Abstract: A power tool for surface treatment comprises a housing, a motor accommodated in the housing, a tool holder, a tool supported in the tool holder and driveable by the motor, the tool having a substantially triangular base surface for receiving a substantially triangular grinding sheet, the tool holder being shell-shaped and having a substantially triangular contour substantially corresponding to the base surface of the tool, and also having an outer edge abutting on the tool.

Abstract: A focusing nozzle for producing and jetting a precisely focused, sustained cohesive jet of a mixture of a fluid and abrasive material, having a long coherence length and a prolonged centerline pressure for obtaining clean, precise, sharp-edged kerfs, cuts and grooves in hard substances.

Abstract: Current pole mounted vacuum sanders have universal connections between the pole and sander which permit the sanding pad to lift off the sanding surface when pressure is applied. The present invention provides a universal connection between the pole and base of the vacuum hand sanding device which allows the head to be semi-locked into position when the pole is angled to the working surface to prevent the pad lifting from the surface.

Abstract: A magnetic resistive head lapping system is disclosed herein which incorporates an automatic applied force lapping fixture for row tool balance and bow correction. The fixture is mounted over a rotatable lapping plate and is effective to present a row tool or slider bar with magnetic heads deposited thereon to the abrasive surface of the lapping plate in proper orientation during batch fabrication of the magnetic heads. The fixture includes a stationary assembly and a movable assembly on which the row tool and slider bar are carried. A pair of electromagnetic actuators on the stationary assembly correct for balance while three electromagnetic coils on the movable assembly correct for row tool bow.

Abstract: A bevel grinder for an edge of a sheet workpiece of predetermined thickness has a generally planar support on which the workpiece lies, a head having a frustoconical grinding surface centered on an axis substantially perpendicular to the support and rotatable about the axis, and a drive connected to the head for rotating same about the axis with the surface engaging the sheet at the edge and for relatively displacing the head and workpiece. Thus the head moves along the edge so that a bevel is ground in the edge. A spacer on the head projects axially therefrom toward the support and has an axial dimension smaller than the workpiece thickness.

Abstract: A method for flattening an inter-layer insulating film of a semiconductor device of a multi-wiring is carried out with a chemical-mechanical polishing process by using an apparatus, which includes two-layer polishing cloth having an unwoven cloth and a hard foamed layer affixed on a support plate. In order to fluff on a surface of the hard foamed layer or recreate on the whole surface thereof, a tool is provided on the polishing cloth. A silicon wafer is held through a backing pad so that an insulating film of a semiconductor device formed on the wafer is polished by the polishing cloth by rotation of the support plate and the wafer, and at the same time the surface layer of the polishing cloth is fluffed by the tool provided with a polishing surface having the curvature as that of the backing pad. Therefore, a polishing rate can be kept stable, and uniformity of polishing quantity is improved.

Abstract: A compact cutter for drilling or cutting material, such as rock, is formed from a substrate of tungsten carbide, or other hard substance, bonded to a polycrystalline layer which includes an upper, generally planar cutting surface. The corner formed by the cutting surface and the sides of the polycrystalline layer is rounded by honing to remove cracks and other irregularities and to eliminate the need for chamfering the corner.

Abstract: A random orbit sander having a speed limiter includes a bearing upon which a platen is rotatably mounted. The speed limiter includes a braking member formed of a non-magnetic, electrically conductive material fixed relative to the platen of the sander. The spin limiter also includes at least one magnet supported by a housing of the sander and being disposed adjacent the braking member. A magnetic field formed by the at least one magnet intersects the braking member wherein relative movement between the at least one magnet and the braking member results in the generation of an eddy current force which inhibits rotation of the platen.

Abstract: A semi-conductor wafer polishing machine having a polishing pad assembly and a wafer holder includes a support positioned adjacent the polishing pad assembly. This support has at least one fluid inlet connectable to a source of fluid at a higher pressure, at least one fluid outlet connectable to a fluid drain at a lower pressure, and at least one bearing surface over which fluid flows from the source to the drain. The polishing pad is supported by the fluid over the bearing surface for low-friction movement with respect to the support. Similar fluid bearings can be used in the wafer holder. An array of generally parallel grooves is provided on a belt support surface to reduce hydroplaning of a polishing belt. A turbine drive system rotates a wafer chuck in a wafer holder.

Abstract: A finishing tool useful in sanding, abrading and like activities. The tool comprises a block having slots of a predetermined size and shape disposed in opposite ends of the block. The slots are adapted to receive matching holding elements so that a predetermined length of finishing material, such as sandpaper, may be placed across the support surface of the block, the ends of sandpaper being inserted and securely held between the surfaces of the holding elements and the slots. The holding elements are pulled inwardly by retraction elements such as one or more lengths of an elastic material such as a rubber hose interconnecting the holding elements. Passages are provided in the block for housing such elastic members.

Abstract: An improved star head sanding assembly for sanding on the peripheral edges of the individual abrasive discs. The discs are provided with radially arranged non-parallel skip cuts, and are devoid of radial cutout sections to provide maximum peripheral surface area. During use, the free edges of the individual fingers tend to twist through substantially a right angle to present a line contact with the workpiece surface at least partially perpendicular to the direction of movement of the assembly relative to the workpiece.

