Abstract: A hole saw arbor with mechanically automated plug removal to automatically remove the center plug of debris following drilling with the hole saw. A slidable collar is placed in an upper position on a threaded shaft to drill with the hole saw, and slid to a lower position on the threaded shaft for automated function of an ejection plate to rise within the hole saw to slowly eject a plug of removed material.

Abstract: Provided is a core drill having one touch lock function of a core bit, and particularly, new-conceptional technology of maintaining locking automatically during assembling a core bit and a decelerating unit, and releasing the locking easily, and the core drill conventionally disclosed had problems that movement and separation of the core bit and the decelerating unit of the core drill often occur during operation, because there is no specific lock function in the state that the core bit and the decelerating unit are assembled, and in this disclosure of the present invention to solve the problems, there is provided new technology for automatically maintaining locking if releasing the locking after inserting a decelerating connector coupled to a core bit into a connection hole formed in a spindle in the state of releasing the locking by pressing the lock pin elastically installed in a lock housing fittingly installed outside the spindle.

Abstract: A hole cutter has a substantially cylindrical blade body defining a blade body circumference, a cutting edge formed on one end of the blade body, and an axially-elongated slot formed through the substantially cylindrical blade body. The axially-elongated slot is configured to receive chips flowing from the cutting edge within the interior of the blade body and (i) into the slot and/or (ii) through the slot, to prevent the collection of such chips within the interior of the blade body and/or at an interface between the blade body and the work piece. The axially-elongated slot defines a first end adjacent to the cutting edge, a second end axially spaced further from the cutting edge, and a slot area. The hole cutter further defines a total slot area to blade body circumference ratio within the range of about 0.1 to about 0.3 depending on the size of the hole cutter.

Abstract: A hole-saw, including a sidewall and an endcap, is provided. The endcap includes projections that fit within notches of the sidewall to form a brazed or welded joint that couples the endcap to the cylindrical sidewall. The projections extend through the notches and are brazed or welded to the base of the sidewall. The endcap couples to the sidewall to form a cylindrical hole saw body. The endcap rotates and supports the hole-saw during operation.

Abstract: An annular cutting tool and related methods are provided for herein that exhibit improved durability, cutting performance, and/or reduced heat generation for bone graft resections. The annular cutting tool can include an annular body having cutting teeth with a flat, flared distal tip for greater durability. An extended gullet can be disposed between groups of adjacent cutting teeth to improve removal of bone debris away from the cutting teeth more and thus prevent binding during use. The annular cutting body can have a recessed surface portion to reduce the area of direct contact to bone and thus reduce heat generated. The recessed surface portion can also provide an area in which bone debris can accumulate away from the cutting teeth to prevent or reduce binding of the tool during use. The annular cutting body can also include a drill bit for drilling a hole in a resected bone graft.

Abstract: The invention generally relates to intraluminal procedures, and, more particularly, to a contra-rotating cutting assembly for use with an atherectomy device to remove occlusive material from an occluded lumen, such as a blood vessel or other body lumen. The contra-rotating cutting assembly includes a rotatable housing having a distal end, an opposing proximal end and a lumen extending between the distal and proximal ends. The housing is configured to rotate about a longitudinal axis in a first direction. The cutting assembly further includes a rotatable cutter head positioned within at least a portion of the lumen of the housing and in coaxial alignment with the housing. The cutter head is configured to rotate about the longitudinal axis in a second direction opposite the first direction.

Abstract: A hole saw with a substantially cylindrical body, a center axis of rotation, an inner surface, and an outer surface. A cutting edge defined by a plurality of ground set teeth arranged in a pattern includes a first group of teeth oriented at angles toward the center axis of rotation intermixed with a second group of teeth oriented at an angle away from the center axis of rotation. The teeth angled away from the center axis of rotation are oriented at substantially the same angle and the teeth angled toward the center axis of rotation are oriented with each progressive tooth of the first group have an increasing angle relative to a prior tooth of the first group.

