Abstract: A scarifier system for cutting channels into a ground surface according to a chosen design pattern, comprising a scarifier machine, and a guide system for guiding the scarifier machine on a tracked trail. The guide system for guiding the scarifier machine on a tracked trail can be, for instance, a sliding bracket clasping a guide rail or a rolling carriage having one or more pairs of wheels gripping a guide rail. A method of remodeling a ground surface using the scarifier system comprises the steps of planning a design pattern to remodel the ground surface and to mark the ground surface according to the chosen design pattern. The guide rail is installed on the ground surface according to the chosen design pattern and the scarifier machine is placed on the guide rail in a manner that the scarifier machine can slide along the guide rail to cut a channel into the ground surface.

Abstract: A cart for carrying a cut-off saw having a saw blade. The cart includes a frame with upper and lower portions, a wheel arm pivotably coupled to the lower portion about a first axis, and a rear wheel assembly coaxial with the first axis and coupled to the frame and the wheel arm. The cart includes a front wheel coupled to an end of the wheel arm opposite the rear wheel assembly, an adjustment lever pivotably coupled to the upper portion about a second axis, and a link having a first end pivotably coupled to the adjustment lever and spaced from the second axis, and a second end pivotably coupled to the wheel arm between the first axis and the front wheel. Pivoting the adjustment lever about the second axis pivots the wheel arm about the first axis to adjust a vertical position of the front wheel relative to the upper portion.

Abstract: A wafer processing method includes a pattern region detecting step, an evaluation region setting step, and an evaluation region deploying step. The pattern region detecting step is a step of detecting a period and positional information in which a substantially identical image appears in an imaged image and detecting a pattern region corresponding to one period. The evaluation region setting step is a step of detecting a position in which no metallic pattern is formed on planned dividing lines and setting the position as an evaluation region for evaluating quality of a processed groove. The evaluation region deploying step is a step of recording the position of the evaluation region in the pattern region and deploying the evaluation region at similar positions in different pattern regions.

Abstract: A scarifier system for cutting channels into a ground surface according to a chosen design pattern, comprising a scarifier machine, and a guide system for guiding the scarifier machine on a tracked trail. The guide system for guiding the scarifier machine on a tracked trail can be, for instance, a sliding bracket clasping a guide rail or a rolling carriage having one or more pairs of wheels gripping a guide rail. A method of remodeling a ground surface using the scarifier system comprises the steps of planning a design pattern to remodel the ground surface and to mark the ground surface according to the chosen design pattern. The guide rail is installed on the ground surface according to the chosen design pattern and the scarifier machine is placed on the guide rail in a manner that the scarifier machine can slide along the guide rail to cut a channel into the ground surface.

Abstract: A track system on which a skater dolly can roll, comprising one or more pairs of rails and one or more rail clamps. Each rail clamp supports one or two pairs of rails. Rails held side-by-side are parallel to each other. Rail clamps can also secure two rails in end-to-end configuration. The distance between rails can be about 5/16 of an inch. The track system can include a skater dolly, the load-bearing wheels of which are angled 20-30 degrees away from vertical to provide clearance past the rail clamps. The skater also has stabilizing wheels that are approximately perpendicular to the load-bearing wheels, and which secure the skater to the rails when the skater is in a non-upright e.g. upside-down orientation. The system can include a motor pulley system that moves the skater along the rails.

Abstract: A self-propelled electric concrete saw having at least two electric motors. A first electric motor of the concrete saw is powered by an external power supply and can power both a saw blade and a drive system. A second electric motor of the concrete saw is powered by a rechargeable battery and can power the drive system. The concrete saw can be maneuvered by using the second electric motor with or without the concrete saw being connected to the external power supply.

