Abstract: A finishing apparatus includes a workpiece-receiving device, a rotary drive configured to drive a workpiece in rotation about a workpiece axis and an oscillatory drive configured to produce a relative movement between the workpiece and a finishing tool in a direction that is parallel to the workpiece axis. A workpiece-conveying device has a workpiece holder that is moveable by a drive device between a working position in which the workpiece is in position to be machined and a loading/unloading position in which the workpiece is loadable/unloadable. The workpiece holder has a support device configured to support the workpiece. The drive device is formed as a swivel drive such that the workpiece holder is swivelable between the working position and the loading/unloading position along an arcuate swivel path.

Abstract: A compensated constant force spring device includes a bracket, a drum rotatably supported by the bracket, and a constant force spring wound on the drum. A motor is fixed to the bracket and provides a compensating force to the drum. The motor may be located in an interior volume of the drum. A control module may coupled to the motor to control the compensating force. A position sensor may be coupled to the control module. The compensating force may be responsive to a signal from the position sensor. The constant force spring may support a load and counterbalance gravitational forces on the load. The compensating force may be adjusted when the load approaches an end of a range of travel.

Abstract: A compensated constant force spring device includes a bracket, a drum rotatably supported by the bracket, and a constant force spring wound on the drum. A motor is fixed to the bracket and provides a compensating force to the drum. The motor may be located in an interior volume of the drum. A control module may coupled to the motor to control the compensating force. A position sensor may be coupled to the control module. The compensating force may be responsive to a signal from the position sensor. The constant force spring may support a load and counterbalance gravitational forces on the load. The compensating force may be adjusted when the load approaches an end of a range of travel.

Abstract: Some embodiments of the present clamps include a first clamp portion having a first end defining a recess and a second end configured to be coupled to a first structure, a second clamp portion having a first end configured to be coupled to a second structure and a second end configured to be received in the recess of the first clamp portion, and a shear pin configured to secure the second clamp portion relative to the first clamp portion. Some embodiments include a retaining member disposed in the recess. In some embodiments, the recess and/or retaining member is configured to resist shearing of the shear pin if a force is applied to the second clamp portion in a first direction, but not if the force is applied in a second direction. In some embodiments, the first direction is substantially parallel with, but opposite to, the second direction.

Abstract: Equipment for grinding external rings of roller bearings includes a supporting pin of a bearing to be ground, a stop extending outwardly from the supporting pin for axial positioning of a side of the bearing, a sliding flange on the pin which can be positioned to rest on the other side of the bearing, a clamping nut which can be firmly positioned on a complementary portion of the pin, skids preloaded by springs situated on opposite sides of the bearing, and a guiding element on the opposite side of the stop, which receives a structure carrying a pair of contrast rolls movable to be engaged with the external ring of the bearing creating a radial force thereon, which can be predetermined and regulated by a maneuvering element to eliminate the clearance of the bearing in the radial direction. A machine for housing equipment of the above specified type.

Abstract: Particular embodiments of the invention include methods and apparatus for deforming a tire sidewall. Such methods include the step of providing a tire having at least one sidewall connected to a corresponding bead. A further step includes constraining at least one of the sidewall and bead from moving laterally toward the other. Yet another step of such methods includes engaging the sidewall with an inclined member. Another step of such methods includes moving at lest one of the sidewall and bead in a lateral direction away from the other until the sidewall is laterally deformed into a laterally deformed configuration.

Abstract: A honing machine has at least one clamping unit that clamps a workpiece and has a rotary drive for the workpiece. A spindle unit has a stroke drive for an inner honing tool for inner honing of the workpiece. An outer honing device that is movable relative to the workpiece in an axial direction of the workpiece is provided. The outer honing device has several honing stones and an advancing device acting on the honing stones. The honing stones each are advanced in a radial direction relative to the workpiece. The advancing device has at least one linear drive for each one of the honing stones and a common drive motor for all of the linear drives.