Abstract: A hole saw includes a substantially cylindrical body defining a cutting end and an axis of rotation. The hole saw also includes first and second apertures formed through the body and spaced from the cutting end such that a portion of the body extends between the cutting end and both the first and second apertures. The first and second apertures are both configured to receive a tool for removing work piece plugs from within the cylindrical body. The first aperture is axially spaced from the cutting end a first distance. The second aperture is axially spaced from the cutting end a second distance that is greater than the first distance. The first aperture and the second aperture are separated by a portion of the body.

Abstract: A general purpose hole saw guide and a method of forming holes through surfaces, without the need of a centering bit, are provided. The hole saw guide includes a circular disk with concentric grooves on its surface. The disk is transparent and portable for placement on a surface through which a hole is to be drilled to facilitate the centering and stabilizing control of a hole saw on the surface. The method includes the steps of providing a transparent disk having concentric grooves; positioning the disk on a surface; mounting the disk to the surface; inserting a hole saw that is fitted to a drill into the grooves of the disk; drilling a hole through the disk and surface beneath it; and removing the disk from the surface after the hole has been drilled.

Abstract: A hole saw blade comprises a substantially cylindrical body with a pair of sides extending substantially concentric to each other. The sides have an inner surface and an outer surface. A cutting edge extends from an end of the body. A plurality of teeth defines the cutting edge. The teeth are arranged in an alternating pattern in which a first tooth extends inwardly of a cylinder containing the inner surface a first inner distance. A second tooth is adjacent to the first tooth extends outwardly of a cylinder containing the outer surface a second outer distance. A third tooth is located adjacent the second tooth on an opposite side of the first tooth and that extends inwardly of the cylinder containing the inner surface a third inner distance greater than the first inner distance.

Abstract: The invention generally relates to intraluminal procedures, and, more particularly, to a contra-rotating cutting assembly for use with an atherectomy device to remove occlusive material from an occluded lumen, such as a blood vessel or other body lumen. The contra-rotating cutting assembly includes a rotatable housing having a distal end, an opposing proximal end and a lumen extending between the distal and proximal ends. The housing is configured to rotate about a longitudinal axis in a first direction. The cutting assembly further includes a rotatable cutter head positioned within at least a portion of the lumen of the housing and in coaxial alignment with the housing. The cutter head is configured to rotate about the longitudinal axis in a second direction opposite the first direction.

Abstract: The invention relates to a core drill with an end portion (3) and a drill bit portion (1-2). The end portion and the drill bit portion are joinable in a watertight fashion with a sealing element (11). The sealing element (11) is provided in a space between the end portion and the drill bit portion, such that it is being compressed in a sealing fashion when the end portion and the drill bit portion are joined. The end portion and the drill bit portion are locked together with a joining element (8, 10) which achieves this locking effect when moves in the radial direction of the core drill. When the joining element moves in this direction, the end portion and the drill bit portion move towards each other. Thus the sealing element is being compressed while concurrently the end portion and the drill bit portion are joined together. This is further achieved without the joining element having to extend in the axial direction of the core drill. Typically, the joining element (8, 10) is constituted by a set screw.

Abstract: A surgical tool, enabling extraction of a prosthesis from a bony implantation site of that prosthesis, defines a proximo-distal axis and includes a distal end head adapted both to cut at least partially the bonding interface between the prosthesis and the bony material of the implantation site and to fix itself to the prosthesis by rotation centered on the proximo-distal axis, according to embodiments of the present invention.

Abstract: A method to repair a damaged area of a workpiece with a repair kit includes rotating an arbor to drive a cutting member about a central axis of the arbor, cutting a hole in the workpiece with the cutting member, engaging the workpiece with the cutting member as the hole is cut to secure the cutting member within the hole, disconnecting the arbor from the cutting member, and leaving the cutting member in the workpiece to plug the hole.

Abstract: An example method for optimized rotation of a drill string coupled to a drill bit and disposed within a borehole may comprise determining an angular velocity of at least part of the drill string. An angular velocity threshold to avoid static friction may also be determined. Additionally, a minimum input torque to apply to the drill string to maintain the angular velocity at or above the angular velocity threshold may be determined. The method may further include generating a control signal to a top drive motor based, at least in part, on the minimum input torque.

