Abstract: A tailstock includes a main body, a lathe center unit arranged in a hollow hole of the main body, a sliding base coupled with the main body and having a slider configured at a side thereof for pairing a slide rail, and a clamping unit configured in the sliding base. The clamping unit for increasing clamping force of the tailstock further includes a connection plate having at least one positioning hole to connect the main body, at least one hydraulic rod bridging the slider and the main body, a plurality of loading devices ring-set about the hydraulic rod, and a plurality of sleeves ring-set with the corresponding loading devices.

Abstract: An apparatus for machining an elongated workpiece with a tool a support column having a generally planar and vertical front wall and a pair of generally planar, parallel, and vertical side walls projecting rearward from respective outer edges of the front wall. A workpiece holder on the front wall can hold the workpiece forward of the front wall in a vertical orientation. A vertical guide secured to one of the side walls carries a vertical slide shiftable along the vertical guide. A front horizontal guide on the vertical slide forward of the front wall from the guide carries tool holder shiftable in the front horizontal guide on the vertical slide forward of the front wall and is adapted to hold the tool.

Abstract: In order to save the investment for a separate cold rolling machine for applying threads etc. a cold rolling unit is placed in a moveable manner onto the Z-drives of a turning machine wherein the cold rolling unit can be configured much larger and much more stable and with less wear than a cold rolling unit used in a tool revolver. Even parallel processing through turning and rolling is facilitated.

Abstract: A control panel 21 has a display screen 22. An operator turns a low-thrust pressing key 28 ON in the menu key group 26 displayed on the display screen 22. In this state, the operator turns an operating dial 32 of a manual pulse generator 31, thereby causing an encoder 34 to generate pulses. When the encoder 34 outputs a pulse signal as a command signal, and a servomotor 17 is driven in accordance with the command signal, the tailstock is advanced. With the distal end of a tailstock center contacting a center hole of the workpiece, the operator turns the operating dial 32, thereby finely adjusting the drive torque of the servomotor. Accordingly, the thrust of the tailstock center is finely adjusted, so that the tailstock center is pressed against the workpiece by a low thrust.

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: A tailstock device for a lathe includes a carrier defining an accommodation space for accommodating a hub mount. The hub mount is turnable relative to the carrier and has two angularly displaced stage posts extending radially and outwardly for mounting first and second holders, respectively. By turning of the hub mount, a selected one of the holders is moved to a working position to aligned with a longitudinal axis of a workpiece held thereby. The tailstock device can hold a variety of workpieces, and allow adjustment of the angle and position of a workpiece held thereby.

Abstract: A machine tool apparatus and method for exterior and interior cutting operations on a workpiece is provided. In one form, the machine tool apparatus has a common support assembly with a tailstock and a boring tool holder mounted thereto. The common support assembly has a common support carriage that is mounted to a machine base for travel along a longitudinal axis parallel to a central axis of the workpiece. The tailstock and boring tool holder are mounted to a mounting base portion for travel transverse to the workpiece central axis. In one form, a turret having external cutting tools is separate from the boring tool holder and mounted to the machine base for performing external cutting operations on the workpiece. This separate mounting allows the turret to machine the exterior of the workpiece while also permitting a longer boring tool to perform deep internal cutting operations on the workpiece.

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 relates to the trail spindle of a lathe including an oil hydraulic circuit for thrust compensation, wherein lathe turning operations on a processing object can be performed always accurately by preventing the processing object from being swung and the shape of the processing object from being deformed, in such a manner that necessary thrust is generated by using an oil hydraulic cylinder and a pressure reducing and relieving valve without using the existing method of moving a tail spindle using a screw and the oil hydraulic circuit automatically performs thrust compensation (i.e., maintains constant thrust) according to a change in the length of the processing object during lathe turning operations.

Abstract: A tailstock control device supports an object to be machined by driving and controlling a servo motor which drives a driving system of a tailstock having a spring member in forward and backward directions, to cause a tailstock center connected to the tailstock to contact a center hole of the object to be machined. The tailstock control device comprises a limit torque value calculating unit which calculates, as a limit torque value (Tm), a drive torque value of the servo motor necessary for supporting the object to be machined, and a servo control unit which drives and controls the servo motor to attempt to move the tailstock at a tailstock movement velocity (Vs) which is set in advance, until an output torque value (Tr) of the servo motor reaches the limit torque value (Tm). The limit torque value (Tm) is calculated by subtracting, from the support thrust (Fa) necessary for supporting the object to be machined, an excessive thrust Fs which is calculated based on the tailstock movement velocity (Vs).

