Abstract: A mixing nozzle for producing a high velocity jet of airborne abrasive slurry comprising a cylindrical air passage of a length at least 2.5 times its diameter, a concentric circular chamber surrounding the cylindrical air passage and having a tangential entry for the abrasive slurry, and a nozzle portion having a region tapering from the diameter of the concentric circular chamber to a cylindrical region. The diameter of the cylindrical region should have a diameter lying between 1.2 and 3.0 times that of the air passage and a length at least six times its diameter. The air passage and the concentric chamber with its tangential entry is preferably formed as a replacement insert made from a wear resistant material.

Abstract: An apparatus for cutting a plate (2) and processing the edges of the cut piece parts (7, 8, 9) has a plate-shaped receiving means (1) for a multiplicity of singly drivable rams (14, 14') adapted to be moved in and out. The rough plate (2) out of which the piece parts (7, 8, 9) are to be cut is placed on the rams (14) in their retracted position, and the piece part (8) whose edges (12, 13) are to be processed is moved away from the other piece parts (7, 9) and the remaining piece (10) by moving the rams (14') into the extended position, so that its edges (12, 13) are freely accessible.

Abstract: A cutting insert is disclosed which includes a polygonal plate-shaped insert body having two opposite faces directed in the direction of insert thickness and a plurality of peripheral faces lying between the opposite faces. The opposite faces have marginal edges with at least one of the marginal edges defining a main cutting edge. The peripheral faces intersect one another to form marginal edges with one of the marginal edges defining an auxiliary cutting edge which intersects the main cutting edge. The peripheral surface which includes the marginal edges defining the main and auxiliary cutting edges includes a rake region extending along the main and auxiliary cutting edge.

Abstract: A tool sharpening device (11) has a rotary grindstone (14), a tool support (34) and linear guides (32, 33) along which the tool support (34) is displaceable in use of the device. The linear guides (32, 33) extend transversely of the axis of rotation of the rotary grindstone (14) and their location is such as to guide a tool carried by the tool support (34) so as to transit across the end face (15) of the rotary grindstone (14). The tool support (34) is releasably connected to the linear guides in such a way that the tool support (34) can be positioned on the linear guides (32, 33) with a tool support face (35) lying at one of two different inclinations to the plane defined by the end face (15) of the grindstone (14).

Abstract: A lens surface former and polishing tool of one-piece construction and made, for example, of aluminium, aluminium alloy or a zinc-based alloy with one side surface of the block being of convex form and the other side surface of the block being of concave form, in which, projecting radially from the cylindrical peripheral surface of the main part of the block, is an annular flange or ledge which is interrupted at equi-distant points by four tapered location grooves or slots extending longitudinally of the tool so as to be parallel to the longitudinal axis of the tool, the flange or ledge with its tapered grooves or slots thereby permitting the tool to be quickly mounted on holding means forming part of a lens-grinding or lens-generating machine.

Abstract: A contour rope saw for stones and similar workpieces has a slide (3) mounted displaceably in one direction (x) for taking up the workpiece (4) and an endlessly circulating rope (17) with a horizontal strand (17') between two deflection rolls (14, 15) that are vertically movable on a supporting structure (5). A further deflection roll (16) is spaced from the supporting structure (5) in the sliding direction (x) of the slide (6). The rotational axes (20 to 22) of the deflection rolls (14 to 16) are substantially vertical.

Abstract: A portable surface preparation abrading unit which enables the quick and efficient mechanical removal of a work surface coating or fouling film with low loss and collection of removed material dust and debris for safe disposal thereof so that operations such as boat hull and auto body cleaning or paint removal, for example, may be carried out without an inordinant hazard of contaminating the ambient work area environment.

Abstract: Apparatus and methods for simultaneously cone cutting of crown portions and pavilions of gemstones are provided by the present invention. Each of the gemstones to be simultaneously cut are individually mounted in a motor rotating collet which is mounted on a base plate. One of the base plates is provided with additional motor-driven apparatus to move the plate at an angle of approximately 45.degree. to the axial center line of the gemstone. The second gemstone is rotated by a motor attached to the collet by a support plate. The support plate moves in a direction toward the first gemstone at an angle approximately 45.degree. to the axial center line of the second gemstone and, such that, it is perpendicular to the back and forth motion provided by the motor apparatus of the first gemstone. In this manner, each of the gemstones are simultaneously coned shaped at first its crown portion and then at its pavilion portion or visa versa.

Abstract: A polishing machine comprises a vertical frame 1, a workpiece-carrier plate which is horizontally movable in at least one direction, and a support column 3 vertically movable in relation to the frame and supporting a polishing unit comprising a tool holder 9 carried by a slide 41 driven in translational motion by an eccentric device operated by an electric motor 8. The tool holder thus undergoes an alternating translational or reciprocating motion, and a hydraulic jack 50 is provided to urge the tool holder against the workpiece being polished. The structure for imparting the alternating translational motion is formed by an internal connecting rod-crank assembly 34, 46 mounted in the slide 41.

Abstract: A cutter for producing face gears, comprising a disc-shaped cutter body with cutting teeth (23) fitted on the periphery. The cutting edge (24) of each cutting tooth lies in a surface of revolution which is produced by turning an imaginary gear wheel of infinitely low thickness about the axis (20) of the cutter and simultaneously about its own axis. Each cutting tooth (23) of the cutter is of such a shape that the cutting tooth is re-grindable, without the shape of the cutting edge of the cutting tooth changing as a result. This is achieved through the fact that the profile of each cutting tooth shifts in planes (22, 22a, 22b...) from the cutting edge (24) of the cutting tooth to the rear side thereof in the direction of the axis (20) of the cutter.

