Abstract: A thread forming tap including a complete thread portion and a leading portion that are provided with an external thread. A thread ridge of the external thread has, in an axial cross section, a triangular shape that is defined by a pair of flanks located on respective opposite sides in an axial direction, such that each of the flanks is inclined by a predetermined flank angle corresponding to a shape of a valley of an internal thread to be formed. A sharp crest is provided in a top portion of the thread ridge at least in the leading portion, and has, in the axial cross section, a triangular shape that is defined by a pair of side surfaces located on respective opposite sides in the axial direction, such that each of the side surfaces is inclined by an inclination angle that is larger than the flank angle.

Abstract: A hybrid threading tap includes a reamer portion and a thread cutting portion having a plurality of cutting teeth. The thread cutting portion is arranged with the reamer portion along the longitudinal axis. The reamer portion is configured to be advanced within a hole of a workpiece to plastically deform and expand the hole to an expanded hole and provide the expanded hole with a zone of residual compressive stress. The plurality of cutting teeth is configured to cut a threading into the expanded hole within the zone.

Abstract: A pipe-tapered-thread machining tap has a thread, four spiral flutes and four cutting edges that include a plurality of thread intersection portions at each of which a corresponding one of the four cutting edges intersects with the thread. The thread intersection portions of the cutting edges have four groups, such that each of the four groups has ones of the thread intersection portions that are portions of a corresponding one of the four cutting edges. Every two of the thread intersection portions of each of the four groups is removed, such that, in each of the four groups, at least one of the thread intersection portions that is removed and at least another one of the thread intersection portions that is not removed are alternately arranged in a direction in which a corresponding one of the four cutting edges extends.

Abstract: A bionic fixing apparatus is provided. The bionic fixing apparatus includes a body having a through hole and at least one slit. The through hole penetrates the body from the top surface to the bottom surface to form a top opening and a bottom opening. An inner diameter of the top opening is larger than an inner diameter of the bottom opening. The slit is connected to the bottom opening and extends upwardly from the bottom surface of the body, such that the body has a flexible bottom portion.

Abstract: In one aspect, thread forming taps are described herein. In some embodiments a thread forming tap comprises a shank disposed at a first end adapted to engage a tool holder and an elongated working portion disposed at a second end. The working portion comprises at least one helical thread and a plurality of longitudinally-extending linear grooves. The longitudinally-extending linear grooves intersect the helical thread forming a plurality of lobes, wherein adjacent lobes differ from one another in relief type and/or relief rate.

Abstract: The radial run-out tool (2), particularly a drill or a cutter, has a basic body (12) extending in an axial direction (4) and comprises at least two chip grooves (14), to which a guide chamfer (22) is connected in the rotational direction (24), with a ridge (15) being formed between them. A radial clearance is connected to the guide chamfer (22). In order to enable simple and economical production of such type of radial run-out tool (2), an unprocessed rod (30) is ground non-concentrically, in a first process step, such that a radius (R) of the unprocessed rod (30) varies, depending on the angle, between a maximum radius (R2) and a minimum radius (R1). In a second process step, the chip grooves (14) are grounded down such that the guide chamfers (22) are formed at the positions with the maximum radius (R2) and the radius (R) is subsequently reduced downstream of the respective guide chamfer (22) in order to form the radial clearance (28).

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: A cutting tap includes a body having an axial forward end and an axial rearward end and a central longitudinal axis. The body has a fluted section at the axial forward end. The fluted section includes a chamfered fluted section extending from the axial forward end of the body and terminating at a first full cutting thread. The chamfered fluted section includes a first cutting thread located a first distance from the axial forward end of the body, and a second cutting thread located a second distance from the axial forward end of the body. The second distance is greater than the first distance. The chamfered fluted section is shaped such that a thickness of a section of material removed by the second cutting thread is smaller than a thickness of a section of material removed by the first cutting thread. A method of making the cutting tap is also disclosed.

Abstract: An extrication tool for enlarging openings or separating, spreading, or breaking apart materials, fastened to different structural geometry. The extrication tool generally includes a threaded conical shape with a wide aggressive thread with separate portions of the conical surface having different thread pitches, increasing from its tip end to its large distal end. In one form, an optional radial flange at the drive end restricts the device from penetrating into the materials acted upon.

