Abstract: A metal wire containing tungsten is provided. A tungsten content of the metal wire is at least 90 wt %. A tensile strength of the metal wire is at least 4000 MPa. An elastic modulus of the metal wire is at least 350 GPa and at most 450 GPa. A diameter of the metal wire is at most 60 ?m. An average crystal grain size of the metal wire in a cross-section orthogonal to an axis of the metal wire is at most 0.20 ?m.

Abstract: The invention relates to a rotary tool (1; 101; 201; 301; 401) for cutting large inside diameters at the outer circumference (2) of which at least one cutting edge (4; 104; 204) is arranged, comprising a support structure (10; 110; 210; 310; 410) which includes a supporting area (14; 114; 214) which indirectly or directly supports the cutting edge (4; 104; 204), and comprising a chucking portion (24; 124; 224; 324; 424) for coupling to a tool holder, wherein the support structure (10; 110; 210; 310; 410) is designed in light-weight construction and the area (14; 114; 214) of the support structure (10; 110; 210; 310; 410) indirectly or directly supporting the cutting edge (4; 104; 204) is limited regarding thermal expansion by a corset structure (12; 112; 212; 312; 412).

Abstract: The invention relates to a rotary tool (1; 101; 201) for cutting large inside diameters at the outer circumference (2) of which at least one cutting edge (4) is arranged, comprising a support structure (10; 110; 210) which indirectly or directly supports the at least one cutting edge (4), and comprising a chucking portion (24) for coupling to a tool holder, wherein the support structure (10; 110; 210) widens in an umbrella-type manner starting from a coupling portion (11) adjacent to the chucking portion (24) and is radially stiffened by a stiffening structure (12).

Abstract: A method of yielding a thinner product wafer from a thicker base SiC wafer cut from a SiC ingot includes: supporting the base SiC wafer with a support substrate: and while the base SiC wafer is supported by the support substrate, cutting through the base SiC wafer in a direction parallel to a first main surface of the base SiC wafer using a wire as part of a wire electrical discharge machining (WEDM) process, to separate the product wafer from the base SiC wafer, the product wafer being attached to the support substrate when cut from the base SiC wafer.

Abstract: Methods and apparatus to control hot-start weld current for arc ignition are disclosed. An example welding-type power supply includes a power converter to output welding-type current, a temperature monitor to determine a temperature of an electrode using at least one of a temperature measurement or a thermal model, and a current controller to control a hot-start weld current output by the power converter based on the temperature of the electrode.

Abstract: A device for measuring the depth of a weld seam in real time during the welding or joining of a workpiece by means of radiation, including: its measuring light source, the light of which is coupled by a beam splitter into a reference arm and a measuring arm; a collimator module having at least one collimation lens for collimating a measuring light beam, which is fed to the collimator module via an optical waveguide in the measuring arm, and for imaging the measuring light beam, which is reflected from a workpiece to be processed, on an exit/entry surface of the optical waveguide; a coupling element for coupling the measuring light beam into the beam path of a processing beam; a focusing lens for the joint focusing of the measuring light beam and the processing beam on the workpiece and for the collimating of the reflected measuring light beam; and an analysis unit for determining the depth of a weld seam, into which the measuring light reflected from the workpiece is guided with the superimposed, reflected li

Abstract: A method for the connection of components or component regions and a non-releasable connection produced in this manner. Two connection faces are partially welded to each other with an adhesive layer being incorporated between the two connection faces. The method including the following steps: arranging a welding base on a connection face, applying the adhesive layer to a connection face, moving the connection faces toward each other in such a manner that the welding base is applied against the other connection face, introducing welding current in the region of the applied welding base. A spacer is arranged between the connection faces before the connection faces are moved toward each other. The connection faces are spaced apart from each other in the region of the welding base by the extent that the welding base projects above the spacer.

