Abstract: A multifunction work apparatus includes a drawing and yielding assembly and at least one of either a wire guide assembly, a straightening assembly, or a finishing assembly. The drawing and yielding assembly includes a contrast roll, rotatable idly around its axis of rotation, and at least two motorized rolls positioned on the periphery of said contrast roll.

Abstract: The present invention provides a hot-stamping formed article made of steel, in which the hot-stamping formed article has at least one of a tensile strength of 1200 MPa or more and a martensitic steel structure and includes a first portion, a corner portion, and a second portion, which are sequentially continuous from one end portion to the other end portion in a longitudinal direction, each of the first portion, the corner portion, and the second portion includes a top sheet and two vertical walls connected to the top sheet when viewed in a cross section perpendicular to the longitudinal direction, the second portion includes a first outwardly-extending flange adjacent to the vertical wall, and the corner portion includes a vertical flange extending from the vertical wall of the first portion, a second outwardly-extending flange adjacent to the vertical wall located on an outer peripheral side of the corner portion out of the two vertical walls, and a transition portion in which the vertical flange and the se

Abstract: This press forming method includes a first drawing step for forming a first drawn step portion, a second drawing step for forming a second drawn step portion, and a finishing step for completing a stepped portion. In the first drawing step, a first outside curved portion is formed to the outside of a second outside curved portion with respect to an extension region of a character line, and a first parallel portion is formed to the same depth as the drawn depth of a second parallel portion. In the second drawing step, a second inside curved portion having a greater curvature than a first inside curved portion is formed.

Abstract: The present invention provides a method of explosively forming a helical tube from at least one thin-walled cylinder using a tooling assembly. The method includes inserting the at least one thin-walled cylinder into a die of the tooling assembly. The die surrounds the at least one thin-walled cylinder and includes an interior surface that defines a helical thread pattern. The method further includes surrounding the at least one thin-walled cylinder and the die with a casing of the tooling assembly. A cavity is defined by the casing and the thin-walled cylinder. The method further includes positioning an explosive charge within the cavity. The method additionally includes at least partially submerging the tooling assembly. The method further includes detonating the explosive charge. As a result, the at least one thin-walled cylinder is formed into a helical tube that corresponds with helical thread pattern of the interior surface of the die.

Abstract: A method includes press forming a metal sheet into an intermediate formed product bent out of a plane and forming into a desired press-formed component shape. In a region to be a flange portion, an angle to be bent out of the plane is equal to or less than an angle formed by the flange portion at the curved portion in the press-formed component shape. The projection portion has a largest projection height at the center portion in the longitudinal direction of the region to be the curved portion as seen in the side view, and a longitudinal length of a region to be the top sheet portion is set to coincide with or approach a longitudinal length of the top sheet portion in the press-formed component shape.

Abstract: A vehicle assembly includes a first component having a stand-off that provides a cavity. The stand-off protrudes from an insertion side of the first component. The stand-off includes at least one side wall that extends from a floor of the cavity to at least one outer surface of the stand-off. The assembly further includes a second component that contacts the first component at an interface. The cavity is configured to receive a mechanical fastener that joins the first component to the second component. A distance between the floor of the cavity and the interface is greater in some areas than in other areas such that a cross-sectional thickness at a bottom of the cavity is varied.

Abstract: A method for manufacturing an operation rod of a wrench assembly for disassembling a fan clutch, including following steps of: preparing a rod material; fixing the rod material on a forging mold; carrying out a forging process to produce a semi-finished head; carrying out a cutout process, cutting the remainder structure out of the semi-finished head; obtaining a finished product of a head portion, the head portion including two wing plates and a shaft which are integrally formed.

Abstract: A core shooting machine (1) for producing cores by a process of shooting a core sand mixture (21) into at least one cavity (19) in a core box (18), the core shooting machine (1) having a source of compressed air (10) at an adjustable initial machine pressure (P0), a shooting head (13) fluidically coupled to the source of compressed air (10) by at least one conduit (12) that includes an electronically controlled shot valve (11), the shooting head (13) being configured for containing an amount of the core sand mixture (21), resulting in a filling degree of the shooting head (13), and a computing device (50,60) associated with the core shooting machine (1) and being configured to perform a simulation of the process.