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 or the like

Abstract: The die has a bore that is generally sized to fit onto a like-sized stud. Threads are formed on the interior of the bore for cutting the threads on the stud. The die includes an integrated alignment mechanism to ensure that the die is aligned with respect to the stud as the die is rotated onto the stud.

Abstract: A cutting tap that has an elongate tap body with a fluted section at the axial forward end thereof wherein the fluted section includes a chamfered fluted section and a finishing fluted section. Each cutting thread in the chamfered fluted section has a cutting face disposed at a cutting face angle that becomes more negative the more axially rearward the cutting thread is from the axial forward end of the chamfered fluted section. Each cutting thread in the finishing fluted section has a cutting face disposed at a finishing cutting face angle that is essentially equal. The finishing cutting face angle is more negative than the cutting face angle for the cutting thread at the axial rearward termination of the chamfered fluted section.

Abstract: It is an object of the invention to provide a thread-forming tap to which a chamfer can easily be mounted, and a general threading method. The thread forming tap of the invention has a threaded portion comprising a tapered chamfer and a parallel threaded portion which is formed continuously with the chamfer. A depth of root of the chamfer is set equal to that of a root of the parallel threaded portion constantly.

Abstract: A lordotic implant has a frusto-conical shape with external threads. Prior to placement of the implant, vertebrae are distracted in a manner to provide a desired lordosis between the vertebrae. The pre-distracted vertebrae are then tapped to provide a tapped bore having a geometry matching the conical geometry of the implant. The threaded implant is then placed within the pre-tapped conical bore.

Abstract: A tap having a reamer edge which is provided at a chamfer part, so that when the thread forming tap is pulled out after the internal thread is formed, a seam portion present at the crest of the internal thread is cut off, whereby even in a blind hole, formation of internal thread and cutting of the seam portion are performed in a single process, and formation of an internal thread and processing of an inside diameter portion are achieved in a single process to obtain concentricity in line with each other. Further, even if there is a deviation in diameter of the hole before threading, the inside of the internal thread is processed to a constant value.

Abstract: A thread tapping cutting tool includes a working part with a chamfer portion, control portion, and at least two thread cutting wings (separated by flutes) formed therein. The chamfer portion is at least one half of the length of the working part. Each of the two or more thread cutting wings has a width of not more than 0.2 times a tap drill outer diameter of the working part, and not less than 0.02 times the tap drill outer diameter. The chamfer portion has plane surface lands on the cutting wings at the outer edge, and a relief angle of the plane surface lands is greater than 5 degrees. The core diameter of the cutting wings is defined by the depth of the flutes, and is not more than 0.35 times the tap drill outer diameter.

Abstract: The invention comprises means to align and stabilize taps prior to the commencement of the actual cutting of the threads and to release air while tapping. On the tap a constant diameter stabilizer is placed before the tapered chamfer section of the tap. This front portion is of a diameter slightly less than the inner diameter of the hole to be tapped. The front portion is inserted into the hole and acts to align the tap and avoid cross-threading of the tapped hole. To release air trapped in a blind hole, the flutes of the tap are extended through the stabilizer portion.

Abstract: An improved tap has a thread cutting portion over which there is a Titanium nitride coating. The Titanium nitride coating has a Rockwell C hardness of at least 70. The body portion of the tap underlying the Titanium nitride coating has a Rockwell C surface hardness of at least 65. This enables the body portion of the tap to provide a rigid support for the Titanium nitride coating. Due to the interaction between the Titanium nitride coating, the relatively hard body portion of the tap, the number of flutes and the cutting face hook angle, the number of holes which can be tapped with a straight fluted tap is increased from 114 to 1,461. On a spiral pointed type tap having a relatively hard body portion interacting with the Titanium nitride, number of flutes and cutting face hook angle, the number of holes increases from 1,662 to 4,758.

Abstract: A thread forming tool comprising a metal cylinder having a thread tap mounted in an open-sided chamber in the cylinder so that the longitudinal axis of one set of teeth on the tap is parallel with the longitudinal center axis of the cylinder and positioned so the teeth project radially outward from the cylindrical surface of the cylinder. A lock structure secures the tap against rotation relative to the cylinder, and driving structure on the cylinder is operable to rotate it around its longitudinal center axis as the tap teeth form threads on a bore through which the cylinder is driven. Different size threads can be cut with a given tap by sequentially positioning the tap at different angles of rotation relative to a center line through the centers of the tap and the cylinder.