Abstract: A capacitive discharge welding system includes at least one capacitive discharge-based power supply that is adapted to provide alternate polarity pulses from a first weld to a subsequent weld, and to be compatible with iron-core transformers used for alternating current resistance welding; at least one iron core transformer adapted to receive electrical discharges from the capacitive discharge-based power supply; a polarity switching network that includes at least two sets of silicon controlled rectifiers that are arranged in pairs for facilitating current flow in alternate directions; a pair of engagable, properly biased shunt diodes that are operative to shunt reflected current for protecting the silicon controlled rectifiers when the system is in use; and a control network configured for simultaneous engagement of the properly biased shunt diodes and firing the silicon controlled rectifiers for current flow; and tracking polarity for assuring that subsequent pulses use opposite direction current flow for p

Abstract: A vehicular differential device includes a differential case, a ring gear, and a welded portion positioned on an abutting surface where the differential case and the ring gear are in contact with each other. The welded portion is configured to join the differential case and the ring gear for integral rotation of the differential case and the ring gear around a rotation axis of the vehicular differential device. The welded portion includes a plurality of welding surfaces positioned at predetermined intervals along a circumferential direction around the rotation axis.

Abstract: An apparatus for bonding a mask includes a body and a pressing unit on the body. The pressing unit has a gas outlet for spraying pressing gas toward the bonding area of the mask.

Abstract: A laser beam irradiation apparatus including a laser source configured to emit light; a collimator configured to collimate the emitted light; a scanner configured to adjust the collimated light to change an irradiation direction thereof; a first lens part configured to focus the adjusted light to irradiate a laser beam on a sealing part; a camera configured to receive visible light passing through the scanner; a heat sensing part configured to receive infrared (IR) light passing through the scanner; and a control part configured to control a moving direction and an intensity of the laser beam.

Abstract: A method for manufacturing a member having a through hole includes a primary formation step, an intensity determination step, a laser modulation step, and a secondary formation step. The primary formation step includes radiating a laser beam to a workpiece member to form a pilot hole having a smaller inner diameter than the through hole while receiving light from the workpiece member at a light detection unit. The intensity determination step includes determining whether a light intensity is equal to or less than a predetermined threshold value. The laser modulation step includes modulating a spatial light phase of the laser beam the intensity of the light is equal to or less than the predetermined threshold value. The secondary formation step includes radiating the laser beam having the modulated spatial light phase to a peripheral part of the pilot hole to form the through hole.

Abstract: A customizable powder bed containment system for use with a direct metal laser melting (DMLM) system includes a plurality of interlinkable containment walls mechanically couplable on a build plate of the DMLM system as well as mechanically coupleable to another interlinkable containment wall of the plurality of interlinkable containment walls, and at least one actuator mechanically coupled to at least one interlinkable containment wall of the plurality of interlinkable containment walls. The at least one actuator is operable to selectively raise the at least one interlinkable containment wall of the plurality of interlinkable containment walls axially relative to a build surface of the build plate.

Abstract: A method of fabricating a part includes: a) supplying powder particles; b) melting a first quantity of power with a beam and forming, on a support, a first pool including the melted powder and a portion of the support; c) forming a second pool by melting a second quantity of powder on the support; d) repeating c) to form a first layer; e) heating an [n]th quantity of the powder, and forming an [n]th pool above the first layer; f) heating an [n+1]th quantity of the powder, and forming an [n+1]th pool downstream from the [n]th pool above the first layer; g) repeating f) to form a second layer above the first layer; and h) repeating e) to g) until the part is constructed. The powder particles reaching each pool are at a temperature well below the pool temperature.

Abstract: An induction heating coil includes a coil section configured to heat a treatment target by induction, a power supply section configured to supply power to the coil section, and a cooling medium passage that is arranged in the power supply section and the coil section, and is configured to supply a cooling medium to the coil section. The coil section, the power supply section, and the cooling medium passage are formed using a metal additive fabrication method.

Abstract: An additive manufacturing system and method for forming a part of dissimilar materials. The additive manufacturing system may include a build platform, a recoater for dispensing build powder onto the build platform, an energy source, a foil feed assembly, and a controller for controlling actuation of these components. The method of forming the part may include the steps of depositing a layer of build powder onto the build platform surface, melting selected portions of the layer of build powder, applying a sheet of foil over the layer of build powder, melting selected portions of the sheet of foil onto the layer of build powder, removing the sheet of foil from the layer of build powder, and then lowering the build platform surface to prepare for deposition of a next layer of the build powder. These steps are then repeated one or more times, thereby forming the part.

Abstract: Semiconductor layers useable for minimizing or preventing the growth of metal whiskers, as well as devices and methods utilizing the same and kits for making the same, are described. The semiconductor layers may be nickel oxide layers. In some embodiments, an electronic device may include a substrate, a first metal layer on the substrate, a semiconductor layer comprising NiO on the first metal layer, and a second metal layer on the semiconductor layer. In some embodiments, an electronic device may include a substrate, a semiconductor layer comprising NiO directly on the substrate, and a metal layer directly on the semiconductor layer. A method for making an electronic device may include depositing a semiconductor layer comprising NiO on a substrate, and depositing a metal layer on the semiconductor layer, where the semiconductor layer substantially prevents the growth of whiskers on the metal layer.

