Abstract: The machine tool of the invention combines the following three features: the workpiece holder (22) rotates around an axis (C) which is referred to as horizontal turning axis and is parallel to one (X) of the three orthogonal axes (X, Y, Z), the said axis (C) overlying a table (12) the flat upper-face of which is parallel to said turning axis (C) and comprises means for fastening one or more support and/or centering means (15, 24); the toolholder (38) comprises two clamping mandrels, one for a stationary tool and the other for a rotary tool; the workpiece holder is in relation with drive means (23, 25) which confer upon it one of the three kinematics of the following kinematic group: immobilization in a given angular position, a so-called slow speed of rotation for milling operations which are not parallel to the axis (C), and a so-called high speed for the turning.

Abstract: Disclosure is made of a bar-clamping device having a hollow spindle carrying first and second collets, each provided with a closing drive ensuring independent axial motion of one of the collets relative to the other. The closing drives of each collet are installed in the spindle and designed so that the axial efforts produced during clamping of a bar are directed in the opposite directions.

Abstract: A mechanism for detachably mounting any selected one of several attachments to a hollow spindlehead ram within which a spindle is rotatably supported by a hollow shaft, the latter being capable of both rotary and axial displacement relative to the ram. Both the hollow shaft and the selected attachment are coupled with the ram via Curvic coupling teeth. Further, in order to retain the attachment in positive engagement with the ram via the Curvic coupling teeth, a series of external locking teeth are formed on the hollow shaft at constant circumferential spacings for engagement with a series of internal locking teeth formed on the attachment. The hollow shaft forces the attachment against the ram via the interengaged locking teeth under hydraulic pressure.

Abstract: The invention pertains to a process and an apparatus for machining axially symmetrical parts on lathes or rotary broaching machines in which the workpiece is held at each end by an axial clamping pin and a clamping jaw assembly, the clamping pins and clamping jaw assemblies cooperating such that the clamping jaw assemblies may be retracted relative the clamping pins when the ends of the workpiece are being machined and may be extended relative the clamping pins when additional support for the workpiece is desired, as, for example, when the central portion of the workpiece is being machined. The clamping pins and clamping jaw assemblies are movable relative each other and relative the workpiece such that machining of both ends of the workpiece may take place simultaneously or sequentially, followed by machining of the central portion of the workpiece, on a single apparatus and as part of a continuous, uninterrupted machining sequence.

Abstract: A speed reducing device is provided for use with a multi-purpose woodworking tool such that faceplate turning operations may be performed on large diameter workpieces. The device includes a housing which partially supports input and output shafts passing through opposite sides of the housing. An end of the input shaft located within the housing is formed with a hole for receiving an end of the output shaft within the housing such that the input and output shafts coact with one another to support each other and prevent one another from pivoting about the points at which they are supported by the housing. The input and output shafts rotate relative to one another and are both connected to a sheave by a pair of belts such that the input shaft may be driven by the output spindle of a woodworking tool at a first speed and the output shaft will be driven by the belts and sheave at a slower speed which is acceptable for turning large diameter workpieces.

Abstract: A machine tool has a housing normally rotated about a housing axis and a part that is axially movable relative to the housing to adjust the tool. An adjustment apparatus for the tool has a drive having a rotary drive output, a differential transmission having a rotary input connected to the drive output and a pair of transmission outputs. This transmission includes a reverser for rotation of one of the transmission outputs opposite that of the other transmission output. Respective wheels coupled to the transmission outputs are rotatable coaxially on the tool housing and respective screws are rotationally coupled to the wheels, axially fixed on the tool housing, and both threaded in the movable part of the machine tool. According to this invention one of the screws is of opposite hand to the other screw.

Abstract: A device which substantially compensates for the expansion or contraction of a machining apparatus to varying temperatures in and among the components of the machining apparatus links two axes of movement of the machining apparatus by providing a measurement axis defined by the intersection of a first vertical plane passing through the cutting tip of a cutting tool and a second vertical plane passing through the workface of a workpiece to be machined, and associating one end of a temperature-insensitive member with this measurement axis, the other end of the temperature-insensitive member being in the same vertical plane as a reference point which remains stationary with respect to the measurement axis regardless of the thermal growth of the components of the machining apparatus.

