Abstract: This invention pertains to an indexable and invertable cutting insert having cutting edges and a positive rake surface which appears convex when viewed in cross section.

Abstract: A rotary disc rasp formed from a dish shaped rigid metal plate. Holes are punched or drilled through the plate in the direction of rotation and the rear edges of the holes are forced outwardly relative to the convex side of the plate to provide cutting teeth thereon. The cutting teeth define a curved cutting area on the plate whereby engagement of the cutting teeth with a work piece can be controlled. The plate is preferably mounted to a right angle grinder which rotatably drives the rasp for controlled removal of material as required for shaping and fitting in a sculpture or construction operation.

Abstract: A thread cutting attachment for use with conventional type engine lathes for the purpose of semiautomatically cutting threads externally on a workpiece, or with a modified embodiment, internally of a workpiece. Each attachment has structure for securely affixing same to the conventional cutting tool holder of such a lathe. A main body of the attachment has a movable cutting tool holder therewithin. The cutting tool holder is suitably actuated through mechanical means from the energization of a fluid cylinder having a piston with rod extending therefrom. Suitable fluid control structure is connected to this fluid cylinder for actuation thereof under the control of either electrical, pneumatic, or hydraulic control apparatus.

Abstract: An improved machine tool includes a chip conveyor assembly which includes a conveyor and a coolant tank. The chip conveyor assembly is movable between a closed or operating position and an open or exposed position. In the closed position, the chip conveyor assembly is disposed directly beneath a work area so that chips fall onto the conveyor. The chips are transported through an opening at one end of the machine tool to a discharge area where the chips are deposited in a suitable receptacle. To facilitate maintenance of the chip conveyor assembly, the entire chip conveyor assembly is movable through an opening in the front of the machine tool to an open position in which the components of the conveyor are accessible.

Abstract: A worm screw has two threaded portions of opposite hand cut on a single shaft, using a lathe. Several passes of the cutting tool are used to form each of these threaded portions, and in order to provide a compact and robust worm screw of this type the two threaded portions are separated by a groove having a depth shallower than that of the threads being cut and having a width at least equal to 15% of the greater axial pitch of the threaded portions.

Abstract: A method of machining a workpiece, which is rotatable about a first axis, by a tool pivotable about a second axis parallel to the first axis and drivable about a third axis perpendicular to the second axis. To allow the circumference of the workpiece to be machined off-center without the necessity of moving the first or the second axis transversely to the plane defined by these two axes, the workpiece and the tool are rotated or pivoted about the first or second axis, respectively, at the same time, in the same direction and at the same angular velocity and, simultaneously the second axis is displaced transversely to the first axis at such a velocity that the equation X.sup.2 =Y.sup.2 +A.sup.2 always applies, wherein X is the distance of the second axis from the first axis, Y is the distance of the first axis from the plane defined by the second and third axes and A is the distance of the second axis from the vertical projection of the first axis onto this plane.

Abstract: A milling cutter for cutting the contaminated surface of concrete and used at the time of repairing and dismantling nuclear facilities. The milling cutter is characterized in that guide grooves are provided on the outer surface of a body, with their edges slanted from both sides of the body toward the center thereof, and that cutter chips are located along the stepped edge of each of the guide grooves in such a manner that the cutter chips can be easily detached and that those located along the stepped edges of the adjacent grooves are symmetrical in relation to the center line of the body.

Abstract: A numerically controlled turning machine comprises a main spindle (H.sub.s) and at least two cross slides (K.sub.1,K.sub.2) each provided with a saddle (W.sub.1 and W.sub.2, respectively). Another saddle (W.sub.3) is provided at the main spindle end. The cross slide (K.sub.1) is provided in addition with a driven tail spindle (G.sub.s). The control of the machine is subdivided into a first control system which includes X-axis and Z-axis controls as well as C-axis control with positional adjustment and a second control system which does not have any C-axis control but does include X-axis and Z-axis controls.