Abstract: A solder alloy having an alloy composition consisting of, in mass %, Ag: 1% to 4%, Cu: 0.5% to 0.8%, Bi: more than 4.8% and 5.5% or less. Sb: more than 1.5% and 5.5% or less, Ni: 0.01% or more and less than 0.1%, Co: more than 0.001% and 0.1% or less, the balance being Sn. The alloy composition satisfies the following three relationships: 0.020%?Ni+Co?0.105%; 9.1%?Sb+Bi?10.4%; and 4.05×10?3?(Ni+Co)/(Bi+Sb)?1.00×10?2, where Ni, Co, Bi, and Sb each represent a content (mass %) thereof in the solder alloy.

Abstract: A bolt repair platform includes a frame and a tool module. The tool module includes a tool having a first end configured to rotationally engage a bolt. The tool module also includes an actuator disposed between the tool and the frame so that actuation of the actuator moves the tool with respect to the frame. The frame is removably disposed on the structure, and the tool is movable with respect to the frame, so that, at each of a plurality of positions, the second end of the tool is capable of engagement with a respective bolt disposed in an internal support structure of a nuclear reactor vessel.

Abstract: Methods of superalloy article repair are provided. In some embodiments, a method for repairing a nickel-based superalloy article comprises providing a layered assembly over a damaged region of the nickel-based superalloy article, the layered assembly comprising a nickel-based superalloy preform, an infiltration alloy preform and a melting point depressant component. The layered assembly is heated to form a nickel-based filler alloy metallurgically bonded to the damaged region, wherein primary carbide and secondary carbide phases are present in the nickel-based filler alloy in a combined amount of 0.5 to 10 vol. %.

Abstract: A novel head device generally consisting of at least one aperture that is capable of excepting different sizes of safety wire, at least one cam-locking lever, which may incorporate a spring return mechanism, is disclosed. The body may be rotated by a mechanical means which twists the safety wire. In preferred embodiment, the various elements of the safety wire twister device are each configured with means of limiting torque or twists of safety wire to eliminate possibility of over torqueing or twisting of safety wire.

Abstract: A machine for gluing a ring-shaped workpiece prior to machining operations. The machine includes a support assembly adapted to receive a removable support element having a top surface for receiving a workpiece; a glue dispenser system adapted to apply a predefined amount of glue on a face of at least one of the workpiece and the support element; a gripper assembly for placing a workpiece on the support element; an illuminating system adapted to illuminate the applied glue with ultraviolet light, this illuminating system including: at least one inner lighting element for radially illuminating an inner radial face of the ring-shaped workpiece with ultraviolet light, and at least one outer lighting element for radially illuminating an outer radial face of the ring-shaped workpiece with ultraviolet light.

Abstract: Automated fixture layout is approached in two distinct stages. First, the spatial locations of clamping points on the work piece are determined to ensure immobility of the fixtured part under any infinitesimal perturbation. Second, spatial locations are matched against a user-specified library of reconfigurable clamps to synthesize a valid fixture layout or configuration that includes clamps that are accessible and collision free. The spatial locations matching during the second stage can be the same spatial locations chosen in the first stage to ensure immobility, or a different set of spatial locations.

Abstract: A machine tool includes: a tool holder which includes a key groove; a spindle drive unit which includes a spindle key that can be fitted into the key groove of the tool holder and a spindle and which removably holds the tool holder; a tool exchanger which includes a grip key and a grip that holds the tool holder at a fixed position with respect to the spindle; and a numerical controller which controls the tool exchanger so as to fit and remove the tool holder with respect to the spindle, and the numerical controller controls the spindle drive unit such that when the tool holder is fitted to the spindle, in a state where the key groove of the tool holder is inserted in the spindle key, the spindle is rotated to press the spindle key to the key groove so as to determine the phase of the tool holder with respect to the spindle.

