Abstract: An auto-adjusting pocket hole jig docking station including a housing and an adjustment mechanism. The adjustment mechanism carried by the housing and including a first rack and a second rack reciprocally movable between raised and lowered positions, relative the body. A double pinion gear is rotatably carried by the housing with a first gear in meshing engagement with the first rack and a second gear in meshing engagement with the second rack. The first gear and the second gear having a rotational ratio therebetween wherein movement of one of the first rack and the second rack moves the other of the first rack and the second rack a distance proportional to the rotational ratio.

Abstract: A cut warning system can include a valve sleeve defining a cavity, the valve sleeve defining a bottom sealing surface within the cavity; a pipeline extending through the cavity; a drilling machine including a shell cutter, the shell cutter defining a bottom edge, the drilling machine configured to axially advance the shell cutter from a pre-engagement position towards the bottom sealing surface, the pipeline positioned between the shell cutter and the bottom sealing surface in the pre-engagement position; and a signaling element positioned within the cavity, the signaling element configured to produce a signal when the shell cutter reaches a post-engagement position, the bottom edge being axially positioned between the pipeline and the bottom sealing surface.

Abstract: A tool that mounts on a power driver or other tool for installing framing members in a building ensures proper and uniform spacing of the framing members. A support that may be a C-shaped band clamp removably attaches to the power tool. A generally tubular gauge body snap-attaches in place and a slide member disposed within the gauge body is adjustable to extend a sufficient amount so the combined length of the tubular gauge body and the extended slide member provide a proper spacing for the framing members. A slide lock for holds the slide member at the extended position. This allows the measuring and installation to be done without the installer having to set the power tool down or use a ruler or tape measure once the spacing is established.

Abstract: Multi-adaptive fast loading attached air-cooled dust removal equipment is disclosed. The equipment is mainly composed of five parts: a spindle clamping mechanism, a link mechanism, a bearing connecting mechanism, an axial telescopic mechanism and a dust treatment mechanism. The equipment is connected with a tool holder through an axial connecting mechanism and installed on a machine tool. The axial telescopic mechanism forms a cavity with a processing surface, the gas flow generated by a negative pressure vacuum cleaner forms negative pressure in the cavity, and the telescopic mechanism is fixed to a machine tool spindle housing through the link mechanism to prevent the rotation of the spindle from driving the equipment to rotate and interfere with a workpiece, finally realizing rapid collection and treatment of chips.

Abstract: A power tool assembly includes a hand-held power tool, a dust collector removably coupled to the power tool, and first and second power tool battery packs each of which is interchangeably coupled with the power tool and the dust collector for separately powering the power tool and the dust collector, respectively.

Abstract: A punching tool to make holes in a part made of a sheet metal or a multi-layer assembly of sheet metals, for example a part for the body of a vehicle. The punching tool includes a punch holder holding a one-piece cutting punch and a punch die arranged in front of the punch holder, the punch holder being designed to move the punch toward the die from a rest position to a work position in which the cutting punch cuts out a hole in the part placed between the punch holder and the die. The cutting punch is removably housed in a cavity formed in the punch holder so that, when the punch holder withdraws from the work position to the rest position, the cutting punch separates from the punch holder and remains in the hole pierced in the part.

Abstract: A cut warning system can include a valve sleeve defining a cavity, the valve sleeve defining a bottom sealing surface within the cavity; a pipeline extending through the cavity; a drilling machine including a shell cutter, the shell cutter defining a bottom edge, the drilling machine configured to axially advance the shell cutter from a pre-engagement position towards the bottom sealing surface, the pipeline positioned between the shell cutter and the bottom sealing surface in the pre-engagement position; and a signaling element positioned within the cavity, the signaling element configured to produce a signal when the shell cutter reaches a post-engagement position, the bottom edge being axially positioned between the pipeline and the bottom sealing surface.

Abstract: A depth limiting device includes a braking structure; a limited shrinking structure, the limited shrinking structure including a part that surrounds a moving object and being in a home position or a compressed position; and a structure adapted for pushing the limited shrinking structure to the home position. The braking structure brakes the moving object such that the moving object moves together with the depth limiting device. When the moving object enters into a subject, the part of the limited shrinking structure is pressed against the subject, and the limited shrinking structure moves from the home position to the compressed position and stops the moving object from entering further into the subject.

