Abstract: A drill/reamer bit is described that is particularly suitable for high speed operation and which comprises a bit having a "split" pilot or drill portion with four facets and two cutting edges on each web and a "step" or reamer portion having two reliefs and one cutting edge associated with each web, the webs being formed by a pair of flutes angled at from approximately 81/2.degree. to approximately 23.degree., the bit being formed primarily of fine grain tungsten carbide material, the drill portion having an included angle of approximately 118.+-.2 degrees.

Abstract: Automatic backfeed deburring system for holes drilled through non-planar hole end surfaces wherein axially resilient float in the deburring tools accommodate axial variations in the hole burr edges.

Abstract: An improved spade type bit for use in drilling metal, masonry and the like. This bit has a replaceable transverse bar of hardened material in the tip thereof with symmetrical end surfaces sloping away from a central chisel point located on the axis of the bit. One of these surfaces is provided along its length with a groove extending from a cutting lip to the trailing edge, with the groove width and depth at the trailing edge having at least the same dimensions as at the cutting edge. Preferably the dimensions of the groove at the trailing edge are slightly greater than those at the cutting edge. The second of the surfaces has an outer portion with a reduced angle with respect to the axis of the bit as compared to the angle of the inner portion. This construction provides for the accurate drilling of holes in metal, masonry and the like and further accomplishes the drilling at increased penetration rates with the same or lower axial force applied to the bit.

Abstract: A method for reducing the incidence of wire breakage in orthopaedic surgery wherein said wire passes through apertures drilled in bone fragments for effecting a wire connection therebetween during healing. Said method comprises removing stress raising corners or edges, caused by the formation of said apertures, from positions in said bone fragments which are in contact with said wire. Manipulation of an aperturing drill or the utilization of novel radius cutters is utilized in effecting removal of said stress raising edges. The novel rotating radius cutters comprise arcuate cutting surfaces and integral drill or aperture positioning means.

Abstract: The boring and milling head (11) is designed to receive a boring and mill tool (91) provided with a clamping device (55) having a hollow clamping cone (57) and a conical clamping wedge (61), the device being connected in order to resist torsion, to a drive element (21) which may be coupled with a rotary driven boring bar or with another similar mounting. In order to perform a boring and milling in a single operation with the overmentioned boring and milling head (11), without having to change the tool and/or the position of the boring bar or of the work piece, the longitudinal axis of the clamping device (55) containing the boring and milling tool (91) may pivot with respect to the rotation axis (88) of the drive element (21).

Abstract: A rotary cutting tool having at an axial end surface thereof two cutting edge lines arranged substantially in a diametral plane extending through a center of rotation of the tool, one cutting edge line having an inner cutting edge section adjacent to the center and the other having an inner noncutting edge section adjacent to the center. Each of the cutting edge lines has at least one intermediate noncutting edge section. The at least one intermediate noncutting edge section of the cutting edge line having the inner cutting edge section is located within a radial range far from the center larger than a radius from the center of the inner noncutting edge section of the other cutting edge line. The total length of the at least one intermediate noncutting edge section of the cutting edge line having the inner cutting edge section is greater than a length of the inner noncutting edge section of the other cutting edge line.

Abstract: A cutter insert is provided which is adapted to be supported on a flat platform on a cutter body and abutting edgewise against walls upstanding from said platform. The insert comprises a flat block of cutting material in the geometric shape of a parallelogram having a hole extending therethrough between the upper surface and the mounting surface of the block to receive a screw for securing the block to the platform. The upper surface of the block terminates at opposite ends in radii. The cutter insert further includes a rake face and a clearance face on opposite sides of the hole with said upper surface and said faces constituting cutting edges defined by the intersections of said faces and said upper surface, and an angular facet at diagonally opposed ends of said radii so as to form a chip splitter at the juncture of the cutting edge of the rake face and the cutting edge of the angular facet.

Abstract: Drill bit for drilling holes of different diameters which has a series of cylindrical outer surfaces of increasing diameter from the outer to the inner end of the drill bit. A beveled conical surface interconnects each adjacent pair of cylindrical surfaces. At least two flutes are machined at two circumferentially spaced locations to provide two cutting edges on each diameter of the drill. At each cutting edge the cylindrical surfaces are relieved radially and the conical surface is relieved axially over an acute circumferential angle. The major peripheral portions of the cylindrical and conical surfaces for each diameter are respectively concentric to the axis of the drill and of zero pitch angle.