Abstract: 1) The carving vise holds an article to be carved at optimal positions for ease of carving. Its design reduces carvers fatigue; damage to the carving article while being held; and the likelihood of carving injuries. It also greatly improves the carvers carving efficiency. 2) Significant design features are the reduction in the amount of repositioning release mechanisms to reposition the craving article. The design is unique in that the carving article can be moved in three ways. Rotated 360 degrees around the head and tail stock axis, 2) rotated 90 degrees relative to the work bench to which it is mounted, 3) slides in and out relative to the mounting point. The head and tail stock will move independently and also can be repositioned while securely holding a carving article by moving the square tube assembly. The locking mechanism for rotational movement and the brake assembly for locking the vise in vertical positions are new simplistic designs that securely lock in all positions.

Abstract: A control panel 21 has a display screen 22. An operator turns a low-thrust pressing key 28 ON in the menu key group 26 displayed on the display screen 22. In this state, the operator turns an operating dial 32 of a manual pulse generator 31, thereby causing an encoder 34 to generate pulses. When the encoder 34 outputs a pulse signal as a command signal, and a servomotor 17 is driven in accordance with the command signal, the tailstock is advanced. With the distal end of a tailstock center contacting a center hole of the workpiece, the operator turns the operating dial 32, thereby finely adjusting the drive torque of the servomotor. Accordingly, the thrust of the tailstock center is finely adjusted, so that the tailstock center is pressed against the workpiece by a low thrust.

Abstract: A tailstock device for a lathe includes a carrier defining an accommodation space for accommodating a hub mount. The hub mount is turnable relative to the carrier and has two angularly displaced stage posts extending radially and outwardly for mounting first and second holders, respectively. By turning of the hub mount, a selected one of the holders is moved to a working position to aligned with a longitudinal axis of a workpiece held thereby. The tailstock device can hold a variety of workpieces, and allow adjustment of the angle and position of a workpiece held thereby.

Abstract: A wood working lathe includes a granite lathe bed including a guiding rail extending thereon longitudinally and an opening vertically formed through an end thereof, with the opening in communication with the guiding rail. A driving unit is installed to the lathe bed. A granite fixed stock is disposed on the end of the lathe bed relative to the opening of the lathe bed and includes a driven unit inserted therethrough axially and a compartment formed therein and in communication with the driven unit. The driving unit drives the driven unit to turn through the compartment. A granite foot stock is slidably installed on another end of the lathe bed and includes a positioned member for selectively fixing the foot stock to the lathe bed and a feeding device. An axis of the feeding device is coaxial with an axis of the driven unit, with cooperation of the driven unit and the feeding device adapted for clamping works to be turned.

Abstract: A tailstock control device supports an object to be machined by driving and controlling a servo motor which drives a driving system of a tailstock having a spring member in forward and backward directions, to cause a tailstock center connected to the tailstock to contact a center hole of the object to be machined. The tailstock control device comprises a limit torque value calculating unit which calculates, as a limit torque value (Tm), a drive torque value of the servo motor necessary for supporting the object to be machined, and a servo control unit which drives and controls the servo motor to attempt to move the tailstock at a tailstock movement velocity (Vs) which is set in advance, until an output torque value (Tr) of the servo motor reaches the limit torque value (Tm). The limit torque value (Tm) is calculated by subtracting, from the support thrust (Fa) necessary for supporting the object to be machined, an excessive thrust Fs which is calculated based on the tailstock movement velocity (Vs).

Abstract: A system and method for sealing a live center is provided. The live center has a spindle disposed, at least in part, within a housing, bearings provide a rolling connection between the spindle and the housing, and a labyrinth seal is mounted to at least one of the spindle and the housing and is configured to reduce an amount of contaminant from entering the housing. A method of sealing a live center is also provided. In some embodiments of the invention, the method includes restricting a fluid path along a spindle, defining the fluid path to have a labyrinth section, providing a drain to the outside of the live center for fluid moving along the path and substantially blocking the path of the resilient seal.