Abstract: A drilling apparatus comprising: at least one bit; a vacuum shroud, including a compressible boot, disposed around a longitudinal axis of the apparatus and configured to be in operative communication with a vacuum attachment port; and at least one magnetic element disposed near a distal end of the apparatus and configured to attract metallic debris resulting from drilling apparatus operation.

Abstract: A hole saw having a blade portion separable into two parts which when separated form a base portion and a tip portion. The base and the tip have correspondingly shaped apertures and lugs that co-operate together to hold the blade tip in place. A locking means further assists in ensuring that the blade tip remains locked to the base and includes a sliding latch that engages an aperture in the blade and the base and is itself locked in place to thereby lock the blade to the base. An intermediate portion also allows for the hole saw to drill through different depths.

Abstract: A hole saw includes a circular saw blade and a cover plate. The circular saw blade is made by rounding a lengthwise rectangular metal sheet and connecting two ends thereof to define therein an accommodating space. The circular saw blade has one edge provided with a plurality of sawteeth and an opposite edge provided with a connecting portion. The cover plate covers the connecting portion of the circular saw blade and has a base, a positioning portion and a shoulder. The positioning portion extends from the base toward the connecting portion. The shoulder is formed between the base and the positioning portion. Thereby, the hole saw has advantages about low manufacturing costs and short production cycle. Besides, since the shoulder increases contacting area between the circular saw blade and the cover plate, the structural firmness of the soldered hole saw is improved.

Abstract: A hole cutter having an extruded plate cap and methods and apparatuses for making such caps and hole cutters. The plate cap has planar opposing external and internal surfaces with an extruded hub extending axially inwardly from the internal surface. An aperture extends axially through the hub from the external surface. At least a portion of the aperture can be threaded for threaded engagement with a driving arbor. The hub is long enough so that the threaded portion contains at least two full threads. A blade body with a cutting edge is attached to the cap to form a hole cutter.

Abstract: A hole-saw assembly including a hole-saw having at one end a plurality of cutting teeth and at the other end a base having two holes therethrough. two shafts. The assembly includes a mandrel coaxially aligned with said hole-saw and including a body having two bores therethrough, and an annulus located on top of the body which is coaxially aligned with said mandrel and hole saw. The annulus includes two shafts co-axial with the mandrel bores, and is rotatable around its longitudinal axis from a first to a second position. In the first position the annulus shafts are aligned with the base holes allowing the shafts to be freely insertable and removable and in the second position the shafts are misaligned to lock the shafts to the base. In one embodiment the mandrel bores are shaped to accommodate rotation of the shafts, and in a further embodiment, the shafts are configures to rotate within circular mandrel bores.

Abstract: The invention relates to a single-lip drill (10) having at least one cutting edge (160) for solid drilling, comprising a drill head (13) arranged on a shaft (12), a chip removal channel (151) extending substantially along the axis of the drill head (13) and of the shaft (12) and arranged in both the drill head (13) and the shaft (12), and a plurality of guiding elements (170, 171, 172, 173) arranged on the circumference of the drill head (13), wherein the single-lip drill is characterized in that at least one guiding element (170) is arranged at least partially in an angle range of greater than or equal to 245°, measured from the cutting edge (160) arranged at 0° in a direction opposite the rotational direction of the single-lip drill.

Abstract: A core drilling machine having an axial extending hollow drill shaft supported rotatably in a housing and rotated by means of a drive unit; a coaxial tool holder receiving an axially displaceable drill bit, the tool holder having a locking mechanism securing the drill bit in a rotationally fixed manner to the hollow drill shaft; wherein the hollow drill shaft is suitable for receiving a shaft of an interchangeable centre drill, the center drill axially supported against a first spring element; and an axial stop element preventing in a first position a complete displacement of the center drill into the interior of the hollow drill shaft and allows in a second position a complete displacement of the center drill into the interior of the hollow drill shaft; and an activation device for activating the first or second positions of the stop element.