Abstract: A leg cutting system with a leg support clamp 2 with a height for maintaining a structural integrity of the leg 1 during and after the leg 1 is cut. The system includes at least two leg support clamp parts joined in at least one clamp structure joint 11 with releasable mechanical fasteners for joining or releasing the at least two leg support clamp parts along the at least one clamp structure joint. A wire saw 6 with a wire saw support frame 7 and longitudinal saw tracks 16 for longitudinal displacement of the sawing wire along said longitudinal saw tracks 16 can be fixed to the leg support clamp. A wire replacement unit 9 with a plurality of sawing wires with a joint allowing the wires to be joined is located adjacent the wire saw. The embodiment(s) furthermore relates to a leg support clamp.

Abstract: A method for controlling a device system (10) during the cutting of a workpiece (18) along a cutting line (43) up to a first end point (E1) using a saw head (12) that can be moved on a guide rail (11) along an advancing direction (26), whereby the saw head (12) is arranged on the guide rail (11) in a starting position (X0), and a first partial length (L1) extending from the starting position (X0) to the first end point (E1) of the cutting line (43) is entered.

Abstract: A pile cutter, suitable for cutting of steel reinforced concrete piles, has a frame with a pile receiving area and a generally U-shaped track around the pile receiving area. A single saw blade, for example a diamond tipped rotary saw blade, is carried on a saw blade carriage assembly, which is movably mounted on the U-shaped track. The dimensions of the various components are such that the saw blade cuts past a center line through the pile receiving area. By moving the saw blade carriage assembly first to one end of the U-shaped track, then to the other end, the pile can be completely severed.

Abstract: A track system on which a skater dolly can roll, comprising one or more pairs of rails and one or more rail clamps. Each rail clamp supports one or two pairs of rails. Rails held side-by-side are parallel to each other. Rail clamps can also secure two rails in end-to-end configuration. The distance between rails can be about 5/16 of an inch. The track system can include a skater dolly, the load-bearing wheels of which are angled 20-30 degrees away from vertical to provide clearance past the rail clamps. The skater also has stabilizing wheels that are approximately perpendicular to the load-bearing wheels, and which secure the skater to the rails when the skater is in a non-upright e.g. upside-down orientation. The system can include a motor pulley system that moves the skater along the rails.

Abstract: A machine (12) for cutting slabs, comprises a workpiece support bench (14) adapted to support at least one slab, and cutting means for automated cutting of the slab on the bench. The cutting means comprise two lateral support structures (16, 18). A first beam (20) is adapted to move along said lateral support structures (16, 18). The first beam (20) is adapted to slide on the lateral support structures (16, 18) via its ends (22, 24) and guiding means (25, 26) provided on the lateral support structures (16, 18). The first beam (20) is provided with a first carriage (28) adapted to be moved along the first beam (20). A first sleeve (30) adapted to be moved towards or away from the workpiece support bench (14) is provided on the first carriage (28). A first machining head (32) comprising a first cutting spindle (34) is provided on the first sleeve (30). A second beam (201) is adapted to move along the lateral support structures (16, 18).

Abstract: A sawmill 1 has an operator end 6, a pair of end frames 2, a track 3 elevated by and extending from at least one end frame to the other, a carriage moveable 4 to carry a saw 5 along at least part of the track, flip elements able to move the saw from a horizontal cutting orientation to a vertical cutting orientation, and a relocatable stopper 13 associated with the track. The carriage 4 can be driven away from the operator end 16 with the saw 5 in the horizontal cutting orientation to contact the stopper 13 when the carriage, this resulting in the flip elements automatically moving the saw 4 into the vertical cutting orientation.

Abstract: The present invention relates to a device (10) and a method for removing contaminated material from a wall, the device (10) comprising suction plates (26) which fix a support system (13) of the device (10) to the wall by means of negative pressure, and a first rotating tool (14) that has impact cutters (16) in the circumferential direction. Disc-shaped saw blades (20) are provided in a second rotating tool (18) mounted upstream of the first rotating tool (14) in the working direction.

Abstract: The present invention is a new and improved coping saw for performing a coping operation. The saw is operable in a first orientation for performing a first cut and in a second orientation for performing a coping second cut and comprises a handle having one or more power switches for activating and deactivating the drive system in both the first orientation and in the second orientation.