Abstract: A grooving head for cutting an internal helical groove is mounted at one end of a tubular boring bar. The head has two cutter sockets that are axially spaced apart and are azimuthally spaced apart 180 degrees. Cutters are disposed in the sockets and means are provided to adjust the radial distance to which the cutters extend from the axis of the bar and head, the trailing cutter extending farther than the leading cutter. The bar is stabilized by a plurality of wear buttons at its outer periphery, the buttons having convex outer ends and being azimuthally spaced apart and radially adjustably positioned.

Abstract: An asymmetrical drill bit. A masonry-type bit having diametrically opposed, oppositely inclined top walls converging at an apex and having upstanding sidewalls is broken so that diametrically opposed, hollow ground, dished surfaces are formed such that the respective lengths of the top and sidewalls are diminished. The dished portions so formed are asymmetrical to the axis of rotation of the bit, and the structure exhibits a durability that substantially exceeds the durability of symmetrically ground bits.

Abstract: A drill formed with chip discharging flutes in its shank and having a flute width ratio of 0.5 to 0.02 to give increased torsional rigidity to the drill shank, the drill being adapted to form holes, especially deep holes, with an improved cutting efficiency.

Abstract: An end milling tool having an elongate body which has two flutes defining two elongate lands extending generally in an axial direction of the body. The two lands have first and second flute surface each facing in a direction of rotation of the end mill. The end mill carries at least two peripheral-cutting inserts for peripheral milling, an inner drilling insert for cutting a radially inward portion of a hole, and an outer drilling inserts for cutting a radially outward portion of the hole, each insert being replaceable and of a generally flat configuration having a back face held in contact with the appropriate surface of the body, and a front face opposite to the back face and including a cutting edge. The peripheral-cutting inserts are disposed in a staggered manner alternately in the first and second flute surfaces, such that the first flute surface carries the peripheral-cutting insert which is nearest to the end face of the body.

Abstract: A method and machine for machining the surface of a valve seat (3) which is required to have a very accurate alignment with respect to a guide bore of a valve guide (2).In order to be capable of machining the valve seat surface in high roundness while maintaining a high concentricity with the guide bore, a pilot member (4) is moved forward inclinably to catch a guide bore of a valve guide (2) at its front end; the pilot member is further moved forward bendably while following the guide bore; when the pilot member has reached the desired position, the posture of the pilot member in the position is firmly held; and the surface of the valve seat (3) is machined by moving edged tool members (5a) forwardly while rotating the edged tool members (5a) which are arranged coaxially with the pilot member.

Abstract: An attachment for use with a tool having a cutting surface on one end of a bar consists of a collar that has an opening corresponding substantially to the cross-sectional configuration of the bar and is frictionally supported thereon in any angular or axially-orientation. The collar has a support opening which receives a cutter insert that has its inner end supported on an abutment and is releasably retained within the support opening by a recessed fastener.

Abstract: A cutting tool having an upper cylindrical body and a lower cylindrical body with flat surfaces on opposite sides of the lower cylindrical body, a pair of flutes in said lower cylindrical body and one cutting element indexible to three separate positions and another cutting element carried within said flute and means for detachably securing said cutting elements, and a cutting element in the opposite flute having three cutting edges.

Abstract: An annular hole cutter of the type having an annular wall with teeth spaced around the lower end and flutes around its outer periphery. The web thickness between the flutes is about one-half the wall thickness. Each tooth has two circumferentially staggered cutting edges and oppositely inclined inner and outer back-off faces at the bottom thereof. The web is reduced in thickness at each tooth so that the inner cutting edge has a width of about one-third the wall thickness and the outer cutting edge has a width of about two-thirds the wall thickness. The inner and outer back-off faces are alternately vertically relieved so that each tooth produces either one or two chips, each of which is substantially narrower than the depth of the flutes which provide the escape path for the chips.

Abstract: A rotating bit, particularly a rotary bit, is provided with a plurality of teeth incorporating diamond cutting elements of a first and second type. Each type of tooth is particularly adapted to cut a particular type of rock formation. For example, the plurality of the first type of teeth are particularly designed to cut soft to medium-hard rock formations, and the plurality of the second type of teeth are particularly adapted to cut hard or abrasive rock formations. In one embodiment, the first type of teeth are set on the bit face to have a greater exposure from the bit face than the second type of teeth. In that case, the first type of teeth will engage the rock formation first. A second embodiment has the relative disposition of the first and second types of teeth as measured by their disposition from the axis of rotation on the bit reversed.

