Abstract: A grinding apparatus grinds a workpiece by rotating the workpiece held by main spindles and a grinding wheel held by a wheel spindle, and by relatively moving the grinding wheel toward and away from the workpiece. The grinding apparatus includes a first detection unit that detects a rotational phase of the workpiece; a second detection unit that detects a grinding resistance moment at a grinding point between the grinding wheel and the workpiece, or detects a drive current of a rotary drive unit of the workpiece or a rotary drive unit of the grinding wheel; a storage unit that stores the grinding resistance moment or the drive current in a manner associated with the rotational phase; and a determination unit that determines a slip between the workpiece and the main spindles based on the grinding resistance moment or the drive current at a current rotational phase, and on the grinding resistance moment or the drive current at the same phase as the current rotational phase of a previous time.

Abstract: A system for tracking workpiece movement during grinding of the workpiece includes a track, a motorized carriage movably mounted on the track, a detector, and a controller. A position of the carriage is determined by an encoder of the track. The detector is mounted on the carriage and includes a detection window and a sensor. The sensor detects a workpiece edge during grinding by detecting an image of the workpiece edge in the detection window. The controller determines a grinding position of the workpiece based on position data received from the carriage and edge data received from the detector. The controller controls the carriage to move in a forward direction or in a reverse direction to maintain the position of the image of the workpiece edge in the detection window.

Abstract: A sculptured drum for a retread process that has an inner radial section with a central axis that extends in an axial direction. The sculptured drum has a plurality of support members that extend outward from a drum outer surface in a radial direction and that are located outward from the inner radial section in the radial direction. A tread that has a plurality of grooves is supported by the sculptured drum during a brushing process and pass across the sculptured drum such that some but not all of the grooves have one of the support members disposed therein. The support members when disposed within the grooves do not completely fill the grooves, and when disposed within the grooves engage a lower surface of the tread.

Abstract: A method and device for simultaneous centerless cylindrical grinding of multiple workpieces (11, 12, 13, 14), at least sections of which are rotationally symmetrical, the workpieces are arranged on a support apparatus (200) one behind the other between at least one grinding wheel (110) and at least one regulating wheel (120), and wherein the axis of rotation of the regulating wheel is inclined with respect to a horizontal plane extending parallel to the workpiece axes of rotation and the grinding wheel axis of rotation by an inclination angle (?). During grinding the workpieces are arranged with a height offset relative to each other corresponding to at least a quarter of the inclination angle (?) of the axis of rotation of the regulating wheel with respect to the parallel plane to render the respective bearing angles (?) of the workpieces on the inclined regulating wheel consistent.

Abstract: A method for polishing at least one wafer composed of semiconductor material that has a front side and the rear side includes performing at least one first polishing step including simultaneously polishing both front and rear sides of the at least one wafer at a process temperature between an upper polishing plate and a lower polishing plate. Each of the upper polishing and lower polishing plates is covered with a polishing pad having an inner edge and an outer edge, a hardness of at least 80° Shore A, a compressibility of less than 2.5%, and respective upper and lower surfaces that come into contact with the wafer being polished. The upper and lower surfaces form a polishing gap extending from the inner edge to the outer edge. A height of the polishing gap at the inner edge differs linearly from the height of the polishing gap at the outer edge.

Abstract: Provided is a grinding machine that does not require work for replacing an upper roller (12) and a lower roller (14) and that ensures interchangeability thereof, even when the outer diameter of a workpiece (W) and the inclination state of the generating line of the workpiece (W) are different. A headstock (7) of the grinding machine comprises an upper-roller device (13) on which the upper roller (12) is rotatably supported, and a lower-roller device (15) on which the lower roller (14) is rotatably supported. The upper-roller device (13) and the lower-roller device (15) are provided with vertical position adjustment mechanisms (22), (46), respectively, for modifying the height position related to the vertical direction thereof, and a turn angle adjustment mechanism (21) for modifying the inclination angles of the upper-roller device (13) and the lower-roller device (15) with respect to the horizontal direction of the center axes thereof.