Abstract: A lathe has a bed, a rack and a mechanized tailstock assembly. The bed has a track having a chamber and a slot. The rack is connected securely to the bed. The mechanized tailstock assembly is movably mounted to the bed and has an outer guide, two moving guiding brackets and a drive device. The outer guide is movably mounted on the bed aligning with the slot. The guiding brackets are respectively connected to the outer guide, extend into the chamber of the track and each guiding bracket has a guide wheel. The drive device is connected securely to the outer guide, engages with the rack and has a casing, a drive axle and a drive wheel. The mechanized tailstock can be moved simply and easily and accurately using the drive device and the guide brackets prevent it from falling away from the surface.

Abstract: An apparatus for spinning tubes includes a horizontal, adjustable bed, the bed including a bed housing and a slide movably disposed in the bed housing, a tailstock assembly fixed to a top of the slide, the tailstock assembly including a tailstock coupling, bearings for supporting the tailstock coupling and a locking clamp that moves the tailstock coupling and bearings relative to the slide, a drive coupling, a drive unit connected to the drive coupling, and a rocket motor tube disposed between the drive and tailstock couplings, the rocket motor tube including a mask, each mask including an angled surface thereon.

Abstract: A multitasking workpiece machining apparatus includes a pair of workpiece support devices supporting an elongated workpiece, first and second headstocks at positions outside of the workpiece support devices. The second headstock is capable of moving closer to and apart from the first headstock. Each workpiece support device respectively includes a travel drive device traveling between the first and second headstocks. A numerical control unit controls travel of each workpiece support device by synchronously controlling each travel drive device.

Abstract: A lathe spindle unit is provided with: a rotatable spindle having a cam follower, and a holding section for holding a work piece; a drive source for rotatively driving the spindle; and a driven rotation shaft that has a cam and that is rotatively driven by the drive source. The driven rotation shaft rotatively drives the spindle using the cam and the cam follower.

Abstract: The lathe comprises: a spindle for holding one end side of an annular workpiece W; a rotation drive mechanism for rotating the spindle; and a holding mechanism 20 for holding the other end side of the workpiece W. The holding mechanism 20 comprises: an inserting member 21 which is arranged to rotate freely and of which distal end is inserted into an interior of the other end side of the workpiece W; a support member 28 which supports the inserting member 21 to rotate freely; a plurality of contact members 23 which are arranged on an outer circumferential surface of the distal end of the inserting member 21 and which outwardly protrude to be in contact with an inner circumferential surface of the workpiece W; and a drive mechanism 30 for driving each of the contact members 23 so as to be brought into contact to each other.

Abstract: A tailstock of a woodturning lathe comprises: an axial block settled on the lathe bed which can be axially moved and positioned along the lathe bed, a radial block including a stationary seat fixedly fastened to the axial block and a sliding seat which can be moved and positioned against the stationary seat, a tailstock body fixedly fastened with the sliding seat, a first handwheel for controlling a first lead screw which is piercing through the tailstock body to rotate, wherein as the first lead screw is rotated, a linear movement of an edge case, spacer ring seat, spacer ring, second lead screw, shaft and workpiece fastener which are connectedly assembled can be conducted, and a second handwheel for controlling the shaft and a second lead screw to rotate, wherein as the second lead screw is rotated, the work piece fastener is propelled to perform a spiral movement in accordance with the threads of the second lead screw.

Abstract: Woodturners who make bowls frequently find that the unoccupied tailstock limits the path of the tool handle. The normal solution is to manually remove the tailstock from the lathe and set it on the floor or a work bench. Tailstocks can be heavy and manual removal and reinstallation might be needed several times during the production of a single piece. The invention provides a means to get the tailstock out of the turners way via a short bed extension that is pivotally mounted on the end of the lathe bed. To use it, the tail stock is slid back onto the extension, a hold down is released, and the tailstock is tilted away from the user. After tilting, a second set of ways lines up with the existing bed, allowing full use of the additional length afforded by the invention. The invention allows the tailstock to be easily returned to its normal position.