Abstract: A grinding method of grinding a roller workpiece to be formed into a roller of a rolling bearing includes an outer peripheral face machining step. In the outer peripheral face machining step, an outer peripheral face of a regulating wheel that is rotating, is brought into contact with an outer peripheral face of the roller workpiece that is supported from below by a support member, to rotate the roller workpiece, and a grinding wheel is brought into contact with the outer peripheral face of the roller workpiece that is rotating to grind the outer peripheral face of the roller workpiece. In the outer peripheral face machining step, the outer peripheral face of the roller workpiece is ground with a reference member held in point contact with a center of an end face of the roller workpiece.

Abstract: The present invention relates to a grinding machine for grinding a workpiece, in particular cams, with a grinding wheel having a profile with a grinding region running substantially parallel to the axis of rotation of the grinding wheel and at least one profile section which does not run parallel to the axis of rotation of the grinding wheel, a control unit for controlling the grinding process, wherein the control unit is configured in such a manner that, with reference to position information on positions of edges of the workpiece in the direction of the longitudinal axis of the workpiece, the edges of the workpiece are successively deburred or chamfered by the at least one profile section of the grinding wheel during or after the grinding of the workpiece.

Abstract: Grinding machine for grinding workpieces, in particular cams, a grinding machine holder and a method for grinding cam sets using such a grinding machine. Grinding machine comprising a machine bed, at least one grinding spindle, two grinding wheel holders, on which in each case at least one grinding wheel is arranged and which are arranged in opposite directions to one another in their orientation and are oriented parallel to one another with their longitudinal axes, and two workholding devices which in each case have a work headstock and a steady rest and which are arranged in opposite directions to one another in their orientation and are oriented parallel to one another with their longitudinal axes, wherein each work headstock and the associated steady rest are designed for the arrangement therebetween of a separate work fixture having workpieces to be ground.

Abstract: A method of cutting a workpiece made of a highly-hard material is provided. The workpiece is cut by a machining device including a workpiece holder that holds the workpiece, a spindle device that rotates the workpiece holder, a tool holder that holds a tool, and a relative moving mechanism that relatively moves the workpiece holder and the tool holder at least in two axial directions orthogonal to each other. In the machining device, positioning errors in the axial directions are within 5 nm.

Abstract: A honing machine has at least one clamping unit that clamps a workpiece and has a rotary drive for the workpiece. A spindle unit has a stroke drive for an inner honing tool for inner honing of the workpiece. An outer honing device that is movable relative to the workpiece in an axial direction of the workpiece is provided. The outer honing device has several honing stones and an advancing device acting on the honing stones. The honing stones each are advanced in a radial direction relative to the workpiece. The advancing device has at least one linear drive for each one of the honing stones and a common drive motor for all of the linear drives.

Abstract: A centering machine for, in particular, optical lenses has two centering spindles. The rotationally drivable centering spindle shafts are axially aligned with respect to a centering axis and constructed at the ends for the mounting of clamping bells. A stroke device axially adjusts one centering spindle shaft relative to the other centering spindle shaft along the centering axis for alignment of the lens between the clamping bells. A clamping device applies to a centering spindle shaft a clamping force clamping the aligned lens. At least one processing unit is movable relative to the centering axis, with a tool for edge processing of the clamped lens. In order to enable an optimized bell clamping process, the stroke device and the clamping device and/or a rotary drive for the axially adjustable centering spindle shaft are arranged coaxially with respect to the centering axis.

Abstract: An apparatus for chemical mechanical planarization includes a spindle assembly structure and at least one substrate carrier, which make a linear lateral movement relative to each other while abrasive surfaces of a plurality of cylindrical spindles in the spindle assembly structure contact, and rotate against, at least one substrate mounted on the at least one substrate carrier. The direction of the linear lateral movement is within the plane that tangentially contacts the plurality of cylindrical spindles, and can be orthogonal to the axes of rotation of the plurality of cylindrical spindles.

Abstract: Devices, systems and methods for the recycling and recovery of carpet are disclosed herein. Devices, systems and methods for disassembling carpet into the various components used for carpet construction by abrasive removal and separation of components are also disclosed herein.

