This invention, a thread chase with a lead that acts as a smooth bore guide into a threaded hole is suitable where space is confined, and the male thread chase must be exactly aligned with the female threads, “sight unseen”, or damage to female threads may result by applying force to a misaligned thread chase, particularly where the female threads are of softer metals. The lead smooth bore also prevents shavings and other debris resulting from the cleaning from the chase, from falling into the hole that is being cleaned. A recessed tapered area between the threaded portion of this case and the lead smooth bore guide collects the shavings or cleaning residue so that when the tool is withdrawn from the hole, the shavings and cleaning residual will collect in that area and not fall into the threaded hole being cleaned.

Embodiments of the invention relate to methods of making articles having portions of polycrystalline diamond bonded to a surface of a substrate and polycrystalline diamond compacts made using the same. In an embodiment, a molding technique is disclosed for forming cutting tools comprising polycrystalline diamond portions bonded to the outer surface of a substrate.

Embodiments of the invention relate to methods of making articles having portions of polycrystalline diamond bonded to a surface of a substrate and polycrystalline diamond compacts made using the same. In an embodiment, a molding technique is disclosed for forming cutting tools comprising polycrystalline diamond portions bonded to the outer surface of a substrate.

The present disclosure relates to a lightweight thread cutting tap having a body, comprising at a first end a connector portion, and, at a second end, a threaded portion for cutting a thread of an opening in which said threaded portion is to be introduced, said threaded portion terminating in a bottom end, said threaded portion having at least two cutting edges in the circumferential direction of said body, each of said cutting edges being an integral peripheral part of a flank portion extending substantially radially from the longitudinal extension of said body; and a plurality of chip removal flutes between said flanks, said flutes extending in the longitudinal direction from said bottom end, said thread cutting tap having a hollow interior, wherein the body forms a sidewall and the hollow interior extends into the threaded portion.

The present disclosure relates to a lightweight thread cutting tap having a body, comprising at a first end a connector portion, and, at a second end, a threaded portion for cutting a thread of an opening in which said threaded portion is to be introduced, said threaded portion terminating in a bottom end, said threaded portion having at least two cutting edges in the circumferential direction of said body, each of said cutting edges being an integral peripheral part of a flank portion extending substantially radially from the longitudinal extension of said body; and a plurality of chip removal flutes between said flanks, said flutes extending in the longitudinal direction from said bottom end, said thread cutting tap having a hollow interior, wherein the body forms a sidewall and the hollow interior extends into the threaded portion.

A thread-cutting tap includes: a thread portion having an external thread, and including a chamfered portion and a complete thread portion that is axially adjacent to the chamfered portion; a flute extending from an axially distal end of the tap toward an axially proximal end of the tap; a rake face defined by one of widthwise opposite end portions of the flute; and a cutting edge defined by one of widthwise opposite edges of the flute, so as to be adjacent to the rake face and extend along the flute. The cutting edge is provided with a protrusion portion at least in a radially outer end portion of the chamfered portion, such that the protrusion portion protrudes from the rake face forwardly in the rotation direction and extends along the cutting edge.

A thread-cutting tap includes: a thread portion having an external thread, and including a chamfered portion and a complete thread portion that is axially adjacent to the chamfered portion; a flute extending from an axially distal end of the tap toward an axially proximal end of the tap; a rake face defined by one of widthwise opposite end portions of the flute; and a cutting edge defined by one of widthwise opposite edges of the flute, so as to be adjacent to the rake face and extend along the flute. The cutting edge is provided with a protrusion portion at least in a radially outer end portion of the chamfered portion, such that the protrusion portion protrudes from the rake face forwardly in the rotation direction and extends along the cutting edge.

A method of manufacturing a threaded hole in a workpiece includes providing the workpiece having a region with a hole. The method also includes cutting a threading for the hole. Furthermore, the method includes, independent of cutting the threading, densifying the region proximate the hole to reduce material porosity in the region.

A hybrid threading tool defines a longitudinal axis and includes a cutting portion with a plurality of cutting teeth. The plurality of cutting teeth are configured to cut a first threading into a workpiece. The hybrid threading tool also defines a forming portion that is attached to the cutting portion and that is arranged therewith along the longitudinal axis. The forming portion includes a plurality of forming teeth configured to plastically deform the first threading into a second threading for the workpiece.

The tap tool (10) has an axis of rotation (Cr) and machines a pilot hole (6′) so that the same becomes a screw hole (6) in a state where the axis of rotation has been matched to a central axis (C6) of the pilot hole which is provided to a workpiece, wherein the tap tool (10) is characterized by being provided with: a thread section (14) having a blade section (14a) for machining a thread groove of the screw hole; pad sections (15, 16) located behind in a direction of rotation of the blade section, and engaging with the thread groove machined by the blade section during the machining of the thread groove; and a non-engagement section (17) for forming a space (20) between said section and the screw hole in a cross-sectional view where the axis of rotation and the central axis of the screw hole have been matched. The space has a size that enables simultaneous release of the engagement between the thread section and the thread groove and the engagement of the pad sections and the thread groove, in a case where the tap tool has shifted in a direction orthogonal to the axis of rotation within the screw hole, such shift being from the state where the axis of rotation and the central axis of the screw hole have been matched.