Abstract: A thread forming tap having a complete thread portion, formed with a predetermined back taper with that decreases rotational torque during tapping work, which reduces load acting on first complete protruding portions, formed at an extreme leading end of the complete thread portion, and thereby suppressing degradation in service life of the tool due to wear.

Abstract: The present invention provides a method for manufacturing a fitting that has a configuration where a fitting plate and a blind nut are integrally formed and also provides a tap tool for use in this method. According to the present invention, performing tap processing to an internal diameter portion to integrally form a portion corresponding to the blind nut, when a tap tool having a protrusion at an end thereof is utilized to be inserted into the bag-like blind hole at a planned part of the blind nut and the tap processing is carried out, the protrusion provided at the end of the tap tool comes into contact with an inner wall at the end of the bag-like blind hole, and a pressed material thereby forms a convex shape on an outer side of the bag-like blind hole.

Abstract: In FIG. 2, a diameter Dd of drilling edges of a drill is selected smaller than a valley diameter d1 of a male thread of a tap portion, and an inner diameter D1 of a female thread is defined by the valley diameter d1 of the male thread. Therefore, a predetermined radial gap is formed between the male thread 30 formed by the tap portion and the drill. When a tap with the drill is reversely rotated to be pulled out from the female thread after cutting the female thread, the tap released from the restriction may defectively displace in the diameter direction upon pulling out the male thread of the tap portion from the female thread. However, the drill hardly contacts with the female thread, so that the occurrence of the defective product due to the contact is suppressed.

Abstract: A tool for producing a thread such as an internal thread, can include at least one cutting region having at least one cutting edge and at least one thread-forming region. In general, the cutting region(s) and the thread-forming region(s) are coupled or connected to one another in such a way that they are rotatable or rotate together about a tool axis. In addition, at least one cutting region is at least partly formed on a front-face tool end and/or adjacent to a front-face tool end. Furthermore, a front-face recess that is configured for receiving chips is formed on the front-face tool end.

Abstract: A tap for forming threads in a workpiece is provided. The tap includes a shank having a first end adapted for insertion in a hand tool and a second end. The tap also includes a threaded shaft portion extending from the second end of the shank, the shaft portion includes a substantially uniform diameter and threads. The tap further includes a substantially cylindrical tip extending from the shaft portion. The tip has a diameter less than the diameter of the shaft portion and a length sufficient to co-axially align the tap with an sized opening of a workpiece to be tapped.

Abstract: The invention relates to a drill thread milling cutter (1) for producing a bore and for the subsequent milling of a thread in the bore, said drill thread milling cutter (1) having a working region (2), on the circumference (3) of which a number of drilling and milling cutting edges are arranged. A number of milling cutting edges (7, 8, 9, 10) greater than the number of drilling cutting edges (17) by a factor greater than 2 are arranged or are effective in the direction of rotation.

Abstract: The tool for producing a screw thread in a workpiece comprises a) at least one thread-producing region, which comprises a1) at least one thread-milling region, which operates by removing material, as well as a2) at least one thread-forming region, which operates without the removal of material, b) such that the thread-milling region(s) and the thread-forming region(s) of each thread-producing region b1) are coupled or connected to one another in such a way that they rotate or can be rotated together about a tool axis, and b2) are disposed along an outside circumference of the thread-producing region so as to be offset from one another, i.e. situated one behind the other or following one another, in a direction of rotation about the tool axis.

Abstract: Methods and tool for simultaneously forming a bore in a work piece and forming a series of threads in said bore. In an embodiment, the tool has a predetermined axial length, a proximal end, and a distal end, said tool comprising: a shank located at said proximal end; a pilot drill portion located at said distal end; and a mill portion intermediately disposed between said shank and said pilot drill portion. The mill portion is comprised of at least two drill-tap sections of predetermined axial lengths and at least one transition section of predetermined axial length, wherein each of said at least one transition section is sandwiched between a distinct set of two of said at least two drill-tap sections.

Abstract: A drilling tool consisting of a drill shank having a drill point and of a transition section which adjoins the drill shank in the axial direction and which merges into a clamping shank, the transition section being heat-treated in such a way that it has higher bending elasticity compared with the clamping shank and/or the drill shank.

Abstract: A self tapping bolt which fastens a mounting member and a receiving member while the bolt cuts internal threads on an inner surface of a tap drill hole prepared in the receiving member. The bolt includes at least one groove formed near an end of a threaded portion of the bolt and a blade for cutting the internal threads. The bolt includes the feature of the blade being formed only on a rear end surface of the groove relative to a rotational direction of the bolt which is screwed into the tap drill hole.