Abstract: A surgical drill for use with a drill bit. The drill includes a handpiece with a motor and a brake mechanism. The brake mechanism is a sliding rack adjacent a first end and a second end with a stop adjacent the drill bit. An actuator is mounted to the handpiece and a plunger is coupled to the actuator. A sensor asserts a signal when the drill bit penetrates bone. When the sensor asserts the signal indicting the drill bit penetrated bone, the actuator moves the plunger into engagement with the rack to prevent further insertion of the drill bit.

Abstract: A fastening device for a dust extraction device is configured to detachably connect the dust extraction device to a hand-held power tool. The fastening device includes a first connection unit and a second connection unit. The first connection unit is configured to connect the dust extraction device to the hand-held power tool by form closure. The second connection unit is configured to connect the dust extraction device to the hand-held power tool by force closure.

Abstract: A rotary bit configured to deburr and swage an end of a tube, comprising a first end configured to deburr and swage the end of the tube, and a second end configured to be secured to a rotary device, wherein the first end includes a plurality of blades that extend axially along the first end and radially outward from the rotary bit, the plurality of blades including a plurality of leading blades and a plurality of finishing blades, the leading blades configured to initially deburr and swage the end of the tube upon insertion of the rotary bit into the end of the tube, and the finishing blades configured to complete deburring and swaging of the end of the tube, the finishing blades extending radially outward from the rotary bit to a greater extent than the leading blades.

Abstract: A driver device comprises a housing and a driving-bit socket in the housing. The driver device may comprise a first guide-leg track on the housing. A first guide leg may be inserted into the first guide leg track. The driver device may also comprise a first guide-leg foot at an end of the first guide leg. The first guide-leg foot may be configured to interface with a surface of the driving recipient. The first guide leg may retract into the first guide-leg track as the driver device drives a driving object into the driving recipient.

Abstract: A cutting tool having a shank and a cutting head, wherein the shank carries a depth stop, which limits penetration depth into a workpiece, via at least one pivot bearing, and the depth stop is spring-preloaded away from the cutting head, via the at least one pivot bearing, against a shank-side stop.

Abstract: The present invention relates to a depth adjustment stopper for a drill bit. The present invention enables easy workability during forming of a drilled groove having a fixed depth into a material by means of a drill bit. The depth adjustment stopper coupled to the drill bit is supported by means of the tension of a spring. Therefore, the depth adjustment stopper is prevented from shaking or being pushed.

Abstract: A drilling aid system which comprises a body with a first cavity, a shaft mounted to be able to rotate within the first cavity, a slider which has a proximal end mounted to be able to move in translation within the first cavity, where the slider has a second cavity which extends the first cavity, a collar that is able to move in translation on the shaft, a first compression spring having a first stiffness and pressing against the collar and against the proximal end of the slider, and a second compression spring having a second stiffness greater than the first stiffness, and pressing against the collar and against the proximal end of the body. A system of this kind makes it possible to make the user perceive that the end of the drilling operation is nigh and that therefore the force applied to the drill should be reduced.

Abstract: An orienting apparatus for arranging on a turning tool and for orienting a bore or depression to be introduced or for orienting a finishing step with respect to a normal to the surface of a workpiece, comprising a main body having a through-hole for receiving the tool shank or the tool tip in an orienting direction, and at least two probe elements for oriented support on the surface of the workpiece. As a result of an orienting movement of the orienting apparatus with respect to the normal to the surface of the workpiece, all of the probe elements form an electric circuit between an electrical current source contained in the main body and the signaling device, said electric circuit being closed by a series circuit activated by the probe elements. Furthermore, a method for orienting a bore or depression or for orienting a finishing step with an orienting apparatus.

Abstract: A tool alignment device for mounting on a tool having a stop, especially on a drilling and/or countersinking tool having a single-piece tool shaft and a stop, for alignment of a drill hole and/or countersink to be introduced or for alignment of a finishing step in relation to a normal to the surface of a workpiece, comprising a main part and a through hole. Upon mechanical contact between the tool alignment device and the surface of the workpiece, a signaling device is actuated and emits alignment signal(s) during alignment in an alignment direction, and the stop of the tool can be accommodated in the main part, which comprises a guide device which establishes a connection between a stop sleeve of the stop and the tool alignment device such that the stop can be aligned in the alignment direction. Also, a drilling, milling and/or countersinking tool having a stop.