Abstract: Grinding is performed on an outer peripheral surface of a shaft member while rotationally driving the shaft member under a state in which both end surfaces of the shaft member are sandwiched between a pair of support portions. A convex surface is formed on one axial end surface of the shaft member or an end surface of one of the pair of support portions, and a flat surface is formed on the other of the one axial end surface of the shaft member and the end surface of the one of the pair of support portions. The flat surface and an apex of the convex surface are brought into contact with each other to support one axial end portion of the shaft member.

Abstract: The present invention pertains to a centerless cylindrical grinding machine with a grinding wheel and a regulating wheel that can be laterally displaced toward a work piece that can be held between these wheels, and with a rest blade for supporting the work piece that is realized rigid in the vertical direction and arranged and dimensioned such that a rotational axis of the work piece and a rotational axis of the grinding wheel lie in a common plane, wherein a height adjustment of the rotational axis of the regulating wheel beyond the plane is kinematically decoupled from the lateral displacement of the regulating wheel and can be varied in order to position the regulating wheel on the supported work piece.

Abstract: A multi-carriage dual-spindle symmetrical grinding processing center, wherein: A work table with a rotary table therein is positioned on a first carriage which is attached to a front base; first and second upright posts are positioned in a gantry form on a back base; a horizontal grinding head is connected to a second carriage between the upright posts; a third left carriage and a third right carriage are slidingly connected to the first and second upright posts, respectively, and a left slider and a right slider are connected to the third left carriage and the third right carriage, respectively; a vertical grinding head is installed at the front end of the right slider; an automatic tool changing device is equipped with the vertical grinding head, and a grinding wheel profile dressing device can be installed on the second carriage and on the left slider.

Abstract: A master servo motor and a slave servo motor that synchronously drive for rotation a master main spindle provided with a center that supports one end of a work piece and a slave main spindle provided with a center that supports the other end of the work piece are included. Before grinding, a slip detection cycle that detects a limit current value for the servo motors, at which the work piece and the centers slip, is executed and, during grinding, a grinding condition is changed to prevent a slip between the work piece and the centers in advance at the time when any one of current values of the servo motors has reached a slip threshold value set on the basis of the limit current value.

Abstract: The invention relates to a device for dressing a grinding wheel, comprising a sleeve to hold a corundum rod laterally and to guide it along its longitudinal axis, a ram to apply constant thrust force onto the corundum rod held in place and guided in the sleeve, to bring it into contact with the grinding wheel, means of rigidly connecting the ram shaft to the end of the corundum rod, and linear guide means for the sleeve for translating the corundum rod parallel to the axis of the grinding wheel while keeping the rod pressed against the grinding wheel with a constant force. Application to a centerless grinder in which the grinding wheel is used to grind nuclear fuel pellets.

Abstract: A centerless grinding machine includes a frame with an upper base and includes a driven regulating wheel and a driven grinding wheel mounted to the frame. At least one of the wheels is mounted to the upper base and hangs downwardly from the upper base. At least one of the wheels is indexable laterally along an X direction. The wheels are for supporting and grinding a work piece placed between the grinding wheel and the regulating wheel. Preferably the upper base is spaced from and above the at least one wheel and the regulating wheel and the grinding wheel are operably mounted to the upper base such that the wheels hang downwardly from the upper base.

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 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 grinding machine for grinding work pieces between centers, as well as for centerless grinding, features a drive for a grinding wheel and a drive for a regulating wheel. The work piece can be supported between the grinding wheel and the regulating wheel either between centers on a work piece axis or on a rest for centerless grinding. The driving axis of the regulating wheel and the work piece axis are parallel, and the wheels can be adjusted relative to the work piece independently of one another. The drive of the regulating wheel serves for driving the work piece while grinding between centers or for driving the work piece during centerless grinding. In addition, a means for measuring the contact pressure of the regulating wheel on the work piece is provided for grinding between centers. This means may consist, for example, of a pressure sensor.