Abstract: The invention describes a method and a device for processing by chip-cutting of workpieces. It is preferentially applied for the cross-cutting and chamfering of extruded plastics material tubes. A chip-raising or cutting tool may be fed forward radially with respect to a rotational displacement of the workpiece in the direction of a center of relative rotation. An undulant approach motion is superimposed over the feed motion of the tool. The undulant approach motions of two directly consecutive revolutions are displaced in phase. As a result chip cuttings of uniform and predetermined length are produced with consequent facility in removal and avoidance of interference with the cutting operation.

Abstract: A conical cutting insert. The insert is comprised of a body member with first and second end sections oppositely disposed from a median plane. One or both of the end sections may be provided with a cutting edge. The cutting edge is formed by the intersection of an interior outwardly tapered cutting surface and an exterior inwardly tapered flank surface. The cutting surface may be frustro-conical or one or more planar surfaces. The flank surface may be frustro-conical or one or more planar surfaces. Where planar surfaces are utilized, the cutting edges are linear. Where frustro-conical surfaces are utilized, the cutting edge is circular. A plurality of coolant flow orifices are provided to allow the flow of coolant on one or both of the flank surface and cutting surface. Chip flow grooves may be provided on the cutting surface to guide and/or break chips during the cutting operation. Lobes may be provided on the flank surface to provide a constant flank angle during the cutting operation.

Abstract: A unique lens (10) having a peripheral carrier surface (13), a central optical zone (18) providing the toricity required to achieve a given spherical and cyclinder correction that is oriented to a selected axis angle (.psi.) and an intermediate, annular, transitional surface (15) between the optical and carrier surfaces (16 and 13). The method and apparatus for providing such a toric lens (10) employs a generator (50) that produces a sinusoidal signal in response to rotaton of the lathe spindle (26), and a signal that is selectively phased at a predetermined angularity with respect to the circumference of the rotatable spindle (26). The aforesaid signal is applied to a tool post oscillator (90) in order to oscillate the tool (36) in synchronization with rotation of the spindle (26) thereby cutting both curves of the toric surface (16) in one pass.

Abstract: A replaceable tool is comprised of a tool holder forming a hole providing an engageable ditch on the insert end of the shank, a fitted hole for detachably fitting the shank of this tool holder therein and a sleeve providing a plurality of locking balls to be engaged and removed from the fitted ditch of the tool holder in the fitted hole. In the interior of the fitted hole of the sleeve, the locking balls are pressed on the engageable ditch and the draw collar for applying attraction in the axial direction of the sleeve is slidably provided. When the shank of the tool holder is fitted in the fitted hole of the sleeve, the head portion end of the tool holder is designed to be pressed on the end flange portion of the fitted hole of the sleeve, and when the draw collar is pulled in the axial direction of the sleeve, the shank portion is expanded through locking balls so as to be pressed on the inner wall surface of the fitted hole of the sleeve.

Abstract: A three-sided indexable, detachable insert having a positive rake for a cutting tool. The insert has three edge faces and two side faces, each edge face having one or more recesses which extend across the whole of the edge face, substantially transversely to the cutting edge formed where each edge face meets one of the side faces of the insert. The recesses are spaced apart from a plurality of coplanar lands, the number of recesses on each edge face being the same. The width of the recesses is the same as half the width or less than half the width of the intervening lands. Each intervening land is positioned such that is provides in operation a cutting edge to wipe the material left by the recesses of any of the other sides.

Abstract: An end milling tool having a positive axial rake angle in side elevation to facilitate removal of chips from the surface of a workpiece and a curved cutting edge having a neutral (zero) to positive rake angle in bottom plan view as it progressively cuts to enhance chip removal while precluding welding at the work area and enabling the use of a low cutting force. The tool cutting area is formed by a rhomboid-shaped indexable cutting insert at one end having an angular axial rake with a unique curved surface in side elevation provided with a lead corner and a strong included angle in an end elevational view. Other inserts are mounted on the tool above the rhomboid insert to form the remainder of the cutting area and are circular in side elevational view. Each of the rhomboid and circular inserts are mounted in an insert seat having a 60.degree. conical configuration to obtain maximum rigidity in seating of the insert.

