Abstract: A power tool is provided including a housing including a motor case and a handle; an electric motor housed within the motor case and rotatably driving a motor spindle; a gear case mounted on the housing; and an output spindle rotatably coupled to the motor spindle. The output spindle, motor spindle, and the handle form the plane through the housing. A fan is coupled to the motor to generate an airflow through the housing. The housing includes a first air inlet on a first side of the plane and a second air inlet a second side of the plane opposite the first air inlet, both adjacent the motor. The first air inlet is larger than the second air inlet to allow a larger volume of air to enter the housing from the first side of the plane than from the second side of the plane.

Abstract: A diamond special-shaped grinding wheel includes an upper base body, a lower base body, and a grinding ring. The upper base body is disposed at the upper end of the lower base body, and the upper base body and the lower base body are fixedly connected to form a grinding wheel body. The grinding ring is fixed to an outer ring of the grinding wheel body; the grinding wheel body is internally provided with one or two annular grooves communicated with the upper end face of the grinding wheel body. A plurality of mixed flow channels is formed in the grinding ring. One end of each mixed flow channel extends to an annular grinding opening of the grinding ring, the other end is communicated with one annular groove, and the annular grooves are communicated with an external negative pressure air source device. Also disclosed is a vertical machining cooling system.

Abstract: An annular grindstone includes a grindstone portion in which abrasive grains are fixed with a bonding material containing nickel and has a through hole at the center thereof. The grindstone portion has a laminated structure of a total of three or more layers in which a first layer and a second layer having a porous structure are alternately laminated on top of another along a penetrating direction of the through hole and both of outermost layers in the laminated structure which are exposed outside are the first layers.

Abstract: The object of the present invention is to provide a grinding tool capable of continuing machining in a dry state and of being manufactured in a short time and at low cost, and a manufacturing method therefor. For said purpose, a grinding tool (10-1) for grinding a workpiece includes a threaded helical groove (12) formed on an outer circumferential surface of a cylindrical metal head portion (10b), ridgetop surfaces that result from the formation of the helical groove (12) and are formed so as to protrude with a trapezoidal cross-sectional shape, and abrasive grain surfaces (18) formed by winding an insulating resin rope in the helical groove (12) to mask the inside of the helical groove (12) and fixing abrasive grains on the ridgetop surfaces. A helix angle of the helical groove (12) with respect to an axial direction of the grinding tool (10-1) is set to be at least 80° and less than 90°.

Abstract: A grinding tool includes a substrate having a surface provided with a plurality of openings, and a plurality of grinding studs. Each of the grinding studs includes a stud portion and an abrasive particle attached to each other, the stud portions being respectively attached into the openings, and the abrasive particles protruding outward from the surface, each of the abrasive particles having a pattern cut across a tip thereof to define multiple apexes adjacent to one another.

Abstract: A disc-shaped grindstone 1 includes a plurality of split grindstones provided in an outer circumferential surface of a disc-shaped base 3. At least a part of the split grindstones include a moving grindstone 6 which is movable in the axial direction of the disc-shaped base 3. Since a part of the split grindstones 4 is the moving grindstone 6 which is movable in the axial direction, the width of the disc-shaped grindstone 1 may be changed in a manner such that the moving grindstone 6 is moved in the axial direction. Accordingly, it is possible to promptly handle a plurality of kinds of grinding targets without replacing the disc-shaped grindstone 1.

Abstract: A holding body includes a fastening layer which has a fastening surface configured to fasten a flexible grinding device. The fastening layer includes an air- and dust-permeable material and is substantially full-surface. The fastening layer includes a textile material. The holding body also includes a supporting body which has a supporting surface configured to support a holding surface of the fastening layer. The supporting body is air- and dust-permeable and includes an open-cell foam. A grinding system includes such a holding body and such a flexible grinding device.

Abstract: Disclosed is a grinding tool, which includes a first disk having an installation hole in a center portion thereof such that the grinding tool is installed on a grinder, a second disk forming a discharge passage with partitions on a bottom surface of the first disk, wherein air intaken from a central lower portion of the grinding tool is discharged to an outside thereof through the discharge passage, and a ring-shaped shank disposed under the second disk and including grinding tips to grind a target.