Abstract: A device for grinding spinning cots has a rotating grinding roller and a carriage that is linearly movable relative to the grinding roller. A pivot arm is pivotably supported on the carriage and movable between a loading position and a grinding position. A workpiece receptacle is mounted on the pivot arm and adapted to receive a spinning cot to be ground. A feed device is provided that is actuatable in accordance with progression of a grinding process performed on the spinning cot toward a grinding surface of the grinding roller. The pivot arm is moveable by the feed device relative to the carriage. A device is provided that is actuatable independent of the feed device for manual adjustment of the carriage into a desired linear position relative to the grinding roller.

Abstract: A prescription label identity peeler includes a box-shaped housing. A lid extends over the box-shaped housing. A sanding member is adjustably carried within the box-shaped housing. A pair of linkage arms is pivotally extend between the lid and the sanding member. The motorized linkage arms will move the sanding member simultaneously and horizontally against the empty pill bottle in an inverted position, while the wheel on the swing arm assembly will contact a bottom end of the empty pill bottle via compression of the springs, thereby removing the label from the empty pill bottle when the inverted empty pill bottle rotates.

Abstract: A grinding machine includes a pair of workpiece support devices (12, 13), which clamp and rotate a workpiece (W), on a bed (11). A pair of saddles (14) is provided on the bed (11) in such a way as to be movable along the rotational axis of the workpiece (W). Grindstone heads (16) provided with rotating grindstones (16c) and drive mechanisms (16d) are supported on the saddles (14) in such a way as to be movable in a direction that perpendicularly intersects the movement direction of the saddles (14).

Abstract: In a swivel device, a swivel head provided with a plurality of tool spindles thereon is mounted on a support base to be turnable about a swivel shaft being upright on the support base. An annular space portion is formed between the support base and the swivel head in coaxial relation with the swivel shaft. The tool spindles each mounting a grinding wheel are arranged on the swivel head to extends in a horizontal plane which crosses the annular space portion at about a mid position in the vertical direction of the annular space portion. A direct drive motor is built in the annular space portion so that a driving center of the direct drive motor is at almost the same height as the horizontal plane including the axes of the grinding wheels. Thus, the swivel device can lower the positions of the rotational axes of the grinding wheels and is rigid against inclination caused by grinding resistance acting on the grinding wheels.

Abstract: A method for polishing the edge of a semiconductor wafer comprises (a) providing a semiconductor wafer which has been polished on its side surfaces and which has a rounded edge; (b) polishing the edge of the wafer by fixing the semiconductor wafer on a centrally rotating chuck, delivering the wafer to a centrally rotating polishing drum, which is inclined with respect to the chuck and to which a polishing pad containing fixedly bonded abrasives is applied, and pressing semiconductor wafer and polishing drum onto one another while a polishing agent solution containing no solids is continuously supplied.

Abstract: Disclosed is a method for grinding a machine part that is used as a drive shaft, for example, rotates about the longitudinal axis thereof during the grinding process, and is provided with a journal at one axial end thereof and a recess at the opposite end thereof. The grinding process is carried out in one and the same grinding machine. In said grinding method, the machine part is brought into different clamped states by means of a chuck of a workpiece spindle head with releasable clamping jaws and a centering tip, a backrest, and/or a tailstock quill. Changing the clamped states has the advantage that the machine part remains in the same position in a single grinding machine, i.e. the clamped position, in all the different clamped states such that more accurate sizes, shapes, and positions can be obtained in an economical manner and all areas of the machine part which are to be ground are successively accessible to the grinding disks.

Abstract: A wheel truing apparatus adapted for use in a cylindrical grinding machine wherein a work head with a work spindle for support of a workpiece and a wheel head with a grinding wheel for grinding the workpiece are mounted on a bed for relative movement in a Z-axis direction parallel with the rotation axis of the work spindle and in an X-axis direction crossing the Z-axis direction, characterized in that the wheel truing apparatus comprises a rotary drive portion mounted on the work head or a member united therewith, and a wheel truing tool supported on the rotary drive portion for rotation therewith, the wheel truing tool being provided at its outer periphery with a truing portion for truing a grinding surface of the wheel brought into contact therewith, wherein the rotary drive portion is placed in a position adjacent to said work head in a tooling area defined by a stroke of the relative movements of said wheel head and said work head in the Z-axis direction and apart from said work spindle radially outward a

Abstract: A dental prosthesis manufacturing machine is disclosed. The machine includes two spindles each having a roughing tool and a finishing tool, a workpiece holder for holding a workpiece which forms the dental prosthesis, and a base supporting the two spindles and the workpiece holder. The machine is capable of simply alternating the roughing tool with the finishing tool according to the accuracy required when the workpiece is machined.

