Abstract: An adjustable rotational coupler includes a housing having an interior bore concentric with a central axis of the housing. The housing is mountable to a mounting member. Threaded adjusters can be used to adjust the housing with respect to the mounting member such that an attitude of a plane perpendicular to the central axis of the housing is adjustable with respect to an attitude of a plane perpendicular to a central axis of the mounting member. A rotatable inner race is adjustably disposed in the interior bore of the housing such that a face plate is mountable to the inner race. Threaded adjusters can be used to adjust the inner race with respect to the housing such that a central axis of the face plate is transversely adjustable with respect to the central axis of the housing.

Abstract: A machine tool has a pair of rotary spindles which support opposite ends of workpiece to be machined. At least one of the spindles is driven and a ring having a plurality of arms is coaxially secured to this spindle for rotation therewith. The arms entrain an annular member which is essentially coaxial with the spindles and is provided with threads. An annular guide plate which is again essentially coaxial with the spindles supports a plurality of clamping jaws for movement radially of the spindles. The clamping jaws are provided with threads which mesh with the threads of the annular member so that rotation of the latter can cause movement of the clamping jaws. A plurality of rocker arms is mounted on the machine tool for pivotal movement between an inoperative position and an operative position in which the rocker arms engage the periphery of the guide plate to prevent rotation thereof.

Abstract: A device for centering a feedback tachometer on an output motor shaft. The device includes a housing disposed on the motor shaft. The housing includes a base and flange in which is received a mandrel shaft. The central axis of the mandrel shaft may be aligned with the central axis of the motor shaft by set screws provided in the flange and are individually adjustable against the mandrel shaft to alter the position thereof within the flange. An adapter plate may be provided for attaching the base to the motor shaft.

Abstract: To center optic lenses in a mechanical mounting, in particular during edge cutting and bevelling, the invention includes a device with a housing (10), in which a motor drive (M, R) acts through a torque part (50), drive shafts (14, 14') and drive elements (16, 16') onto aligned centering spindles (18, 18'). These are arranged in guide bearings (22, 22') on projecting parts of the C-shaped housing (10) and are constructed as air bearings. In this manner, it is possible to hold the clamping angle (.alpha.) on the lens (L) in the range below 2.times.8.degree., preferably below 2.times.6.degree.. In particular the lower centering spindle (18) is smoothly axially adjustable in the air bearing (22), for which purpose axially parallel and/or partial-ring-shaped grooves (90) are provided at the ends of a thin-wall guide sleeve (76), between which ends peripheral air-cushion fields build up when pressurized air is being supplied.

Abstract: For centering optic lenses in a mechanical mounting, in particular during edge cutting and bevelling, a device with a housing (10) is provided, in which housing a split drive shaft (14, 14') with a torque divider (50) is supported. Two centering spindles (18, 18') are aligned in an axial direction (A) and are in this manner driven by a motor. The ends of the mutually adjacent ends of the centering spindles carry clamping cups (20, 20') between which a lens (L) can be aligned and clamped. An air bearing is provided at least for the lower clamping spindle. The air bearing can be pressure loaded by paraxial and/or graduated-ring-shaped channels (90) with control openings (A, B). In particular, two diametrically opposed air-cushion fields can be loaded with pressure. The clamping spindle (18) can then be smoothly axially moved by a membrane piston (32) permitting thereby a very finely dosable feed movement (FIG. 3).

Abstract: An automatic workpart centering mechanism for a magnetic or other chuck of a machine tool is provided. A computer microprocessor controls a digital air pressure regulator and/or an air solenoid valve to supply air pressure to a pneumatic centering hammer to control striking force on a workpart as it is rotated by the chuck and held thereon by a given chuck holding force with the location of the striking force on the workpart also under control of the microprocessor.

Abstract: A method and apparatus for rotatably supporting a workpiece WP includes a bearing ring 300 which extends around a center support member 204. The bearing ring is deflectable inwardly at a plurality of spaced apart locations 310 to engage the center support member at these locations during machining of a workpiece. At each of the locations where the bearing ring is deflected inwardly into engagement with the center support member, the bearing ring has a reduced thickness to thereby reduce the resistance of the bearing ring to deformation at these locations. Fluid pressure applied against the outside of the bearing ring deflects the bearing ring inwardly at the locations of reduced thickness. The deflected portions of the bearing ring engage the center support member to securely hold it during machining of a workpiece.