Abstract: Provided is a chuck device that allows appropriate and easy setting of a discharging direction of working fluid. A chuck device configured to be attached to a spindle of a machine tool for gripping a cutting tool, in which inside the chuck device, there are provided a passage in which a working fluid flows and a discharge opening provided at a leading end opening of the passage through which the working fluid is discharged toward to the cutting tool. A discharging direction of the working fluid from the discharge opening is set opposite to a rotational direction of the cutting tool and set with a tilt of an angle calculated by a mathematical formula to a tangential direction of a rotation trajectory of the center of the discharge opening relative to a direction of an axis of the cutting tool.

Abstract: A position detecting device having a clamp body with a movable piston rod. A plurality of energy harvesting microswitches is mounted along a bottom of the piston rod using pin actuators to operate each microswitch depending on the piston rod position. The piston rod has a plurality of cutouts constructed and arranged to engage said pin actuators upon actuation of each microswitch, indicating a position which is transmitted wirelessly through the antenna. The antenna used to transmit a signal upon activation of a microswitch.

Abstract: A spindle nose for a machine tool spindle. The spindle nose has a longitudinal axis and a receiving end at which a conical receiving area opens. The receiving area tapers conically away from the receiving end in the direction of the longitudinal axis for receiving a tool shaft cone. A circumferential wall surrounds the receiving area and forms a circumferential contact edge. The contact edge has flat contact surfaces on which contact surfaces of the tool shaft cone rest when the tool is clamped in the tool spindle. The spindle nose defines blind receiving bores leading perpendicularly to the flat contact surfaces and which end below the flat contact surfaces. The contact edge is divided into at least four segments with the same angle. At least one receiving bore is formed in each of the segments. A sensor is arranged in each receiving bore.

Abstract: Provided is a servo controller that can prevent an unnecessary cut from being generated in a workpiece during oscillation machining. A servo controller 20 includes: an oscillation command generating unit 23 that generates an oscillation command for causing a workpiece W and a tool 11 to relatively oscillate; a position deviation estimating unit 31 that estimates an estimated position deviation from a moving command for causing the workpiece W and the tool 11 to relatively move; an adder that applies the oscillation command to a position deviation based on the moving command; a subtractor that deducts the estimated position deviation from a position deviation to which the oscillation command is applied; and a learning control unit that calculates a compensation amount from a position deviation based on the moving command after deducting the estimated position deviation.

Abstract: A polishing device for optical elements includes: a tool shank (1), and a polishing disc base; wherein the tool shank (1) is connected to the polishing disc base and is mounted on a tool shaft of a numerical-controlled processing device; wherein a polishing film (3) is stuck on the polishing disc base; the polishing disc base is a profiling polishing disc base (7), a cylinder polishing disc base (2), a profiling polishing disc base (12) or a spherical polishing disc base (8); wherein the tool shank (1) is independent and universal, thereby reducing the processing cost of the polishing device. A polishing method for optical elements is based on the shapes mentioned above of the polishing disc base, including steps of: fixing a polishing disc connecting rod (11); sticking a polishing film (3); trimming the polishing film (3); and polishing an unprocessed work piece (6).

Abstract: The present disclosure discloses a wheel burr removing device, consisting of a left brush system, a synchronous clamping drive system, a right brush system and the like. The wheel burr removing device can be used for removing burrs from a wheel center hole, the circumferential edge below the center hole, a bolt hole and a back cavity weight reduction pit, and at the same time, has the characteristics of high automation, high removal efficiency, advanced technology, strong universality and high safety and stability.

Abstract: A surface treating apparatus for treating an inner surface of a bore containing a shaft may include a body connectable to a drive apparatus and configured to movably receive a shaft extending through a bore, and at least one surface treating member connected to and movable with the body relative to the shaft, the at least one surface treating member sized to be inserted within an annular gap formed between the shaft and an inner surface of the bore and to bear against the inner surface of the bore when the shaft is received by the body.

Abstract: A polishing platform of a polishing apparatus includes a platen, a polishing pad, and an electric field element disposed between the platen and the polishing pad. The polishing apparatus further includes a controller configured to apply voltages to the electric field element. A first voltage is applied to the electric field element to attract charged particles of a polishing slurry toward the polishing pad. The attracted particles reduce overall topographic variation of a polishing surface presented to a workpiece for polishing. A second voltage is applied to the electric field element to attract additional charged particles of the polishing slurry toward the polishing pad. The additional attracted particles further reduce overall topographic variation of the polishing surface presented to the workpiece. A third voltage is applied to the electric field element to repel charged particles of the polishing slurry away from the polishing pad for improved cleaning thereof.