Abstract: A thread cutting milling tool comprises a shank with a working portion formed with a recess for receiving a thread cutting insert. The thread cutting insert has one edge formed with a line of thread-form teeth of identical profile. The thread cutting teeth project laterally for cutting engagement with a work-piece while the tool spins about its axis. The tool also orbits within or about a work piece, and in one orbit of the tool in a helical cutting path relative to the work piece a number of complete turns of the screw-thread are formed which is equal to the number of teeth of the insert in engagement with the work-piece. A secondary cutter carried on the thread cutting milling tool provides for formation of a pilot portion or counter bore on the work piece at an end of the screw thread. The pilot portion or counter bore provides for alignment of a threaded member which is to engage the screw thread.

Abstract: Since the chip-breaking groove 30 is cut in the inner peripheral surface of the prepared hole 22 by compressing the chip-breaking tool 10 into the prepared hole 22 prior to the tapping process (the cutting process of the female thread) by the cut tap, the chip can be securely broken by the chip-breaking groove 30 and well discharged even in the case that the work 20 is made of the material having the high ductility. Accordingly, for example, as shown in FIG. 10, it is possible to prevent a lot of long connected chips from entwining the tap, it is unnecessary to monitor the tapping work, and it is possible to achieve a complete automation (an unmanned work). Further, it is possible to inhibit the cut tap from being broken due to the pinching of the chip, and it is easy to execute a treatment such as a chip cleaning or the like.

Abstract: A thread cutting milling tool comprises a shank with a working portion formed with a recess for receiving a thread cutting insert. The thread cutting insert has one edge formed with a line of thread-form teeth of identical profile. The thread cutting teeth project laterally for cutting engagement with a work-piece while the tool spins about its axis. The tool also orbits within or about a work piece, and in one orbit of the tool in a helical cutting path relative to the work piece a number of complete turns of the screw-thread are formed which is equal to the number of teeth of the insert in engagement with the work-piece. A secondary cutter carried on the thread cutting milling tool provides for formation of a pilot portion or counter bore on the work piece at an end of the screw thread. The pilot portion or counter bore provides for alignment of a threaded member which is to engage the screw thread.

Abstract: A tool for rethreading a damaged threaded object having a solid body with at least one through bore including at least one cutting tooth. A slot intersects the through bore, allowing relief for shavings removed from the object as it is rethreaded. The tool can be adapted to receive a pivot arm to increase the force exerted on the object. Multiple through bores and cutting teeth of varying sizes can be formed in a single tool. The tool may also be adapted to be used in conjunction with taps of varying sizes.

Abstract: A thread milling cutter with drill blade has a drill blade 6 at the leading end of a land 5 divided by grooves 3 and a tapered tapping blade 7 provided behind the drill blade, with the upper end thereof in the direction of rotation projecting outward beyond the drill blade 6. The drill blade 6 first pre-drills a hole and then the tapered strong tapping blade 7 cuts internal threads on the inner wall of the pre-drilled hole.

Abstract: An electrical fitting tap for retapping the hollow interior edge of a junction box or the like comprising a unit having two milled taps that are opposed and concentrically aligned at a joint provided with four opposing holes within which a cheater bar can be inserted. The center of each of the taps is open so that wires within the electrical fitting box can be threaded through the tool and positioned out of the way when the retapping is accomplished.

Abstract: A hole cutting tool for holemaking, chamfering, grooving, threading and/or O-ring grooving. The tool is a rotary tool for holemaking in a workpiece which includes one or more holemaking inserts about the outermost end of the tool, at least a pair of axially spaced apart chamfering inserts radially sunken into the intermediate portion of the tool, and one or more grooving inserts also radially sunken into the intermediate portion of the tool between the chamfering inserts, all of which provides for holemaking with chamfered entrance and exit edges and/or a slot, groove, or threads within the hole. An additional O-ring grooving insert may be provided to cut an annular groove around the hole on an end face of the workpiece.

Abstract: A thread cutting tool is provided to simultaneously cut opposed concentric screw threads on a connector member. The tool comprises a cylindrical body with radially spaced first and second thread cutting sections and is adapted to cut threads in soft materials to obtain a high precision screw threaded connection.

Abstract: Method and apparatus are disclosed for forming dual synchronized threads on the interior and exterior cylindrical portions of a tube or pipe, and in the inner and outer cylindrical surfaces of an annular channel formed in an object. The method for producing dual synchronized threads includes initially defining a rotational zero point on the object where the first set of threads is to begin, cutting or forming the first set of threads, determining a rotational zero point on the object where the second set of threads is to begin, the second rotational zero point being relative to the first rotational zero point, and cutting or forming the second set of threads with the same lead as the first so that the two sets of threads will be synchronized and their starting points will be in some specified relationship to each other. An apparatus is also disclosed for cutting dual synchronized threads, the apparatus comprising a combination tap and die for simultaneously cutting dual threads on and in an object.

