Abstract: A single-lip solid drilling tool has a one-piece shank with an integral head having a radially or diametrically extending groove for a blade with an eccentric tip. The blade is held in its groove by several clamping screws so that it can be removed for sharpening or for replacement with a fresh blade. One or both lateral portions of the blade extend beyond the periphery of the head to guide the tool in actual use. The shank has an eccentric coolant hole whose discharge end is adjacent the blade and which is formed by providing a short cylindrical hard-metal blank with an eccentric axially parallel bore before the blank is stretched to reduce its diameter to a requisite value and to simultaneously reduce the diameter of the bore. The stretched blank is then machined to provide it with one or more chip evacuating flutes and, if necessary, with one or more grooves for discrete guide members which extend beyond the peripheral surface of the head.

Abstract: A deep-bore drilling machine consists of a deep-bore drilling unit (1) which is driven by rotation and has a deep drill tool (4, 7). The front end (7) of the deep-bore drilling tool (4) is led into the drill bushing (10) at the beginning of the drilling operation. The drill bushing (10) is thereby contained in a main spindle (22) and is replaceable. Also, the main spindle (22) can also be driven independent of drive (2) of the deep-bore drilling unit (1) by another drive (30).

Abstract: A deep boring machine is described which has a spindle unit (2) with a horizontal spindle shaft (40) for receiving a boring tool (50). The spindle unit is horizontally displaceable on a machine bed (1) and is driven by a spindle drive mechanism (2). The boring head (6) is guided, upon initial boring of the workpiece (11), in a jig bushing (7) which is disposed in a jig bushing holder (13). The jig bushing holder (13) is displaceable on a guide (25, 26) in the direction of the spindle shaft (40). The guide (25, 26) is disposed above and offset parallel (h.sub.1, h.sub.2) from the spindle shaft (40) and extends at least partly beyond the machine bed (1). A workpiece clamping table (19) is disposed adjoining the machine bed (1) and is adjustable independently thereof.

Abstract: In known deep-hole drilling machines, the undesirable situation arises, in the case of large drilling depths, that the boring bar, which becomes increasingly softer with increasing drilling depth, sags and starts to vibrate, so that the boring bar must be supported. This should, however, be possible at suitable spacings in the simplest possible manner and without interrupting the working process. For this purpose, it is envisaged that at least one guide bush for supporting the boring bar in a workpiece bore is provided on the boring bar, the guide bush being associated in a coaxial arrangement with a clamping ring of a ringe thickness which makes self-jamming tilting on the boring bar possible, and which clamping ring is pivotally coupled at one peripheral point to the guide bush to permit a small radial movement and has an external diameter smaller than that of the guide bush, and that at least one disengageable stopping device for a guide bush is provided within the coolant feed device.

Abstract: A reamer comprises a single, adjustable, elongate carbide blade clamped in position in an axial slot in the reamer periphery by means of a clamping plate, with the slot having a positive rake blade supporting fade so that the blade is adjustable along a line parallel to a tangent to the reamer periphery.

Abstract: Portable handheld device for electricians, plumbers and builders to use to form in one operation perfectly aligned, craftsman-like holes through a soffit and a roof above, or through a ceiling and a roof above, through which aligned holes an electrical conduit, soil stack or vent pipe, chimney pipe, or the like, may be installed.

Abstract: A drill bit comprises a body of a cylindrical shape having a straight groove of a generally V-shape formed in the circumferential surface thereof and extending along the longitudinal axis thereof. The bit body has a drilling fluid passageway extending longitudinally therethrough. One of the two side faces defining the longitudinal groove has a radially inwardly-disposed convex surface of a semi-cylindrical shape and a flat surface extending radially outwardly from the semi-cylindrical surface of the periphery of the cylindrical bit body. The semi-cylindrical surface terminates at its forward end in an arcuate inward cutting edge while the flat surface terminates at its forward end in a straight outward cutting edge. The arcuate inward cutting edge is offset from the straight outward cutting edge when viewed from the forward end of the bit body.

Abstract: A drill assembly comprising a tool bit of the type including a slot at one end for receiving a cutting element. A positioning clip removably disposed in the slot and having a cutting element engagement structure for maintaining the position of the cutting element within the retainer clip, and drill body engagement structure for locating and maintaining the position of the clip within the slot of the tool bit.

Abstract: A reamer has a head with a recessed bearing plane which absorbs the pressure of a clamping member which presses against one side of a cutter knife. A counter member is positioned with one side displacable on the recessed bearing plane in the direction of increased cutting diameter. The cutter knife is held between the clamping member and the counter member. The counter member has a region with a straight holding portion which supports the cutter knife. The clamping member and counter member have congruent oblong holes which extend in the direction of increased cutting diameter. These holes are traversed by a clamping screw which is screwed into a threaded hole in the head. When the screw is tightened, the three piece unit of clamping member, cutter knife and counter member are tightened in the reamer head.

Abstract: A one-lip tool for deep drilling has a drill shaft, and a clamping sleeve and a drill head arranged at the opposite ends of the drill shaft. The drill shaft has a peripheral surface including two diametrically opposite surface portions. A chip groove is provided in one of the surface portions. A reinforcing formation, such as at least one inwardly extending rib, is provided in the other opposite surface portion of the drill shaft.

