Abstract: A wet blasting machine having a blasting apparatus wherein slurry is supplied from a main hopper through a supply conduit to a blasting gun. Slurry can be bled from the supply conduit through a control valve into a vessel for collecting a predetermined volume of slurry. The weight of the vessel is measured to generate a first signal which represents the slurry weight, and hence the slurry concentration. The first signal is compared to a second preset signal which represents the desired slurry concentration. If the second signal indicates that the slurry concentration in the main hopper is less than the desired magnitude, then the comparator emits an output signal which activates a supply device for adding additional media to the main hopper. The supply device preferably includes a mixing hopper to which both dry media and slurry from the main hopper are initially fed and mixed, prior to the enriched slurry then being fed into the main hopper.

Abstract: A wet blasting media involving fine particles having a mean diameter less than 0.5 mm, and a specific gravity of at least 1.5. The particles are formed by glass beads having an irregular plastics resin mass therearound, such as a polyacetyl or polycarbonate resin. The resin has a specific gravity of 1.3 or greater. The particles readily uniformly mix with water to permit uniform blasting of articles, and at the same time the glass beads provide the particles with the desired density but do not damage the surface of the articles being blasted.A method of making the blasting particles wherein the glass beads are coated with a coupling agent and thereafter are mixed with the selected resin. The mixture is extruded into a selected shape, such as a rod, which is then pelletized. The pellets are frozen rapidly at a very low temperature, and are immediately crushed or pulverized when in this fragile frozen state so as to form the fine but irregular blasting particles.

Abstract: A machining center having an upright boxlike housing which projects upwardly adjacent the rear side of the table through a substantial vertical extent. The housing defines an interior chamber therein in which is positioned a movable support for mounting a plurality of tools. This housing has a pair of sidewalls which, at their front edges, have forwardly projecting protrusions which overhang the table. A slide is mounted on the upper surfaces of the housing and is movable horizontally in perpendicular relationship to the table movement. This slide, on the front end thereof, mounts a tool spindle head for displacement along a vertical axis. The front wall of the boxlike housing has an opening which extends therethrough and projects vertically up through the top wall thereof, so that rearward slidable displacement of the slide permits the spindle head to be moved rearwardly into the interior chamber to provide access to the stored tools.

Abstract: A wet blasting media involving fine particles having a mean diameter less than 0.5 mm, and a specific gravity of at least 1.5. The particles are formed by glass beads having an irregular plastics resin mass therearound, such as a polyacetyl or polycarbonate resin. The resin has a specific gravity of 1.3 or greater. The particles readily uniformly mix with water to permit uniform blasting of articles, and at the same time the glass beads provide the particles with the desired density but do not damage the surface of the articles being blasted.

Abstract: A machine for finishing lead frames for integrated circuits, including a first rotatable turntable, and a plurality of first cassettes mounted thereon in angularly spaced relationship, each first cassette supporting a plurality of frames in vertically stacked relationship; a second rotatable turntable disposed a selected distance from the first turntable, and a plurality of second cassettes mounted on the second turntable in angularly spaced relationship, each second cassette accommodating a plurality of frames in vertically stacked relationship; a horizontally elongated transfer device extending from tangentially adjacent the first turntable to tangentially adjacent the second turntable for moving individual frames therebetween; a blasting chamber associated with the transfer device for subjecting the frames to a blasting media; a first mechanism for transferring frames from the first cassette onto the upstream end of the transfer device; and a second mechanism for transferring the frames from the downstream

Abstract: A machine for finishing lead frames for integrated circuits, including a first rotatable turntable, and a plurality of first cassettes mounted thereon in angularly spaced relationship, each first cassette supporting a plurality of frames in vertically stacked relationship; a second rotatable turntable disposed a selected distance from the first turntable, and a plurality of second cassettes mounted on the second turntable in angularly spaced relationship, each second cassette accommodating a plurality of frames in vertically stacked relationship; a horizontally elongated transfer device extending from tangentially adjacent the first turntable to tangentially adjacent the second turntable for moving individual frames therebetween; a blasting chamber associated with the transfer device for subjecting the frames to a blasting media; a first mechanism for transferring frames from the first cassette onto the upstream end of the transfer device; and a second mechanism for transferring the frames from the downstream

Abstract: A feed rate sensing system for a drilling machine or the like in which a linearly movable cutting tool-supporting block carries a rotatable tool spindle. Linear motion of the supporting block is converted to rotation of a screw and an encoder driven by the screw generates feed pulses representing feeding of the tool toward a workpiece. A proximity switch unit monitors rotation of the tool spindle and produces rotation pulses in relation thereto. A counter and latch circuit produces a digital output representing the feed rate of the tool-supporting block per revolution of the tool spindle and this digital output is converted to a voltage level representing the actual feed rate. A circuit compares such actual feed rate voltage with a desired feed rate voltage, the difference therebetween being applied to a meter.

Abstract: A wet blasting machine having a slurry reclaiming tank and a clear liquid tank, both located at the lower part of the blasting chamber. An abrasive particle reservoir is located adjacent the blasting chamber and above the reclaiming tank. The inside of the reservoir is separated by a perforated plate into an abrasive particle chamber and a liquid chamber. The lower part of the separating plate defines an outlet for the abrasive particles. A blasting gun is positioned inside the blasting chamber, and a high pressure pump supplies clear liquid to the gun. A slurry-inducing pipe passes through the outlet of the abrasive particle chamber and has one end thereof opening into the liquid chamber, and the other end thereof connected to the blasting gun. A slurry pump supplies the mixture in the reclaiming tank to a liquid-solid separating device wherein the separated liquid is sent to the clear liquid tank and the separated particles are sent to the abrasive particle chamber.

Abstract: A wet blasting machine for permitting deburring of workpieces by utilizing a slurry of water and abrasive particles. The slurry is discharged by a blasting gun against the workpiece, and is then collected within a reclaiming tank. The top water flows from the reclaiming tank into an intermediate settling tank, and the top water is then withdrawn therefrom into a clear water tank. A multiple-section reciprocating pumping unit supplies pressurized water from the clear water tank to the blasting gun, which sucks slurry to the gun from an abrasive particle reservoir located approximately at or above the elevation of the gun. The abrasive particles are supplied to the reservoir from the reclaiming tank.

Abstract: A multi-spindle drilling machine which can perform drilling and tapping using a number of spindles in such a way that by dividing the pitch circle of the holes to be worked into several divisions, all holes are machined by a number of strokes of the spindle head. The setting of the tool spindles is done within a short time by a simple arrangement with the aid of a conventional electronic calculator.