Abstract: A concrete saw for cutting a concrete slab incorporating a rollable trolley having upper, lateral, front, and rear ends; an engine fixedly attached to the rollable trolley, the engine having a rotary power output; a blade connected operatively to the engine's rotary power output for, upon movement of the first rollable trolley over the concrete slab, slotting said slab and drawing concrete cuttings therefrom; a shroud fixedly attached to the first rollable trolley, the shroud having a plurality of side walls, a floor, and a ceiling, the shroud housing the blade, and defining a dust containment space; a dust conveyor having input and output ends, the dust conveyor's input end being positioned within the shroud's dust containment space; power transfer pulleys connected operatively to the dust conveyor for conveying the concrete cuttings from the dust conveyor's input end to the output end; and a receptacle under the output end.

Abstract: A device for cutting granite or other hard materials includes a cutter disc (6) for making cut-outs of rectilinear or curved shape. The device includes a machining head (5) simultaneously carrying the cutter disc (6) and jigsaw elements (7) for making cuts in closed corners. The device may further include manipulator sucker elements (8) for moving parts to be cut or parts to be cut out.

Abstract: A hybrid concrete saw includes a saw blade, an internal combustion engine having an output shaft operably connected to the saw blade, and an electric motor connectable to a battery for receiving power therefrom and having an output shaft operably connected to the saw blade. A transmission is connected to the output shaft of each of the engine and the electric motor and the saw blade. A clutch selectively decouples one of the engine and the electric motor from the transmission. A controller controls operation of the engine and the electric motor. The concrete saw is operable in a first mode where the saw blade is driven solely by the engine, a second mode where the saw blade is driven solely by the electric motor, and a third mode where the saw blade is driven by both the engine and the electric motor.

Abstract: Presented is a concrete saw for sawing into concrete surfaces to provide expansion slots or joints. The concrete saw has powered front wheels and may optionally have powered rear wheels, so that with improved traction the full potential of the motor can be utilized in faster cutting of concrete.

Abstract: A device (20) for adjusting the blade guard holder (17) arranged on the saw arm (3) of a wall saw (1), having a coupling element (25) is provided, whereby a first end of the coupling element (25) is joined to the blade guard holder (17), and, in a locked state, a second end is joined to the saw arm (3).

Abstract: A cutting apparatus for cutting corner pieces formed of stone or other materials for use as building faces or for cutting flat pieces is disclosed herein. The cutting apparatus includes a frame with a first and a second conveyor operatively attached to the frame. The first and the second conveyors are configured to carry a workpiece from a first end of the frame to the second end of the frame. The first conveyor is disposed at an angle of about 45 degrees to a ground surface supporting the cutting apparatus. The second conveyor is disposed at an angle of about 45 degrees to the ground surface supporting the cutting apparatus, wherein the second conveyor is positioned perpendicularly to the first conveyor so as to form a V-shaped channel therewith.

Abstract: A tile rebate cutting apparatus has a guide member, which may be formed by a spirit level, forming a linear guide for a rebate cutting tool, the rebate cutting tool incorporating at least one cutting device, the rebate cutting tool being adapted to engage with said guide member to move along a predetermined line determined by the position of the guide member to enable a cut for a rebate to be made in a ceiling tile.

Abstract: A corner jig for a masonry saw for fabricating a cut in a masonry unit (e.g., brick) such as to form a corner brick veneer may have a push block wherein its height is substantially equal to a length of a brick to be formed into the corner brick veneer. A lateral position of a cut guide is adjustable to regulate a thickness of the corner brick veneer. A height of the cut guide may also be substantially equal in length of the bring to be formed into the corner brick veneer. Once the cut guide and push block are mounted to the masonry saw, the brick is positioned within the corner jig and a first cut is made. The user's hands are out of the way so that the cut can be made safely without harming the operator. The brick is repositioned and a second cut is made in the brick to finish off the corner brick veneer. Once again, the user's hands are out of the way for safe operation of the masonry saw.

