Abstract: A method for manufacturing a hydro dynamic bearing device is provided. This method is capable of sufficiently increasing a circumferential speed at the time of grinding an axial member which is a structural component of the hydro dynamic bearing device, and also capable of preventing the generation of centrifugal whirling to improve the grinding efficiency and working efficiency while improving the quality of the product. The axial member as one of structural component of the hydro dynamic bearing device is supported at both ends thereof with a pair of plate members in a face-contact manner, while rotating the axial member around its axial center. The outer peripheral surface of the axial part of the axial member is ground on a grindstone while supporting the outer peripheral surface of the axial part with a supporting member.

Abstract: A cutting tool assembly for machining a turbine component includes a substantially solid toolblock body, a blade sub-assembly, a cutting insert, and a lead screw. The toolblock body includes a centerline axis. The blade sub-assembly is slidably retained adjacent said toolblock body and a cutting insert is attached to the blade sub-assembly. The lead screw coupled adjacent to the toolblock body such that the lead screw is substantially perpendicular to the centerline axis. The lead screw is rotatably coupled to the blade sub-assembly such that rotation of the lead screw extends the blade sub-assembly from the toolblock body.

Abstract: Disclosed herein is a workpiece holder for use with a rotatable lathe assembly. The workpiece holder comprises a housing with a base and two upwardly projecting outer sides. The first section is adapted to receive a workpiece to be machined and support the workpiece during the machining process. The support provided by the first section minimizes deflection of the workpiece and enhances the machining process.

Abstract: A stabilizer is disclosed, for suppressing vibrations and whip during the machining long cylindrical work pieces. A mover causes arms to move away from the work piece when the mover is retracted and to move towards the work piece when the mover is extended. The positioning of links and pivots enables the arms to be moved a significant distance when the mover is moved a short distance and thereby permits the use of the stabilizer between a guard and the path of movement of the work piece. The mover is provided with adjustments for changing the force with which the mover acts and to adjust the force applied to the work piece.

Abstract: A lathe assembly having a guide with a passageway for movement of a piece of bar stock, with a leading end and a trailing end, in a substantially straight path between a feeding position and a working position. A sensor assembly is capable of detecting the position of the trailing end of a piece of bar stock within the guide passageway to thereby allow a user to determine if a piece of bar stock in the guide passageway has a length sufficient to perform the desired operation thereon. Also, a method of using the lathe assembly.

Abstract: An improved collet assembly made adaptable for use in a computer numerical controlled (CNC) machine as well as in a non-CNC type of machine having one or more sub-spindles adaptably configured to accept and receive the collet assembly. The collet assembly generally comprising a collet body geometrically configured to accept and house a plunger assembly comprising a plunger cylinder integrally attached to a plunger rod having one end threadably attached to an ejector tip and a second end slidably engaged to a plunger retainer and fitted with biasing means, all of which serving as means to hold a workpiece during machining thereof and eject the workpiece from the collet body as biasing means advances forward within the collet body to a fully extended state.

Abstract: A workstation is provided for concurrently processing dynamo-electric machine core subassemblies that are at different stages of a dynamo-electric machine core manufacturing process. The workstation is configured to include a sequence of step processing units. Different units receive and process subassemblies that are at different stages of manufacture. A movable transferor substantially simultaneously advances a group of subassemblies forward through the sequence of units. The workstation can be integrated with conventional assembly line transport systems. These transport systems may be used to deliver input subassemblies to the workstation and to carry away output subassemblies. Subassemblies may be loaded into the workstation at the same time as finished subassemblies are unloaded from the workstation.

Abstract: The bar supporting apparatus (10) relates to an apparatus which is installed to be continuous to the main spindle (50) of the automatic lathe at the rear thereof and prevents the rotating bar (17) held by the chuck (51) of the main spindle (50) of the automatic lathe from oscillating to support the bar (17) so as to allow smooth rotation. The bar supporting apparatus (10) includes: the case (11); the fixing member (15) fixed on the external surface of the case (11); and the support (13) attached to the fixing member 15 to support the bar (17) in the case (11). The through hole into which the support (13) is inserted is formed on the side surface of the case (11). The fixing member (15) for fixing the support (13) is fixed on the external surface of the case (11) with the support (13) being inserted into the case (11) from the through hole.