Abstract: A drill having at least two indexable radially spaced inserts arranged with axially projecting cutting points to machine overlapping concentric grooves, the outermost insert machining a groove having an outside diameter equal to the diameter of the hole and the innermost insert machining a groove overlapping the center of the hole, and radial components of the cutting thrust on said inserts being in opposition and balancing each other. The cutting thrust may be balanced by the number, shape and/or the rake of the cutting edges.

Abstract: The present boring head is constructed for drilling or boring deep holes or bores of substantial axial length whereby so-called veering off from the longitudinal boring axis is to be prevented. For this purpose three cutting members are distributed about the circumference of a base in such a manner that the cutting members are located at 0.degree., 95.degree., and 190.degree. with a position tolerance of .+-.5.degree. for each cutting member relative to a polar coordinate system. At least one guide rod is arranged at an angle of 55.degree. and another guide rod is located at an angle of 305.degree.. Each guide rod position may have a tolerance of .+-.10.degree. in said polar coordinate system.

Abstract: Internal cyclindrical surfaces are machined with a machining head movable longitudinally along the internal surface. The machining head carries at least one cutting tool having a cutting edge and a chip deflecting surface positioned for deflecting metal chips toward the trailing end of the machining head.

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 device for machining the internal wall of a cylinder has a tool head with a shank securable to a rotary and axial movable boring bar. Mounted on the periphery of the tool head are a deep hole boring bit, a paring bit and a pair of obliquely mounted smoothing rolls. There is a passage for coolant to the boring bit which decreases in size in a direction opposite to the machining direction so that the coolant is accelerated in the passage to enhance cooling and flushing of swarf. A pair of radially adjustable supporting blocks assist in supporting the tool head in the cylinder and are substantially coplanar with the boring bit. The paring bit is disposed closely behind the plane in which the blocks and the boring bit lie. Downstream of the boring bit, the coolant passage is wider and has a constant cross-section area for a limited extent. The tool head further includes a bush having a helical channel therein for passage of some of the coolant to act as a lubricant.

Abstract: A tool shaft is detachably fastened in a tool holder by means of a plurality of gaskets which are each sandwiched between a pair of press rings. The tool shaft extends through the press rings and gaskets. A screw is provided for compressing the gaskets between the press rings. The gaskets are disposed in recesses of larger volume. The gaskets are nonsymmetrical about the longitudinal axis of the tool shaft. When compressed, the gaskets force the tool shaft laterally against the rings to prevent radial misalignment of the tool shaft.

Abstract: A rotary drill comprises a shank, two axially extending chip removal recesses, and at least two radially oriented cutting inserts. One insert is peripherally located and is arranged adjacent one of the chip removal recesses. The edge of the peripheral insert extends radially so as to form the wall of the hole to be drilled. Another insert is located radially inwardly of the peripheral insert and is arranged adjacent the other chip removal recess. The inserts extend axially to generally the same extent. The inner insert is offset from a 180 degree relationship with the peripheral insert by an angle, which angle is of such magnitude that the drill is radially balanced.

Abstract: An indexable insert drill employing a pair of radially opposed inserts having either positive or negative axial lead cutting edges extending in the same cone of revolution. One of the inserts has a radially inner arcuate corner intersecting and extending across the axial center line. The other insert is located relatively overlapping but outward radially with an outermost corner adapted to finish cut the side wall diameter of the hole. Insert cutting edges provide for chip interruption and breakage.

Abstract: A horizontal boring mill for machining work at a high rate. The boring mill includes a massive boring bar which carries intermediate its end the boring-tool holder from which boring tools extend radially. The boring bar is rotated by a first drive of sufficient power to enable the boring tool to take a deep cut in the work at a high rate. The boring bar is rotatable on bearings of substantial area; a bearing between the first drive and the bar and bearings on each side of the work. The bar, the first drive and the bearing between the first drive and the bar are moved along the bed of the boring mill by a second drive so that the boring tool engages and cuts the work. The other bearings are secured to the bed and the bar is moved through them. Each bearing on each side of the work carries a facing tool which is rotatable by the bar as the bar is rotated but is not movable with the bar. These bearings may be adjustably secured along the bed so that the facing tool is in position to face the ends of the work.

Abstract: A boring tool with a variable length extension formed by a standard piece of pipe, for particular use in drilling downwardly from a wall studding header and through a fire brake bracing member which extends between the wall studs below the header, to facilitate the installation of piping, electric conduits, and the like, wherein a standard piece of pipe is threadedly connected by a coupling member at one end to a first shank portion of a boring tool, and a coupling member at its opposite end to an axially aligned second shank adapted for connection with a driving instrumentality. The coupling member in a modified form is provided at its pipe connection end with internally stepped threaded portions for selective connection with the ends of pipes of different diameter.

Abstract: A deep-hole boring head comprising a body member arranged to support a boring tool at one end and to be attached to a boring bar at the other end, the body member being provided with a number of guidance members in strip form adjustably mounted thereon and arranged during use of the boring head to contact the surface of the hole bored by the boring tool so as to guide the tool during the boring of a deep hole, and adjustment means connected with the guidance members and arranged, on movement of the guidance members in directions substantially parallel to their longitudinal axes, to adjust the radial distances of the guidance members from the center line of the hole to be bored.