Abstract: A hybrid concrete saw includes a saw blade, an internal combustion engine having an output shaft operably connected to the saw blade, and an electric motor connectable to a battery for receiving power therefrom and having an output shaft operably connected to the saw blade. A transmission is connected to the output shaft of each of the engine and the electric motor and the saw blade. A clutch selectively decouples one of the engine and the electric motor from the transmission. A controller controls operation of the engine and the electric motor. The concrete saw is operable in a first mode where the saw blade is driven solely by the engine, a second mode where the saw blade is driven solely by the electric motor, and a third mode where the saw blade is driven by both the engine and the electric motor.

Abstract: Systems and methods of transferring loads between adjacent cast-in-place slabs, such as concrete slabs, and for accurately positioning dowels between adjacent sections of slabs are provided. A generally planar plate-type dowel is used which may be positioned within a cutaway in a preexisting slab of concrete. The dowel is shaped to generally conform to the shape of the cutaway, which is made by a saw blade. Once the dowel is positioned within the preexisting slab, a new slab is poured adjacent the preexisting slab. Rubber seals are included on the edges of the dowels to provide spacing or a gap between the dowel and the preexisting slab to allow for lateral independent movement of the adjacent slabs, and to prevent concrete from the newly poured second slab from entering into the gap. A saw unit for making a generally planar cut horizontally into an edge of a hardened concrete slab is also provided.

Abstract: A cutting or sawing machine (1) comprising a machine body (3), at least one disc shaped, rotatable tool (16a, 16b), an elongated tool carrier (14) having the substantial shape of a flat bar having a front end and a rear end, two opposite broad sides and two opposite edge sides, said rear end being connected to the machine body. The tool carrier comprises at least two elongated side walls (24, 25), a first elongated side wall (24) on one broad side of the tool carrier, a second elongated side wall (25) on the opposite broad side, said first and second side walls being essentially parallel with each other, and the front part of either one of the side walls or of a possible central elongated member (25) between the first and second side walls is provided with a bearing hole (28a) intended to carry a bearing of sliding contact type or of rolling contact type, i.e.

Abstract: A tile cutting machine includes a tub for receiving water and a tile supporting surface for supporting thereon a tile to be cut. A cutting head assembly is positioned above the tile supporting surface and includes a motor driven blade. A tile hold down mechanism extends downwardly from the cutting head assembly to engage the tile and apply downward pressure thereto to hold the tile in place during the cutting process. The tile hold down mechanism may take the form of flexible hold down feet, downwardly biased rollers and/or bristle skirts. The tile supporting surface may be fabricated of a high friction material and include a plurality of nubs to cooperate with the hold down mechanism to hold the tile stationary with respect to the supporting surface during the cutting process. The tile cutting machine provides for a method of cutting tile where a user does not have to hold the tile with their hands during the cutting operation.

Abstract: Systems and methods are provided for cutting silicon into seed rods for use in a chemical vapor deposition polysilicon reactor. A method includes cutting the silicon ingot with saw blades into silicon slabs, rotating the silicon slabs, and cutting the silicon slabs into smaller-sized silicon seed rods for use in the chemical vapor deposition polysilicon reactor.

Abstract: Presented is a concrete saw for sawing into concrete surfaces to provide expansion slots or joints. The concrete saw has powered front wheels and may optionally have powered front wheels, so that with improved traction the full potential of the motor can be utilized in faster cutting of concrete.

Abstract: A skid plate for a concrete saw is integrally cast having two end mounting portions and a middle portion with a slot in the middle portion. A horizontal slot in a leading end mounting portion cooperates and a vertical slot in the trailing end portion releasably engage pins on the saw to allow the skid plate to be easily fastened to and removed from the saw. A spring loaded latch mechanism holds the pins in the slots.