Abstract: A device and method for measuring deviations in shape of a generally cylindrical workpiece is disclosed. The device enables measurement of a number of shape-defining parameters while the workpiece is positioned in a machine tool, so that the workpiece does not have to be removed from the machine tool in order for the measurements to be taken. A steadying rest, for use on machine tools to hold a workpiece, especially one having a longitudinal central axis that is rotationally unsymmetrical or unstable with respect to the machining tool, in position to enable measurement of the shape defining parameters and shape deviations while the workpiece is mounted on the machine tool, is also disclosed.

Abstract: In a vertical lathe of an open side column type, a pair of linear guides (65,66) arranged in parallel in a cross rail (62), and a space portion (67) is formed between them (65,66). A saddle (90) is supported by the linear guides (65, 66) above the space portion (67) and moved in an axis direction (X axis). A ram (120) is suspended through the space portion (67) and moved in a vertical direction (X axis). A rotary driving disc (34) fixed on the table rotation driving shalt (33) is connected to a rotary table (30) by plural torque transmission pins (37) in torque transmission relationship. Thereby, the rotary table (30) rotates in carrier method. A tool holder (151) is rotatably driven at an optional angle position (B axis position) by a B axis servomotor (163) about a horizontal axis. The tool holder (151) is clamped at an optional rotation angle position by a thrust static pressure bearing under oil-pressure supply to one of thrust static pressure portions.

Abstract: A lathe assembly having a guide with a passageway for movement of a piece of bar stock, with a leading end and a trailing end, in a substantially straight path between a feeding position and a working position. A sensor assembly is capable of detecting the position of the trailing end of a piece of bar stock within the guide passageway to thereby allow a user to determine if a piece of bar stock in the guide passageway has a length sufficient to perform the desired operation thereon. Also, a method of using the lathe assembly.

Abstract: A locator with a part support is used to hold a part onto the kinematic mount of a tooling machine so that the part can be held in or replaced in exactly the same position relative to the cutting tool for machining different surfaces of the part or for performing different machining operations on the same or different surfaces of the part. The locator has disposed therein a plurality of steel balls placed at equidistant positions around the planar surface of the locator and the kinematic mount has a plurality of magnets which alternate with grooves which accommodate the portions of the steel balls projecting from the locator. The part support holds the part to be machined securely in place in the locator.

Abstract: The “Barfield Non-Slip Spur” has the unique recessed chamber compartment that allows for stock to be inserted into the chamber for holding prior to the turning process. This feature does not allow slippage, boring, or splitting of the stock.

Abstract: A facedriver for holding a workpiece along the axis of a rotary-drive machining device, including a base member, a forwardly-biased centerpoint member, drivepins supported rearwardly by fluid in a fluid-containing chamber in the base member, a grip member contacting the centerpoint member, and a grip portion of the fluid chamber adjacent to the grip member for fluid contact therewith such that varying fluid pressure caused by loading force on the drivepins causes application of varying radial gripping force on the centerpoint member through the grip member.

Abstract: The present invention provides a method and article involving a onepiece, unibody spindle liner having a tubular shape with an outside diameter and inside diameter that may be sized to fit virtually any spindle of a turning machine and to readily allow for the feeding therethrough of any size or shape of bar or tube stock. This invention provides that the axial centerline of the workpiece is maintained in concentric axial alignment with the working centerline of the turning machine to reduce wobble or “whip” of the stock during the machining process. The liner's inner bore and diameter is molded to match and allow for feeding of virtually any size and shape stock being turned, including but not limited to round, hex, square, and extruded. The inner bore is molded into the spindle liner along its entire length providing absolute support of the workpiece. The spindle liner also has a flanged mounting end to allow for the proper orientation and attachment to the spindle.

Abstract: A tube squaring machine having an improved feed means and an improved monobloc collet for clamping a workpiece to be machined. A collet mount containing the monobloc collet is mounted on a housing connected to a motor means having a rotatable shaft with a machine tool mounted thereon and positioned relative to the collet to engage tube or workpiece held in the collet.

Abstract: A lathe assembly having a guide with a passageway for movement of a piece of bar stock, with a leading end and a trailing end, in a substantially straight path between a feeding position and a working position. A sensor assembly is capable of detecting the position of the trailing end of a piece of bar stock within the guide passageway to thereby allow a user to determine if a piece of bar stock in the guide passageway has a length sufficient to perform the desired operation thereon. Also, a method of using the lathe assembly.