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 roll grinding apparatus includes a clamping device, a grinding wheel, a first driver, and a second driver. The clamping device includes a base, a support connected with the base and being movable relative to the base, a first clamping member and a second clamping member coupled to the first clamping member. The first clamping member and the second clamping member are rotatably mounted on the support for cooperating to clamp the workpiece. The first clamping member and the second clamping member are movable relative to the grinding wheel by movement of the support relative to the base so that the rotary axes of the first and second clamping members are adjusted to be parallel to a central axis of the grinding wheel. The first driver is connected with the first clamping member. The second driver is connected with the second clamping member.

Abstract: To provide a centerless grinding method which facilitates a tooling change and enables automation. A blade 11 is disposed slidable along a first straight line 101, i.e., Y axis, a grinding wheel 7 is disposed slidable along a second straight line 102, i.e., X axis, and a regulating wheel 9 is disposed slidable along a third straight line 103 intersecting with the second straight line at an angle ?2. At a tooling change, then, the blade is moved in a negative direction of the Y axis with an increase in diameter of a workpiece, the grinding wheel is moved in a negative direction of the X axis with an increase in diameter of the workpiece, and the regulating wheel is moved in a positive direction of the Y axis and also in a positive direction of the X axis with an increase in diameter of the workpiece. With this, angles ? and ?, which a contact angular position reference line S makes with line segments OB and OR, are made always constant.

Abstract: An apparatus and method for grinding a workpiece by rotating the workpiece about a rotational axis, rotating a cylindrical grinding wheel about a rotational axis being parallel to the rotational axis of the workpiece, moving the grinding wheel relative to the workpiece at least in one of a first direction being perpendicular to the rotational axis of the workpiece for grinding the workpiece at a cylindrical surface of the grinding wheel and a second direction being parallel to the rotational axis of the workpiece for grinding the workpiece at an end surface of the grinding wheel being perpendicular to the rotational axis of the grinding wheel, and by superimposing a vibration signal including a plurality of frequency components to a driving signal outputted to one of a workpiece rotating means for rotating the workpiece and a grinding wheel rotating means for rotating the grinding wheel.

Abstract: A compression molding apparatus and method for the manufacture of abrasive layers for abrasive tooling which provides a compression mold space defined between an inflexible wall surface and a flexible wall surface. The apparatus and method of the present invention is particularly well suited to making annular or hollow cylindrical shaped abrasive layers of novel configurations during a single mold cycle useful for grinding wheel and the like, as well as other shapes such as laps, wherein the flexible wall expanded with fluid pressure provides a highly uniform distribution of pressure against the surface of the mold composition being formed. In an annular configuration, the flexible wall is used to radially direct pressure against a molding composition disposed in an annular configuration wherein the axial length of the annular mold shape formed may be many times greater than priorly obtained by the prior art means.

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: 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 mechanism for suppressing grinding-cutting vibration comprises a C-shaped base, a fixed support seat, a clamp device and a vibration absorber. Based on vibration absorbing principle of the vibration theory, the clamp device is connected to the movable cutting machine, so as to move along with the cutting machine during the machining operation, and the clamp force applied to clamp the workpiece is adjustable. By such arrangements, the vibration energy produced at the time of cutting the workpiece can be transferred to the vibration absorber through the clamp device, and then a part of the vibration energy will be absorbed by the vibration absorber, thus achieving the objective of reducing vibration of the cut position.

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: An apparatus for polishing an edge surface of a glass substrate for magnetic recording media. The apparatus includes a grindstone including abrasive grains mixed with a resin. The grindstone is configured to polish at least the edge surface of the glass substrate. The grindstone has a reentrant groove with a bottom surface and sidewall surfaces such that the bottom surface of the reentrant groove contacts the edge surface of the glass substrate and the sidewall surfaces of the reentrant groove contacts chamfered sidewalls of the glass substrate.

Abstract: An apparatus and method for grinding a workpiece by rotating the workpiece about a rotational axis, rotating a cylindrical grinding wheel about a rotational axis being parallel to the rotational axis of the workpiece, moving the grinding wheel relative to the workpiece at least in one of a first direction being perpendicular to the rotational axis of the workpiece for grinding the workpiece at a cylindrical surface of the grinding wheel and a second direction being parallel to the rotational axis of the workpiece for grinding the workpiece at an end surface of the grinding wheel being perpendicular to the rotational axis of the grinding wheel, and by superimposing a vibration signal including a plurality of frequency components to a driving signal outputted to one of a workpiece rotating means for rotating the workpiece and a grinding wheel rotating means for rotating the grinding wheel.