Abstract: The present disclosure relates to a chemical mechanical polishing (CMP) pad, and an associated method to perform a CMP process. In some embodiments, the CMP pad comprises a polishing layer having a front surface with protruding asperities while a back surface being planar. A film electrode is attached to the back surface of the polishing layer and is isolated from the front surface of the polishing layer. The CMP pad further comprises an insulating layer covering sidewall and bottom surfaces of the film electrode.

Abstract: A method for CMP is provided. The method includes the following operations. A semiconductor wafer is received. The semiconductor wafer is polished. In some embodiments, a residue is generated during polishing the semiconductor wafer and the residue attaches to a surface of a conditioning disk disposed on a dresser head. The dresser head and the conditioning disk are moved back and forth between a refuge position and a working region by the dresser arm during polishing the semiconductor wafer. The surface of the conditioning disk is scanned to remove the residue using a laser scanner when the dresser head and the conditioning disk are in refuge position.

Abstract: The present invention relates to a technical field of CMP pad manufacture, and more particularly to a CMP layer based on porous cerium oxide and a preparation method thereof. The CMP layer of the present invention is formed by mixing and curing a polyurethane prepolymer, a crosslinking agent and the porous cerium oxide, including steps of preheating the polyurethane prepolymer under vacuum, then adding a porous cerium oxide filler to the polyurethane prepolymer, and thoroughly mixing to obtain a mixed prepolymer; moving the mixed prepolymer to a first tank, and performing heat preservation, stirring, and circulation treatments; adding the crosslinking agent to a second tank and performing a melting treatment; correcting an injection weight ratio of the first tank and the second tank, then rapidly mixing, so as to inject into the mold; and then curing and vulcanizing to obtain the polishing layer.

Abstract: A method of fabricating a polishing pad using an additive manufacturing system includes dispensing a first plurality of first layers from a first plurality of successive layers by, for each respective first layer of the first plurality of first layers, ejecting droplets of polishing layer precursor into gaps between projections from a support to form the respective first layer, and curing the respective first layer before depositing a subsequent first layer, and dispensing a second plurality of layers from the first plurality of successive layers over the first plurality of layers by, for each respective second layer of the second plurality of layers, ejecting droplets of the polishing layer precursor to form the respective second layer, each respective second layer spanning the projections and the gaps, and curing the respective second layer before depositing a subsequent second layer, and removing the polishing layer from the support.

Abstract: An apparatus for chemical mechanical polishing includes a rotatable platen having a surface to support a polishing pad, a carrier head to hold a substrate in contact with the polishing pad, and a polishing liquid distribution system. The polishing liquid distribution system includes a dispenser positioned to deliver a polishing liquid to a portion of a polishing surface of the polishing pad, and a first barrier positioned before the portion of the polishing surface and configured to block used polishing liquid from reaching the portion of the polishing surface.

Abstract: The present invention relates generally to coated abrasive articles that include a blend of abrasive particles, an increased tear resistance, or combinations thereof, as well as methods of making and using said coated abrasive articles.

Abstract: A clamping apparatus is provided with: a metallic detector that is provided to a pivot shaft pivotally moving integrally with a clamp arm under the operation of a driving unit, in such a manner as to extend along the pivot shaft so as to be around the axis thereof; and one proximity sensor that is arranged so as to be opposed to the detector and that detects the magnetic loss of the detector. The detector is formed so that the area of a sensor opposing part opposed to a detection surface of the proximity sensor changes in association with the pivotal moving of the pivot shaft.

Abstract: This application relates to the field of reveal architectural panels and a tool or clamp for assembly thereof. The apparatus and method replace prior art assembly methods and fasteners with adhesives and a dedicated particularly designed clamp to facilitate assembly. The frame members are modified to facilitate assembly with adhesive sealants and removal of mechanical fasteners.

Abstract: Provided is a threaded member tightening tool capable of returning a count value in linkage with reverse driving by the threaded member tightening tool and only when a threaded member to be removed by the reverse driving has been counted as a tightened threaded member. A computing unit of a motor-driven screwdriver is switchable between a counting mode in which the computing unit counts the number of tightened threaded members and holds the counted number as a count value and a count return mode for returning the count value to a one-preceding count value. The computing unit returns the count value to a one-preceding count value based on the fact that the engaging element fitting unit has been driven in the reverse direction when the computing unit has been switched to the count return mode.

