Abstract: A polishing pad for semiconductor wafers, having a face shaped to provide a constant, or nearly constant, surface contact rate to a workpiece such as a semiconductor wafer, in order to effect improved planarity of the workpiece. The favored face shape is a sunburst pattern having nontapered rays, coaxial with the pad's rotation.

Abstract: A cam shaft tool for a slide type lathe. The invention generally comprises an improved adjustable tool wherein a plurality of holders each carrying a cutting insert is fixed to a main block via an adjustment block. The holder is radially adjustable relative to said adjustment block and axially relative to said main block. The invention also relates to a cutting insert holder for use in a cam shaft tool.

Abstract: A dual template assembly for permitting rough and finish cuts to be made on successive passes of a tracer lathe includes separate rough and finish templates. A pneumatic cylinder selectively causes sliding movement of the rough template relative to the finish template. The rough template is initially moved to an extended position, wherein an edge thereof is exposed over an edge of the finish template. A lathe tracing stylus is moved across the rough template edge, causing the lathe to remove material from a workpiece in accordance with the rough shaped defined thereby. A sensor generates a signal when the tracing stylus completes its movement across the rough template. In response thereto, the control circuit causes the rough template to be moved to a retracted position, wherein the finish template edge is exposed over the rough template edge.

Abstract: Apparatus and method of truncating a tube by having a knife act against a counter-knife which is positioned within the interior of the tube. The counter-knife is maintained in a desired position with respect to the knife by a magnetic apparatus.

Abstract: A grinding wheel is mounted coaxially of an internal diameter saw blade and rotates with the saw blade during operation. The grinding wheel includes a grinding disc and a center rod which is movably mounted within a central bore of the spindle of the slicing machine. Compressed fluid such as air is used to move the grinding wheel from a retracted position to an extended position against the bias of a spring secured to the center rod. The pressurized fluid is introduced into a chamber for moving an annular sleeve-like piston removably secured to the grinding disc. An adjustable stop ring is also mounted on an adaptor within the sleeve-like piston and has ears which can be deflected by screws from access openings in the grinding disc for fine running adjustments of the grinding disc. This stop ring can be accessed upon removal of the grinding disc from the center rod and sleeve-like piston in order to permit coarse initial adjustments in the positioning of the grinding disc.

Abstract: A rotatable tool head for a machine tool includes a tool slide and a mass balancing counter slide which are radially displaceable in opposite directions. The counter slide is mounted in a central recess of the tool slide such that the mass centers of the tool slide and the counter slide move along substantially the same radial line during tool adjustments. In this manner unbalanced masses present in an arrangement where the slides are positioned in axial or radial adjacent relationship, are substantial eliminated.

Abstract: The invention relates to a device for truncating tubes, comprising at least one knife, which cooperates at the end of the cut with a counter-knife positioned within the tube to be truncated and which is connected mechanically to a core of strong magnetic permeability. In one embodiment, a winding is wound in a framework around the tube to be truncated, to create a magnetic field in the core through the tube to be truncated so as to be able to act magnetically on the longitudinal position of the core and thus on that of the counter-knife. At least one pair of tubular sleeves are fitted at each of the ends of the framework and are formed of a material of strong magnetic permeability, to direct and form the lines of induction. In another embodiment, the winding is arranged around a core which is fixed with respect to said winding and whose axis is positioned parallel and at a distance from the longitudinal axis of the tube to be truncated.

Abstract: A self propelled carriage (28) has a housing (30) comprised of a center body section (51) and a pair of side sections (52) hinged (54) to the body section (51). Side sections (52) may be swung to an open "clamshell" like position for lowering of the carriage (28) onto the pipe (10) for travel along the pipe (10). Nozzles (72) for the discharge of abrasive particles, such as sand, are mounted for oscillating movement in a predetermined stroke to cover a predetermined outer surface area of the pipe (10) for cleaning the pipe and for providing a rough finish for the application of a coating.

Abstract: A method for producing a bifocal contact lens comprising, in combination, the steps of generating a first, concave surface on a first side of a lens blank eccentrically mounted in concave surface cutting means, wherein the center of curvature of the concave surface lies on an axis offset from the optical center axis of the lens blank by a prism offset distance; generating a second, convex surface on the second side of the lens blank, wherein the center of curvature of the convex surface lies on the optical center axis of the lens blank; generating a third, convex surface on the second side of the lens blank eccentrically mounted in convex surface cutting means, wherein the center of curvature of the third, convex surface is coaxial with the second, convex surface; trimming the first, concave surface to form a fourth, concave surface on the first side of the lens blank the curvature of the fourth surface corresponding to the base curve; and finishing the lens by known methods.