Abstract: An extremely precise computer controlled grinding machine having the capability to write its own computer programs for controlling the grinding machine to perform individual tasks, including both grinding and dressing to several millionths of an inch. A new device for dressing is included which is directly on the machine, alleviating the need for a separate dressing machine. The Windows-based computer program is easy to use, and includes numerous features for self-maintenance and reproducibility.

Abstract: A grinding machine for grinding work pieces (3) between centers, as well as for centerless grinding, features a drive for a grinding wheel (1) and a drive for a regulating wheel (2). The work piece (3) can be supported between the grinding wheel (1) and the regulating wheel (2) either between centers on a work piece axis (W) or on a rest for centerless grinding. The driving axis of the regulating wheel (2) and the work piece axis (W) are aligned parallel and the grinding wheel (1) and the regulating wheel (2) can be adjusted relative to the work piece (3) independently of one another. The drive of the regulating wheel (2) serves for driving the work piece (3) while grinding between centers (4) or for driving the work piece (3) during centerless grinding. In addition, a means for measuring the contact pressure of the regulating wheel on the work piece is provided for grinding between centers (4). This means may consist, for example, of a pressure sensor (8).

Abstract: A grinding system for grinding feedstock includes a transport apparatus, a grinding apparatus, and a controller. The transport apparatus continuously transports feedstock of an arbitrarily long length at a desired feed rate, and the grinding apparatus grinds the feedstock transported by the transport apparatus. The controller controls a grinding position of the grinding apparatus and a longitudinal position of the feedstock during grinding to be coordinated with each other.

Abstract: A machining apparatus for conducting at least one of a cutting process and a grinding process, comprises a stationary base; and a working device mounted on the stationary base and having a degree of freedom of more than two axes to conduct at least one of a cutting process and a grinding process, the working device comprising a first working bench which is formed of a ceramic material and is movable linearly with a degree of freedom of not less than one axes or more while holding a work piece or a tool.

Abstract: During centerless cylindrical grinding, attention must be paid to the fact that the workpiece (3) is placed in a very specific position between the grinding wheel (1), the regulating wheel (2) and the support guide (4). The optimal position of the workpiece (3) initially set cannot be maintained as a result of the progression of the grinding process and the changes caused by said process in the diameter and contour of the workpiece (3). The invention provides a solution to said problem, whereby height adjustment and/or the oblique position of the support guide (4) are automatically modified in accordance with the progression of the grinding process and during said grinding process with the purpose of achieving operationally optimal readjustment. The progression of the grinding process can be detected using measuring techniques, e.g. by measuring the diameter of the workpiece (3) or its deviation from roundness and using said measurement as output variable for adjusting the support guide (4).

Abstract: A centerless grinding apparatus (10) includes an outer diameter surface grinding wheel (11) for grinding the outer diameter surface of a work (1) of a substantially cylindrical shape, a regulating wheel (12) for supporting the outer diameter surface of the work (1) in conjunction with the outer diameter surface grinding wheel (11) and an end surface grinding wheel (21) for grinding the end surface of the work (1). The end surface grinding wheel (21) grinds the end surface of the work (1) while the outer diameter surface grinding wheel (11) grinds the outer diameter surface of the work (1) in a state that the work (1) is disposed between the outer diameter surface grinding wheel (11) and the regulating wheel (12).

Abstract: A machining apparatus 10 of an end face of a roller includes a rotatable inner disk 11, a cage 14 having a pocket portion 13 for holding a plurality of rollers 12 at predetermined intervals in a peripheral direction at an outer diameter portion of the inner disk 11 and rotatable independently from the inner disk 11, and a drive belt 15 hung over outer diameter portions of the plurality of rollers 12 held by the inner disk 11 and the cage 14, and by rotating the inner disk 11, the cage 14 and the drive belt 15 in predetermined directions, the roller 12 is revolved while being rotated and the end face of the roller is crowned by an elastic cup grinding wheel 19.