Abstract: A mold molding apparatus can successively mold casting molds having the necessary casting mold strength, and a method for controlling the mold molding apparatus. A molding sensor measures a pressure of molding sand exerted on a surface of one or both of a pattern plate and a squeeze foot, or on a surface of one or both of a pattern plate and a squeeze board; and a control device that controls operation of the mold molding apparatus based on outputs from the molding sensors.

Abstract: The present invention provides a copper billet horizontal continuous casting apparatus with a vertical shaft furnace for smelting and a corresponding process. The copper billet horizontal continuous casting apparatus with a vertical shaft furnace for smelting includes: a vertical shaft, a refining furnace, a mixing furnace, a holding furnace, and a continuous casting furnace; wherein the refining furnace includes a furnace body, and a gas flushing device disposed beneath the furnace body, a gas flushing brick is provided at the chamber bottom wall of the furnace body; a gas inlet device is provided on the vertical shaft furnace; the vertical shaft furnace further includes a detecting device and an adjusting device which are connected with the air inlet device.

Abstract: The present invention relates to a core for hollow product manufacture including a multilayer filling material, which may be used in forming a cooling water circulation channel through which a fluid such as cooling water may pass, and a method of manufacturing a hollow product using the core, and the core includes a pipe, having a hollow formed in the pipe and an opening formed at both ends of the pipe so that the hollow is exposed to the outside through the opening, a first support member, being disposed inside the hollow and having a space formed in the first support member, a second support member, being disposed in the space, and a melting bar, passing through the second support member in a longitudinal direction of the melting bar, wherein the melting bar melts and forms a space in the second support member when the melting bar is heated.

Abstract: Metallic alloys and methods for the preparation of free-standing metallic materials in a layerwise manner. The resulting layerwise construction provides a metallic skeleton of selected porosity which may be infiltrated with a second metal to provide a free-standing material that has a volume loss of less than or equal to 130 mm3 as measured according to ASTM G65-04 (2010).

Abstract: A composition including a three-dimensional metal printing powder; an organic polymeric additive on at least a portion of an external surface of the three-dimensional metal printing powder; and optionally, an inorganic additive on at least a portion of an external surface of the three-dimensional metal printing powder. A process for preparing a three-dimensional metal printing powder having an organic polymeric additive disposed thereon. A process for employing the three-dimensional metal printing powder including selective laser sintering.

Abstract: The present application provides a method for manufacturing a metal foam. The present application can provide a method for manufacturing a metal foam, which is capable of forming a metal foam comprising uniformly formed pores and having excellent mechanical properties as well as the desired porosity, and a metal foam having the above characteristics. In addition, the present application can provide a method capable of forming a metal foam in which the above-mentioned physical properties are ensured, while being in the form of a thin film or sheet, within a fast process time, and such a metal foam.

Abstract: Disclosed are a method of manufacturing an aluminum-based clad heat sink, and an aluminum-based clad heat sink manufactured by the method. The method includes ball-milling (i) aluminum or aluminum alloy powder and (ii) carbon nanotubes (CNT) to prepare a composite powder, preparing a multi-layered billet using the composite billet, and directly extruding the multi-layered billet using an extrusion die to produce a heat sink. The method has an advantage of producing a light high-strength high-conductivity aluminum-based clad heat sink having an competitive advantage in terms of price by using direct extrusion that is suitable for mass production due to its simplicity in process procedure and equipment required.

Abstract: A method for manufacturing a foam in a conduit comprises extruding a metal conduit. A metal foam powder is injected into a cavity of the metal conduit. The metal foam powder is activated to form a metal foam in the cavity of the metal conduit. A device for producing a foamed metal comprises an extruder that comprises one or more screws for extruding a metal through a die to form a conduit. The die comprises a plurality of ports for injecting a metal foam powder into a central hollow cavity or a wall cavity of the conduit. The device comprises a pressurizing section for increasing pressure on the metal foam powder and a thermal section for increasing the temperature of the metal foam powder to facilitate its expansion into a metal foam.

Abstract: A substrate holder for a lithographic apparatus has a main body having a thin-film stack provided on a surface thereof. The thin-film stack forms an electronic or electric component such as an electrode, a sensor, a heater, a transistor or a logic device, and has a top isolation layer. A plurality of burls to support a substrate are formed on the thin-film stack or in apertures of the thin-film stack.