Abstract: A method is provided for centering a workpiece on a metal shaping machine. First and second guide plates have respective first and second aligned bores therein for supporting a centering pin mounted therein for axial movement between a retracted position and a use position. At least one spring is engaged with the centering pin for exerting a predetermined axial bias against the centering pin in the direction of the workpiece for urging the centering pin into the use position. The centering pin is locked in the use position during the operation of the machine on the workpiece.

Abstract: The present invention generally relates to the field of woodworking tools and particularly to an indexing assembly for a lathe. An aspect of the present invention is directed to a lathe, including a frame; a bed coupled with the frame; a head stock configured for mechanically engaging a first end of a workpiece, the head stock being coupled with the bed; and a tail stock, including a housing, the housing including a fine adjustment assembly for mechanically engaging with a second end of the workpiece, wherein the tail stock is adjustably and slidably coupled with the bed via an indexing assembly, the indexing assembly configured to provide the lathe with positive locking capabilities.

Abstract: An apparatus is provided for centering a workpiece on a machine tool that includes first and second guide plates having respective first and second aligned bores therein for supporting a centering pin mounted therein for axial movement between a retracted position and a use position. The centering pin cooperates with a workpiece such as a fan rotor blade of a turbine engine for positioning the workpiece in a predetermined position relative to a metal shaping operation to be carried out by the machine on the workpiece. At least one spring cooperates with the centering pin for exerting a predetermined axial bias for urging the centering pin into the use position. A lock locks the centering pin in the use position.

Abstract: In an apparatus (10) for clamping and positioning workpieces (36) of different length between two centers (26,28), comprising a base (14) with at least one linear guide (18), a first carriage (20) displaceable in a linearly guided manner on the linear guide (18) and having a clamping center (26), a second carriage (22) displaceable in a linearly guided manner on the linear guide (18) and having a tail center (28), and a drive means coupled to the first or/and the second carriage (20,22), it is provided that the first carriage (20) and the second carriage (22) are displaceable on the linear guide (18) relative to one another and relative to the base (14) in such a way that workpieces (36) of different length can be received between the clamping center (26) and the tail center (28), it furthermore being the case that the first or/and the second carriage (20,22) have a prestressing means (78) and it being the case that the clamping center (26) or/and the tail center are displaceable, on contact (28) with the wor

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: To provide a grinding machine and a centering method for the centers thereof in which the requisite space for the center support rotating mechanism for a workpiece and the in-feed mechanism is reduced to facilitate miniaturization and in which it is easy to secure the space for the supply and discharge of the workpiece and sizing measurement. A motor built-in type main spindle retaining a rotary drive center and a motor built-in type tailstock spindle retaining a tailstock center are swiveled by in-feed means eccentrically supporting them, whereby the rotary drive center and the tailstock center make an in-feed motion with respect to a grinding wheel.

Abstract: A clamping device for machine tools is disclosed that is capable of ensuring the clamping force for a tailstock while maintaining a small overall size of the device and a reduced number of parts. The tailstock (movable carriage) movably mounted on a fixed bed is clamped at a specified position to the fixed bed. A stationary rack (stationary fitting member) extending in a direction of movement is fixed to the fixed bed. A movable rack (movable fitting member) is provided on the tailstock so as to be movable in a direction transverse to the direction of movement of the tailstock. Wedge-shaped fitting surfaces are formed at mutually opposing portions of the stationary rack and the movable rack. The movable rack is driven to perform advance-and-retreat motions between a clamping position where the movable rack fits together with the stationary rack and an unclamping position where the clamping state is released.

Abstract: Method and apparatus for effecting an interference fit of a first part and a second part, wherein a thrust force is applied to the second part in a direction toward the first part to thereby accelerate the second part for applying a kinetic energy to the second part to cause abutting contact of the second part with the first part for achieving the interference fit of the first and second parts, and wherein the initiation of acceleration of the second part by the thrust force is inhibited until the thrust force has been increased to a predetermined threshold, and is permitted when the thrust force has been increased to the predetermined threshold.

Abstract: An improved live center for use with tapered shanks.