Abstract: A flow-bypassing structure and a grinding tool having the same are provided. A main body of the grinding tool has an intake passage and an exhaust passage. A cylinder is disposed in an interior of the main body and has an air inlet communicated with the intake passage and an air outlet communicated with the exhaust passage to form an airflow pathway. A rotor is disposed in the cylinder, and a rotational axle base is rotatably disposed though the cylinder and in a rotational cooperative relationship with the rotor. An end of the rotational axle base is extended and formed with a rotational working portion outside the cylinder. The surroundings of the rotational working portion define a space. A flow-bypassing passage is communicated with the airflow pathway and the space, and an end of the flow-bypassing passage is open toward the space.

Abstract: The present invention relates to a flow-bypassing structure and a grinding tool having the same. The main body has an intake passage and an exhaust passage. A cylinder is disposed in an interior of the main body and has an air inlet communicated with the intake passage and an air outlet communicated with the exhaust passage to form an airflow pathway. A rotor is disposed in the cylinder, and a rotational axle base is rotatably disposed though the cylinder and in a rotational cooperative relationship with the rotor. An end of the rotational axle base is extended and formed with a rotational working portion outside the cylinder. The surroundings of the rotational working portion define a space. A flow-bypassing passage is communicated with the airflow pathway and the space, and an end of the flow-bypassing passage is open toward the space.

Abstract: A retaining body for a grinding structure, in particular a grinding wheel, includes a fixing layer with a fixing surface. The fixing surface has a fixing structure configured to fix a flexible grinding structure, and includes a support body with a support surface. The support surface supports a fixing layer retaining surface that lies opposite the fixing surface, and is connected to the retaining surface. The support body is air- and dust-permeable, and includes an air- and dust-permeable material. The fixing layer is configured such that the fixing surface is substantially air- and dust-permeable in a direction that runs substantially perpendicular to the fixing surface, and such that an air flow can pass from the fixing surface through the fixing layer in a substantially perpendicular manner relative to the fixing surface.

Abstract: A cooling system and method for a machining process. The system includes a coolant supply and a coolant activation assembly, where the coolant supply is configured to provide coolant to the coolant activation assembly. The coolant activation assembly includes a plurality of piezoelectric actuators. Each of the plurality of piezoelectric actuators is configured to emit a coolant stream and to impart an ultrasonic or megasonic vibration component to each coolant stream. The coolant activation assembly is configured to provide cooling to a focal point in a work zone by directing multiple coolant streams emitted by the plurality of piezoelectric actuators to the focal point such that multiple coolant streams converge at the focal point.

Abstract: A machining device for machining crankshafts has a rotationally driven disk-shaped base body with blade inserts arranged peripherally thereon. A first supply line for a cryogenic cooling medium is arranged concentrically with the axis of rotation and is thermally insulated in at least some sections. The tool has a plurality of second supply lines for the cryogenic cooling medium running across the axis of rotation and leading to the blade inserts, the second supply lines each being thermally insulated in at least some sections. A distributor unit connects the first supply line to at least one of the second supply lines for supplying the cryogenic cooling medium to at least one of the blade inserts. The cryogenic cooling medium can be conducted directly to the blade inserts which are engaged with the crankshaft that is to be machined.

Abstract: A grinding wheel, including a base and a grinding ring disposed on the base. The grinding ring includes a grinding face including water outlets passing through the grinding ring. Each water outlet communicates with a corresponding water channel disposed inside the base and the water channels are connected to a water inlet. The number of the water outlets in an arc length on the grinding face is more than zero, where the arc length is between one and three times the contact line length between the grinding ring and a workpiece during grinding. The grinding face is a special-shaped grinding face comprising a non-entity processing region and an entity processing region. The water outlets are the non-entity processing region configured for washing, and a remaining part of the special-shaped grinding face is the entity processing region for grinding.

Abstract: A grinding tool includes a shank having an axis, and at least two abrasive portions mounted directly to and in contact with the shank without a hub therebetween. Each of the abrasive portions has a substantially identical profile formed therein.

Abstract: A cutting fluid control device for a machine tool is used to adjust the amounts of supply of a cutting fluid and water, thereby controlling the concentration of the cutting fluid in a cutting fluid tank, and comprises an operating unit which inputs a machining condition of the machine tool, a computing unit which calculates the concentration of the cutting fluid based on the machining condition input through the operating unit, and an adjustment unit which adjusts the amounts of supply from a cutting fluid undiluted-solution supply device and a water supply device so that the concentration of the cutting fluid in the cutting fluid tank is equal to the cutting fluid concentration calculated by the computing unit.