Abstract: A corner jig for a masonry saw for fabricating a cut in a masonry unit (e.g., brick) such as to form a corner brick veneer may have a push block wherein its height is substantially equal to a length of a brick to be formed into the corner brick veneer. A lateral position of a cut guide is adjustable to regulate a thickness of the corner brick veneer. A height of the cut guide may also be substantially equal in length of the bring to be formed into the corner brick veneer. Once the cut guide and push block are mounted to the masonry saw, the brick is positioned within the corner jig and a first cut is made. The user's hands are out of the way so that the cut can be made safely without harming the operator. The brick is repositioned and a second cut is made in the brick to finish off the corner brick veneer. Once again, the user's hands are out of the way for safe operation of the masonry saw.

Abstract: A thin veneer stone saw and related methods are provided. The thin veneer stone saw includes one or more circular saw blades. In an embodiment, two circular saw blades are arranged such that a masonry block, such as stone, may be sawed completely through in a single pass through the thin veneer stone saw. The stone may be delivered to, and processed through, the circular saw blades by a conveyor system. One of the circular saw blades may be centered below the top surface of the conveyor and protrude through a gap between two sections of the conveyor system. The other circular saw blade may be positioned entirely above the top surface of the conveyor system. The thin veneer stone saw may be operable to produce thin veneer stones in a variety of widths. The thin veneer stones may be used to form facade for a structure.

Abstract: A sawing strip for fixing a substantially cylindrical workpiece when cutting off slices from this workpiece with a wire saw has a first face, which is concavely curved perpendicular to its longitudinal direction for connecting to the workpiece, a second face opposite the first face for connecting to a mounting plate, and two side faces which connect the first face and the second face, two edges of the sawing strip at which the side faces meet the first face at a distance a from each other, an imaginary line on the first face marking its minimum distance d from the second face, the side faces being at a distance b, measured at the height of the line and perpendicular to the distance d, wherein the distance b is less than the distance a. The sawing strip is useful for decreasing waviness of wafers cut from a cylindrical workpiece using the sawing strip.

Abstract: A tile cutting machine includes a tub for receiving water and a tile to be cut therein. A cutting head assembly having a motor driven blade is positioned above a tile supporting surface located in the tub and is movable with respect thereto. A laser projects a line of light from the cutting head assembly down onto the tile supporting surface to provide a visual representation of a cutting path of the blade. A scale permits measurement of a tile to be cut. The laser may be used with the scale to allow a user to quickly determine cutting widths without the need to manually mark the object to be cut. A light source, such as an LED, may be incorporated in the cutting head to illuminate an interior of the tub during operation of the tile cutting machine.

Abstract: A skid plate for a concrete saw is integrally cast having two end mounting portions and a middle portion with a slot in the middle portion. A horizontal slot in a leading end mounting portion cooperates and a vertical slot in the trailing end portion releasably engage pins on the saw to allow the skid plate to be easily fastened to and removed from the saw. A spring loaded latch mechanism holds the pins in the slots.

Abstract: A skid plate for a concrete saw is integrally cast having two end mounting portions and a middle portion with a slot in the middle portion. A horizontal slot in a leading end mounting portion cooperates and a vertical slot in the trailing end portion releasably engage pins on the saw to allow the skid plate to be easily fastened to and removed from the saw. A spring loaded latch mechanism holds the pins in the slots.

Abstract: A saw skid plate shield including a shield plate body defining a leading edge and a trailing edge and a mechanism such as edge rails for attaching the shield plate body to the skid plate. Both the leading and trailing edges of the skid plate body are beveled and/or rounded to divert debris.

Abstract: A wire saw assembly having a slide frame, support frames, a tensioning carriage, and a diamond wire cutting saw. The slide frame has a mounting plate attached slidably to mounting plate rails. The mounting plate engages a lead screw so that rotation of the lead screw moves the mounting plate along the mounting plate rails towards or away from a work piece. Two support frames are attached to the mounting plate. Each support frame has two drive wheels and a hydraulic motor for each drive wheel. A hydraulic fluid flow divider distributes hydraulic fluid evenly to each hydraulic motor so that the drive wheels operate in unison. The tensioning carriage has a slide plate with an idler pulley attached slidably to the slide plate rails. The slide plate engages a threaded rod so that rotation of the threaded rod moves the slide plate and idler pulley along the slide plate rails to increase or decrease the tension in the wire saw.