Abstract: A polishing device includes an outer barrel, an inner barrel, polishing members, and an actuator. The outer barrel defines a chamber and includes inner surfaces substantially parallel to a central axis of the outer barrel. Each of the inner surfaces defines a holding groove for holding a workpiece. The inner barrel is received in the chamber and includes a side surface substantially parallel to the central axis. The side surface defines installation grooves. Each polishing member includes an elastic piece, a polishing motor connected to a bottom of a corresponding installation groove by the elastic piece and received in the corresponding installation groove, and a polishing plate connected to the polishing motor and capable of being driven to rotate by the polishing motor. The actuator is configured for driving the outer barrel to spin and move back and forth along the central axis.

Abstract: A carriage arrangement for a machine tool, which can be adjusted similar to a compound slide, has an increased rigidity against a machining force being taken up by said arrangement in that according to the invention a first carriage (1) can be adjusted relative to a machine base (4) along a first trajectory that is tilted toward the direction of force, and a second carriage loaded with the machining force can be adjusted at the first carriage along a second trajectory that is orthogonal to the direction of force (FIG. 1).

Abstract: A machining apparatus has a vertical support frame defining two machining stations spaced apart in a direction, holders in the stations for rotating respective workpieces each about a respective station axis, and a transfer device for loading rough workpieces into the holders and for taking finished workpieces out of the holders. A single machining tool can be shifted in the direction between one position engaging the workpiece in one of the stations and out of engagement with the workpiece in the other of the stations and another position engaging the workpiece in the other station and out of engagement with the workpiece in the one station.

Abstract: A method and apparatus for releasably attaching flexible abrasive disks to a flat-surfaced platen that floats in three-point abrading contact with three rigid flat-surfaced rotatable fixed-position workpiece spindles that are mounted on a flat surface of an abrading machine base where the spindle surfaces are in a common plane. Three spindles are positioned to form a three-point triangle of platen supports where the rotational-centers of each of the spindles are positioned at the center of the annular width of the platen abrading surface. The spindles are supported by two-piece spindle-mount devices having a common-radius spherical joint that allows the spindles to be rotated to co-planar align the top flat surfaces of the rotatable spindle-tops and then to be locked into this aligned position. Spindle-mount spherical-action locking devices include mechanical fasteners and stress-free adhesive tabs. Precision-flat platens can be used as an alignment jig for co-planar alignment of the spindles.

Abstract: A method of preparing a polarizing dye receiving surface includes bringing the polarizing dye receiving surface into contact with a brushing surface of a brush pad carrying an abrasive material and brushing the polarizing dye receiving surface with the brushing surface in one or more brushing strokes. Each brushing stroke comprises effecting a unidirectional relative motion between the polarizing dye receiving surface and the brushing surface along a brushing path. The polarizing dye receiving surface is separated from the brushing surface after the brushing.

Abstract: In a wheel spindle device wherein a plurality of grinding wheels are attached in a juxtaposed relation to a wheel spindle rotatably carried on a wheel head of a grinding machine, a reference position for specifying a position in the circumferential direction of the grinding wheel is provided on a core member of each of the grinding wheels, and a plurality of inclined grooves at predetermined angular intervals are formed on a grinding surface of each grinding wheel to be inclined relative to the circumferential direction of each grinding wheel. In order that the fluctuations in the dynamic pressure and the grinding resistance between respective grinding wheels and workpiece portions ground therewith do not grow as a combined or synergy effect, the inclined grooves on each grinding wheel are shifted in angular phase from those on another grinding wheel, so that grinding efficiency and accuracy can be enhanced.