Abstract: A hand power tool includes a drive unit, an electronic unit, and a cooling device configured to cool at least one of the drive unit and the electronic unit. The hand power tool also includes at least one of an open-loop control unit and a closed-loop control unit configured to control the cooling device.

Abstract: A peripheral wheel for machining the edges of slabs, comprising an internal wheel body, to be fixed to a spindle or other machine, and an external abrasive ring, which is adapted to work in contact with an edge of a slab, the abrasive ring being composed of at least two portions that have respective abrasive surfaces having different abrasive capacities—one polishing with respect to the other; the portions of abrasive ring being juxtaposed with respect to each other with surfaces that extend at least partly transversely with respect to the axis of rotation of the peripheral wheel.

Abstract: A grinding wheel includes: a disc member; and an annular grindstone member fitted on an outer peripheral surface of the disc member, wherein the disc member has a fluid-supply hole formed therethrough from a first side surface to a second side surface thereof, wherein the fluid-supply hole has an outlet opening through an outer peripheral portion of the first side surface; and an inlet opening which is open through the second side surface and which is disposed at an inner position of the outlet opening in a radial direction of the disc member, and wherein the second side surface is formed with an outer peripheral wall which is disposed at an outer position of the inlet opening in a radial direction of the disc member and projects along an outer peripheral portion of the disc member.

Abstract: A grinding apparatus includes a base, a case, a transmission module, an inlet water module and drain module. The case is positioned on the base. The transmission module is positioned on the base, and includes a motor and a grinding plate. The motor drives the grinding plate to rotate. The inlet water module is configured for feeding water onto the grinding plates. The drain module includes a drain pan and a drain pipe. The drain pan is detachably attached to the case, the drain pipe is connected to the drain pan, and is exposed from the case.

Abstract: A system for grinding surgical needles made of refractory metal alloys such as tungsten-rhenium alloys includes a rotatable grinding wheel having a grinding surface, a layer of a binding material, such as a nickel binding material layer, overlying the grinding surface, and a plurality of abrasive particles, such as ABN600 abrasive particles, embedded within the binding material layer. The abrasive particles are similarly sized and the binding material layer has a thickness that is about 65% of the size of the similarly sized abrasive particles. The system includes a lubricating device adapted to apply a lubricant to an interface between the grinding surface and distal ends of needle blanks and a rotating element coupled with the rotatable wheel for rotating the grinding surface at about 10,000 surface feet per minute.

Abstract: A polishing pad of a polishing system is mountable to a polishing plate and has a predetermined channel pattern so as to allow a polishing liquid supplied from a polishing liquid supplier to move on a polishing surface. The channel pattern has at least two kinds of patterns.

Abstract: A tool assembly for machining a bore. The tool assembly includes a cutting tool and a tool holder. The cutting tool has an abrasive grit disposed continuously around a circumference of the cutting tool. The tool holder has a first coolant passage and a secondary coolant passage that extends at an angle from the first coolant passage.

Abstract: A machining method comprises selecting a finished surface dimension and a material property for a working surface, defining a working temperature range based on the selected material property, and defining a machining power based on the working temperature range. The machining power depends on a removal rate and a specific heat of the working surface. The working surface is machined at the removal rate to achieve the finished surface dimension, and the machine power is controlled to maintain the working surface within the working temperature range. The working surface is heated or cooled from the working temperature range to a transition temperature range, such that the selected material property is preserved in the working surface.

Abstract: A grinding wheel includes: a disc member; and an annular grindstone member fitted on an outer peripheral surface of the disc member, wherein the disc member has a fluid-supply hole formed therethrough from a first side surface to a second side surface thereof, wherein the fluid-supply hole has an outlet opening through an outer peripheral portion of the first side surface; and an inlet opening which is open through the second side surface and which is disposed at an inner position of the outlet opening in a radial direction of the disc member, and wherein the second side surface is formed with an outer peripheral wall which is disposed at an outer position of the inlet opening in a radial direction of the disc member and projects along an outer peripheral portion of the disc member.

Abstract: A holding body includes a fastening layer which has a fastening surface configured to fasten a flexible grinding device. The fastening layer includes an air- and dust-permeable material and is substantially full-surface. The fastening layer includes a textile material. The holding body also includes a supporting body which has a supporting surface configured to support a holding surface of the fastening layer. The supporting body is air- and dust-permeable and includes an open-cell foam. A grinding system includes such a holding body and such a flexible grinding device.