Abstract: This invention provides a grinding method and a grinding machine therefor with controlled grinding force which detects the grinding force and grinding rate during operations, calculates in real time the threshold force and grinding wheel sharpness coefficient for each grinding cycle by an arithmetic operation unit, monitors the changes in sharpness of the grinding wheel, and properly changes values instructed by the grinding force commands based on the threshold force, the sharpness coefficient and the predetermined grinding rate value for controlling the feed of the grinding wheel. When the deflection of the grinding wheel shaft changes due to the changes in grinding force, the swivel angle of the grinding wheel shaft or a workpiece is adjusted to prevent the surface of the workpiece from tapering.

Abstract: A method of cutting facets on a gemstone to form a pentagonal shaped gem product such that the cut facets produce a five-legged star to appear beneath the gem table. The gem product produced by this method comprises a pavilion having thirty facets and fifty edges, a crown having twenty-one facets and thirty-five facets, and a five sided girdle.

Abstract: An arrangement for grinding the hardmetal pins of drill bits, e.g. the tungsten carbide buttons (31) of button bits (1), comprises means (parallel arms pairs 9 and 10) for adjusting the position of a grinding pin (15) in relation to the drill bit (1) and also journalling means (4) operative to cause the grinding machine (3) to move relatively slowly in a circuit path around the button on the drill bit (1) to be ground and to cause the grinding pin (15) to rotate rapidly around its longitudinal axis. The drill bit is clamped securely in a stationary holder arrangement (2) which includes a tiltable table (35) which can be adjusted to and locked in selected angular positions.

Abstract: A method of manufacturing a master for projection screens, according to which a pattern of parallel rectilinear grooves and ribs is formed on one side of a plate of machinable material by a slotting operation performed by means of a profile chisel. The grooves (33) are formed in several different tooling steps, with several grooves being tooled simultaneously. The profile chisel is of multiple construction and is composed of three subchisels, i.e. a precutting chisel, a cutting chisel (13) and a finishing chisel.

Abstract: A process and apparatus for grinding the proper taper and all of the flutes with the correct number of spirals simultaneously in a single cycle of the grinding machine. This is accomplished by passing a rotating stock to produce the correct number of spirals under a grinding wheel that is dressed with three or four properly formed ribs depending on how many flutes are being manufactured. These ribs are spaced so as to exactly match the lead distance of the rotating stock during 120.degree. or 90.degree. of revolution, depending on whether a three or four fluted instrument is being manufactured. The height of each individual rib on the grinding wheel varies in relationship with each other to exactly match the correct taper being created by moving either the rotating stock portion of the machine or the grinding wheel portion of the machine so as to increase the distance therebetween.

Abstract: Described herein is a surface treating tape cartridge packaging a surface treating tape in a casing ready for loading the tape on a surface treating machine, and a surface treating machine capable of automatically loading a surface treating tape in position from such a cartridge, the tape cartridge being basically composed of: a casing formed by separably joined upper and lower halves; and a pair of reels carrying a roll of surface treating tape and rotatably accommodated between the upper and lower halves of the casing.

Abstract: A machine tool turret having a plurality of tool holders with tension rod-actuated mechanisms for locking the tool head can be rotated to bring a selected tool holder into engagement with jaws of a release unit, applying to the tension rod a force sufficient to compress the disk spring stack thereof and release the tool and to the holder a counterforce which is equal and opposite in direction and prevents the release unit from stressing the bearings of the turret or any spindle bearings which may make the tool holder rotatable.

Abstract: A surface processing machine employing a processing tape cartridge for polishing or grinding disks or the like. The machine employs a processing tape cartridge which rotatably accommodates in a casing a pair of reels for the winding of processing tape. The machine comprises a cartridge holder for holding the tape cartridge; a tape drawing mechanism to draw out a portion of the processing tape in the cartridge; a guide roller mechanism for setting and transporting the processing tape on a predetermined path of travel; a work holder mechanism adapted to hold and rotate a work at its machining position; and a tape pressing mechanism for pressing the processing tape against the work.

Abstract: Method and apparatus to surface treat a web of fabric by passing it over and in contact with a rotating tungsten carbide coated roll. The selvedges of the web material are held on rotating members with pins on the periphery thereof which penetrate the fabric.

Abstract: A thread cutting insert comprises a block having along one edge thereof a plurality of teeth for successively cutting a thread in a workpiece. The teeth are of successively increasing heights from a first to a last of the teeth. The first tooth has a smoothly convexly curved cutting edge, and the remaining teeth have a multi-sided cutting edge defined by three sides of a trapezoid.

Abstract: A self propelled carriage (28) has a housing (30) comprised of a center body section (51) and a pair of side sections (52) hinged (54) to the body section (51). Side sections (52) may be swung to an open "clamshell" like position for lowering of the carriage (28) onto the pipe (10) for travel along the pipe (10). Nozzle (72) for the discharge of abrasive particles, such as sand, are mounted for oscillating movement in a predetermined stroke to cover a predetermined outer surface area of the pipe (10) for cleaning the pipe and for providing a rough finish for the application of a coating.