Abstract: A cutting tool having an upper cylindrical body and a lower cylindrical body with flat surfaces on opposite sides of the lower cylindrical body, flutes in said lower cylindrical body and three triangular cutting elements indexible to three separate positions secured in said lower cylindrical body and means for detachably securing said triangular cutting elements, one of said cutting elements having three cutting edges for each position and the other two of said cutting elements having one cutting edge for each position.

Abstract: A self-drilling screw includes an axially extending screw shank with a leading end and a trailing end. A drill bit is secured to and extends axially outwardly from the leading end of the screw shank. At least one wing extends laterally outwardly from the drill bit transversely of the axial direction of the screw shank and spaced from the cutting edge at the leading end of the drill bit. The wing has a cutting edge facing toward the leading end of the drill bit. The wing extends outwardly beyond the outside diameter of the screw shank and forms an enlarged bore through which the shank can pass without contact with the surface of the larger bore. Each wing has a break-off groove or notch so that it can separate from the drill bit.

Abstract: A drill for fiber filled composite materials which has a relatively blunt tip portion for initiating a hole in the workpiece, followed by an acute reaming portion for enlarging the initial hole with minimal breakout followed by a circular rear-facing cutting edge for removing fibers projecting from the walls of the hole upon retracting the drill through the hole.

Abstract: A method and tool for drilling countersunk holes in a composite of materials having different strength and elastic characteristics. The tool includes a front hole cutting section for initially generating the hole, and a rear countersink cutting section providing an enlarged tapered entrance to the hole. The tool has a single flute which extends axially along the length of the front and rear tool cutting sections. The front cutting section includes a planar end surface which is inclined relative to the tool axis and which defines with the flute and a cylindrical outer surface of this section, a single end cutting point and adjacent radial and longitudinal cutting edges. The rear cutting section includes an outer surface which extends radially outward and axially rearward from the front cutting section, and which intersects a leading side of the flute at an acute angle to define a countersink cutting edge.

Abstract: A rotary reaming and counterboring tool includes a central body (28), a proximal mounting flange (30) and a distal end (36), longitudinal lands (44) and straight flutes (40) between the lands. The lands overhang the distal end of the cutter body and are provided with forward facing (relative to the cutting direction) radial reaming cutting edges (64) at the distal ends of the lands and counterboring radial cutting edges (68) at radially stepped portions of the lands. The lands are generally trapezoidal in cross section and a central bore (56) extends through the central body for accommodating a mandrel that supports the cutting tool and its driving head during operation of the tool to perform a reaming and counterboring operation.

Abstract: To form holes of small diameter, a drill includes a single cutting insert having an active edge portion with two oppositely facing cutting edges. When the drill is rotated, one cutting edge of the insert cuts the center portion of the hole while the oppositely facing cutting edge cuts the peripheral portion of the hole.

Abstract: A cutter device for use in end milling, or profile cutting or combined end milling and profile cutting operations having an elongated tool body with an elongated flute section and an exposed end. A first plurality of cutting flutes, which are spiral shaped, are integral with and extend outwardly from the surface of the flute section. The flutes in the first pair are equidistantly spaced apart and define a first outer diameter. The first plurality of flutes extends along said surface from a point intermediate the ends of the tool body to a first end position on the exposed end. The first plurality of flutes in said first end position defines a first set of cutting blades lying in a first plane of cut for end milling. A second plurality of cutting flutes, which are spiral shaped, are integral with and extend outwardly from the surface beyond the first pair of flutes. The flutes in said second plurality are spaced apart and define a second outer diameter which is larger than said first diameter.

Abstract: A tool for use with a rotary drive is provided with a number of differently formed slots therein to receive different cutting blades in various orientations. The tool is adaptable for cutting in a radial direction and in an axial direction and can accommodate molding head cutters as well as standard 1/4-inch tool steel bits in various combinations with spacer bars to provide different cutting profiles in a radial direction and to permit surface boring and milling in the axial direction.