Abstract: A grinding apparatus for grinding workpieces includes two clamping rods and a base. Each of the two clamping rods has a first end and an opposite second end. The first ends are opposite to each other for clamping workpieces therebetween. The base includes a receiving groove for receiving the workpieces therein and two positioning slots at opposite sides of the receiving groove. The positioning slots are aligned with each other and configured for receivingly engaging with the clamping rods to align the clamping rods with each other.

Abstract: A cylindrical grinder is disclosed that includes a support unit including an upper support device and a lower support device, in which an ingot of silicon single crystal is interposed in a direction of axis line between the upper support device and the lower support device and is clampingly held to be rotated around the axis line, and a grinding unit that relatively moves along the direction of axis line of the ingot to traverse grind an outer circumference of the ingot. The upper support device is placed at an upper position and the lower support device is placed at a lower position, so that the support unit clampingly holds the ingot in a state in which the direction of the axis line of the ingot is disposed along a vertical direction.

Abstract: A device for grinding spinning cots has a rotating grinding roller and a carriage that is linearly movable relative to the grinding roller. A pivot arm is pivotably supported on the carriage and movable between a loading position and a grinding position. A workpiece receptacle is mounted on the pivot arm and adapted to receive a spinning cot to be ground. A feed device is provided that is actuatable in accordance with progression of a grinding process performed on the spinning cot toward a grinding surface of the grinding roller. The pivot arm is moveable by the feed device relative to the carriage. A device is provided that is actuatable independent of the feed device for manual adjustment of the carriage into a desired linear position relative to the grinding roller.

Abstract: An apparatus, system and method for cleaning a substrate edge include a composite applicator that cleans bevel polymers deposited on wafer edges using frictional contact in the presence of fluids. The composite applicator includes a support material and a plurality of abrasive particles distributed within and throughout the support material. The composite applicator cleans the edge of the wafer by allowing frictional contact of the plurality of abrasive particles with the edge of the wafer in the presence of fluids, such as liquid chemicals, to cut, rip and tear the bevel polymer from the edge of the wafer.

Abstract: A device for removing an information-bearing layer of an optical disc comprises a housing defining a first chamber and a second chamber, a mount to selectively mount an optical disc having an information-bearing layer adjacent the first chamber, a cutter within the first chamber, a drive mechanism operatively connected to the cutter, and a passageway between the first and second chambers. The cutter causes the information-bearing layer of the disc to form particulate matter, and the particulate matter is caused to move through the passageway into the second chamber. The resulting particulate matter has a particle size less than about 326 microns to meet the standards of the Department of Defense and NIST for digital data destruction.

Abstract: A method of cutting a workpiece made of a highly-hard material is provided. The workpiece is cut by a machining device including a workpiece holder that holds the workpiece, a spindle device that rotates the workpiece holder, a tool holder that holds a tool, and a relative moving mechanism that relatively moves the workpiece holder and the tool holder at least in two axial directions orthogonal to each other. In the machining device, positioning errors in the axial directions are within 5 nm.

Abstract: Disclosed is a method for grinding a machine part that is used as a drive shaft, for example, rotates about the longitudinal axis thereof during the grinding process, and is provided with a journal at one axial end thereof and a recess at the opposite end thereof. The grinding process is carried out in one and the same grinding machine. In said grinding method, the machine part is brought into different clamped states by means of a chuck of a workpiece spindle head with releasable clamping jaws and a centering tip, a backrest, and/or a tailstock quill. Changing the clamped states has the advantage that the machine part remains in the same position in a single grinding machine, i.e. the clamped position, in all the different clamped states such that more accurate sizes, shapes, and positions can be obtained in an economical manner and all areas of the machine part which are to be ground are successively accessible to the grinding disks.