Abstract: A screw bit body which allows for efficient torque force application onto a socket fastener. The screw bit body includes a plurality of laterally-bracing sidewalls, a first base, and a second base. The laterally-bracing sidewalls are radially distributed about a rotation axis of the screw bit body with each further including a first lateral edge, a second lateral edge, a bracing surface, and an engagement cavity. The engagement cavity creates an additional gripping point to prevent slippage in between the screw bit body and the socket fastener. The engagement cavity traverses normal and into the bracing surface. Additionally, the engagement cavity traverses into the screw bit body from the first base to the second base. The engagement cavity is specifically positioned offset from the first lateral edge by a first distance.

Abstract: A power tool communication system including an external device including a first controller configured to transmit, via wireless communication to a power tool, configuration data including a work light duration parameter value and a work light brightness parameter value. The power tool includes a housing, a brushless direct current (DC) motor, a trigger, a work light, a wireless communication circuit configured to wirelessly communicate with the external device to receive the configuration data, and a second controller configured to control a work light duration of the work light based on the work light duration parameter value, and control a work light brightness of the work light based on the work light brightness parameter value.

Abstract: A tool for removing, from a set concrete wall, a concrete form of a type having a discontinuous structure is provided. The tool comprises a lever arm, comprising an engagement portion and a grasping portion. The engagement portion is positioned near one end of the lever arm, and the grasping portion is positioned near an opposite end of the lever arm. An engagement member is secured to the engagement portion. The engagement member is configured to engage the discontinuous structure. A pivoting member is mounted on the lever arm proximate the engagement portion. The pivoting member defines a pivot point around which the lever arm may rotate, whereby the engagement member will apply force to the discontinuous structure tending to pull the concrete form away from the set concrete wall when the engagement portion of the lever arm is pulled away from the set concrete wall when the engagement member is in engagement with the discontinuous structure.

Abstract: To provide a driver that can be reduced in the amount of gas to be injected into a pressure chamber. The driver has: an impactor configured to hit a stopper by moving from a first position toward a second position; a pressure chamber to be filled with gas for moving the impactor from the first position toward the second position; a control mechanism configured to move the impactor from the second position toward the first position; and a gas injection portion configured to inject gas into the pressure chamber, wherein the impactor is capable of taking a standby position between the second position and the first position, and the control mechanism is configured to stop the impactor at an adjustment position closer to the second position than the standby position before gas is injected into the pressure chamber.

Abstract: A staple gun and a method of using the same. A stapling mechanism in the housing is activated to deliver a staple through an aperture in a housing wall and drive the staple into a surface around a stack of one or more electric cables. The gun includes a reciprocating cable guide for centering the gun on the stack of cables and closing a safety switch to permit the gun's trigger to be activated. A spacer extending outwardly from the housing wall rests on the upper surface of the cable stack. The spacer and a bumper that engages a hammer of the stapling mechanism provide for automatic depth adjustment when driving the staple into the surface. A reciprocating cable guard extending outwardly from the housing wall is positioned between the stack of cables and the staple to aid in preventing the staple from piercing the cable.

Abstract: A binding member removal apparatus includes a removal unit that removes a binding member that binds a bound medium from the bound medium, an image capturing unit that captures an image in which a portion of the bound medium appears, a driving unit that moves the removal unit, and a control unit that controls the driving unit such that the removal unit is disposed at a predetermined position with respect to the binding member, on the basis of the image.

Abstract: A hammer has a claw assembly that is linearly moveable relative to the head of the hammer so as to improve leverage and range of prying for nail removal. A locking mechanism secures the claw assembly in a position. The locking mechanism may be automatic or manual, and may comprise a ratcheting mechanism with a pawl and rack, or a clamping mechanism with a deflectable sleeve and engaged bar, or a biased pin lock mechanism.

Abstract: A power tool including an impact tool, a body and an actuator. The actuator is operable to move the body along an operational axis from an impact position, at which the body is operable to transfer impact energy to a head end of the impact tool, to a retracted position spaced apart from the impact position along the operational axis.

Abstract: An impact driver includes a motor, a spindle rotated by the motor, a hammer that is movable forward and rearward with respect to the spindle and that has an inner peripheral portion facing the spindle, and an anvil struck in a rotational direction by the hammer. A grease supply path is provided to supply grease to the inner peripheral portion of the hammer.