Abstract: Disclosed is a grinding table apparatus for a liquid crystal display panel and a grinder using the adapt to various sizes of unit liquid crystal display panels for grinding edges of the corresponding liquid crystal display panel by adjusting a variable moving distance of the grinding tables instead of replacing the previous grinding table. The present invention includes at least two grinding tables displaced in a direction making the grinding tables get farther from or closer to each other to adapt to the size of the unit liquid crystal display panel to grind edges of the unit liquid crystal display panel.

Abstract: Disclosed is a cylindrical grinding machine of the type that a workpiece support device composed of a work head and a foot stock is mounted on a forward upper portion of a bed while a wheel head unit composed of a slide base and a wheel head is mounted on a rear upper portion of the bed. A coolant collecting vent which takes a rectangular shape as viewed from above vertically extends in the bed and opens to the upper surface of the bed to cover an area that extends from under the workpiece on the workpiece support device to under the forward portion of the wheel head unit. A horizontal vent is provided in the bed to open to the rear surface of the bed and to communicate with the collecting vent. A coolant supply device is inserted at a part thereof into the horizontal vent from the rear surface of the bed to extend an inlet opening into the collecting vent.

Abstract: Systems and methods for beveling microfeature workpiece edges are disclosed. A system in accordance with one embodiment is configured to remove material from a microfeature workpiece having a first face, a second face facing opposite from the first face, an edge surface between the first and second faces, and an edge at a juncture between the edge surface and one of the first and second faces. The system can include a carrier positioned to carry the workpiece with the first and second faces generally normal to an axis, and a first polishing pad having a support surface and a polishing surface facing generally away from the support surface. The polishing surface can have a first shape with at least one portion oriented at an acute angle relative to the axis and the support surface to remove material from the edge of the workpiece.

Abstract: A rotation axis of a work spindle and a rotation axis of a spindle primary-axis portion are rotated relative to each other and feeding of a work-piece to a tool is accordingly adjusted, whereby warpage of the tool in accordance with a change in machining condition is corrected. A revolution volume of the relative rotation is compared and calculated in process based on data entered in advance, a result of measurement by a displacement sensor and information such as a machining position, and controlled in real time until the end of machining. The relative rotation is driven by an actuator such as a piezoelectric element, at a resolution even as fine as in seconds. The data entered in advance can be sequentially updated in accordance with monitoring of a processed product.

Abstract: A buffing head (34) includes a rotary element (36) for retaining an optical disc (20) and causing the disc (20) to rotate at a first speed. A buffing element (38) contacts a work surface (30) of the optical disc (20), and rotation of the disc (20) enables corresponding movement of the buffing element (38). A restrictor (40), in communication with the buffing element (38), restricts movement of the buffing element (38) so that the buffing element (38) moves at a second speed to recondition the work surface (30), the second speed being slower than the first speed. The buffing head (34) further includes a well (86) surrounding the buffing element (38) and containing a fluid (88). Movement of the buffing element (38) causes the buffing element (38) to be immersed into the fluid (88) and to be returned into contact with the work surface (30).

Abstract: A grinding system for grinding feedstock includes a transport apparatus, a grinding apparatus, and a controller. The transport apparatus continuously transports feedstock of an arbitrarily long length at a desired feed rate, and the grinding apparatus grinds the feedstock transported by the transport apparatus. The controller controls a grinding position of the grinding apparatus and a longitudinal position of the feedstock during grinding to be coordinated with each other.

Abstract: Disclosed is a turning tool for cutting circumferential grooves into a surface of a polishing pad formed of a resin material and utilized for polishing semiconductor devices. The turning tool comprising a cutting part arranged to have a tooth width within a range of 0.005-1.0 mm, a wedge angle within a range of 15-35 degrees, and a front clearance angle within a range of 65-45 degrees. A polishing pad effectively formed by using the turning tool, and an apparatus and a method of producing such a polishing pad by utilizing the turning tool are also disclosed.