Abstract: A hole includes a blade cylinder and at least one first blade portion and at least one second blade portion, which are arranged along the rotation direction at intervals. Each of the first and second blade portions includes an inside blade and an outside blade. In the first and second blade portions that are adjacent to each other along the rotation direction, the sum of the number of cutting edges of the outside blade and the cutting edge of the inside blade of the first blade is three or more, the sum of cutting edges of the outside blade and the cutting edge of the inside blade of the second blade is two or more, the number of the cutting edge of the first blade being different from the number of the cutting edges of the second blade.

Abstract: A core cutter includes a tubular body portion and a plurality of cutting blades arranged at a tip end of the body portion at predetermined intervals in a circumferential direction. At least one cutting blade serves as an inner cutting blade, and the remaining cutting blades serve as outer cutting blades. Through grooves penetrate a tip end of the body portion to open toward a tip end side of the core cutter. Each of the cutting blades having the same circumferential-direction size as the through groove. Gullets are configured to discharge the chips, each of the gullets formed by an outer peripheral surface. The cutting blades are welded to through grooves such that a radially inner end of an axial-direction tip end portion of each of the cutting blades coincides with or substantially coincides with a peripheral surface of an axial-direction tip end portion of the gullet.

Abstract: The invention relates to a drilling tool having a large drill, in particular a core drill, in which a center drill is guided in an axially flexible or movable manner, with the axial movement of said center drill relative to said large drill being limited by at least one limit stop, wherein at least one pin that is supported on the large drill, the shaft thereof or a transition therebetween, extends toward the center drill, and the pin (24) is formed at an attachment body (26) comprising a contact surface (46) that abuts on a counter contact surface (52) of the drilling tool (10) and in particular has at least partially a larger lateral extension than the pin.

Abstract: A piling planing tool utilizes a cylindrical cutter head connected to a cylindrical cutter ring having teeth for planing the outer surfaces of damaged or deteriorating in situ pilings. Spacer rings are attached between the cutter head and cutter ring to lengthen the planing tool, in order to extend the tool to plane lower outer surfaces of the pilings. A drill bit extends through the planing tool to bore center channels into the pilings. A circular cutting blade is provided beneath the cutter head to plane the top of the piling. The method of reforming in situ pilings utilizes the planing tool to shape pilings so that they can be connected with new pilings. The pilings are connected by an internal steel rebar and sleeve, permanently secured with bonding material to form a single reformed piling having high tensile strength.

Abstract: A rotary tool accessory in one embodiment includes a base, a circular wall extending upwardly from the base about a central axis, the circular wall including an inner face, an outer face and a circular rim, a first cutting group including a first inwardly extending tooth extending from a location directly above the circular wall to a location closer to the central axis than the inner face, a first outwardly extending tooth extending from a location directly above the circular wall to a location farther from the central axis than the outer face, and a first gullet extending downwardly from the rim toward the base, a second cutting group including a second inwardly extending tooth, a second outwardly extending tooth, and a second gullet, and a toothless expanse of the rim extending between the first cutting group and the second cutting group.

Abstract: An outer peripheral surface of a tip end portion of the core body has a tapered surface which is thinner toward the tip end and is edged at the tip end. Recesses 2B are formed at an opening peripheral edge of the tip end portion to attach cutting chips 3. A portion of the core body 2 which is adjacent to a forward portion of each of the recesses in the rotational direction is bent radially inward. Each of the cutting chips 3 has a stepped portion such that a radially inner portion 3a of a forward end portion protrudes forward and a radially outer portion of the forward end portion recedes rearward. A radially inner portion of a rearward end portion of the stepped portion is located forward and a radially outer portion of the rearward end portion is located rearward.

Abstract: A hole cutter for cutting a work piece, such as a wood and/or metal work piece, has a substantially cylindrical blade body defining a wall thickness within the range of about 0.032 inch to about 0.038 inch, and a cutting edge formed on one end of the blade body including a plurality of teeth defining an average tooth pitch within the range of about 3.5 TPI to about 5.5 TPI for cutting the work piece and forming chips therefrom. The substantially cylindrical blade body and cutting edge define an average tooth pitch to blade body thickness ratio of at least about 110.