Abstract: A sprocket wheel or double helical gear loader for a machine which generates gears by pinion shaped cutters. The machine includes a gear bearing table having a centering device and a rotatable supporting base. The loader includes a turntable which advances step-by-step about an axis of rotation of the base. The turntable includes on its periphery a plurality of gear holders, which can be intermittently positioned at cutting stations and a discharge station of completed gears. A gear is secured to the turntable through gripping arms, which surround the gear about a whole of the gear perimeter except for an aperture. A cutter passes through the aperture. The gripping arms are movable to accommodate gears of different sizes.

Abstract: A universal machine tool having a machine tool column shiftable on a machine bed along a first horizontal axis by means of a motor, and a tool slide shiftable on the machine tool column along a vertical axis, also by means of motor. The machine tool has a rotatably driven work spindle, and a workpiece slide shiftable on the machine bed along a second horizontal axis perpendicular to the first horizontal axis and comprising a workpiece table for the workpieces to be machined. For enabling multi-axis machining with a single mounting operation and a facilitated chip removal, the workpiece table is arranged on the workpiece slide so as to be pivotable between a horizontal and a vertical position.

Abstract: Apparatus for machining workpiece made of an explosive material, the apparatus including: a drive system and a cutting tool assembly for cutting a workpiece made of an explosive material; an elongate member carried by, and projecting along an axis from, the drive system for holding the workpiece at a machining location while being rotated about the axis by the drive system; and a first shield element interposed between the machining location and the drive system for protecting the drive system against damage in the event of explosion of the workpiece.

Abstract: A machine tool has a vertical-axis tool spindle that receives a tool, and a workpiece table on whose upper side is arranged a fixture for clamping in a workpiece. The tool spindle and workpiece table are displaceable relative to one another in a working region in which the workpiece is arranged. The working region extends at least partially, in a direction transverse to the spindle axis, outside the workpiece table; the fixture projects in that direction beyond the table, holds the workpiece there, and is open at the bottom so that chips that are produced can freely fall downward in the direction of the spindle axis.

Abstract: The devices guides a bar that is advanced by the retractable collet of a bar feeder magazine to the mandrel of a lathe by employing an insert which is slidable with slight clearance within a duct that is connected to the mandrel. The insert has therethrough an axial passage registering at one end with an inlet end of the duct, which is disposed to receive the bar and collet, and the opposite end of the passage designed to be traversed by the bar with slight clearance. The insert is disposed to be engaged and impelled by the advancing collet along the duct a predetermined distance towards the mandrel, after which means is provided to engage and effect return of the insert to a starting position close to the inlet end of the duct upon re-extraction of the collet from the duct.

Abstract: A part clamping fixture assembly for locating and holding a knuckle/hub assembly, including a knuckle, a wheel hub and a bearing, for final finishing of a flange face of the wheel hub includes a top portion, a first housing portion, and a second housing portion. The first housing portion is intended to engage a first appendage of the knuckle and the second housing portion is intended to engage a second appendage portion of the knuckle. The fixture assembly also includes a puller member having an upper end for communicating with a drive mechanism in order to rotate the knuckle/hub assembly and a lower end opposite the upper end. An encasing is disposed around the puller member and has a lower portion for contacting the bearing.

Abstract: Methods and apparatus for machining highly concentric surfaces on a workpiece. In a pre-operation, locating features are machined into either end of a workpiece. These locating features are subsequently pulled apart so as to induce tension in the workpiece. In the state of tension the workpiece is rotated and one or more diameters are machined onto the workpiece.

Abstract: A method of repairing a drill pipe having first and second connector ends, each of the first and second connectors ends including a threaded portion and sealing portions, with a lathe having a chuck with longitudinally spaced first and second sets of jaws, the method comprising the steps of mounting the drill pipe in a lathe, gripping the first connector end of the drill pipe with each of the first and second sets of jaws, orienting the first connector end by manipulation of the first and second sets of jaws into a working position; and rotating the drilling pipe against a working tool to machine the threaded portion and sealing portion of the first connector end and produce a new threaded portion and sealing portion of the first connector end. A lathe with longitudinally spaced first and second sets of jaws is also disclosed. A device for positioning of subsequent workpieces without repeating alignment steps is also disclosed.