Abstract: Implementations provide gas atomized metal matrix composite (“GAMMC”)-based feedstock for cold spray additive manufacturing (“CSAM”) enabling complex structural repairs. The feedstock is prepared by arranging a metal matrix composite (MMC) material in a gas atomization system, wherein the MMC material includes metal particles and ceramic particles. The feedstock is further prepared by performing gas atomization of the MMC material using the gas atomization system to atomize the MMC material, and producing a feedstock powder comprised of metal particles that are embedded with the ceramic particles from the atomized MMC material. The GAMMC-based feedstock comprises metallic (for binding to the substrate of the damaged part) and ceramic (for reinforcement) particles bonded together such that the ceramic particles bond directly to and within the metallic particles.

Abstract: A metal powder producing apparatus comprising a melted metal supplying part discharging a melted metal, a cylinder body provided below the melted metal supplying part, and a cooling liquid layer forming part forming a flow of a cooling liquid for cooling the melted metal discharged from the melted metal supplying part along an inner circumference face of the cylinder body, wherein the cooling liquid layer forming part has a primary pressure reservoir, and the primary pressure reservoir is provided on an outer circumference part of the cylinder body.

Abstract: Composite particles sinterable at a low temperature and allow forming a sintered body that exhibits a large extension are provided. The composite particles include microparticles having an average crystallite diameter of 0.6 to 10 ?m and containing a metal, and nanoparticles adhered to a surface of the microparticle, having an average crystallite diameter of 3 to 100 nm, and containing a metal of a same kind as the metal contained in the microparticle.

Abstract: A method of feedback controlling a 3D printing process in real time, and a system therefor are disclosed. The method includes collecting big data, generated through 3D printing experiments, related to process variables of 3D printing, measurement signals, and 3D printing quality of the 3D printing object; building an artificial neural network model by performing machine-learning based on the collected big data; evaluating whether or not a 3D printing quality of the 3D printing object is abnormal in real time based on an actual measurement signal of the 3D printing object and the artificial neural network model; and feedback controlling printing quality of the 3D printing object in real time based on the evaluation result of whether or not the 3D printing quality of the 3D printing object is abnormal.

Abstract: A coated cutting tool having a substrate and a coating is provided. The coating includes an inner ?-Al2O3-multilayer and an outer ?-Al2O3-single-layer. The thickness of the inner ?-Al2O3-multilayer is less than or equal to 35% of the sum of the thickness of the inner ?-Al2O3-multilayer and the thickness of the outer ?-Al2O3-single-layer. The sum of the thickness of the inner ?-Al2O3-multilayer and the outer ?-Al2O3-single-layer is 2-15 ?m. The inner ?-Al2O3-multilayer consists of alternating sublayers of ?-Al2O3 and sublayers of TiCO, TiCNO, AlTiCO or AlTiCNO. The inner ?-Al2O3-multilayer can include at least 5 sublayers of ?-Al2O3.

Abstract: A cutting insert may include a first surface, a second surface and a third surface. The first surface may include a corner having a convex curvilinear shape and an inclined surface. The inclined surface may include a first inclined surface, a second inclined surface and a third inclined surface. The first inclined surface may be inclined at a first angle. The second inclined surface may be inclined at a second angle. The third inclined surface may be inclined at a third angle. The first inclined surface may have a concave curvilinear shape in a cross section orthogonal to a bisector of the corner. The second inclined surface may be a flat surface. The second angle may be smaller than either of the first angle and the third angle in a cross section which includes the bisector and is orthogonal to the reference plane.

Abstract: A drilling tool is provided, which is configured to prevent an insufficient chip discharge ability thereof. The drilling tool includes a cutting insert having a cutting edge at a leading end portion, and a body to which the cutting insert is mounted. The drilling tool also includes a recessed part provided on an outer peripheral surface of the body and extending to a leading end of the body, and an oil supply port provided on a base end side of the recessed part and supplying cutting oil, passing through the inside of the body, to an outer peripheral side of the body. In a case where the drilling tool further includes a guide pad that comes into abutment with an inner wall surface of a hole cut by the cutting insert, and a fastening screw for fixing the guide pad to the body, the oil supply port may be provided at a position further toward the base end side of the body than a position of the fastening screw.

Abstract: The invention relates to a ring-shaped tool for processing a workpiece, wherein the tool has a fastening region which is centred with its ring shape for fastening to a rotatable drive shaft, wherein the tool has cutting teeth and the teeth extend on both sides of the tool in each case from the head region of the tool in the direction of the fastening region, the teeth on one side having a right-hand twist and providing right-hand cutting, and the teeth on the other side having a right-hand twist and providing left-hand cutting.