Abstract: A cutting tool includes a tool body having a first end engageable with a workpiece and a second end engageable with a spindle of a power tool. A blade extends outwardly from the first end of the tool body and including a cutting edge, the cutting edge being engageable with a workpiece to cut the workpiece. A bit, including a drive shaft and a cutting end extends along an axis of the tool body. The drive shaft extends axially outwardly beyond the first end of the tool body and terminates at the cutting end. The cutting end has a maximum cross-sectional width greater than a maximum cross-sectional width of the drive shaft, and an axial distance from the first end of the tool body to the cutting end is greater than a maximum cutting depth of the cutting tool.

Abstract: An arbor is provided for both quick change and standard hole saws. Each hole saw includes a central aperture and at least one drive pin aperture. The arbor comprises an arbor body including an end portion engageable within the central aperture, a drive shank opposite the end portion for engaging a power tool, and an axially extending pilot bit aperture for receiving either a quick change pilot bit or standard pilot bit. The arbor further comprises a drive pin plate having at least one drive pin receivable in a corresponding drive pin aperture of the hole saw for drivingly engaging the hole saw. The arbor further comprises a pilot bit mechanism having a first state for engaging a quick change pilot bit, a second state for engaging a standard pilot bit, and a third state for disengaging and releasing the inserted quick change or standard pilot bit from the arbor body.

Abstract: A cutting tool for cutting a workpiece. The cutting tool can include a tool body having a first end and a second end and defining an axis extending through the first and second ends, a rim extending circumferentially around the first end of the tool body, and a blade having a base supported on the tool body for movement relative to the rim.

Abstract: A plurality of blade tips 4, 5 are provided at the distal end of a blade cylinder having a rotation axis. The blade tips 4, 5 are arranged along a rotation direction at intervals. Each of the blade tips 4, 5 has an outside blade 6 at a farther position from the rotation axis and an inside blade 7 at a closer position to the rotation axis. Each outside blade 6 and the corresponding inside blade 7 are arranged next to each other while being displaced in the rotation direction with the stepped cutting edge 8 in between. In the blade tip 4, which is one of the blade tips 4, 5 adjacent to each other in the rotation direction, the sum of the number of the cutting edge 9 in the outside blade 6 and the number of the cutting edges 11, 12 in the inside blade 7 is three. In the other blade tip 5, the sum of the number of the cutting edge 9 in the outside blade 6 and the number of the cutting edge 10 in the inside blade 7 is two.

Abstract: A cutting tool includes a tool body having a first end engageable with a workpiece and a second end engageable with a spindle of a power tool. A blade extends outwardly from the first end of the tool body and including a cutting edge, the cutting edge being engageable with a workpiece to cut the workpiece. A bit, including a drive shaft and a cutting end extends along an axis of the tool body. The drive shaft extends axially outwardly beyond the first end of the tool body and terminates at the cutting end. The cutting end has a maximum cross-sectional width greater than a maximum cross-sectional width of the drive shaft, and an axial distance from the first end of the tool body to the cutting end is greater than a maximum cutting depth of the cutting tool.

Abstract: To provide a user-friendly core drill which, when forming a large-diameter cut hole by the core drill with respect to an object to be drilled, such as concrete, is able to easily form, for example, a chamfered portion or a countersunk portion with respect to an opening end portion of the cut hole. In a core drill comprising a base body including a shank and a drill core body including a drill cutting blade, a connection opening portion of the drill core body being attached to the base body, the connection opening portion of the drill core body is provided with a concave portion forming member including a large-diameter hole cutting blade, and the large-diameter hole cutting blade is provided outside the drill cutting blade in a radial direction of the connection opening portion.