Abstract: To provide for self-centering of boring tools, particularly of larger diameter boring tools having replaceable rotatable cutter bits, the cutter bit closest to the central axis of the tool holder or tool shank, i.e. the radially innermost bit is formed with auxiliary cutting surfaces adjacent the corners of a square or parallelogram-shaped bit, for example by chamfering the corner, with a relief surface therebehind, and positioning the auxiliary cutting surface to intersect the central axis of the boring tool so that, in operation, a small conical tip will be left which is continuously reduced in size and cut; and wherein the cutter bits are positioned on the tool bodies to present cutting edges at the end face which overlap with respect to workpiece removal, so that each cutter bit will independently cut into the workpiece, at least the inner cutter bit being guided in its cutting circle by the radially outer corner fitting against the surface cut in the workpiece.

Abstract: A drilling and reaming screw is disclosed having a drill tip and a pair of frangible wings as a reaming means. The frangible wings are formed from the shank so that they include inner portions within the shank diameter and outer portions outside the shank diameter. Upon reaching a workpiece of predetermined hardness, the outer portions are adapted to break off from the shank along a line lying entirely beneath the surface of the shank such that no harmful protuberances remain.

Abstract: An annular hole cutter having an inverted cup-shaped body provided with a plurality of circumferentially spaced teeth around its lower edge. Helical flutes extend upwardly between successive teeth and form around the outer periphery of the cutter a plurality of radially relieved lands, each having a circle ground narrow margin at the leading edge thereof. Each tooth has a plurality of radially and axially staggered cutting edges thereon.

Abstract: A skull trepanation drill having a drive shaft, a main cutter engageable with the drive shaft under axial force and a sleeve-shaped housing slidable axially and rotatably on the drive shaft and provided at its free end with an auxiliary cutter. In use, the sleeve-shaped housing is restrained from axial movement on the drive shaft by a locking body extending into recesses in the housing and drive shaft. The housing is manually releasable from the drive shaft for cleaning by rotation of a cam on the latter. The cam moves a lock bolt axially of the drive shaft to a position permitting the locking body to retract from the recess in the housing.

Abstract: A plurality of cutting plates are mounted in a recess forming a mouth at one end of a drill bit and each cutting plate has a plurality of cutting edges. The drill bit mouth provides chip removal. In the cutting position, the cutting plates are arranged in a plane extending in the direction of the axis of rotation of the drill bit and the cutting edges are arranged in a step-wise manner. The cutting plates can be turned for arranging different ones of the cutting edges in the cutting position. The cutting plates extend radially outwardly from the axis of rotation with one plate adjacent the axis of rotation and the at least one other plate extending radially outwardly from it. The cutting plates have a parallelogram shape in the axial plane of the cutting position. In the cutting position, cutting edges of the cutting plates are in parallel relation to one another with adjacent parallel cutting edges on adjacent cutting plates being in contact with one another.

Abstract: A boring reamer with end mill cutters comprising a cutting edge portion, a straight shank and a taper shank. The cutting edge portion is formed at the forward edge of the straight shank, and has, at its forward end, end mill cutters each of which is formed with a chamfer angle portion and a relieving angle portion, and has a reamer, which is slightly larger in the diameter than the end mill cutters and provided with an ultra-left-hand twist right-hand helix angle, and which is formed into a saw-tooth like configuration having a land portion.

Abstract: A combined boring and milling tool has at least three triangularly shaped turnable cutter blades. The effective cutting edge of the first turnable cutter blade extends as bit (or drilling cutting edge) from the periphery of the shank at least to its axis. A second turnable cutter blade is offset 180.degree. peripherally from the first and its effective cutting edge extends as cutting edge on the periphery of the shank parallel to the shank axis. A third turnable cutter blade is offset axially from the first so that its effective cutting edge extends as a cutting edge parallel to the shank axis. The two effective cutting edges of the second and third turnable cutter blades lie on the same flight circle and their working ranges overlap axially. The first and third turnable cutter blades have a common chip space.

Abstract: An indexable insert drill having a cylindrical body with two flutes and a cutting insert mounted at the end of each flute. The cutting inserts are mounted so that each presents a cutting edge of a length less than the radius of the drill with each edge being positioned to provide negative lead and effectively neutral radial and axial rake. The first of the cutting edges intersects the longitudinal axis of the drill body and extends radially outward to an end area spaced inwardly from the circumference of the drill body. The second of the cutting edges extends from an outer end area radially outward of the drill body circumference to an inner end area radially inward of the radial outermost end of the first cutting edge. Preferably, the first cutting edge extends over two thirds of the radial dimension of the body and has an effective cutting length of at least twice that of the second cutting edge.