Abstract: A device is provided for sterile coupling of a percutaneous surgical instrument to a rotary drive tool (5). The device has a flexible envelope (1) confining the drive tool (5), a connector piece (3) coupling to the percutaneous surgical instrument via one end, and to the drive tool (5) via its other end, by passing through the envelope via an opening (12) A tubular ring (2) is positioned on the inner surface of the envelope (1) in the area of the opening (12) and is configured to rigidly connect the envelope (1) to the body of the drive tool (5). The connector piece (3) passes through the ring and turns freely inside the ring when driven by the rotary drive tool (5). The connector piece (3), the ring, and the envelope interact in order to form a leaktight barrier between the inside and the outside of the envelope (1) in the area of the opening (12).

Abstract: A countersinking tool, comprising a tool shank and a tool head with multiple deburring or countersinking edges and an insertion pin. In some embodiments, the insertion pin features at least one reaming edge, on a radially outer side and extends over less than 33% of the overall length of the insertion pin, wherein the reaming edge can be inserted into an unfinished bore with a diameter, smaller than a nominal diameter of the bore, in a cutting fashion, wherein the reaming edge acts as a drill bit and is arranged on the insertion pin at a radius that corresponds to the radius of a nominal diameter of the bore, and wherein the insertion pin has the nominal diameter of the bore and can be guided in the bore without play. Also, a tool arrangement with a countersinking tool and to a method for producing a countersunk and/or deburred bore.

Abstract: An edge break apparatus including a frame having a first workpiece interface surface, a second workpiece interface surface arranged relative to the first workpiece interface surface so as to form a predetermined angle between the first workpiece surface and the second workpiece surface, and a first aperture extending through the frame so as to intersect the predetermined angle, and an edge break member extending through and interfaced with the first aperture so as to adjustably define a cutting depth of the edge break member relative to an apex of the predetermined angle.

Abstract: A tissue illumination system and a method for harvesting a section of a blood vessel from a patient's body for further use. The tissue illumination system includes a light catheter inserted into a lumen of the blood vessel section to illuminate the vessel section and vessel side branches with an intensity which is visible to the physician from an exterior of the vessel section and also includes a viewing element insertable into the lumen and capable of viewing the illuminated vessel section. The tissue illumination system also includes at least one tool insertable into the lumen and used to harvest the vessel section.

Abstract: A measurement system and method for determining a depth of penetration of a working portion of a surgical instrument (e.g., a rotating drill bit in a bore). A first sensor outputs a first signal representative of a displacement of the leading edge of the drill bit in the bore. A second sensor outputs a second signal representative of a force applied to the leading edge of the drill bit. A processor outputs a third signal representative of the depth of penetration of the leading edge of the drill bit when the leading edge of the drill bit passes from a first medium having a first density to a second medium having a second density. The third signal is based on the first and second signals.

Abstract: Unicortical path detection for a measurement system for monitoring a depth of penetration of a working portion of an instrument in a bone of a patient. The unicortical detection may compare an average cortex thickness in a bicortical path to an actual measured depth of penetration. If the actual depth of penetration exceeds the average thickness, a unicortical path may be detected. Upon detection of a unicortical path, an alert may be provided and/or the instrument may be arrested upon subsequent breaching of the cortex.

Abstract: Use of measurement system and detection module with a burr instrument for surgical procedures. The measurement system may include sensors (e.g., displacement, acceleration, and/or force sensors) that may be utilized to detect potentially hazardous operation of the burr instrument. For example, when penetrating through the cortex of the bone the measurement system may be operated in a unicortical mode such that when the burr passes through the cortex of the bone, the instrument operating may be arrested to avoid damage to surrounding tissue. Moreover, the system may be utilized to detect a slip or sudden loss of contact of the burr instrument such that the instrument may be arrested to avoid damage to surrounding tissue. Furthermore, the burr instrument may have a predetermined ramp-up speed.

Abstract: A flange removal tool assembly includes a cutting tool actuator, vise, annular cutting tool, and center support and accurately removes a weld and a flange of a device, while the device is attached to a fitting in a pressure vessel. Once the weld and the flange are removed, the device can be removed from the fitting and replaced. The assembly allows the operator to quickly inspect the flange of the device during the removal process and reduces the probability of damaging a flange of the fitting.