Abstract: A structural unit, in particular a grinding wheel has a hole pattern for sucking away swarf from a machining surface. The hole pattern has at least three recesses which are arranged essentially along a first spiral line. The hole pattern also has at least three further recesses which are arranged essentially along a second spiral line which intersects the first spiral line in a region of at least one recess.

Abstract: A polishing pad of a polishing system is mountable to a polishing plate and has a predetermined channel pattern so as to allow a polishing liquid supplied from a polishing liquid supplier to move on a polishing surface. The channel pattern has at least two kinds of patterns.

Abstract: A fluid discharge method and apparatus is provided. The fluid discharge apparatus includes a first structure defining a first duct therein, a second structure defining a second duct therein and a third structure defining a third duct therein. Conduits formed in the structures, accurately positioned during machining thereof, extend from openings towards the ducts. Fluid in the ducts is initially directed into the conduits and subsequently out of the openings towards a cutting area comprising portions of a cutting blade and a workpiece being processed by the cutting blade. The conduits are shaped for generating a nozzle-type flow therethrough for accurate directional control of fluid streams discharged from the conduits. A method of forming the fluid discharge apparatus is also provided.

Abstract: A battery-operated hand-held power tool (2), especially an angle grinder, comprises a housing base (4) accommodating the electromotive drive components and air inlet openings (10) supplying the electromotive drive components with a cooling air flow. In order to protect the electromotive components from dirt, the hand-held power tool is designed in such a manner that a filter element (20) is provided in the area of the air inlet openings (10) and keeps dust, especially magnetizable dust, away from the electromotive drive components. The filter element (20) is retained by a filter retaining part (12, 30) which can be attached to the exterior of the housing base (4). The filter retaining part (14, 30) can be elastically deformed to such an extent that it is slightly deformed, especially expanded, when attached to the housing base, and engages behind or snaps into an element on the housing base.

Abstract: Disclosed is a grinding tool, which includes a first disk having an installation hole in a center portion thereof such that the grinding tool is installed on a grinder, a second disk forming a discharge passage with partitions on a bottom surface of the first disk, wherein air intaken from a central lower portion of the grinding tool is discharged to an outside thereof through the discharge passage, and a ring-shaped shank disposed under the second disk and including grinding tips to grind a target.

Abstract: A grinder with built-in grinding agent dispenser includes a driving shank having an adapter end for operatively coupling with a grinder machine for being driven to rotate, a grinding shaft operatively coupling with the driving shank for being driven to rotate, an abrasive arrangement provided at the grinding shaft for refining a surface of a workpiece, and a grinding agent dispenser built-in within the grinder for guiding a flow of grinding agent. The dispenser has a supplying channel connected to a supplying inlet, and a grinding channel connected to a dispensing outlet and communicatively connected to the supplying channel, wherein the supplying channel and the grinding channel are provided within the driving shank and the grinding shaft, so that when the grinding agent is feeding into the supplying channel via the supplying inlet, the grinding agent is guided to flow to the dispensing outlet, so as to disperse grinding agent.

Abstract: The present invention is directed to an airflow generation and particle dispersion arrangement for a power tool (e.g., an angle grinder). The arrangement includes a motor, an airflow generation assembly, and a particle dispersion assembly. The airflow generation assembly includes a fan driven by the motor. When engaged, the driven fan generates an airstream that is drawn through the power tool. The particle dispersion assembly includes a passive fan that is not driven by the motor, but instead is driven by the airstream. In operation, the passive fan generates centrifugal and mechanical forces sufficient to remove particles from intake air passing through the particle dispersion assembly.

Abstract: The present invention is directed to an airflow generation and particle dispersion arrangement for a power tool (e.g., an angle grinder). The arrangement includes a motor, an airflow generation assembly, and a particle dispersion assembly. The airflow generation assembly includes a fan driven by the motor. When engaged, the driven fan generates an airstream that is drawn through the power tool. The particle dispersion assembly includes a passive fan that is not driven by the motor, but instead is driven by the airstream. In operation, the passive fan generates centrifugal and mechanical forces sufficient to remove particles from intake air passing through the particle dispersion assembly.

Abstract: The super abrasive wheel includes a core rotating around a rotation axis and a super abrasive layer bonded to the core. The core has a first surface and a second surface located opposite to the first surface. An annular first protrusion portion protruding in the direction away from the first surface is provided at a portion of the second surface that is surrounded with the super abrasive layer. A reference surface is provided in the second surface on the inside of the first protrusion portion. The height from the reference surface to the first protrusion portion is denoted as A. A top portion having the height B from the reference surface is provided at a portion of the second surface between the first protrusion portion and the super abrasive layer. The height B is greater than the height A.