Abstract: Fastening collar removal apparatus, methods of making fastening collar removal apparatus, and methods of removing a fastening collar secured to a fastener are provided. A fastening collar removal apparatus includes a collet including a first section including a substantially cylindrical shape and a second section operatively coupled to the first section. The second section includes a collet cavity extending therein. The collet cavity is configured to receive at least a portion of a collar. The second section includes at least two fingers formed by at least two axial channels in the second section. At least one of the at least two fingers includes a blade extending inwardly relative to a longitudinal axis of the collet. In an open configuration of the collet, each of the at least two fingers includes an outward taper relative to a longitudinal axis of the collet.

Abstract: A reciprocating cutting tool is provided, wherein the tool has a reciprocating saw mode and a jig saw mode. The tool includes a reciprocating mechanism; an actuating mechanism and a cutter-lifting mechanism. The reciprocating mechanism includes a reciprocating rod and the cutter-lifting mechanism includes an actuating member and a pushing member. The actuating member includes a first engaging portion and a second engaging portion when the reciprocating rod is driven to perform a reciprocating motion, the reciprocating rod drives the pushing member to deflect close to the first engaging portion or second engaging portion; when the first engaging portion or the second engaging portion is driven to move close to the pushing member, the first engaging portion or second engaging portion pushes the pushing member towards the side which the first engaging portion or the second engaging portion deflects to force the reciprocating rod to implement a cutter-lifting motion.

Abstract: A saw chain includes connecting links and drive links that are mutually connected by rivets in an articulated manner about rivet axes. The rivets project through at least one rivet opening of one connecting link and through a rivet opening of a drive link. At least one rivet has, on one end face thereof, a depression having a depression edge and a depression base surrounded by the depression edge. The distance of the depression edge from a central plane of the saw chain increases at an increasing radial distance from the rivet axis. The distance (e) of the base from the central plane does not increase at any point of the base at an increasing radial distance from the rivet axis. A greatest distance (a) of the base from the rivet axis corresponds to 50% to 100% of half the core diameter (d) of the rivet.

Abstract: A solder device includes a light source, a solder module, an optical guiding assembly, a sensor and a feedback controller. The light source emits waveband light guided to a to-be-soldered area for heating. The optical guiding assembly is disposed between the light source and the solder module, and the waveband light is guided to the solder module by the optical guiding assembly. The sensor is disposed on another side of the optical guiding assembly for receiving a sensing light beam and then generating a sensing signal. The sensing light beam is guided to the sensor by the optical guiding assembly. The feedback controller is connected with the sensor and the light source for receiving the sensing signal and then controlling the light source. The optical guiding assembly, the sensor and the feedback controller are integrated as a system controller. Therefore, the volume and weight of the solder module are compacted.

Abstract: Art for spot welding able to suppress penetration of hydrogen, one of the factors behind delayed fracture, at the time of spot welding, that is, a spot welding method in which at one or both of the surfaces of the steel sheets becoming the facing surfaces of the overlaid steel sheets, a location where the steel sheets contact each other to form a contact part at the time of initial squeezing of the spot welding is worked in advance to form a plurality of lines running through the contact part and connected to the outside of the contact part and the spot welding is performed at the location of the contact part and also a steel sheet in which the plurality of lines are formed in advance at the location becoming a contact part when steel sheets contact each other at the time of initial squeezing in the spot welding.

Abstract: Disclosed is a clad steel plate with further improved low temperature toughness along with excellent HIC resistance while ensuring a tensile strength of 535 MPa or more. A clad steel plate includes: a base steel; and a clad metal made of a corrosion resistant alloy bonded to one surface of the base steel, in which the base steel has: a chemical composition with appropriately controlled values of ACR and PHIC; and a steel microstructure in which bainite is present in an area fraction of 94% or more at a ½ thickness position in a thickness direction of the base steel, and with an average crystal grain size of 25 ?m or less, and shear strength at a bonded interface between the base steel and the cladding metal is 300 MPa or more.

