Abstract: A surface treatment attachment for a power tool, for example a sanding attachment for a hand-held power drill, has a body which can be secured to the power tool to be rotated thereby and which is arranged to receive a treatment head (e.g. a sanding disc). With a view to enabling a consistently improved performance to be achieved under a variety of conditions, structure is provided for selecting the degree of eccentricity of the treatment head relative to axis of rotation of the body of the attachment. The degree of eccentricity may be continuously adjustable within pre-set limits and, advantageously, the attachment includes an arrangement for accommodating a tilting movement of the treatment head.

Abstract: An adjustable fly cutter tool for cutting and forming blanks of metal, wood, plastic, glass, etc. The tool can be used on a conventional lathe or milling machine, and enables the operator to continuously change the depth of the cut into the blank without slowing or stopping the tool operation. The cutting tool is mounted on a threaded bar movable in the x and/or y direction and is axially received in a threaded advancement gear which is actuated by a ratchet assembly that extends or retracts the position of the threaded bar holding the cutter as the main gear is rotated. A non-rotating lever journalled around the cutter drive shaft activates the assembly.

Abstract: An offset electrode dresser includes a cylindrical collar having an aperture offset from its axis for retaining an electrode to expose only that area of an electrode tip which is to be dressed. A dressing tool is contained within a chuck which is positioned over the cylindrical collar to align the electrode tip with the dressing tool engaging the electrode in a position offset from the axis of the electrode. The chuck can be rotated by a pneumatic tool at a rate of speed for dressing the offset electrode tip.

Abstract: This invention relates to a holding assembly (10) for connecting a shaft (20) to a drive member (16), the holding assembly has a body (12), first and second end portions (14,18) and a middle portion (21), a member (52) is connected to the body (12) at the middle portion (21) for selectively controllably deflecting one of the first and second end portions (14,18) to preselected relative positions and eliminating runout in the shaft (20). The holding assembly (10) is particularly useful on a boring machine.

Abstract: An adjustable boring tool including an axial shank and a socket for mounting a cylindrical boring bar with an offset axis clamped in adjustable position through transverse and longitudinally slotted segments on one side of the socket together with a transverse screw for clamping the slotted segments against the boring bar. A graduated dial fixed to the boring bar provides calibrated adjustment over a range equal to four times the offset.

Abstract: A workpiece chuck assembly has a head adapted to be fixedly connected to the rotary driven spindle of a machine tool and a chuck member journalled in said head for rotary indexable movement about an axis radially offset from the rotary axis of the head.

Abstract: A method is disclosed for producing accretion-free holes with a diameter of less than 1.5 mm in circuit boards made of plastic. A hard metal drill is employed having a cylindrical chucking shank and a fluted twist section. A central axis of the twist section of the drill is moved eccentrically in relation to a central axis of rotation and therefore to a central axis of the drilled hole while drilling such that a widening of the hole occurs which is at least 20/.mu.m but not more than 50/.mu.m.

Abstract: A clamping device for a dental tool consists of a tubular body whose bore has two coaxially cylindrical, terminal portions and a reduced, slightly eccentric, cylindrical, central portion. A clamping sleeve is conformingly rotatable in one of the terminal portions. Its slightly eccentric bore is of uniform cross section equal to that of the central portion of the body. The sleeve can be turned in the body between a position in which the bore of the sleeve and the central bore portion of the body member are aligned for insertion of a dental tool, and another position in which they clamp the tool.

Abstract: A expandable internal chuck for holding an item is disclosed and has an internal hub adopted to be mounted on a machine, a hub bearing having an axis at an acute oblique angle to the axis of the hub, a sleeve rotatably mounted on the hub bearing and having an internal journal positioned at an acute oblique angle to a sleeve exterior surface, the sleeve is rotatable on the hub bearing from a first position in which the sleeve exterior is concentric to the hub axis to a second position in which the sleeve exterior is at an acute oblique angle to the hub axis and in which the chuck is expanded; also disclosed is a detent and stop mechanism for aligning the sleeve with the hub.