Abstract: For centering of optic lenses in a mechanical mounting, in particular during edge cutting and bevelling, the invention includes a device with a housing (10), which is resistant to twisting and which supports centering spindles (18, 18') with clamping cups (20, 20') thereon, between which clamping cups a lens (L) can be aligned and clamped for a cutting operation. A motor drive (M, R) acts on a torque divider (50) having a guide member (52) between axially and radially supported plates (58, 58'). Their frictional connection through a ring of balls (54) with controllable contact pressure, which is introduced through a pressure piece (62), assures an absolute synchronous running of the split drive shaft (14, 14') which acts on the centering spindles (18, 18') through belt drives (46, 46').

Abstract: An apparatus for actuating clamping jaws of a chuck via an adjustment member that, to produce a rotational adjustment movement, is drivingly connected with an actuator formed from a reversible drive motor and a subsequent gear mechanism that is drivingly connected to the output side of the motor via a torque coupling. The gear mechanism is embodied as a two-stage synchronized gear in the form of a transmission gear drive having central gears that are rotatably mounted within one another and are drivingly connected via a step-type gearing to a drive member of the chuck and to the adjustment member. The central gears are drivingly and synchronously coupled via two transmission gears fixedly disposed on a transmission shaft that is rotatable about the central gears and engages the torque coupling in a load-dependent manner. The reduction stages of the transmission gear drive correspond to transmission stages of the step-type gearing.

Abstract: A lathe and a method of using the lathe are disclosed for forming an aspheric surface on a workpiece, in which the workpiece is mounted to a holder that is rotatably carried by the spindle, headstock and bed of a lathe, with that spindle and workpiece being rotated about the axis of the spindle with the workpiece being engaged by a forming tool which forming tool is moved through an arcuate path about an axis that is generally transverse to the spindle axis. The method and apparatus provide further for determining the time-varying angular position of the forming tool along the arcuate path, for determining the time-varying angular position of a point on the workpiece about the spindle axis and for reciprocating the workpiece holder and the workpiece held thereby relative to the lathe headstock and to the forming tool in synchronization with the movement of the forming tool and with the rotation of the workpiece about the spindle axis to form the desired contoured surface.

Abstract: A center-drive lathe has a longitudinally elongated machine base having a front, a back, and a pair of longitudinally spaced ends. A centerstock is generally centrally mounted on the front of the base and a pair of guides on the front of the base extend longitudinally at least from the centerstock to the ends of the base. Respective carriages are displaceable longitudinally along the guides between the ends and the centerstock so that a workpiece can be spanned in and rotated by the centerstock and worked by tools held on the carriages. A stack of interconnected telescoping plates including one end plate connected to one of the carriages and another end plate connected to the other carriage extends over the guides and past the centerstock between the carriages. The guides are thus covered between the carriages by the telescoping stack of plates.

Abstract: A break away machine tool assembly includes a support to which a bearing plate is pivotally mounted in overlying and contiguous relation. A tool element overlies and is contiguous the plate and is movable therewith. Securement elements releasably secure the plate and the tool element in overlying relation to the support for permitting the plate and the tool element to move relative to the support within a defined range upon being subjected to an impact.

Abstract: A supporting head for an apparatus for machining plates of glass, marble and the like, including a main head supporting an auxiliary head; the main head is adapted to support large plates, the auxiliary head is adapted to support small plates. The main head has a main shaft connected to an auxiliary shaft of the auxiliary head by means of gears. The gears and main head may be selectively locked and released to allow for a rotation of the main head or a rotation of just the auxiliary head.

Abstract: Axially displaceable shifters on the stock of a machine tool around the spindle serve to actuate clamps against the force of respective spring stacks to release a workpiece carrier whose pins are engaged by the clamps, thereby keeping the main spindle passage free from obstruction in a system for the quick-change replacement of workpieces on the respective workpiece carrier.