Abstract: A centerless grinder 1 according to the present invention comprises a bed 108, a grinding wheel spindle stock 101, a regulating wheel spindle stock 102, a work rest 103, and the like. The grinding wheel spindle stock 101 and the regulating wheel spindle stock 102 are respectively moved toward and away from each other by feed devices 10, 10. The feed devices 10, 10 respectively comprise feed screws 11, 11 each having one end fixed to the work rest 103. Nuts 12, 12 are respectively retained in the grinding wheel spindle stock 101 and the regulating wheel spindle stock 102 in threading engagement with the feed screws 11, 11 so that axial movements thereof along the feed screws 11 are restricted and rotational movements thereof about axes thereof are permitted. The nuts 12, 12 are respectively rotated by driving motors 15, 15.

Abstract: An apparatus for repairing the surface of the optical disc, which is used to repair a damaged area of the laser transparent surface of the optical disc. A rotary seat is rotatably disposed on the base seat. An upper cover is pivotally connected with the base seat for covering the same. A buffing roller has a buffing layer and is rotatably disposed on inner side of the upper cover and passes over the disc rest face. A driving mechanism is mounted between the rotary seat and the buffing roller. When rotating, the buffing roller buffs the laser transparent layer of the disc. At the same time, the rotary seat is driven to rotate, whereby the disc rested on the disc rest face thereof is simultaneously rotated.

Abstract: To provide a method of and an apparatus for grinding a brake pad in which inclined faces at both ends of the brake pad can be ground along a single route and no grinding limit quantity is generated whether the boundary lines are parallel with each other or not. The apparatus according to the present invention comprises: a fixing portion 11 for fixing a brake pad 3; a rotary whetstone 21 having a rotation axis parallel to a friction face 3a of the brake pad 3, a grinding face of which distance to the rotation axis increases gradually or in plurality of steps in one direction of the rotation axis, and another grinding face of which distance to the rotation axis decreases gradually or in plurality of steps in the one direction of the rotation axis; and a transporter 10 for moving one of the brake pad and the rotary whetstone in relation to each other in a intersecting direction to the rotation axis.

Abstract: To provide a grinding machine and a centering method for the centers thereof in which the requisite space for the center support rotating mechanism for a workpiece and the in-feed mechanism is reduced to facilitate miniaturization and in which it is easy to secure the space for the supply and discharge of the workpiece and sizing measurement. A motor built-in type main spindle retaining a rotary drive center and a motor built-in type tailstock spindle retaining a tailstock center are swiveled by in-feed means eccentrically supporting them, whereby the rotary drive center and the tailstock center make an in-feed motion with respect to a grinding wheel.

Abstract: The present invention relates to a process and control device to grind a knife shaft used in a machine intended for cutting sheets of materials into strips, for example, sheets of paper, plastic, plates of photosensitive film or any other material having the form of thin sheets. The process includes determining the actual differences of position of the knives of the knife shaft in relation to a theoretical position and then dividing these differences to cut the film strips by widths practically equal to one another, and determining the quantities of material to be eliminated by grinding for each knife. This process especially finds its principal application in the photographic industry, in particular on grinding machines for the knives of knife shafts equipping the film slitters.

Abstract: A machining controlling apparatus numerically controls a wheel spindle stock and a spindle apparatus, and performs the machining operation of a workpiece by a grinding wheel. When a power failure has been detected by a power-failure detecting unit, a grinding machine is stopped after the grinding wheel is retreated from the workpiece within a very short period until the controlling operation by the machining controlling apparatus becomes impossible.

Abstract: A precision drill sharpener and grinding wheel assembly is provided, as is a corresponding drill chuck for use with the drill sharpener, in which the drill sharpener includes a lever and spring clip alignment subassembly for properly positioning a drill in the drill chuck, and sharpening ports for sharpening the drill and splitting the drill tip, the sharpening ports being positioned such that a single grinding wheel assembly is used to both sharpen the drill and split the tip. The drill sharpener uses a small diameter grinding wheel operated at high speed to provide cutting rates comparable to large industrial sharpeners. The drill chuck is of short length, relative to most of the drills to be sharpened, and is open at the back end, enabling the manipulation of the drill by its shank relative to the drill chuck when disposed in the alignment subassembly.