A holesaw assembly includes a holesaw and a pilot bit. The holesaw includes a hollow cup defining a center axis. The cup has a round base perpendicular to the center axis and a peripheral wall coupled to and extending axially forward of the base to a peripheral edge at a free end of the wall. The pilot bit is received in the holesaw along the center axis. The pilot bit has a shaft received in the base, a cutting head coupled to a front end of the shaft, and an at least partially threaded tip coupled to a front end of the cutting head. The holesaw is free of any radial cutting elements disposed inside the cup between the drill bit and the peripheral wall of the cup.

Provided is a drill having a flat-shaped drill tip and excellent in cutting edge strength and chip removability. The drill includes: a cutting edge extending in a direction at an angle of not less than 85 and not more than 90 with respect to a drill axis (line O-O); a flank face contiguous to the cutting edge and having a clearance angle of not less than 5 and not more than 10 with respect to the drill axis (line O-O); and a rake face located opposite to the flank face across the cutting edge, the cutting edge includes a recess receding in a direction parallel to the drill axis (line O-O), and the rake face includes a front clearance formed at a side of an outer periphery of the drill.

A drill according to an embodiment of the present invention has a pair of main cutting edges positioned at a front end of a drill body, a pair of first chisel edges each extending from the pair of main cutting edges toward a rotation axis, and a second chisel edge positioned between the pair of first chisel edges and intersecting with the rotation axis of the drill body. When viewing a locus of rotation of the pair of first chisel edges and a locus of rotation of the second chisel edge in a cross section taken so as to include the rotation axis, the respective locus of rotation of the pair of first chisel edges have a rectilinear shape, and respective imaginary straight lines obtained by extending the locus of rotation of the pair of first chisel edges toward the rotation axis are positioned further to a rear end side of the drill body than the locus of rotation of the second chisel edge.

A hole saw component combinable with a saw blade detachably comprises an arbor assembly and a holder. The arbor assembly comprises a collar, a shank part, a movable member and at least one drive pin. The shank part is connected with the collar and comprises a plurality of positioning grooves. The movable member is sleeved on the shank part and is movable between different positioning grooves relative to the shank part. The drive pin is connected with and moved with the movable member. The holder forms a detachable engagement structure with the collar. When the movable member moves to different positioning grooves relative to the shank part, a combination status of the holder and/or the saw blade is changeable by moving the drive pin with the movable member, such that the arbor assembly or/and the saw blade is separable from or combinable with the holder.

A drill structure comprises a shank part and a flute part disposed on one end of the shank part. The front region of the flute part has a web. Two sides of the web are tilted backward to form a first cutting face and a second cutting face. At least one flute is formed on the outer surface of the flute part. The flute part has a bit core in the center thereof. The radius of the cross section of the bit core is defined as the web thickness. The first cutting face includes a first primary cutting face and a first secondary cutting face. The second cutting face includes a second primary cutting face and a second secondary cutting face. The first cutting edge of the first primary cutting face is not parallel with the first connection edge. The width of the primary cutting face width is larger than the web thickness. The drill structure has high cutting ability and long service life.

A drill of the present invention includes: a drill main body; a plurality of convex-arc cutting edges which are formed on a tip side of the drill main body from an outer periphery of the drill main body to a chisel edge provided near to a rotational axis; second faces which are each formed in an approximately band shape and are each formed along each of the convex-arc cutting edges on a back side of the convex-arc cutting edge in the rotational direction; third faces which are each formed to be continuous with a back side of each of the second faces in the rotational direction; and fourth faces which are each formed to be continuous with a back side of each of the third faces in the rotational direction.

A drill includes a bar-shaped drill body, a major cutting edge which is located at a front end of the drill body and has a straight-line region in a front view, a rake surface located along the major cutting edge, and a chip discharge flute being extended spirally around a rotation axis of the drill body in a direction from the rake surface toward a rear end of the drill body. The rake surface has a flat region located along the straight-line region.

Orthopedic systems and methods for installing an implant and/or boring a bone bicortically. The system may include a drill having a proximal boring portion configured to bore a larger hole in a bone more efficiently when the drill rotates in a first direction compared to an opposite second direction, and a distal boring portion configured to bore a smaller hole in the bone more efficiently when the drill rotates in the second direction. The implant may be configured to be implanted at least partially in the bone, such that a first region of the implant is located in the larger hole and a second region of the implant is located in the smaller hole. In an exemplary method, the larger hole and the smaller hole may be bored in the bone's near cortex and far cortex, respectively, by a shaft and a nose of the drill rotated in opposite directions.

A saw blade can include a blade body having a cutting edge defined by multiple teeth. The teeth can be disposed in a repeating pattern including a raker tooth, a first set tooth having a light offset to a right side of the blade body, a second set tooth having a heavy offset to the left side of the blade body, a second raker tooth, a third set tooth having a light offset to the left side, and a fourth set tooth having a heavy offset to the right side of the blade body. Each tooth can include a tip, rake face, gullet having a gullet depth, and one or more clearance surfaces. The pitch distance and gullet depth of the heavy offset teeth can be less than the pitch distances and gullet depths of the remaining teeth to provide an increased amount of strength for the heavy offset teeth.

A drill bit including a body and a cutting head. The body includes a shank, an end surface, and a body flute. The shank is at a first end of the body. The end surface at the second end of the body opposite the shank. The body flute extends from the second end of the body toward the first end. The body is configured to rotate about an axis extending through the shank and the end surface. The cutting head is attached to the end surface of the body. The cutting head is configured to drill a hole in the workpiece. A ratio of a cross-sectional area of the hole, measured perpendicular to the axis, to a cross-sectional area of the body at the end surface, measured perpendicular to the axis, is greater than 2.