Abstract: An embodiment relates to an ultrasonic additive manufacturing process, comprising joining a foil comprising a bulk metallic glass to a substrate; and forming a cladded composite comprising the foil and the substrate; wherein a thickness of the cladded composite is greater than a critical casting thickness of the bulk metallic glass, wherein the cladded composite comprises a cladding layer of the bulk metallic glass on the substrate and the bulk metallic glass comprises approximately 0% crystallinity, approximately 0% porosity, less than 50 MPa thermal stress, approximately 0% distortion, approximately 0 inch heat affected zone, approximately 0% dilution, and a strength of about 2,000-3,500 MPa.

Abstract: A method of joining a first component to a second component at respective connection surfaces, comprising, in order, applying a local surface treatment to the connection surface of at least one of the first and second components in order to locally alter the microstructure to a depth of between 60 ?m and 10 mm below the connection surface; and joining the first component to the second component using a welding process.

Abstract: A processing apparatus includes a chuck table for sucking and holding a workpiece and a camera unit imaging the workpiece. The chuck table includes a light passing portion that passes light. The light passing portion includes a first region that overlaps with the workpiece and has a first mirror face that reflects light that advances from the first region into the light passing portion. The camera unit can image the workpiece by detecting light reflected by the first mirror face after having been reflected by the workpiece held by the chuck table and advanced into the light passing portion.

Abstract: Provided is a welding method enabling enhancement of quality of welding between an upper plate and a lower plate. One aspect of the present disclosure is the welding method including welding the upper plate and the lower plate overlapped with the upper plate by irradiating a surface of the upper plate with a laser beam. The welding includes: forming an auxiliary welding path that is continuous and includes a reciprocating or circling path; and forming a main welding path that intersects a welding advancing direction and that includes turning points, after formation of the auxiliary welding path.

Abstract: A three-dimensional structure is formed when layers of a material are deposited onto a substrate and scanned with a high energy beam to at least partially melt each layer of the material. Upon scanning the layers at predetermined locations a tube device having a first tube and a second tube intersected with the first tube is formed.

Abstract: A wafer manufacturing apparatus includes a chuck table configured to hold an SiC ingot by a suction surface with a wafer to be manufactured on an upper side, an ultrasonic oscillating unit configured to oscillate an ultrasonic wave, a water supply unit, and a peeling unit configured to suck and hold the wafer to be manufactured, and peel the wafer to be manufactured. The chuck table includes a porous plate forming the suction surface and a base supporting the porous plate, and sucks and holds the SiC ingot even in a state in which an area of a second surface of the SiC ingot is smaller than an area of the suction surface, and the water flows on the suction surface exposed on the periphery of the SiC ingot.

Abstract: A solder joint, for bonding an electrode of a circuit board to an electrode of an electronic component, that includes: an Sn—Bi-based solder deposited on the electrode of the circuit board; and a solder alloy deposited on the electrode of the electronic component. The Sn—Bi-based solder alloy has a lower melting point than the solder alloy deposited on the electrode of the electronic component. Fine Bi phases in the solder joint each have an area of less than or equal to 0.5 ?m2. Coarse Bi phases in the solder joint each have an area of greater than 0.5 ?m2 and less than or equal to 5 ?m2. A proportion of the fine Bi phases among the fine Bi phases and the coarse Bi phases is greater than or equal to 60%.

Abstract: Provided is a preform solder including a first metal containing Sn and a second metal formed of an alloy containing Ni and Fe. Alternatively, provided is a preform solder (1) having a metal structure including a first phase (10) that is a continuous phase and a second phase (20) dispersed in the first phase (10), the first phase (10) contains Sn, the second phase (20) is formed of an alloy containing Ni and Fe, and a grain boundary (15) of a metal is present in the first phase (10).

Abstract: A soldering component and a method of fitting it to boards are introduced. The soldering component includes a body and a fitting portion. The fitting portion is fitted to an object. The body has an engaging portion with an elastic retraction space conducive to elastic retraction of two or more engagement portions, allowing the engagement portions to engage with another object. The soldering component has a weldable surface to be soldered to a weldable surface of the object. The weldable surface of the object has a built-in solder layer adapted to be heated for soldering the soldering component and the weldable surface of the object together. The soldering component is disposed in a carrier, taken out with a tool, compared with the object by a comparison device to determine a fitting position on the object, positioned at the fitting position with the tool, thereby being fitted to the object.

