be capable of being moved and located only in a direction to the spindle, and both the tool rests (3a, 3b) are arranged in the deep side of the spindle stocks (2a, 2b). The CNC lathe having said construction in which both spindle stocks include an independent spindle motor (21), a spindle indexing and driving device (23) capable of mechanically releasing connection, and encoders (27, 26) on the side of the spindle, and the indexing and driving device wherein an index motor (40) is rotated on the basis of a phase difference detected by the encoder to match a phase when the spindle indexing and driving device (23) is connected to the spindle 11), so when a work (16) is delivered between both the spindles (2a, 2b).

Abstract: In order to so improve a bar stock feeding means for machine tools comprising a longitudinal guide means on which several holders which each receive the bar stock in a guide means are held for movement in the longitudinal direction of the longitudinal guide means, and a drive means with which the holders are displaceable from an initial position in which they exhibit a maximum spacing from one another in the longitudinal direction into an end position on the machine tool side in which they exhibit a minimum spacing from one another in the longitudinal direction, that it can be sturdily and structurally simply made, it is proposed that the longitudinal guide means comprise a guide element having a longitudinal thread, that the holders be held in parallel alignment with one another by threaded rings engaging the longitudinal thread, and that the holders be movable in the longitudinal direction between the initial position and the end position by a relatively rotation between the guide element and the threaded r

Abstract: A spindle apparatus for holding a workpiece for machining includes a stationary support structure and preferably multiple rotary spindle members for holding individual workpieces. Each rotary spindle member is mounted in a spindle carriage that is rotatably mounted to the stationary support structure. As the spindle carriage is rotated on the support structure, the spindle members move in an orbital path. A rotary indexing apparatus is provided for rotatably driving the spindle members and the spindle carriage. The indexing apparatus is connected to a transmission including a fixed center gear as well as planetary gears and spindle member drive gears for each spindle member. A piston assembly received in each spindle member engages and holds a distal end of the workpiece and allows for the axial advancing of any selected incremental length of the workpiece through the rotary spindle member for machining.

Abstract: A machine tool has a main slide movable along a first path and a cross-slide assembly movable perpendicular to the path of the main slide. The cross-slide assembly has a first slide unit which is directly driven by a primary servo control. The cross-slide assembly has a second slide unit driven by the first slide unit through a spring-loaded follower acting against a cam which can transmit numerically-controlled offset to the second slide unit such that both slide units will follow identical paths. The cam is adjustable to enable correction of the offset. Each slide unit carries a cutting tool. The invention is applicable to multiple spindle machines having two or more spindles.

Abstract: In order to improve a multiple-spindle automatic lathe comprising a working area, a spindle drum having several spindles in different spindle positions, the spindles being adapted to be brought into different spindle stations on a machine frame by rotation of the spindle drum about a spindle drum axis, a bar stock feed means associated with at least one spindle, and a stop arranged in the working area and having a stop surface for bar stock, such that the stop can be arranged so as to save more space, it is proposed that the stop be mounted for rotation concentrically with the spindle drum axis, and that the stop be fixable relative to the spindle drum during bar stock feed in an initial position in which the stop surface intersects a feed direction of the bar stock located in the spindle position associated with this initial position.

Abstract: A complex machine tool has a single frame having a chip, collecting space at a center portion thereof, first and second spindle stocks on the frame, relatively free to move and drive in a Z axis direction and holding the chip collecting space therebetween, workpiece spindles on the spindle stocks free to rotate and drive and facing each other, and tool rests. The tool rests have turrets and can assume various kinds of movement. Complicated and varied types of machining can be performed combining the rotation control of the workpiece spindles and the spindle stocks.

Abstract: In a method and a multiple-spindle automatic lathe for machining both sides of workpieces, in order to increase the number of spindle positions available for machining the workpieces, it is suggested that the spindle drum be indexed in single steps, that the feeding of raw workpieces, the removal of finished workpieces and the changeover of half-finished workpieces be carried out in a single spindle position of the spindle drum and that the feeding of raw workpieces and the removal of finished workpieces occur alternately after each drum indexing.

Abstract: A workpiece machining system for simultaneously machining the opposite surfaces of workpieces such as discs for disc brakes includes at least two machining apparatus disposed on a workpiece transfer path between a first workpiece inlet conveyor line and a second workpiece outlet conveyor line, for machining respective workpieces while holding and rotating the workpieces in the same attitude as that in which they are conveyed along the first and second conveyor lines. The workpiece machining system also includes a transfer apparatus for transferring the workpieces from the first conveyor line through the machining apparatus to the second conveyor line while maintaining the workpieces in the same attitude.

Abstract: In order to improve a machine tool with a motor spindle, including a main motor integrated into a work spindle coaxially with the spindle axis, the main motor, for its part, comprising a rotor and a stator, and with a cooling device for supplying cooling surfaces of the main motor with a gaseous coolant, so that simple and effective cooling of the main motors of the motor spindles is possible, it is proposed that the stator be comprised of stator plates which, for their part, form cooling surfaces, and that the gaseous coolant be conducted directly along the cooling surfaces of the stator plates.

Abstract: A machine tool having the first and second spindle stocks being relatively movable in Z axis direction in the shape of facing to each other and workpiece spindles provided rotatably through which a workpiece can be held by those spindle stocks.Machining in the first spindle stock is performed on a basis of the machining coordinate system set relating to the first spindle stock according to the first offset value and machining in the second spindle stock is performed on a basis of the machining coordinate system relating to the second spindle stock set by computing on a basis of said first offset value or the second offset value.

Abstract: A clamping mechanism is provided to prevent movement of the rotatable stock carrier of a multiple spindle bar machine after it has rotated into position for the machining operation. The clamping mechanism comprises a controllable locking pin to engage indexing pin slots on the stock carrier, a passive pressure brake located opposite the locking pin, and a hydraulically actuated pressure brake in the same quadrant as the locking pin. The hydraulically actuated brake clamps the carrier against the passive brake, and in combination with the locking pin holds the carrier against movements caused by the forces of the machining tools. The hydraulic brake is released by a programmable controller to allow intended rotation of the carrier to a new position.

Abstract: In a remaining bar material machining method, a plurality of works are taken from a continuous bar material on an NC lathe, and the remaining portion left at the end of the bar material is machined effectively. In the lathe in which both first and second headstocks are axially movable along the bed, the continuous bar material can be continuously machined with efficiency. At that time, to utilize the remaining portion left at the end of the bar material effectively without discarding it, this remaining bar material is transferred to the second headstock. An NC controller includes a main machining program and a remaining bar material machining program; when the remaining bar material has been transferred to the second headstock, the remaining bar material machining program is executed instead of the main machining program having hitherto been executed. During machining the remaining bar material on the second headstock, the first headstock is waiting in readiness for the machining of the next bar material.