Abstract: Example alignment devices for aligning a drill bit with respect to a pilot hole and methods of use are described herein. An example alignment device includes a base having a first surface and a second surface, where the first surface is opposite the second surface. The alignment device also includes an alignment pin extending from the first surface of the base. The alignment device also includes a support extending from the second surface of the base and positioned such that a longitudinal axis of the alignment pin is separated from the support by an offset distance. An inner surface of the support has a radius of curvature along a length of the support. The radius of curvature is substantially equal to the offset distance, and a center of curvature of the support is coaxial with the longitudinal axis of the alignment pin.

Abstract: A bone plate holder apparatus having a hollow shaft, two or more prongs at a working end, and a rod slidingly disposed within the shaft can be attached with a bone plate such that the prongs interact with a fenestration in the bone plate. When the rod is depressed between the prongs, working surfaces of the prongs grip the interior surfaces of the fenestration, causing the bone plate holder apparatus to lock to the bone plate. Bone plate holder systems including a bone plate holder apparatus and bone plate can be used to install a bone plate in a surgical site in a patient, and the locking and unlocking functionality of the bone plate holder apparatus can permit adjustment of an angle of the bone plate holder apparatus relative to the bone plate with ease during surgery.

Abstract: A guide device comprising a hollow body configured to receive a drill bit, the hollow body having a first end; a second end; and a continuous section intermediate the first end and the second end; an opening extending from the first end through the continuous section to the second end; and at least one aperture located on the hollow body intermediate the first and second end of the hollow body.

Abstract: An adjustable drill depth guide includes a first sleeve, a second sleeve and a stop member. The first sleeve includes a longitudinal axis and defines a helical slot disposed about the longitudinal axis. The second sleeve is concentrically arranged relative to the first sleeve and is axially adjustable relative to the first sleeve for adjusting a length of the adjustable drill depth guide. The stop member extends radially from the second sleeve and is disposed in the helical slot. The stop member is selectively received at various positions along the helical slot to positively locate the second sleeve relative to the first sleeve in the axial direction.

Abstract: The invention relates to a stop for a rotating drilling, milling or countersinking tool which comprises a stop sleeve which is freely rotatably coupled, by means of a sliding or rolling bearing, around the tool. A first bearing bush of the bearing supports the stop sleeve. A second bearing bush of the bearing sits in a rotationally fixed manner on a shaft sleeve. The shaft sleeve can be pushed and fastened on a shaft of the tool. In a secondary aspect, the invention relates to a drilling, milling or countersinking tool having such a stop.

Abstract: A precision case holder engages the extraction groove of the rim of a straight wall case and established a fixed distance between a base of the case and a precision forward surface of the holder. The case may then be inserted into a case trimmer and the holder establishes a repeatable distance between the base of the case and a cutting tool in the case trimmer. The holder includes a tapered slot with edges which engage the extraction groove and a threaded piston which is tightened against the base of the case. The case slides into the tapered slot until the taper resists further sliding, and the piston is tightened to retain the case.

Abstract: A device for use in drilling is adapted to be used in cooperation with a drilling unit that comprises a bush inside which a drill bit can advance and retract relative to the bush, the bush being provided with an opening from which the drill bit can protrude towards a workpiece or an arrangement of workpieces. The device includes a first portion and a second portion. The first portion is formed so as to fit into the opening of the bush. The second portion is formed so as to fit into a pre-drilled pilot hole in the workpiece or in at least one workpiece of the arrangement.

Abstract: A cutting portion, which is rotatable in a direction of rotation about an axis of rotation, is disclosed. The cutting portion has an annular portion, one or more cutting elements which are disposed on a first end of the annular portion, and an insertion element which is disposed on the annular portion at an end that is remote from the cutting elements. The insertion element has at least one slit-shaped clearance with a cross-slit and a connecting slit, where the cross-slit is arranged perpendicularly in relation to the axis of rotation and is connected by way of the connecting slit to an upper edge of the insertion element.

Abstract: A nail head removal tool is disclosed to be rotated by an electric drill to cut off the rusted head of a nail that has been driven into a wooden surface. The nail head removal tool includes an outer cutting body having a cylindrical cutting end with a plurality of cutting teeth extending therearound. An inner cutting insert is press fit into an insert cavity formed in the cylindrical cutting end of the outer cutting body. The inner cutting insert has a pair of cutting blades spaced from one another and standing upwardly from a cutting head of the insert. When a rotational force is applied to the tool, the cutting teeth at the cutting end of the outer cutting body cut into the surface around the nail, and the cutting blades at the cutting had of the inner cutting insert cut off and pulverize the rusted nail head.