Abstract: A lathe and a method of using the lathe are disclosed for forming an aspheric surface on a workpiece, in which the workpiece is mounted to a holder that is rotatably carried by the spindle, headstock and bed of a lathe, with that spindle and workpiece being rotated about the axis of the spindle with the workpiece being engaged by a forming tool which forming tool is moved through an arcuate path about an axis that is generally transverse to the spindle axis. The method and apparatus provide further for determining the time-varying angular position of the forming tool along the arcuate path, for determining the time-varying angular position of a point on the workpiece about the spindle axis and for reciprocating the workpiece holder and the workpiece held thereby relative to the lathe headstock and to the forming tool in synchronization with the movement of the forming tool and with the rotation of the workpiece about the spindle axis to form the desired contoured surface.

Abstract: The workstock may comprise a tailstock having a slide which releasably carries a workpart center and which includes a center ejector member independently movable in the slide. The slide is mounted in a housing for axial motion toward and away from a headstock center to load and unload a workpart therebetween. The axial position of the slide as well as the center ejector member is monitored by position sensors to provide status of the tailstock center and workpart. The workpart center is loosened by the ejector member in the slide when the ejector member is positioned from a retracted position relative to the pocket to a center eject position toward the pocket so that a robot may remove the center and substitute another center to hold a different workpart.

Abstract: A turning machine which is used preferably for machining spatially complicated shapes. In order to achieve further machining possibilities, apart from the known adjusting possibilities and machining possibilities by means of a universal rest, the spindle head, alternatively or in addition hereto, is mounted on a machine bed in a longitudinally displaceable manner, if necessary in a transversely displaceable manner, an in a swivelable or rotatable manner.

Abstract: A chuck mounting arrangement includes a chuck mounting unit fixed to the head of a spindle of a lathe and having a plurality of jaws and a scroll plate for radialy moving the jaws inwardly and outwardly. A power chuck selected from various types is inserted into the chuck mounting unit so that its adaptor will be clamped by the jaws. The scroll plate is then turned manually to move the jaws inwardly into engagement with the recessed portion formed at the rear of the adaptor. Thus the power chuck is fastened to the spindle. A drawbar mounted in the hollow spindle is provided at its front end with a joint member having its front end splitted into a plurality of joint pieces which are adapted to spread open when moving forward with their own resilience and to be pushed inwardly by a clamping sleeve provided therearound when being retracted. When the power chuck is fixed to the spindle by the chuck mounting unit, the joint pieces grip a chuck control shaft projecting from the rear end of the power chuck.

Abstract: This invention pertains to a head stock assembly for a chucker and bar machine which includes a special bearing system comprising three forward bearings and two rearward bearings for providing five point contacts to the spindle for maintaining stiffness and rigidity and improved accuracy in machining. It also includes cooling fin means for dissipating the heat about the bearings which would normally build up in a headstock after long periods of operation. The heat dissipation reduces growth of the headstock and therefore improves accuracy. In addition, the headstock assembly has mounted directly thereon a spindle encoder, a brake disc, a collet closer mechanism, a balancing disc, as well as a low pressure means for preventing cutting fluids and dust and dirt from entering into the bearing mechanism.

Abstract: In the clamping device a clamping head rigidly attached to the rotating spindle is provided between the rotating spindle and the tool holder which has a plurality of adjustable clamping pieces for holding the tool holder on the clamping head. A clamping rod penetrating the clamping head is provided for the tool holder in the hollow rotating spindle. This clamping rod is slidable axially under power operation, is coupled with a central clamping member of the tool holder and is rotatable relative to the rotating spindle. This clamping rod is couplable and uncouplable with the clamping member by rotation. A clamping pipe which is guided axially slidably and nonrotatably relative to the rotating spindle moves and adjusts the clamping pieces. The clamping rod is engaged in the rotation direction with the clamping pipe by the gear unit which converts the axial motion of the clamping pipe to a rotation of the clamping rod.

Abstract: A multi-spindle lathe includes a pair of main spindles, a first spindle being located on one side of a main spindle head and a second spindle being located on an opposite side of the main spindle head. A supporting shaft extends through the main spindle head, and the head is selectively engageable with a head stock. The head stock is provided with an assembly for rotatably driving either of the main spindles when such spindle is positioned below the main spindle head, in order that a workpiece can be operated upon, while the spindle is positioned above the main spindle head in order for a workpiece to be attached or detached.