Abstract: A square hole drill having a cutterhead configuration whose outline is in the form of a Reuleaux triangle and which also has a planetary gear drive. Two counter revolving motions are present in the drill at the same time. One is the pure rotary motion of the drill's cutterhead about its own shaft. The other is the circular motion of the cutterhead as a unit about a center line due to its eccentric mounting and drive. To achieve the opposite rotation of the unit as a whole compared to the rotation of the cutterhead about its own axis, a combined meshing planet gear and ring gear are used. The planet gear is directly connected to the cutterhead by a shaft rigidly attached to the gear's front side. At the rear side of the planet gear is the eccentrically mounted drive shaft. Surrounding the external teeth of the planet gear is a larger stationary ring gear with internal teeth to continuously engage the planet gear's teeth.

Abstract: A cutting tool holder for rotatably supporting a cutting bar is provided in which the radial distance between the axis of rotation of the cutting tool holder and the cutting edge of the cutting bar is adjustable. The cutting tool holder comprises a hub member having one axial end secured to a rotating machine and an eccentric bore formed in the other axial end of the hub member. The cutting bar is secured to a bar holder having a shank which is rotatably received in the eccentric bore. A circular drive plate is fastened across the inner axial end of the bar holder and limits axial movement, but permits rotation of the bar holder within the eccentric bore. A compressible biasing member urges axial separation of the drive plate and the housing to functionally lock the bar against rotation during use.

Abstract: Boring bar structure including an adapter having an axis of rotation, an eccentric bore through said adapter having a longitudinal axis parallel to but offset from the axis of rotation of the adapter, adapter spline structure in one end of the bore concentric with the bore, a cylindrical boring bar body having concentric spline structure on one end thereof adapted to mesh with the adapter spline structure in adjusted relative angular positions, the one end of the boring bar body being adapted to fit within the eccentric bore in the adapter with the spline structures in mesh, whereby a cutting tool secured to the other end of the boring bar body may be adjusted radially of the axis of rotation of the adapter on axial movement of the boring bar body within the eccentric bore in the adapter and relative angular movement of the adapter and boring bar body and subsequent meshing of the spline structure with the adapter and bar in a different angular relation.

Abstract: The invention provides a device for positioning and for holding firmly in a desired position with respect to the vertical an electrode for use in electric spark machining apparatus. The device comprises three horizontal discs in register. The top disc attaches to a spindle and the bottom disc accepts an electrode. The top and middle discs are connected by a settable peripherally located loosely fitting screw; and the middle and bottom discs are connected in similar manner, the screws being positioned 90.degree. apart in the horizontal plane. A pair of rotatable ball bearings, each in an upper and lower socket, acts as fulcrums and spacers, permitting the adjacent discs to be held in register, tilted, and held fixedly in two planes. The tilting effort for each pair of discs is provided by a loosely-fitting spring-loaded adjustable screw positioned diametrically opposite the coupling screw.

Abstract: The cutting tool may be employed to shape an internal hole, provide a form to the outer periphery of a workpiece, or shape a hole to a predetermined form while cutting an exterior profile to a desired shape. The tool has a shank with an oval shape flange with a tool-supporting portion having a similar oval shape flange with mating apertures in the flanges. The apertures in the first flange contain a thread while the holes in the second flange are somewhat enlarged. Three set screws are provided in the second flange at each end thereof in engagement with the screws which retain the flanges together. The set screws shift the second flange in any direction relative to the first flange which slopes relative to the axis of the shank so that the tool is offset at an angle to the axis of the shank.

Abstract: The invention relates to an adjustable attachment for metal-working lathes and the like, and the error adjusting method made possible thereby for eliminating runout and axial errors in a manner that makes one adjustment independent of the other. The proposed attachment device basically comprises: a first portion which attaches to the headstock spindle of the lathe; a second portion which holds the chuck; and a third portion disposed intermediate the first and second portions, with all three portions being braced together but free to be moved relative to one another in a sideways or radial direction during error adjustment.

Abstract: A cutting tooth is carried on the outer end portion of a shaft which is eccentrically mounted within a power-rotated boring bar and which may be selectively turned within the bar to enable the tooth to be adjusted between an inactive retracted position and an active cutting position. By sliding the shaft in one direction, serrated rings mounted on the outer end portion of the shaft and within the outer end portion of the bar may be uncoupled to permit turning of the shaft. When the shaft is slid in the opposite direction, the rings are recoupled to establish a torsionally stiff rotational drive to the tooth by way of the outer end portions of the bar and the shaft. Turning of the shaft to adjust the tooth to its cutting position also effects outward adjustment of support pads for maintaining the outer end portion of the bar in a stable radial position during the boring operation.