Abstract: A portable abrading tool including a tool body and a head which is movable relative to the tool body by a motor and is adapted to carry a sheet of sandpaper or other element for abrading or polishing a work surface, with the head containing a first passage or passages for conducting a flow of incoming water through the interior of the head to the work surface, and an additional passage or passages for conducting a suction induced flow of intermixed air, water and abraded particles from the work surface through the interior of the head in isolation from the incoming water and without flow of the intermixed air, water and particles through the first passage or passages.

Abstract: A method for repairing and refinishing an audio and video compact disk having a scratch or a plurality of scratches on a plastic cover bottom side of the disk. The scratch interfering with a laser beam reading digital information upwardly through the bottom side of the disk. The top side of the disk having a thin film layer of the recorded digital information secured thereon. The interference by the scratch causing an unwelcome "skip" during the play of the disk thereby lending its playing qualities unacceptable. The method of repair includes first inspecting the disk to determine the depth of the scratch. If the scratch is deep, a heavy cut, medium cut and fine cut cleaner may be used. The top side of the disk is then placed against the soft covered wheel and secured thereto. As the disk is spun at low rpm, the heavy cut cleaner is applied evenly across the surface of the bottom side of the disk using a clean cotton cloth or cotton pad.

Abstract: A rotating polishing wheel having secured to its top surface a polishing pad and a vertically movable carrier element for carrying a workpiece to be polished into contact with the polishing pad and exerting a desired pressure on the workpiece. Operatively attached to the carrier is a conditioning element movable with the carrier and having on its bottom surface cutting means disposed in a circular configuration for conditioning the polishing pad by contact therewith.

Abstract: An ophthalmic lens block and lens generating machine compression sleeve chuck are provided such that the block is of diameter suitable for the lens edging step of the lens generating process. The lens generating chuck consists of a plurality of concentric sleeves mounted on a hub of the spindle shaft and having lengthwise slots permitting compression of the sleeve onto the hub and the block. The sleeves are biased to telescope toward the lens so as to abut the front surface of the lens in a concentric pattern extending outwardly from the outer diameter of the block to support the front surface of the lens against the forces applied to the rear face of the lens during the cutting process. Thus, the combination of the block and the chuck is also suitable for the lens generating, fining and polishing steps of the lens generating process. Consequently, after polishing, the block is left on the lens.

Abstract: An outside diameter finishing tool (10) has an outer shell (16) and an inner annular abrasive layer (22) for precision finishing the outer surfaces of generally cylindrical workpieces. The inner layer (22) of the tool (10) is made of superabrasives and defines the cutting size of the tool (10). The inner layer (22) cuts simultaneously around the full periphery of a cylindrical workpiece rotated within the tool (10). A slot (14) is provided through the tool (10) to allow for radial adjustment of the cutting size of the tool (10).

Abstract: A machine tool comprises a spindle device carrying a tool element attached to the forward end of a rotor spindle drivingly rotatable as supported by a control-type magnetic bearing device, a working force calculating unit for calculating a working force acting on the tool element upon the tool element coming into contact with a workpiece based on exciting current of a magnetic bearing of the bearing device, and a discriminating unit for discerning whether the contact of the tool element with the workpiece is normal or abnormal based on variations in the working force.

Abstract: A semi-conductor wafer polishing machine having a polishing pad assembly and a wafer holder includes a support positioned adjacent the polishing pad assembly. The support includes multiple fluid bearings that support the polishing pad assembly on the support. These fluid bearings are arranged concentrically to provide concentric regions of support for the polishing pad assembly, and each fluid bearing is coupled to a respective source of pressurized fluid at a respective pressure.

Abstract: A pneumatic mechanism for the application of uniform pressure to a mechanically adjustable spindle. The mechanism includes a support shelf with a double-acting piston attached at its non-pressure end to the support shaft. A cylinder receives the piston for telescopingly sliding movement of the piston relative to the cylinder. A lifting stop rod is connected to the pressure end of the piston and an externally threaded tube engages the pressure end of the piston and telescopingly receives the lifting stop rod. A worm wheel engages the threaded tube and a worm gear engages the worm wheel. A hand wheel is connected to the worm gear for rotating the worm gear and the worm wheel. An adjustable connection is provided between the lifting stop rod and the threaded tube permitting limited stop movement of the lifting stop rod by the piston relative to the threaded tube.

Abstract: An in-line sander comprising a sander body which houses a motor coupled to an in-line oscillating mechanism. The in-line oscillating mechanism is adapted and configured to move a sanding pad in a linear oscillating motion.A preferred pad is a profiled sanding pad coupled to the in-line oscillating mechanism. The profiled sanding pad has, in a plane substantially perpendicular to the linear oscillating motion of the sander, a particular cross sectional profile corresponding to a profile to be formed onto or to be sanded on a workpiece. The cross sectional configuration extends substantially consistently along the length of the pad, and the pad defines a sanding surface having a profile corresponding to the particular cross sectional profile. With such profiled sanding pads, sandpaper secured to the sanding surface of the pads will power sand the profile to be formed onto or to be sanded on a workpiece.