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: The present invention therefore provides in one aspect a lathe including: a headstock comprising a lathe spindle; a tailstock; and a lathe bed wherein the lathe bed is mounted to be rotatable in a horizontal plane about a vertical axis. In a second aspect of the invention there is provided a lathe including: a headstock comprising a lathe spindle passing through a hollow column and within the hollow column means adapted to safely connect a vacuum to the interior of the lathe spindle; a tailstock; and a lathe bed wherein the lathe bed is mounted to be rotatable in a horizontal plane about a vertical axis.

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 method and related structure for operating an engine lathe comprising performing the desired lathe operation by automatically translating the tailstock toward a workpiece and automatically stopping said translation at predetermined distances.

Abstract: A force control method for a bar feeder supporting a workpiece in a lathe, including seizing the workpiece by a Z-axis spindle of the lathe and the bar feeder, performing position control by the Z-axis spindle of the lathe, and performing force control by the bar feeder to apply a constant torque to the workpiece during the force control of the bar feeder supporting the workpiece in the lathe. This control of the bar feeder does not require the Z-axis spindle of the lathe and the bar feeder to be synchronized for the position control in the Z-axis direction, and prevents the workpiece from being deflected.

Abstract: A tailstock assembly mountable on a machine tool and cooperable with a headstock assembly for retaining a workpiece inbetween.

Abstract: A machine for carving workpieces having substantially similar configurations generally including a base member, means disposed on the base member for retaining at least one workpiece thereon, means for rotationally indexing the workpiece disposed on the retaining means, about an axis, a working tool operatively engageable with a workpiece disposed between the retaining means, supported on the base member and displaceable along x, y and z axes pursuant to a programmed sequence of motions coordinated with the workpiece indexing means for shaping the workpiece in a selected configuration, and at least one means for successively positioning a plurality of similarly configured workpieces in a selected orientation including a support member, a jointed linkage supported on the base member, supporting the support member and manipulatable to position the support member into a support relationship with an initial one of the workpieces disposed in the selected orientation and held by the retaining means, means for fixin

Abstract: An apparatus for servicing and repairing cues including a collet mounted to a rotation member and having a collet body defining a passage including a generally conical surface, at least two collet jaws formed of a flexible resilient material and slidably disposed within the passage to define arcuate gaps with the surface, and an adjuster for slidably moving the collet jaws to flexibly bear against a cue inserted through the collet. A cutter feed includes a mounting to a bed proximate to a headstock for movement parallel to the bed. A cue tip shaper mounted to the cutter feed and having a rotatable arm for shaping a cue tip to a preselected curvature. A flexible resilient sleeve rotationally mounted to a support for holding a cue by frictional contact. A pivot mount for mounting a motor to the bed in a first position proximate to the support and pivotable to a second position proximate to the headstock. A pincers press mounted for sliding movement along a guide way to pinch and smooth wrap on a cue.

Abstract: A mechanism for clamping a banjo (10) toolrest or toolrest bracket to a lathe bed (51) which makes use of a sliding cam (40) which is actuated by a drive shaft (18). The cam is supported independently of the drive shaft by a support block (12) resting on a ledge (14) wich is formed in the base of the banjo. The cam is slidable with respect to the drive shaft along the length of this ledge on the banjo. This structure allows for sturdy clamping with minimal deflection at a predicable catching position along the length of the banjo rest. An eye bolt (20) is used to connect the cam to a clamping plate (22) which is positioned below two, spaced-apart rails (50) extending along the top of the lathe bed. The banjo rest has a generally open bottom (94) through which the shank of the eye bolt extends. Opposite ends of the drive shaft are rotatably supported by end walls (74, 76) of the banjo rest.

Abstract: In the case where a product having a free-curved surface is obtained, a machining work is performed by separate machine tools. Therefore, works of attaching and removing a half-machined product are necessary. Consequently, a lot of working time and labor are required. Also in an automatic production system, productivity is lowered if the system is stopped by failure in gripping during the attaching and removing works and an enormous equipment cost is required. A machining apparatus M comprises a main chuck head 1 having a control axis for holding and rotating a long bar member W, a head stock assembly 3 having three or more control axes, and a bar member feeder 5 for feeding the long bar member W to the head stock assembly 3. These four axes are simultaneously controlled to manufacture a plurality of products V having free-curved surfaces from the long bar member W.