Abstract: A handling device for servicing a piston with a small end attached to the piston via a piston pin, having a basic frame, a receiving device that is pivotable or tiltable relative to the basic frame for the piston removed from an internal combustion engine, an actuator for pivoting or tilting the receiving device relative to the basic frame, and a locking device via which the receiving device is lockable on the basic frame in different pivot positions or tilting positions.

Abstract: A mount system and method of manufacture for e.g. a machine vision camera is disclosed. The mount system comprises a rectangular base, a lower clamp disc, an upper clamp disc, a tilting plate, an expansion clamp, and an O-ring. The expansion clamp comprises a tapered head screw and an expandable mandrel, both typically made of stainless steel. The mount system facilitates improved machine vision by enabling effective mounting of machine vision cameras in smaller spaces and/or spaces requiring unusual angles and intricate positioning. The mount system is also advantageous in inhospitable environments having harsh environmental factors. The mount system is also easier for machine vision personnel to learn and understand.

Abstract: A manufacturing method of a staple-less binding unit that includes a first binding unit that has plural recesses and projections and a second binding unit that is arranged to face the first binding unit and has recesses and projections that fit to the recesses and the projections of the first binding unit and in which mediums are bound by being interposed between the first binding unit and the second binding unit in a thickness direction of the mediums includes forming the binding units with a die, adjusting center positions of projecting portions of the binding units formed by the die and removed from the die, and adjusting outer shapes of the projecting portions of which the center positions have been adjusted.

Abstract: An alignment and installation jig for a screw anchor driving machine. The alignment and installation jig includes a laser target that can be moved from an alignment position to a driving position. The jig may also include one or more automated crimping assemblies to form permanent connections between overlapping foundation components while the machine is correctly oriented.

Abstract: A complex machine tool for cylindrical workpieces has a bed, a headstock assembly, at least one supporting assembly, and at least one machining assembly. The bed has three tracks being respectively a first track, a second track, a third track arranged in order. Each one of the three tracks defines a respective guiding direction, and the three guiding directions of the three tracks are mutually parallel. The headstock assembly is connected to the bed, and is located near one of two ends of the second track. The at least one supporting assembly is mounted on one of the three tracks and is used for supporting the cylindrical workpiece. The at least one machining assembly is mounted on one of the three tracks, is slidable along the track, and is located on a position at a spaced interval from the at least one supporting assembly.

Abstract: An ascent-detecting air supply port (33), a descent-detecting air supply port (43), and an air discharge port (44) are provided to a housing (2). The ascent-detecting air supply port (33) is communicatively connected to an air outlet (38) by an ascent-detecting air passage (39). The descent-detecting air supply port (43) is communicatively connected to the air discharge port (44) by a descent-detecting air passage (45). The descent-detecting air passage (45) is closed by a valve mechanism (49) including: a valve surface (50) provided on a piston portion (15); and a valve seat (51) provided on an inner surface of the housing (2), when an advance piston (14) is retracted to a lowered position.

Abstract: A machining unit for machining, in particular turning and/or milling, workpieces, in particular elongate workpieces, in particular shafts, includes a machining tool. The machining tool can be moved along at least two different, in particular combined, motion paths in a motion plane. The machining until also includes at least one drive unit, which is designed for moving the machining tool along a first motion path and along a second motion path, which is different from the first motion path, possibly in a combined manner.

Abstract: A fixture for facilitating the serial engraving of a plurality of cylindrical objects such as glasses or mugs mounted on individual serially arranged stations along a master base plate. Each station includes a drive structure and, spaced therefrom, a passive support structure. The two structures in each station can be gang-adjusted for object length. In addition, the support structures can be height-adjusted to level the engraved surfaces of tapered objects. All of the drive structures include drive wheel pairs and all are driven by a single stepper motor via a single shaft and individual belt and pulley systems.

Abstract: The present invention discloses a positioning system with an adjustable clamping force and a milling equipment for a rail transit honeycomb workpiece.

Abstract: A tool presetting and/or tool measuring apparatus device includes a carrier unit and a spindle unit, in particular motor spindle unit, which is supported by the carrier unit, which is at least configured for a rotation of an object inserted in the spindle unit, in particular a tool and/or a tool holder, around a spindle axis of the spindle unit and which comprises at least one drive unit for generating the rotation movement of the object, wherein the spindle unit includes a coupling unit which is configured, in particular for the purpose of changing a maximally achievable spindle torque, to drive the spindle unit in at least two differing modes.