Abstract: A toolholder apparatus includes a head, a cutting tool mounting fixture attached to the head for holding the cutting tool, and a floating roller assembly pivotally mounted relative to the head. These components are arranged and constructed so that during the cutting of a workpiece with the cutting tool the floating roller assembly can pivot about a pivotal axis relative to the head to allow the floating roller assembly to align with the workpiece. A mechanism is also provided for accomplishing the initial adjustment of alignment of the cutting tool with the rotating workpiece. This mechanism includes a cylindrical shaft extending from the head, and having an eccentric cam follower lug extending transversely from the shaft. A mounting block has a cylindrical bore disposed therethrough, and the shaft is received through the bore of the mounting block. A cam piece is slideably disposed within the mounting block to rotate the shaft as the cam piece slides relative to the mounting block.

Abstract: A method of drive decoupling, and a drive decoupling device, utilized in connecting a driving member to a driven members that is attachable to a workpiece to be rotated about a drive axis, includes a laminated plurality of flexible sheet material, attached to the driving member by at least one off axis connection and to the driven member by at least one other off axis connection circumferentially spaced from the one off axis connection, and which is torsionally rigid in a plane perpendicular to the drive axis so as to accommodate any eccentricity developed through misalignment of the driving member and driven member. The coupling device is centrally apertured so that a headstock can extend therethrough. A pair of drive decoupling devices are also provided in series by connecting the driven member of one to the driving member of another.

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 centering spindle for use with a workpiece which is to be induction hardened includes a generally cylindrical outer housing into which a shaft is positioned and mounted in spaced relation to the housing by a bearing arrangement. The bearing arrangement allows the shaft to rotate relative to the housing. The end of the shaft extending out of the housing is connected to an isolation spacer which is fabricated out of an electrical insulator material. The isolation spacer in turn is attached to a removable tip which is constructed and arranged for interfacing with the workpiece to be induction hardened. The design of the centering spindle is such that the tip may be removed and replaced when it becomes worn without the need to replace any of the other parts or components of the centering spindle. Further, any electromagnetic field induced in the workpiece and transmitted to the tip will not be transmitted to the shaft nor to the bearing arrangement due to the isolation spacer.

Abstract: A grinding support for supporting a workpiece, such as a pin member, during a process of grinding the workpiece. The support particularly supports the workpiece in a stable position during grinding so that larger grinding "cuts" can be taken, thereby speeding the process. In addition, the positioning of the support can be precisely controlled to ensure a consistent grind along the length of the workpiece. The grinding support may be used in a grinding support assembly in which a workpiece is supported at one end thereof by the aforementioned support, and at another end by a known type of support, the latter preferably being rotatable, whereby the workpiece can be rotated during the grinding process.

Abstract: A device for guiding a bar at the outlet of a lathe feeder, particularly of an automatic lathe, comprising: a tubular body, which is fixed to the outlet of the feeder coaxially to the rotation axis of the bar; and a plurality of circular annular elements, which are mutually adjacent and lie on planes which are perpendicular to the bar rotation axis and are articulated inside the tubular body about axes which are angularly distributed around the axis and so that the center of the elements can oscillate along a circular path which passes through the axis; the elements have respective arms which protrude outside the tubular body through slots of the body and are articulately coupled to a sleeve which is supported so that it can rotate on the tubular body; the sleeve is controlled by an actuation which turns it in both directions, so as to produce an oscillation of the elements in a position which forms a passage for the bar which is delimited by portions of the circular annular elements.

Abstract: A shave tool holder having a body, a platform base and a vertically extending superstructure. An elongate shank portion extends from the body and mounts the body to a holder block. The holder block is reciprocally actuated in a horizontal direction in combination with being pivotally actuated in a vertical direction. A cutter insert is releasably secured upon the platform base. A roller is mounted to a support portion which is in turn secured to the vertically extending superstructure. The roller and support portion are capable of being vertically actuated up and down along the superstructure by a bolt. The enlarged head portion includes a plurality of radially outwardly extending markings corresponding with a circumferential array of the enlarged head portion.

Abstract: A hollow shaft is manufactured by defining a through hole axially in a shaft blank to produce a cylindrical hollow shaft blank, inserting a mandrel in the through hole of the hollow shaft blank, holding opposite ends of the mandrel concentrically with the through hole, and rotating the hollow shaft blank about its own axis while cutting an outer circumferential surface of at least one end of the hollow shaft blank concentrically with the through hole to form a reference outer circumferential surface on the at least one end of the hollow shaft blank. After the reference outer circumferential surface is formed, it is held in position, and the hollow shaft blank is rotated about its own axis while cutting a predetermined thickness of an outer circumferential surface of the hollow shaft blank over a substantially entire length thereof for thereby finishing the hollow shaft blank into a hollow shaft.