Abstract: A machine for carving workpieces having substantially similar configurations generally including a base member, means disposed on the base member for retaining at least one workpiece thereon, means for rotationally indexing the workpiece disposed on the retaining means, about an axis, a working tool operatively engageable with a workpiece disposed between the retaining means, supported on the base member and displaceable along x, y and z axes pursuant to a programmed sequence of motions coordinated with the workpiece indexing means for shaping the workpiece in a selected configuration, and at least one means for successively positioning a plurality of similarly configured workpieces in a selected orientation including a support member, a jointed linkage supported on the base member, supporting the support member and manipulatable to position the support member into a support relationship with an initial one of the workpieces disposed in the selected orientation and held by the retaining means, means for fixin

Abstract: An adjustable spur center device for use with lathe machines. The spur center features easily interchangeable center points, one that can be either extended or retracted without removing the spur center from the lathe or dismounting the workpiece, and the other a spring-loaded version that permits an operator to remove or insert a workpiece without having to stop the rotation of the spindle. The spur center also features individually adjustable spurs that can be easily removed for resharpening or replacement.

Abstract: A tailstock for a lathe. The tailstock includes a housing, a rigid sleeve mounted in the housing and being both rotatable and axially displaceable with respect to the housing, a center integral with the sleeve and disposed at a front end of the sleeve for supporting the workpiece, and a spindle which can axially displace the sleeve in the housing. Hydrostatic radial bearings support the sleeve for axial and rotational displacement of the sleeve in the housing, the sleeve and the radial bearings being disposed relative to one another such that no additional structural components are interposed therebetween, the radial bearings thereby directly contacting the outer surface of the sleeve. In addition, a hydraulic system axially supports the sleeve for compensating for changes in an axial force applied by the workpiece to the sleeve thereby keeping the axial force constant.

Abstract: A resiliently yieldable tail stock device for use in a numerically controlled lathe comprises a body slidable along a bed toward and away from a spindle, the slidable body having a bore and a passage hole each formed therethrough in an axial alignment with the spindle. Removably received within the bore of the slidable body is a center socket movable between an extended position and a retracted position and having a tapering blind bore open at its front end. The center socket carries a live center that has a pointed front end engageable with a workpiece and a tapering rear shank fitted into the tapering bore. Fixedly secured to the center socket is an elongate rod carrying a dog at its distal end. A compression spring is used to resiliently bias the center socket toward the extended position. A combination of electric motor and lead screw serves to cause a linear reciprocating movement of the slidable body. The electric motor is deenergized as the dog reaches a rearmost position just above a proximity switch.

Abstract: A machine tool such as a lathe for machining a workpiece having a longitudinal axis and being held at opposite axial ends by face drivers that are affixed to the spindle of a moveable headstock and securely contact the workpiece end faces with a predetermined pressure. A first servo loop is established to control the position of the headstock on the basis of detected position information and a second servo loop is established to control the movement of the head stock so that the pressure against the workpiece end faces is kept at predetermined values. The second servo loop may utilize the detected position of the headstock or it may utilize the monitored command value for purposes of judging whether modifications to the command value are necessary to provide the desired pressure values. A torque limiter also may be used to provide the desired control.

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: When a cylindrical single crystal ingot terminating in generally conical parts at the opposite ends thereof is machined with a cylindrical grinder which is adapted to support the ingot in place by fastening the conical parts of the ingot to a spindle side chuck and a tailstock side chuck severally provided with a conical hole and grind and finish the cylindrical part of the ingot while keeping the ingot driven on the spindle side, the ingot is liable to produce idle rotation possibly to the extent of disrupting the grinding work.

Abstract: A universal cylinder mount for mounting a at least one of a plurality of cylinders between a headstock and a tailstock of an engraver. Each of the cylinders have a mounting aperture at each end adapted to receive a universal cylinder mount associated with each of the headstock and tailstock. The universal cylinder mount is adapted to accommodate a plurality of mounting apertures formed with different sizes and having various sloped walls for facilitating alignment and frictional gripping engagement of the cylinders.