Abstract: An indexable insert drill employing a plurality of inserts located substantially in a single radial plane characterized by a round innermost insert having its arcuate cutting edge extending across the axial center line of the drill. One or more supplemental inserts, preferably square in configuration and including chip interruption notches positioned for positive axial lead, continue the cutting action radially beyond the arcuate center cut of the round insert with an outermost corner adapted to finish cut the side wall diameter of the hole.

Abstract: A rotary drill bit for hand-held power drills comprises successively, a cutting section of progressively increasing diameter, a section of decreasing diameter and a shank portion for mounting the bit in a hand-held electric drill. The cutting section of the bit comprises a plurality of cutting edges disposed symetrically about the axis of rotation of the bit and extending rearwardly from the apex at an angle to the axis. The cutting edges have cutting portions and noncutting portions which are so-arranged that the cutting portions of one cutting edge cut selected diameters of a hole to be bored and cutting portions of another cutting edge cut other diameters of the hole whereby all cutting edges together cut all diameters of the hole. The sum of the lengths of the cutting portions of all of the cutting edges is approximately equal to the total length of one cutting edge so that the torque required to turn the bit is reduced.

Abstract: The burr formed on the breakout side of a workpiece during a drilling operation is removed by a deburring bit positioned underneath the workpiece in axial alignment with the drill bit. The drill bit is of the twist type and has at least two longitudinal flutes joined by a web and separated by an equal number of longitudinal lands. The deburring bit has a number of radially extending cutting elements which project radially outwardly from adjacent the bottom of each flute to substantially beyond the diameter of the hole. At the bottom of the flutes, the radially extending cutting elements are spaced to pass the web of the drill bit axially therebetween and to engage the flutes when the drill bit is rotated.

Abstract: The drill of the invention comprises a drill head having at least one guide pad, at least one outer cutting insert located at the periphery of the drill head surface and at least one inner cutting insert, having an active cutting edge, located nearer to the center of the drill head surface. The active cutting edge of the inner insert is situated within the outer edge of the guide pad or pads. Preferably, a plurality of cutting inserts are so arranged on the drill head that the resulting cutting force at all engaged inserts is on a level with the outer end of the guide pads.

Abstract: A drill for producing close tolerance holes in non-ferrous and non-metallic composite materials in which the essentially cylindrical size of the body of the drill is maintained all the way to the drilling point, the cylindrical shape as it approaches the drilling point is tapered by being flattened off on opposite sides to taper the body, and the drilling point has symmetrically formed and angularly related cutting edges in the opposite edges of the flattened and tapered body. The drill having the foregoing characteristics may be combined with a countersink formed either separately from or as an integral part of the drill.

Abstract: A drill bit having a central shank having an "S" shaped cutter integrally formed on or detachably secured to the shank. A collar is detachably secured to the shank above the cutter and is keyed to the cutter to prevent rotation of the collar. A generally flat secondary cutter is secured to the collar and has a plurality of depending cutter elements on the peripheral edge thereof as well as a plurality of radially extending chisel cutters depending therefrom.

Abstract: A device is provided for creating recesses for road surface markers in road surfaces which makes initially a cut sufficient to stabilize the device in the desired position and then fragments and discharges core material within a circular cut defining the recess. Such fragmentation is effected by rotation of a plurality of radially disposed cutting edges each spanning only a portion of the radius of the material to be fragmented.

Abstract: A self-drilling thread-forming screw having a first portion which is screw-threaded and adapted to form a screw-thread in the material within which the screw is to be engaged, a head at one end of the first portion, and at the other end of the first portion a second portion of generally smaller cross-sectional size than the first portion and having a drill point at the entering end thereof, and a pair of diametrally opposed wings outstanding from the second portion and each tapering inwardly towards the first portion from a front cutting edge.

Abstract: A compact, multi-purpose power machine which can be safely used by children, including a housing with deep, narrow slots that prevent the insertion of a human finger therein, and cutting tools located within the slots so a child cannot touch them.

Abstract: A self-drilling and reaming screw for clampingly securing a plurality of superimposed panels and providing a clearance hole in at least the upper panel. A plurality of axially spaced wings of differing and increasing radial dimension from the cutting edge of the drill point to the threaded shank portion are provided and located between the upper and lower extremities of the flutes on the drill point.

Abstract: A twist drill bit for drilling through metal and having a cutter recessed in the spiral portion of the drill auger and spring tensioned to be biased outwardly beyond the peripheral surface of the drill to remove burrs raised by the drill bit as it passes through the metal in either direction.