Abstract: A fastener for fastening a drill jig to overlapping work pieces and clamping the overlapping work pieces for facilitating accurate drilling of the overlapping work pieces including a fastener body and a damper assembly operatively connected to the fastener body. The damper assembly is configured to enable application of a first load to the drill jig, and the fastener body is configured to enable application of a second load to the overlapping work pieces when the fastener fastens the drill jig to the overlapping work pieces. The first load is less than the second load. The first load is sufficient to hold the drill jig to the overlapping work pieces during drilling but without causing significant deformation of the drill jig. The second load is sufficient to reduce the formation of burrs during drilling of a hole through the overlapping working pieces.

Abstract: Apparatus and methods for performing and controlling the sequence of steps in a multi-step machining process utilizing a plurality of drilling units, where each drilling unit is configured to perform at least one step of the multi-step machining process. Air pressure sensors in each drilling unit measure air pressures at the surface of a workpiece where the cutting tool of the drilling unit is engaged, which measured air pressures indicate air flow at the surface. These air flows in turn indicate the state of the machining at the surface of the workpiece, and based on the state of the machining, a machine control system will determine whether a drilling unit can perform its particular machining operation in the proper sequence on the workpiece.

Abstract: A pilot pin assembly is slidably receivable within a tool bit of a drill press. The pilot pin assembly includes a first pin defining an interior cavity, and a second pin at least partially received within the interior cavity of the first pin. A spring is positioned within the interior cavity for biasing the second pin toward an extended position relative to the first pin.

Abstract: A measurement system and method for determining a depth of penetration of a working portion of a surgical instrument (e.g., a rotating drill bit in a bore). A first sensor outputs a first signal representative of a displacement of the leading edge of the drill bit in the bore. A second sensor outputs a second signal representative of a force applied to the leading edge of the drill bit. A processor outputs a third signal representative of the depth of penetration of the leading edge of the drill bit when the leading edge of the drill bit passes from a first medium having a first density to a second medium having a second density. The third signal is based on the first and second signals.

Abstract: The present disclosure is for a device, tooling, methods of use and kits containing the cranial plates and bur hole covers used for resecuring a cranial flap after a craniotomy. The cranial repair system is meant to reduce the profile of cranial plates or bur hole covers on the external surface of the cranium after a craniotomy is performed. The embodied devices of present disclosure are designed to reside substantially within the kerf or bur holes and thus minimize the surface area of devices resides on the external surface of the cranium. Additional embodiments include kits, tooling and methods to further reduce and/or eliminate the external profile of the cranial plate on the external cranial surface.

Abstract: A counterbalance system employs one or more springs to support a large motor drill on an upper horizontal work surface, for example on the tops of drill jigs or bushings. The counterbalance system supports the drill above the work surface where the counterbalance system can slide across the work surface to selectively position the drill over a drill bushing through which a drilling operation is to be performed. A user of the drill supported on the counterbalance system can then push downwardly on the drill to compress the spring and perform a drilling operation. On removal of the downward directed force exerted by the user of the drill, the spring pushes the drill upwardly to disengage the drill from the work surface. The user of the counterbalance system can then slide the counterbalance system and the drill across the top of the work surface.

Abstract: A safety drilling tool having a tapered drill bit that drills through materials, such as metal, without producing any torque or heat is provided. The safety drilling tool may provide safety for the operator of the tool while drilling or cutting into electrical/electronic enclosures, such as switchgear. The bit may include a smooth graduated cam on the cutting portion eliminate the usage of steps as is the conventional practice in the art. The drill bits may be different sizes to reduce the bulkiness for sake of convenience. The bits may have a one or more internal helical flutes for pushing the debris through the hole being drilled. The hole saw portion of the bit draws the material into the center of the bit until the initial hole is made allowing the debris from the tapered bit to flow through hole being drilled.