Abstract: A hole saw includes an arbor, a saw blade assembly having a saw blade and an adapter connected with the saw blade and provided with a protrusion received in an indentation of the arbor, a lid movably mounted on a body portion of the arbor and movable relative to the arbor between a first position where second coupling portions of the adapter are blocked by a block portion of the lid and coupled to first coupling portions of the arbor such that the saw blade assembly can't be rotatable relative to the arbor, and a second position where the second coupling portions of the adapter are staggered with the block portion and uncoupled from the first coupling portions of the arbor through the rotation of the saw blade assembly. Thus, the hole saw has the advantages of reducing vibration in use and convenience in assembly and disassembly works.

Abstract: A removable countersink bit comprises a body, a flange, at least one clamp, and a plurality of cutting teeth. The removable countersink bit creates countersink holes for receiving manhole fixtures and the like.

Abstract: A rotary tool accessory in one embodiment includes a base, a circular wall extending upwardly from the base about a central axis, the circular wall including an inner face, an outer face and a circular rim, a first cutting group including a first inwardly extending tooth extending from a location directly above the circular wall to a location closer to the central axis than the inner face, a first outwardly extending tooth extending from a location directly above the circular wall to a location farther from the central axis than the outer face, and a first gullet extending downwardly from the rim toward the base, a second cutting group including a second inwardly extending tooth, a second outwardly extending tooth, and a second gullet, and a toothless expanse of the rim extending between the first cutting group and the second cutting group.

Abstract: Provided is a core drill which is capable of drilling a hole and consumes small electric power consumption when the core drill is applied to a codeless type electric drill. A core body 2 is formed to have a small thickness. An outer peripheral surface of a tip end portion of the core body has a tapered surface which is thinner toward the tip end and is edged at the tip end. Recesses 2B are formed at an opening peripheral edge of the tip end portion to attach cutting chips. A portion of the core body which is adjacent to a forward portion of each of the recesses in the rotational direction is bent radially inward. Each of the cutting chips 3 is configured to have a stepped portion when viewed from the bottom such that a radially inner portion 3a of a forward end portion 3 protrudes forward in the rotational direction and a radially outer portion of the forward end portion 3 recedes rearward in the rotational direction.

Abstract: A coated hole cutter including an ink-based colored coating applied only to the external surface of the cylindrical blade body of the hole cutter, but not to the surfaces of a circumferentially-extending cutting edge or to the interior surface of the blade body. The ink-based color coating is an ultraviolet activated ink that cures when the coating is exposed to a specific ultraviolet light intensity and wavelength. At least the surfaces of the cutting edge and the internal surface of the blade body, which do not include the coating, have a steam tempered oxide finish that imparts a color that contrasts with the color imparted by the coating.

Abstract: An annular sawing structure comprises: a sawing body including a saw member, a connecting member, and a positioning drill; the saw member including a sawtoothed blade disposed on a front end thereof; the connecting member including a groove being concentric with the saw member and secured on a front end thereof; the positioning drill fitted to the groove of the connecting member and including a cutting insertion fixed on a front end thereof and extending out of a sawtoothed blade of the saw member, the cutting insertion including a reduced end extending rearward therefrom and received in the receiving chamber of the saw member, and an outer diameter of the cutting insertion being lager than that of the reduced end, and the positioning drill further including an engaging end extending out of the connecting member to couple with an engaging head of a tool.

Abstract: The invention comprises a hole-cutting product with a cup-shaped body and a cutting edge along an open end. The cutting edge comprises a diminishing-radius portion for removing an annular band of material from a workpiece and produces a core remainder in the body that is easy to remove.

Abstract: There is provided a capped container in which the angle of rotation of a screw cap required for unsealing the same can be rendered small and in which a cut piece can be prevented from being completely cut away from a container body. The capped container includes a container body (11) including a wall portion and a rupture portion (36) formed at a predetermined position of the wall portion; a tubular base portion attached to the wall portion and surrounding the rupture portion (36); a movable tube (16) disposed in the base portion and thread-engaged with the base portion; and a screw cap (17) disposed outside the base portion, thread-engaged with the base portion, engaged with the movable tube (16), and adapted to rotate the movable tube (16) while being rotated. A cutting member (38) including a plurality of blades (t1 to t6) and adapted to cut the rupture portion (36) as the screw cap (17) is rotated is formed at a lower end of the movable tube (16).