Abstract: In a method for multiple cutoff machining a rare earth magnet block, a cutting fluid feed nozzle having a plurality of slits is combined with a plurality of cutoff abrasive blades coaxially mounted on a rotating shaft, each said blade comprising a base disk and a peripheral cutting part. The slits in the feed nozzle into which the outer peripheral portions of cutoff abrasive blades are inserted serve to restrict any axial run-out of the cutoff abrasive blades during rotation. Cutting fluid is fed from the feed nozzle through slits to the rotating cutoff abrasive blades and eventually to points of cutoff machining on the magnet block.

Abstract: A back-up apparatus for use with a surface treating apparatus can include a back-up plate having a pad attachment face and a back-up pad having a first pad face and a second pad face. The back-up apparatus can also include a porous interface layer. The interface layer can include an outer face. The back-up apparatus can also include a layer of a first adhesive on the outer face and extending into the interface layer, and a layer of a second adhesive provided on the layer of the first adhesive. The second adhesive can be selected to releasably adhesively bond to an abrasive sheet. The first and second adhesives can be selected such that the adhesive bond between the first adhesive and the second adhesive is stronger than the adhesive bond between the second adhesive and the abrasive sheet.

Abstract: An angle grinder is provided including a trigger assembly for selectively actuating the angle grinder. A particle separation assembly is provided for the removal of any dust, particle, or artifacts that may have entered into the housing of the angle grinder. A brush biasing system is also provided to ensure proper and efficient operation of the motor of the angle grinder. An overload monitoring system is included to monitor the loading on the motor. A clutch mechanism is also included to prevent overloading on the motor of the angle grinder. A gear wheel lock mechanism is also provided to prevent the wheel spindle from rotating during installation or removal of a grinding wheel on the wheel spindle. An anti-locking flange system is also included to prevent the over-tightening of the flanges and the grinder wheel during the operation of the angle grinder. A gear case labyrinth feature is also provided.

Abstract: An abrasive disc for a multiple disc grinding machine is described, including a disc-shaped support having a circumferential rim on which the abrasive material is placed and an opposing central hole for fitting on to a driving shaft of the grinding machine, said hole extending through the thickness of the disc-shaped support, in which a portion of said central hole has a diameter greater than the diameter of the connection to said shaft, such that an annular chamber is formed in the thickness of the support. The further disc includes at least one radial recess formed on a front surface of the disc-shaped support and extending from said annular chamber towards the circumferential rim of said disc, in such a way that a coolant fluid fed into the driving shaft can accumulate in said annular chamber and can then flow through said radial recess towards the abrasive edge of said disc.

Abstract: A machine tool with a heat conduction structure comprises a machine tool and a heat dissipation seat installed on the machine tool. The machine tool has a handle. The handle has an accommodation space accommodating a circuit board and having an opening at one end. The heat dissipation seat has a heat dissipation member arranged on the opening and a carrying member connected with the heat dissipation member and extended to the accommodation space. The carrying member carries the circuit board, contacts heat sources of the circuit board, and conducts heat to the heat dissipation member. As the machine tool is exempted from forming heat dissipation holes on the handle, the present invention can effectively prevent dust from entering the handle and damaging the circuit board. Further, the present invention can dissipate heat generated by the circuit board and maintain normal operation of the circuit board and the machine tool.

Abstract: A dynamic pressure in the coolant supplied between a rotating grinding wheel and a rotating workpiece is released by making at least one of oblique grooves on the grinding wheel pass vertically through a contact surface on which a grinding surface of the grinding wheel contacts the workpiece. Where one and the other side intersection points are defined as intersection points at which both ends of each oblique groove respectively cross extension lines of one and the other side edges parallel to a grinding wheel circumferential direction of the contact surface, the other side intersection point of each oblique groove overlaps the one side intersection point of an oblique groove next to each such oblique groove by a predetermined overlap amount in the grinding wheel circumferential direction, and the length in the grinding wheel circumferential direction of the contact surface is made to be shorter than the overlap amount.

Abstract: A device for abrasive machining, comprising a substantially cup shaped to rough rotatable around an axis and having an inner chamber and a disk-shaped to working element at its one axial end; and immovable holder attachable to a machine to and surrounding at least a portion of said working element at an opposite axial end at a distance therebetween so as to form a passage for passing a cooling liquid; and a helical guiding means provided in said passage so that during rotation of said tool inside said holder the cooling liquid is supplied through the substantially helical guide into said inner chamber of said tool toward said working element.