Abstract: A vertical machine tool with a movable main spindle has a headstock for supporting a spindle having an axis in a vertical direction. A work feeder gives and takes a work between the work feeder and a chuck. The work feeder includes a work feeder frame provided in the vicinity of a machine body, a swivel member driven by a driving means for swivelling, a plurality of pallets mounted on the swivel member, and a supporting device disposed in a work receipt/release position where the pallet is positioned for receiving/releasing the work between the pallet and the chuck. The supporting device supports the pallet, positioned in the work receipt/release position, movably up and down in the direction of the axis of the spindle. The receipt/release of the work may be performed under the condition that the work is kept depressed to the chuck.

Abstract: A toolholder apparatus includes a head, a cutting tool mounting fixture attached to the head for holding the cutting tool, and a floating roller assembly pivotally mounted relative to the head. These components are arranged and constructed so that during the cutting of a workpiece with the cutting tool the floating roller assembly can pivot about a pivotal axis relative to the head to allow the floating roller assembly to align with the workpiece. A mechanism is also provided for accomplishing the initial adjustment of alignment of the cutting tool with the rotating workpiece. This mechanism includes a cylindrical shaft extending from the head, and having an eccentric cam follower lug extending transversely from the shaft. A mounting block has a cylindrical bore disposed therethrough, and the shaft is received through the bore of the mounting block. A cam piece is slideably disposed within the mounting block to rotate the shaft as the cam piece slides relative to the mounting block.

Abstract: A CNC machine tool has a plurality of collet chucks in a fixture that requires loading workpieces in these collets by hand. The workpieces are first assembled on a loading bar or holder so they can be collectively loaded in the ganged collet chuck for machining in the CNC machine. The holder has spaced stations, and each station includes a standard base adapter and an individualized parts adapter that fits onto the base adapter. Each parts adapter will be configured to accept a part to be machined.

Abstract: An apparatus for gripping a bar supported for rotation by a numerically controlled lathe. The apparatus contains two jaws and a gripper cam pivotally attached to each jaw; springs attached to the jaws tend to rotate the gripper cams away from the jaws. A device is provided for moving the jaws together, moving the jaws apart, and locking the jaws into a fixed position.

Abstract: A cutting-off method of an automatic lathe, comprising steps of applying a front working to a bar material by a front working tool with the bar material chucked by a main spindle rotatably supported by a headstock and with a top end of the bar material supported by a guide bush, applying a cutting-off by a cut-off tool after completion of the front working with the top end of the bar material chucked and rotatively driven by a sub spindle rotatably supported by a rear headstock, and simultaneously releasing the bar material chucked by the main spindle so that the headstock may rearwardly move to a working start position to be ready for the next working.

Abstract: A draw tube adaptor for insertion into the draw tube of a lathe. The draw tube adaptor includes a sleeve, and carried within the sleeve are a series of bushings spaced apart from one another. The bushings have bores sized to accommodate the diameter of the stock to be worked, and are maintained in a spaced apart relationship by cylindrical spacers carried within the sleeve. These spacers space the bushings at desired locations throughout the length of the sleeve. A cap arrangement is provided on the sleeve to retain the cylindrical spacers and bushings within the sleeve.

Abstract: A centering device for rods fed to a lathe is designed to be arranged between a rod feeder outlet and a lathe inlet and comprises at least one centering unit (11) having a passage port therein to be run through by a rod to which it supplies lateral containment. The centering unit (11) comprises a first (14) and a second (15) sectors superimposed with each sector having a passage (16 or 17) therein. Linkage actuators (18,19) operable to move the superimposed sectors to change the superimposed quantity of the passages (16,17) therein and thereby the rod passage port.

Abstract: The spindle supporting head of a multiple spindle screw machine is intermittently rotated to place its spindles into successively different angular positions about the axis of a spindle drive shaft which extends coaxially into the center of the head. When each spindle is rotatably indexed into a particular angular position, a piece of bar stock is fed through the spindle and projects beyond one end thereof. Each of a plurality of tool slides, which are mounted adjacent the end of the head from which the spindle projects, carries a tool which registers with the stock projecting from an adjacent spindle. The slides are connected to servo motors which are operable by an associated computer to move their tools toward and away from the stock projecting from the associated spindles. Normally the head is secured against rotation by a hirth ring which intermittently is moved from its locking position to release the head so that it can be rotatably indexed.