Abstract: In a grinding device, first, an eddy-current-sensor detects a distance from the eddy-current-sensor to an outer peripheral surface of a belt layer while a tire to be retreaded held by a pair of half rims is caused to rotate. Thus, an eccentricity amount and an eccentricity direction of the tire to be retreaded with respect to a device axial center, corresponding to the phase of the tire to be retreaded, can be respectively determined, so position control signals corresponding to the phase, eccentricity amount and eccentricity direction of the tire to be retreaded can be generated. Next, on the basis of the position control signal, a carriage causes a rasp to be moved in a radial direction with respect to the tire to be retreaded along the radial direction whose center is a device axial center, and the rasp grinds a tread surface of the rotating tire to be retreaded.

Abstract: A neck portion grinding apparatus and method is designed to reduce working man-hours and to improve processing accuracy with respect to a processing of a workpiece. The neck portion grinding apparatus includes a grinding device having a disc-like grinding wheel and a wheel rotating device for rotating the grinding wheel, and a machine tool having a main shaft for rotatably supporting a rotating tool and a table mounting the grinding device thereon, and relatively moving the main shaft and the table by numeral control. A shape of a neck portion of the rotating tool can be changed by relatively moving the main shaft and the table while mutually rotating the rotating tool and the grinding wheel, and grinding the rotating tool by the grinding wheel.

Abstract: A locking mechanism of a linear motor travel slider, includes: a serration member having a teeth portion and disposed on one of the bed and the travel slider extending in a slider-traveling-direction; a bracket supported by the other of the bed and the travel slider; an actuator supported by the other of the bed and the travel slider; a locking member supported by the actuator having a teeth portion engageable with the teeth portion of the serration member; and a controller for controlling the actuator to retain the lock member in an unlocked position when the linear motor is energized and for stopping the actuator when the linear motor is in a stop state due to a power failure. The locking member includes an urging member for making the locking member engage with the serration member while the actuator is in a stop state.

Abstract: The present invention relates to a grinding wheel truing tool, its manufacturing method, and a truing apparatus, a method for manufacturing a grinding wheel and a wafer edge grinding apparatus using the same. The grinding wheel truing tool of the present invention compensates a groove of a fine-grinding wheel for fine-grinding a wafer edge, and includes a truer having an edge of the same angle as a slanted surface of the groove of the fine-grinding wheel and a cross-sectional shape corresponding to a cross-sectional shape of the groove. The present invention uses the truing tool to easily process the groove of the grinding wheel for fine-grinding the wafer edge.

Abstract: Methods for cylindrical grinding a workpiece are disclosed. The method includes cylindrical grinding, with a bonded abrasive wheel having a permeable structure that includes interconnected porosity, a workpiece at a specific cutting energy of less than about 12 Hp/in3·min (29.7 J/mm3), and a material removal rate of at least about 1 in3/min·in (10.8 mm3/sec/mm)grinding. The bonded abrasive wheel may include at least about 3 volume percent of a filamentary sol-gel alpha-alumina abrasive grain having an average length-to-cross-sectional-width ratio of greater than about 4:1, or agglomerates thereof. In one embodiment, the workpiece is ground in the presence of a water soluble oil.

Abstract: In a method for machining rotation pieces, including at least one working step, and wherein at least one surface of the workpiece which is clamped in the device is subjected to a grinding step, at least one front-sided boring is carried out in the workpiece in the same clamping device used for the grinding step. For example, during a grinding process, the workpiece can be clamped at least at both ends in a clamping apparatus, and for the boring process, the clamping apparatus can be released at least at one end and a chuck for a boring tool can be arranged there, which then performs the desired end-face boring.

Abstract: A blade-sharpening machine for sharpening any one of various sizes of rotary blades comprises a drive unit and a universal blade chuck for holding the blade to be sharpened. The drive unit further includes a sharpening assembly that sharpens the blade while the drive unit rotates the blade chuck. The blade chuck includes a chassis and jaws that are circumferentially spaced about the chassis and are shiftably attached thereto for securing the rotary blade. A spring-loaded fastener normally urges the jaws radially inwardly into engagement with the blade. A centrally-positioned cam is operable to shift the jaws simultaneously so that the blade can be selectively secured on the blade chuck.