Abstract: The invention relates to a machine tool, particularly a hand machine tool, which comprises a driving motor and an air guide element, which is disposed in the housing of the machine tool and conducts an air current passing over the driving motor to the outside. The air guide element comprises a functional section, which forms a part of the outer lateral surface of the machine tool.

Abstract: Simultaneous double-side grinding of a plurality of semiconductor wafers involves positioning each wafer freely in a cutout of one of plural carriers which rotate on a cycloidal trajectory, wherein the wafers are machined between two rotating ring-shaped working disks, each disk having a working layer of bonded abrasive, wherein the form of the working gap between working layers is determined during grinding and the form of the working area of at least one disk is altered such that the gap has a predetermined form. The wafers, during machining, may temporarily overhang the gap. The carrier is optionally composed only of a first material, or is completely or partly coated with the first material such that during machining only the first material contacts the working layer, and the first material does not reduce the machining ability of the working layer.

Abstract: A method for operating a machining tool, comprising: setting a flow rate and a pressure of a flow of coolant to a flow rate target and a pressure target, respectively, the coolant flow being provided to the machining tool; machining a work-piece using the machining tool; measuring the flow rate and the pressure of the flow of coolant; and detecting an anomaly with respect to the coolant flow; and taking a corrective action depending on the type of the detected anomaly.

Abstract: An angle grinder is provided including a trigger assembly for selectively actuating the angle grinder. A particle separation assembly is provided for the removal of any dust, particle, or artifacts that may have entered into the housing of the angle grinder. A brush biasing system is also provided to ensure proper and efficient operation of the motor of the angle grinder. An overload monitoring system is included to monitor the loading on the motor. A clutch mechanism is also included to prevent overloading on the motor of the angle grinder. A gear wheel lock mechanism is also provided to prevent the wheel spindle from rotating during installation or removal of a grinding wheel on the wheel spindle. An anti-locking flange system is also included to prevent the over-tightening of the flanges and the grinder wheel during the operation of the angle grinder. A gear case labyrinth feature is also provided.

Abstract: The present invention relates to a method and a system for manufacturing wafer-like slices from a body of a substrate material, especially for use in the manufacture of semiconductor devices. The method comprises providing a slicing device with a cutting wire equipped on its surface with abrasive particles; providing an aqueous cooling and lubricating fluid, said fluid having an ionic strength corresponding to an electrical conductivity of about 30 IJS/cm or less; cutting said body with said cutting wire into slices while dispensing said cooling and lubricating fluid into a kerf area where said cutting wire contacts and cuts said body, said cooling and lubricating fluid promoting removal of powdered substrate material from said kerf area resulting in spent fluid; and removing said spent fluid from said cutting device and recovering said powdered substrate material from said spent fluid.

Abstract: A mount is disclosed for mounting a blade on a rotary spindle of a power tool. The spindle has an axial bore through which a cooling fluid may flow. The mount includes a disk configured for directing cooling fluid outward in a generally radial direction with respect to the axis of spindle when the blade is mounted face-to-face with an outer face of the disk. An adapter is also disclosed that can be used with a conventional blade mount for achieving the same result.

Abstract: An angle grinder is provided including a radial fan assembly. The radial fan assembly is configured to direct exhaust radially outwardly and axially away from a user of the angle grinder. Brush card assemblies for an angle grinder are also provided. The brush card assemblies provide for the securing of brush cards to a field case of the angle grinder by the interface between the field case and brush cards. Additionally, a spindle lock mechanism and a safety mechanism for an angle grinder are provided.

Abstract: A heat dissipating architecture for a machine tool is provided. The machine tool includes an accommodating space, a tool shaft mounted in the accommodating space, a counter balancing mass having a first balancing portion and a second balancing portion mounted on the tool shaft for causing an eccentric rotation stroke of the tool shaft, and an inlet communicating with the accommodating space. The heat sink is mounted on the counter balancing mass. The heat sink includes a first blade portion corresponding to the first balancing portion, a second blade portion corresponding to the second balancing portion, and a linking portion for connecting the first and second blade portions, such that during the rotation stroke of the tool shaft, the heat sink inhales air via the inlet, transmit the air from the first blade portion to the second blade portion, and then exhausts the air from the second blade portion.