A deburring tool that includes a deburring arm which is held in a flexible relationship with respect to an arbor of the deburring tool. In some implementations, the deburring tool is capable of drilling a hole, deburring the hole with the deburring arm, and machining one or more features in the hole, such as an end chamfer. A plurality of attachment elements are located in the arbor to engage the deburring arm. The deburring tool may also include a second deburring arm that is particularly oriented with respect to one or more cutting elements used for drilling the hole.

In an aspect of the disclosure, a cutting tool includes a base member and a coating layer located on a surface of the base member. The coating layer includes a lower layer, an upper layer, and an intermediate layer located between the lower layer and the upper layer. The intermediate layer includes a first layer, a second layer, and a third layer. The first layer contains TiC.sub.x1N.sub.y1O.sub.z1 (0x1<1, 0y1<1, 0<z1<1, and x1+1+z1=1). The second layer contains TiC.sub.x2N.sub.y2O.sub.z2 (0x2<1, 0y2<1, 0<z2<1, and x2+y2+z2=1). The third layer is located between the first layer and the second layer, and contains TiC.sub.x3N.sub.y3O.sub.z3 (0x3<1, 0y3<1, 0z3<1, and x3+y3+z3=1). Here, z1>z3 and z2>z3.

An insert includes four identical cutting edges disposed at the intersection of top and side surfaces surface. Each cutting edge includes a first part edge disposed tangent to a first reference circle aligned about the central mounting aperture; a second part edge extending from the first part edge, the second part edge being connected to the first part edge via a convex curved portion; a third part edge disposed tangent to a second reference circle aligned about the central mounting aperture, the second reference circle having a smaller diameter than the first reference circle, the third part edge being connected to the second part edge via a concave curved portion; and a convexly curved corner portion extending from the third part edge of one of the identical cutting edges to the first part edge of another one of the identical cutting edges.

A cutting insert in the present disclosure includes an upper surface, a lower surface, a side surface, and an edge. The upper surface includes a first corner part and a second corner part. The edge is located in a region which is located between the first corner part and the second corner part. The edge includes a first edge located at a side of the first corner part, a second edge located at a side of the second corner part, and a third edge located between the first edge and the second edge. The edge has a curvilinear shape being recessed toward the lower surface in a side view. Each of a radius of curvature R1 of the first edge and a radius of curvature R2 of the second edge is smaller than a radius of curvature R3 of the third edge in a side view.

An object is to prolong the life of a cubic boron nitride cutting tool used for cutting a heat-resistant alloy. A cubic boron nitride cutting tool includes an edge tip made of a sintered cubic boron nitride compact including cubic boron nitride particles; and a base metal that holds the edge tip at a corner portion of the base metal, wherein a cutting edge formed on the edge tip of the tool has a positive rake angle.

In the case of a tool holder having a receptacle for a cutting insert, in particular a tangential cutting insert having eight lips, having a lateral bearing surface, a rear bearing surface and a bottom surface, the bottom surface is quadrangular in plan view and has a raised supporting region which has two supporting surfaces, positioned obliquely with respect to one another, for the cutting insert.

A tube deburring apparatus is disclosed and configured for deburring and beveling a terminal end of a tube. In at least one embodiment, the apparatus provides a deburring mechanism configured for use with a torque mechanism. The deburring mechanism provides a plurality of spaced apart bearings radially arranged about a center axis of rotation of a deburring body of the deburring mechanism and defining an imaginary receiving boundary sized for coaxially receiving the terminal end of the tube therewithin. The deburring body further provides a deburring bit positioned radially inwardly from the bearings, a deburring end of the deburring bit providing a cutting edge configured for selectively contacting the terminal end of the tube when the terminal end of the tube is coaxially positioned within the receiving boundary between the bearings.

An object is to prolong the life of a cubic boron nitride cutting tool used for cutting a heat-resistant alloy. A cubic boron nitride cutting tool includes an edge tip made of a sintered cubic boron nitride compact having a thermal conductivity within the range of 20 to 70 W/m.Math.K and including cubic boron nitride particles having an average particle diameter within the range of 0.5 m to 2 m; and a base metal that holds the edge tip at a corner portion of the base metal, wherein a cutting edge formed on the edge tip of the tool has a positive rake angle.

The present disclosure relates to a quadrangular indexable drill insert. The drill insert includes a substantially flat top surface, a bottom surface and a side surface adjoining the top and bottom surfaces. The side surface comprises four identical cutting edges intersecting the top surface; each cutting edge comprises a first part edge oriented inwardly towards axis of the drill body. A second part edge tangential to an imaginary inscribed circle diameter connected to the first part edge through a convex curve. A third part connected to the second part edge through concave curve and a fourth part edge connected to the third part edge though a convex curve. The insert further includes a curved nose portion at four corners, each adjoining a first part edge of one cutting edge with a fourth part edge of a succeeding cutting edge.

A cutting member comprising a cutting edge (S.sub.1,S.sub.2,S.sub.i) defining a cutting envelope and configured for removing material from a workpiece leaving therein a corner of angle . The cutting edge comprises a first cutting segment (S.sub.1) and a second cutting segment (S.sub.2) spaced from the first cutting segment (S.sub.2). Respective first and second imaginary tangents (T.sub.1,T.sub.2) of the first and second cutting segments (S.sub.1,S.sub.2) intersect one another at point O located outside the cutting envelope, forming an angle corresponding to angle , thereby defining a cutting frame at least a portion of which extends beyond the cutting envelope. The cutting edge further comprises an adjoining cutting segment (S.sub.i), extending between and bridging the first cutting segment (S.sub.1) and the second cutting segment (S.sub.2), and at least partially contained within the cutting frame. The cutting member further comprises at least one auxiliary cutting element (AT.sub.1,AT.sub.2) comprising an auxiliary cutting edge (CE,CE) extending generally along one of the imaginary tangents (T.sub.1,T.sub.2) and beyond the cutting envelope. The auxiliary cutting edge (CE,CE) does not intersect the other of the imaginary tangents (CE,CE) and/or a bisector (B) of the angle .