Abstract: A self-centering steady of the closed type includes a housing (H), an actuator (14), a center gripping arm (11) and a pair of side gripping arms (12, 13) intended to grip a workpiece (P) under the action of the actuator (14). The actuator is provided with cam surfaces (31, 32) for engaging the side gripping arms (12, 13) in order to cause the workpiece engagement and/or disengagement movements. Each side gripping arm (12, 13) is connected to the actuator (14) and is slidably received in a rotating element (26) provided in the steady housing (H). The center gripping arm (11) is slidably received in a slide guide (G) provided in the steady housing (H). The rotating elements (26) together with the side gripping arms (12, 13) and with the center gripping arm (11) form a closed structure which prevents dust and scraps from entering the steady housing (H), both with the gripping arms (11, 12, 13) in the retracted and in the extended positions.

Abstract: The body section of the holder carries at one side a shaving tool bit and work supporting roller, and is removably mounted at its opposite side on the slide section of the holder by a quick release pin, which is reciprocable in a bore in the slide section. A spring normally urges the inner end of the pin into an opening in the body section to prevent its removal from the slide section, but to permit limited floating movement of the body section relative to the slide section. The pin may be retracted manually to allow removal of the body section. The work supporting roller is also removably and adjustably mounted on the body section; and the slide section is adjustably supported on an adapter to be mounted thereby on a machine cross slide. Two sets of ball bearings are interposed between the body and slide sections to facilitate floating movement of the former on the latter.

Abstract: An attachment for a lathe which allows for the precise machining of thin elongated workpieces. The attachment includes a guide bushing which maintains the axial position of a workpiece against radial forces applied thereto by cutting tools. During a cutting operating, the guide bushing moves along the workpiece together with the cutting tools. The attachment can be used in conjunction with a variety of machining lathes.

Abstract: The body section of the holder carries at one side a shaving tool bit and worm supporting roller, and is removably mounted at its opposite side on the slide section of the holder by a quick release pin, which is reciprocable in a bore in the slide section. A spring normally urges the inner end of the pin into an opening in the body section to prevent its removal from the slide section, but to permit limited floating movement of the body section relative to the slide section. The pin may be retracted manually to allow removal of the body section. The work supporting roller is also removably and adjustably mounted on the body section; and the slide section is adjustably supported on an adapter to be mounted thereby on a machine cross slide. Two sets of ball bearings are interposed between the body and slide sections to facilitate floating movement of the former on the latter.

Abstract: A support structure for laterally supporting a workpiece in a vertical lathe so as to hold the axis of the workpiece aligned with the vertical support axis of the lathe. The support structure includes a rod which is vertically supported on the lathe. The rod supports a movable locator rest assembly. The locator rest assembly includes a horizontally extending rod which terminates in a part rest which can be positioned so as to engage and support the workpiece in a precisely vertical manner.

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: An adaptor for automatic CNC turning lathes equipped with radial jaw chucks and opposing sub-spindles capable of gripping and moving a workpiece longitudinally during the cutting operation, the adaptor comprising a guide collet mounted coaxially on the longitudinal axis of the feed bore of the lathe, the adaptor being mounted so as not to interfere with the radial movement of the radial jaw chucks, where the guide collet allows for longitudinal movement of the workpiece during the machining operation but prevents the workpiece from deviating out of axial alignment during rotation, such that the cutting operation is performed adjacent the guide collet to prevent deflection of the workpiece by the cutting bit.

Abstract: A centering device for use with a lathe having a bed, a head and tail stock for holding a work therebetween, a carriage reciprocally movable by a drive motor and a tool box includes a plurality of work rests disposed along the longitudinal direction of the lathe bed. Each of the work rests is movable between a first position for supporting the work and a second position spaced from the work. A control device is associated with the work rests for controlling movement of each of the work rests between the first position and the second position in response to the movement of the carriage and the control device operates to stop carriage movement so as to prevent collision with a work rest.

Abstract: A centering device includes a plurality of work rests disposed along the longitudinal direction of a bed of a lathe. Each of the work rests is movable between a first position for supporting a work and a second position spaced from the work. A control device is associated with the work rests for controlling movement of each of the work rests between the first position and the second position in response to the movement of a carriage.