Abstract: The invention relates to an indexable cutting insert having a polygonal basic shape for chip forming machining, preferably for milling. The insert comprises an upper face and a lower face and edge surfaces connecting them. Each corner portion of the insert comprises a plurality of chamfers arranged at the transition between the connected edge surfaces, a first chamfer of which forms a minor cutting edge at the line of intersection with the upper face. At least two further planar, second chamfers are arranged between the first chamfer and the associated edge surface, said second chamfers forming an obtuseinternal angle with each other and forming cutting edges with the upper face and therefore the cut chip avoids compressing and avoids a quick destruction of the corner portions of the insert.

Abstract: The invention relates to an insert, preferably for turning. The insert, which has a triangular basic shape, has three chip breakers in its upper flat face. A cutting edge is formed at the intersection line between a chip breaker and an edge surface. The chip breaker is formed with a conical rake face inside an associated nose portion. The chip breaker consists of an outer part and an inner part. The inner part is mainly planar and its termination at the nose portion deviates from the general direction of the inner part in order to guide and control chips during finishing.

Abstract: A lathe for cutting an aspherical surface on a workpiece, such as a contact lens blank, comprises a headstock mounted for linear reciprocating movement relative to a radius cartridge having a tool post for mounting a cutting tool so that the tool can swing at a preset radius about an axis perpendicular to the rotational axis of the headstock spindle in the same plane as the spindle axis. The radius cartridge is coupled to the headstock via an eccentric mechanism, a connecting rod and a slidable bearing assembly for the headstock leadscrew so that the headstock is reciprocated in synchronism with oscillating movement of the radius cartridge to cause the tool to cut a predetermined aspherical surface on the workpiece. The headstock may be intermittently advanced towards the cutting tool, independently of its reciprocating movement and while the cutting tool is stationary, by means of the leadscrew in order to provide for incremental removal of material from the workpiece.

Abstract: Machining the circumferences of workpieces, particularly piston rings, in a variety of out-of-round contours and diameters requires only a single copying disc having a basic out-of-round contour. The copying disc is driven in synchronism with the angle of rotation alpha of piston rings to be machined by a direct current servomotor and, in order to generate the desired out-of-round contour, is caused to deviate from its synchronous movement by pulses received from a computer for the leading and lagging difference angles of rotation delta phi. An adjustable coupling member is provided between a copying disc sensor (such as a double lever) and the tool holder for transferring the out-of-round contour from the copying disc to the workpiece.

Abstract: A high speed toolholder for driving a small high speed cutting tool from the large slow speed spindle of a machining center comprises a housing having a retention pin extending from side end thereof. An input shaft, dimensioned to be received in the machining center spindle, is rotatably journaled into the toolholder housing parallel to the retention pin. Rotatably journaled into the opposite side of the housing so as to be coaxial with the input shaft is an output shaft whose distal end has a tapered bore therein dimensioned to receive the shank of a high speed cutting tool. Within the housing, each of the input and output shaft carry a separate one of a pair of sheaves which are each lined by a V-belt to a separate one of a pair of sheave members on a step sheave rotatably journaled in the housing parallel to the input and output shaft.

Abstract: A cutter insert of the indexable type for a rotary cutter includes a body of a plate of a generally circular shape and having three notches of a V-shape formed in a circumferential face of the body in equally circumferentially spaced relation, each V-shaped notch being defined by a pair of first and second opposed walls. A front face of the body cooperates with the circumferential face, interrupted by the three V-shaped notches, to define three arcuate convex cutting edges each having a leading and a trialing end. A marginal portion of the front face disposed adjacent to and extending along each cutting edge serves as a rake surface for the cutting edge, the rake surface being recessed adjacent to the first wall of the V-shaped notch so as to slope toward a rear face of the body toward the first wall to provide a convex portion extending between the front face and the first wall.