Abstract: A tapping tool for making a vibration-resistant prevailing torque fastener combination comprising a conventional first element having a standard thread form with first flank angles and a modified second element having a thread form characterized by second steeper flank angles over the entire length thereof, and a truncated root caused by foreshortening of the flanks over a portion of the thread length to produce a helical flat which firmly engages and typically deforms the crest of the first element when threadedly engaged therewith. A difference in flank angles provides longitudinal clearance to receive the deformed material during the threaded engagement.

Abstract: Disclosed is a method and apparatus for machining a tubular workpiece to form an internally threaded coupling having a faced and chamfered end and a tapered counterbore. The method includes forming a tool support bar having a longitudinal axis and supporting on the tool support bar first and second tools having cutting edges and a thread cutting tool. The method further includes rotating the workpiece about its longitudinal axis and positioning the tool support bar relative to the workpiece such that the axis of the tool support bar and the workpiece lie in one plane and are substantially parallel to each other. The method further includes moving the support bar to chamfer and face the end of the workpiece with the first tool, moving the tool support bar to taper and counterbore the interior of the workpiece with the second tool, and moving the support bar to thread the tapered interior of the workpiece with the thread cutting tool.

Abstract: A tap for cutting threads in a hole which comprises a semi-circular tap body with threads cut in the circular surface extending to a diametrical surface. Modified embodiments include a rake angle at the cutting ends of the tap threads and a drill point to allow the device to serve as a drill and tap.

Abstract: A countersinking tool comprising a holder with at least two removable cutting inserts for countersinking relatively large holes. The holder has a locating recess and a seating surface for each insert, and is cut away at various parts to facilitate the countersinking operation. The inserts may be cut away at one part to facilitate the mounting of a plurality of inserts on the holder.

Abstract: A tapping tool for making a vibration-resistant prevailing torque fastener combination comprising a conventional first element having a standard thread form with first flank angles and a modified second element having a thread form characterized by second steeper flank angles over the entire length thereof, and a truncated root caused by foreshortening of the flanks over a portion of the thread length to produce a helical flat which firmly engages and typically deforms the crest of the first element when threadedly engaged therewith. A difference in flank angles provides longitudinal clearance to receive the deformed material during the threaded engagement.

Abstract: A male screw thread-formed member such as an insert having a thread cutting action has an exterior peripheral portion of substantially full V-thread form along which two or more angularly spaced apart flutes extend from one or both ends of the member, the member being provided with at least one non-helical rib initially of generally annular peripheral V-form at one or both ends thereof and on which is formed a varying reduced V-thread form which follows a helix corresponding to that of the full thread form whereby pointed cutting formations providing peaks of different radial heights and with some of them of offset disposition relative to the helix are formed on the or each rib at the flutes for effecting a distributed thread cutting action thereat, e.g., for use in thermo-setting plastic material.

Abstract: A rotary tool having a working part and a shank. The working part is formed by at least two axial portions of which the first portion is made with the profile of a twist drill for making a pilot hole, and the second portion is disposed axially between the first portion and the shank. The second portion is made in such a manner as to enlarge the pilot hole upon entering it and to ensure self-feed of the tool in the axial direction. This permits substantial reduction of required force for axial feed of the tool, improves productivity and allows making holes of different diameter with one and the same tool.

Abstract: A rotary cutting tool having a cutting element at one end and a cylindrical shank at the other end terminating in a T-shaped mounting tongue member, and a tool support for holding the tool in floating engagement the support having a cylindrical body with a transverse T-slot in its end for receiving said tongue member, the slot having sliding clearances with respect to the tongue member, and the holder having a sleeve which is spring urged to cover the T-slot to retain the tongue member in it, the inner diameter of the bore through the sleeve having a small clearance where it overlies the shank of the tool so that the latter can move transversely to align the tool in a hole when it is in use.

Abstract: A threading tap, having the usual longitudinally extending flutes to provide lands therebetween. Each land is provided with screw-cutting teeth, and each land has at least one cross-groove formed therein of a length equal to at least two teeth and of a depth greater than the root depth of adjoining teeth. A cross-groove in one land is longitudinally off-set from a cross-groove in an adjoining land to provide for chip clearance and yet not materially weaken the structure of the tap.