Abstract: The invention relates to an abrasive body having a concave abrasive surface, whereby the abrasive body has a plurality of wings bent with the wing tip pointing in the moving direction. Each wing has a coolant duct in communication with a central opening in the abrasive body.

Abstract: A device for subdividing semiconductor bars into wafers comprises a grinding tool having two concentrically arranged grinding discs. A rough grinding disc is arranged inside of an outer smooth polishing grinding disc. The grinding tool grinds a lower face of a semiconductor bar to a smooth planar form. A first electrolytic truer operates in conjunction with the outer smooth polishing grinding disc while a second electrolytic truer operates in conjunction with the inner rough grinding disc. The truers are arranged to define an axial offset between the grinding surfaces of the grinding discs so that a lower face of the bar is smoothed. The device also has a slicing tool for slicing the bar into wafers which will have a smooth planar form.

Abstract: A two-tier groove cutting circular saw blade includes a circular core having sectors defined in circumferentially spaced relation to one another along the periphery, and lands defined in circumferentially spaced relation to one another between the periphery and center of the core. Pluralities of outer and inner cutting segments are secured to the respective core sectors and lands. First and second pluralities of anti-undercut elements are defined on the core respectively between the center and periphery thereof and along the periphery thereof between preselected ones of the lands and sectors for defining first and second exit paths away from the inner and outer cutting segments for flow of material particles generated from the cutting of the groove and flushing of the groove by fluid coolant so as to reduce wear and undercutting of the core adjacent to the inner and outer cutting segments.

Abstract: A blast nozzle apparatus for directing abrasive particles against a surface to remove therefrom adherent materials includes a flow straightener intermediate the blast nozzle and flexible supply hose so as to rehomogenize the abrasive particles throughout the total area of the blast nozzle inlet and counteract the nonuniform concentrating effect on the blast media as the abrasive particles are being carried through the bends and turns of the flexible supply hose. The flow straightener includes a rigid longitudinal bore between the supply hose and blast nozzle inlet.

Abstract: A rotatable sharpening device which includes a mounting shaft, and a sharpening head integral with the mounting shaft and having a disc-like sharpening face distal from and co-axial with the mounting shaft. The sharpening head is substantially in the form of a shallow frusto-cone having a base coated with fine particles of diamond to constitute the sharpening face, and having a chamfered rim portion adjacent the sharpening face. The upper surface of the sharpening head is shaped to allow lubricating fluid to lubricate a workpiece by flowing along the upper surface to the edge of the sharpening face.

Abstract: Current manual vacuum sanders do not adequately capture dust from around the edges of the sander. The present invention provides a back-up pad for a vacuum hand sanding device for sanding a working surface, where the device is of the type comprising a tailpiece for connecting a source of vacuum, a base for attaching a back-up pad and screw clamps for releasably attaching an abrasive, air-permeable sheet.

Abstract: A fixture for use in non-encapsulated cross-sectioning of a sample adapted to permit adjustment of the angle of cross-sectioning having a mounting block with front and bottom surfaces and a recess extending through the front and bottom surfaces. An elongate saddle having first and second end portions is pivotably mounted in the recess on the mounting block. A resilient member is disposed between the mounting block and the second end portion of the elongate saddle for applying a yieldable force between the mounting block and the second end portion. A set screw is threaded into the mounting block and engages the first end portion of the elongate saddle for adjusting the position of the first end portion of the elongate saddle with respect to the mounting block. A sample holder is mounted on the elongate saddle for holding the sample.

Abstract: An improved toolholder assembly and method is provided that comprises an adjustable nozzle for redirecting a liquid coolant stream from a direction generally parallel or slightly oblique with respect to the axis of rotation of a workpiece to a direction that is substantially orthogonal with respect to this axis. The nozzle assembly includes a threaded base on one end and a nozzle head on the other, and the threaded base may be screwed into or out of a threaded opening in the toolholder body which communicates with the original coolant stream opening in order to adjust the nozzle head at both a desired angle in a plane orthogonal with respect to the axis of rotation of the workpiece, as well as at a desired point along this axis.

Abstract: A notch of a semiconductor wafer is accurately and efficiently chamfered by the use of an apparatus which comprises a rotary disk grindstone, a wafer retaining mechanism for disposing the surface of a wafer so as to intersect the surface of the grindstone, a first drive mechanism capable of rotating the wafer within a prescribed range of angle around the central axis perpendicular to the main surface of the wafer thereby continuously positioning the surface of a notch of the wafer subjected to grinding relative to the grinding surface of the grindstone and effecting required grinding, a second drive mechanism capable of causing the grindstone and wafer to be relatively moved forward and backward in the radial direction of the grindstone, a third drive mechanism capable of causing the grindstone and wafer to be relatively moved forward and backward in the direction of thickness of the wafer, and a profiling mechanism capable of relatively guiding the notch and grindstone and consequently chamfering the notch i

Abstract: To keep, with a simple structure, roller bearing devices, rotatably supporting the end sections of two rollers, at the same and substantially constant temperature, working fluid is applied not only to the slicing sections, but also to roller bearing devices 14b, 14c, 16b, 16c, 18b and 18c. The flow rate of the working-fluid supply to nozzles 20, 22 for slicing-section is controlled in such a way that the temperature of the working fluid coming down from the slicing sections becomes a first preset temperature; and the flow rate of the working-fluid supply to nozzles 24-29 for bearing-section is controlled in such a way that the temperature of the working fluid coming down from the bearing sections becomes a second preset temperature.