Abstract: A hole saw having efficient slug removal preferably includes a saw cup, a shank portion and a pilot cutting device. A cutting surface is formed on an open end of the saw cup. The inside surface, outside surface and cutting surface of the saw cup are given a low friction treatment. A fluoropolymer resin coating is used for the low friction treatment. The friction treatment is applied by spraying thereof on the saw cup. The saw cup is then heated to a predetermined temperature for a set period of time. The low friction treatment is cured when the saw cup is used. The shank portion is attached to a closed end of the saw cup with any suitable fastening process. The shank portion preferably retains the pilot cutting device.

Abstract: A hole saw having efficient slug removal includes a saw cup, a shank portion, a spade bit, a compression spring and a contact disc. A plurality of cutting teeth are formed on an open end of the saw cup and the shank portion is attached to the other end of the saw cup with any suitable fastening process. The spade bit includes a cutting bit and a shank. A shank opening is formed through the shank portion to receive the shank of the spade bit. Preferably, a set screw or the like is used to retain the spade bit in the shank opening. The shank of the spade bit is inserted through the contact disc and then the compression spring, before insertion into the shank opening. A hole slug is ejected from the saw cup, when the hole saw is removed from a hole.

Abstract: A hole saw having efficient slug removal preferably includes a saw cup, a shank portion and a pilot cutting device. A cutting surface is formed on an open end of the saw cup. An inside surface of the saw cup is given a low friction treatment and preferably an outside surface thereof. The shank portion is retained on a closed end of the saw cup. The pilot cutting device is preferably a drill, but other cutting devices may also be used. A second embodiment of a hole saw having efficient slug removal preferably includes a saw cup, a shank portion and a pilot cutting device. The saw cup includes a prior art saw cup, at least two side openings and a cutting surface. The at least two side openings are formed through the prior art saw cup to remove a substantial portion of a side wall.

Abstract: A lock body in a locked state is inserted radially inward of an outer surface. A stopper body in a contact state holds the lock body in an unlocked state. The stopper body in a non-contact state is retracted from the lock body. A pressing body is switchable between a standby state and a retracted state. The pressing body in the standby state selectively contacts a central shaft when an insertion portion is inserted in a support cylinder. The pressing body in the retracted state is retracted from the stopper body. An urging member urges the pressing body into the standby state, and urges the stopper body into the contact state. The urging member detachably engages the pressing body to the stopper body. Thus, the structure of the cutter holder is simple.

Abstract: A cutting tool includes a tool body having a first end engageable with a workpiece and a second end engageable with a spindle of a power tool. The tool body includes first, second, and third gullets opening through a first end of the tool body and being spaced asymmetrically around a circumference of the first end. The cutting tool also includes a blade extending outwardly from the first end of the tool body adjacent to the first gullet.

Abstract: The front cutting edge is provided with an inner front cutting edge connected with an inner lateral cutting edge and an outer front cutting edge connected with an outer lateral cutting edge. A front flank corresponding to the front cutting edge is provided with an inner front flank corresponding to the inner front cutting edge and an outer front flank corresponding to the outer front cutting edge. An inner front clearance angle of the inner front flank is set at a larger value than an outer front clearance angle of the outer front flank. Therefore, it is difficult for the hole cutter to be chipped, and its cutting performance is also good.

Abstract: A core cutter comprises a cylindrical base, a plurality of cutting portions provided at a tip end of the base, discharge grooves configured to discharge chips cut by the cutting portions, and an attaching portion. Each of the cutting portions 2 includes a block and at least three cutting blades. A first cutting blade 2a may be located radially inward relative to the second and third cutting blades 2b and 2c and the second cutting blade 2c is located between the first and third cutting blades in a radial direction, and the cutting blades deviate rearward in a rotational direction. A wall 3b of the discharge groove 3 corresponds to a cutting surface 2k of the third cutting blade, and a gallet 4 is provided adjacent each cutting portion, the gallet formed by cutting an outer peripheral surface of a tip end portion.