Abstract: An automated apparatus for use in selectively installing temporary fasteners in an assembly is provided. The apparatus includes an end effector, a cutting mechanism coupled to the end effector and that forms an opening in the assembly when a potential opening location is substantially aligned with a cutting mechanism center point. The apparatus also includes at least one of a first sub-assembly and a second sub-assembly coupled to the end effector. The first sub-assembly includes a temporary fastener insertion mechanism that inserts a temporary fastener through the opening in the assembly when the opening is substantially aligned with an insertion mechanism center point different from the cutting mechanism center point. The second sub-assembly includes a temporary fastener removal mechanism that removes installed temporary fasteners from the assembly when the installed temporary fastener is substantially aligned with a removal mechanism center point different from the cutting mechanism center point.

Abstract: A cylindrical drill body for a hole saw has cutting teeth on an end side and at least one cutout, which is located in a lateral surface of the cylindrical drill body at a distance from the cutting teeth. The cutout has a rectilinear boundary edge directed parallel to the end side.

Abstract: The present disclosure provides methods for forming or enlarging holes in bone tissue and methods for fixing medical plates to bodies. The present disclosure also provides for products produced by the methods of the present disclosure and for apparatuses used to perform the methods of the present disclosure.

Abstract: Disclosed herein is an exchangeable needle cartridge for a drilling measuring device with a guiding device for a drilling needle. The guiding device includes a telescopic tube with a plurality of telescopic tube sections which extends between a working end, at which a retainer for retaining the drilling needle in a rotationally fixed manner is arranged, and a docking end, at which a docking device for coupling the telescopic tube to a driving device of the drilling measuring device is arranged. Also disclosed is a docking device comprising a coupling device for transmitting torque from the driving device of the drilling resistance measuring device to the telescopic tube, a transmission device for converting the rotational motion of the driving device of the drilling measuring device into a linear motion of the telescopic tube, and furthermore structure for detachably fastening the exchangeable needle cartridge to the drilling measuring device.

Abstract: A reverse spot-facing tool for cutting a reverse spot-face in a workpiece using a reverse spot-facing cutter configured to engage a pilot shaft having a first end and a second end is disclosed. The workpiece comprises a through hole having a central axis. The reverse spot-facing tool comprises a stop configured to be located between the first end and the second end of the pilot shaft; a biasing assembly that generates a first thrust force and an equal and opposite second thrust force when the reverse spot-facing cutter is cutting the reverse spot face; and a thrust bearing configured to be positioned between the biasing assembly and the stop. When the reverse spot-facing cutter is cutting the reverse spot-face, the thrust bearing transmits the second thrust force from the biasing assembly to the stop, and the biasing assembly transmits the first thrust force to the workpiece.

Abstract: A power tool has a base for supporting the power tool on a surface. A frame is supported on the base and includes a track that extends longitudinally along the frame. A fixed gib is attached to one side of the frame and a movable gib is attached to the other side of the frame. The movable gib can move with respect to the frame. A slide is positioned between the fixed gib and the movable gib for longitudinal movement with respect to frame and is constrained from lateral movement by the fixed gib and the movable gib.

Abstract: A hand-held power tool includes a motor having a stator and a rotor, the motor being configured to rotate the rotor at a speed of at least 40,000 rpm, an output shaft directly driven by the rotor, a tool accessory shaft configured to support a tool accessory, and a two-stage speed reducing transmission operably connecting the output shaft to the tool accessory shaft. The two-stage speed reducing transmission is configured to drive the tool accessory shaft at a rate less than the rotor speed, for example, at a rate less than or equal to 37.5% of the rotor speed.

Abstract: A measurement system and method for determining a depth of penetration of a working portion of a surgical instrument (e.g., a rotating drill bit in a bore). A first sensor outputs a first signal representative of a displacement of the leading edge of the drill bit in the bore. A second sensor outputs a second signal representative of a force applied to the leading edge of the drill bit. A processor outputs a third signal representative of the depth of penetration of the leading edge of the drill bit when the leading edge of the drill bit passes from a first medium having a first density to a second medium having a second density. The third signal is based on the first and second signals.

Abstract: A tap tool assembly includes a tap, a retaining member and a sleeve. The tap has a thread cutting section and a shaft section. The retaining member is fixed to the shaft section of the tap adjacent to a first end of the thread cutting section. The sleeve has a central bore extending therethrough. A surface of the sleeve defines the central bore and has a shoulder. The sleeve is coupled to the shaft section of the tap for movement between a first position completely covering the thread cutting section and a second position exposing at least a portion of the thread cutting section, with the sleeve being biased to move toward the first position.