Abstract: A drilling and thread-milling tool for generating an internal thread in a workpiece, including a proximal shank portion attachable to a driving device for rotating the tool about a rotation axis thereof, and a distal cutting portion rotated with the shank portion about the rotation axis for generating the internal thread while the distal cutting portion is moved relative to the workpiece. The cutting portion has at least one thread-milling tooth on an outer circumferential surface thereof, each tooth having a configuration similar to that of the internal thread, and a height substantially equal to a depth of the internal thread. The cutting portion further has at least one end-cutting edge on a distal end face thereof so as to extend in a radial direction thereof, each end-cutting edge having a maximum diameter which is larger and smaller than a minor diameter and a major diameter of the thread-milling tooth.

Abstract: A unitary bore forming and threading tool for producing a variety threaded bores having chamfers and counterbores without a need for tool changes. The improved took preferably includes a shaft of predetermined axial length and having proximal and distal ends, a shank located adjacent the proximal end, a holemaking element located adjacent the distal end, and a threadmill portion located axially between the bit and the shank. The holemaking element further includes a chamfering surface and an end cutting surface. The disclosed tool and method enable creation of a variety of bores such as chamfers, counterbores, and threaded bores by producing bore portions of selectively determined distinct diameters by sequentially axially feeding the tool into the workpiece along distinct tool paths without changing tools. If desired, one or more of the bore portions can be threaded with the threadmill by moving the threadmill in a selectively determined helical or nonhelical path.

Abstract: A threaded hole may be formed in a lid of an underground petrol tank without emptying the tank or removing the lid, using a tool (FIG. 3) having a taper tap section (61), an intermediate tap section (62) and a final tap section (63). At the leading end of the tool, there is a reamer section (60) and supported on the free end of the tool is a centerless hole cutter (50). A resilient mounting transmits drive from the main part of the tool to the cutter (50), but allows the cutter to float. A sleeve (23) surrounds the tool, so that a column of inert gas may be caused to lie in the cutting region. A magnet (57) mounted within the cutter (50) catches and holds a released disk of the cover. Also described is a rig (FIG. 1), for operating the tool (FIG. 3), and a method (FIG. 5) of securing a collar threaded into a hole formed by the tool.

Abstract: A threaded hole (20) in a workpiece (22) is formed by rapidly spinning an elongated tool (24) having a drill point (64) at one end, at least one longitudinally extending flute (80) having thread milling faces (84) for milling the thread to be formed, and wherein the tool (24) is first moved axially to carry the drill point (64) against and into the workpiece (22) to form a hole (66), then is displaced radially a distance equal to the thread depth to be formed, then is moved orbitally around the hole (66) to mill threads therein, then is displaced back to the center of the hole (20) and then is retracted from the hole (20). To form a helical thread in the hole (20), the tool (24) is shifted axially one thread pitch during the orbital movement. A thread milling drill head (26) is disclosed for chucking the tool (24) and shifting it through the aforesaid movements.

Abstract: A combination tool is disclosed for drilling a hole in a workpiece on the inward feed of the tool and for threading the hole during retraction of the tool. The tool that has a straight body with a drill point at the forward end, a shank at the rearward end and a thread-form mill between the drill point and the shank.

Abstract: A tap and die wrench for threading flat and round workpieces and, formed of hardened steel or a softer material with hardened steel inserts at those points sustaining torque and tensile forces during operation, provides a body member adapted for receiving and retaining taps and a base adapted for receiving and holding round or hex dies, and the body member and base are mounted upon parallel alignment rods and held apart by a spring bias effected through springs mounted on each of the rods. A tap retained within the body member is tensioned away from the workpiece for simultaneous self-aligning during the tapping process. A die guide insertable into the centralized opening of the body member surrounds and guides the workpiece during the external threading process.

Abstract: A description is given of equipment for the production of screw-threaded drilled holes (tapped holes) of variable diameters in solid materials in a single-pass operation with the use of an integrated cutting tool and with the use of a commercially-available hand-drilling machine having an electronically-controlled motor drive, or any other type of drive, where the equipment includes a tool spindle which may be attached to the drive shaft of a hand-drilling machine or the like, and which is radially displaceable in relation to its axis and accommodated in a cylindrical housing for the spindle, where the position of said spindle housing may be adjusted axially in a specified manner by means of a screw device in a holder which may be mounted on the tool and has arrangements, on the one hand, for limitation of the axial travel of the tool and, on the other hand, for adjustment of the desire diameter of the tapped hole which is to be produced.

Abstract: A combination tool is disclosed for drilling a hole in a workpiece on the inward feed of the tool and for threading the hole during retraction of the tool. The tool comprises a straight body with a drill point at the forward end, a shank at the rearward end and a threadform mill between the drill point and the shank.