Abstract: A method of grinding the outer circumferential surface of a workpiece 5 formed of a hard and brittle material into a predetermined shape using a grinding wheel while rotating the workpiece 5 is disclosed. The method includes plunge grinding the workpiece 5 at an arbitrary portion (plunge ground portion 21) in the longitudinal direction of the workpiece 5 by causing the grinding wheel to come in contact with the workpiece 5 in a direction which intersects a rotational axis 8 of the workpiece 5, and traverse grinding the workpiece 5 toward the plunge ground portion 21 by moving the grinding wheel relative to the workpiece 5 in a direction parallel to the rotational axis 8 of the workpiece 5. This allows the outer circumferential surface of the workpiece made of a hard and brittle material, such as a honeycomb structure used for a DPF, to be ground into a predetermined shape in a short time, and prevents occurrence of chipping during grinding.

Abstract: The present invention relates to grinding apparatus for grinding the hard metal inserts of rock drill bits, said grinding apparatus having a grinding machine carried on an support system that provides a feed pressure for said grinding machine during grinding, said grinding machine equipped with a grinding pin driven by motor to rotate about its longitudinal axis wherein the grinding cup is rotated at variable speeds and the support system provides a variable feed pressure.

Abstract: Aimed at thoroughly preventing abrasive and dusts from adhering onto the circuit-forming region of a wafer, improving yield ratio of semiconductor devices, and thereby improving operation rates of the individual manufacturing apparatuses in the succeeding stage, a semiconductor wafer polishing apparatus of the present invention has a polishing unit polishing the circumferential edge side of a disc-formed wafer; and a gas blowing unit blowing a gas G against the surface of the wafer, so as to separate the space over the wafer by a curtain C of the gas G between a polishing field PF in which the wafer is polished by the polishing unit and a normal field NF except the polishing field PF.

Abstract: A precision machining apparatus and a precision machining method capable of carrying out grinding with accuracy by performing switching control, for example, on a device for rotating a grinding wheel according to grinding stages through the amount of movement and constant pressure changed stepwise. To a second pedestal 3 supporting a rotary device 6b for rotating a grinding wheel b, an actuator 5 and a feed screw mechanism 4 constituted by at least a feed screw 41 and a nut 42 are attached. In a rough grinding stage, the movement of the rotary device 6b and the second pedestal 3 is adjusted through a predetermined amount of movement of the nut 42. In a super-precision grinding stage, the movement of the rotary device 6b and the second pedestal 3 is adjusted by pressure control using stepwise a plurality of pneumatic actuators 5a, 5b differing in pressure performance. An attitude control device 7 is interposed between a first pedestal 2 and a rotary device 6a for rotating an object a to be ground.

Abstract: A method of processing an antifriction bearing unit for a wheel, the antifriction bearing unit including an outer race, an inner race, a plurality of rolling elements and a flange portion for directly or indirectly mounting a brake disk provided to one of the outer and inner races, the method includes: assembling the outer and inner races and the rolling element together; after assembling, placing the one of the outer and inner race in position incapably of circumferential rotation; grinding the flange portion by bring the flange portion into contact with a grindstone which is rotated while the other of the outer and inner race is left free.

Abstract: The grinding machine (10) according to the invention serves in particular for the machining or production of tools. It comprises a machine bed 11 and a workpiece spindle (14) arranged thereon, which receives the workpiece (13) to be machined, as well as a grinding station (19) arranged next to the workpiece, the station having a grinding spindle for the reception of a grinding tool (20), and is provided with a workpiece guide system (23) arranged at the machine bed for the support of the workpiece at the grinding location (21).

Abstract: The invention relates to a machine (1) for grinding the blades of a turbine rotor (2) or a compressor. The inventive machine consists of a rotary head (6) which is provided with two different grinding wheels (7, 7?) for grinding the rotors (2), three carriages (8, 9, 10) of the head which are used for the linear and angular movement thereof, a machine control unit (16) comprising a numerical control (CNC) which is used to calculate the grinding position of each grinding wheel, an optical sensor (19) which is used to measure the radius R of the blades and a device (12, 13) for the individual shaping of each grinding wheel which is supported on a carriage (14, 15) with means for the linear movement thereof (U, C) and which operates automatically during the grinding process without altering the position of the grinding wheel.