Abstract: A thin veneer stone saw and related methods are provided. The thin veneer stone saw includes one or more circular saw blades. In an embodiment, two circular saw blades are arranged such that a masonry block, such as stone, may be sawed completely through in a single pass through the thin veneer stone saw. The stone may be delivered to, and processed through, the circular saw blades by a conveyor system. One of the circular saw blades may be centered below the top surface of the conveyor and protrude through a gap between two sections of the conveyor system. The other circular saw blade may be positioned entirely above the top surface of the conveyor system. The thin veneer stone saw may be operable to produce thin veneer stones in a variety of widths. The thin veneer stones may be used to form facade for a structure.

Abstract: A repair assembly for the skid plate of a circular saw and its associated method of repair. If a circular saw has a skid plate that is worn to a point where it needs replacement, this repair assembly is used to reinforce the worn skid plate so it can again be used. The repair assembly includes a flat plate structure having a sort extension and a long extension protruding from different sides. The long extension and the short extension mount directly onto the worn skid plate. The flat plate structure therefore covers the wear surfaces of the worn skid plate, therein providing new wear surfaces. The repair assembly attached over the worn skid plate so the worn skid plate does not have to be removed.

Abstract: A machine is provided for cutting tiles and similar objects of various materials. The tile cutting machine includes a tub having at least one sidewall and a bottom for holding water. A holding mat is received within the tub that includes a number of nubs extending upwardly therefrom for supporting a tile to be cut using the tile cutting machine. A cutting head assembly movable relative to the tub includes a blade and a motor for powering the blade. The blade is positionable to a depth that allows full penetration through the tile and into contact with water received within the tub, thereby providing lubrication, cooling, and dust control while the tile is being cut.

Abstract: A platform minute adjustment, expansion and collection device for a stone cutter includes a water tank supported by a pair of racks, a pair of guide rods spacedly bridged on the racks, a first water collection plate and a second water collection plate, both of which are slantly disposed to a front rack, a platform having a pair of rotors on the lower side thereof and slidably engaged on the inner sides of the guide rod. The platform has a pair of expansion plates for enlarging its size and for cutting a large-sized working piece, and two minute adjusting devices mounted on the tops of the racks for displacing the platform slightly, such that the sawdust may be stopped scattering all over the working place.

Abstract: Semiconductor wafer sawing systems and methods are described in which a wafer may be secured in a sawing position having a surface exposed to incur sawing with at least a portion of the exposed wafer surface positioned below the center of gravity of the wafer such that prevailing force of gravity may be used to assist in the removal of contaminants from the wafer.

Abstract: The present invention provides a forward motion speed control system for a self-propelled concrete saw, a self-propelled concrete saw equipped with a forward motion speed control system and a method of controlling the forward motion speed of a concrete saw during a cutting or scoring operation. In one preferred embodiment of the invention, the forward motion speed control system senses and monitors the speed of a power plant transmitting rotational energy to a saw blade and adjusts the forward motion speed of the self-propelled concrete saw to maximize the forward motion speed of the self-propelled concrete saw while maintaining the speed of the power plant in a peak operational range.

Abstract: A wall saw accessory is provided for an aerial work platform, where a wall saw is movably affixed on a track secured to a wall to be sawed. The accessory includes a saw/track manipulator fixable to the aerial work platform. The saw/track manipulator movably supports the track and saw and enables positioning of the saw and track to and from a working position. A hydraulic power source is coupled with a water supply to provide hydraulic power and coolant flow to the wall saw. In one arrangement, the accessory additionally incorporates an onboard pressure washer, which serves to streamline the process and maintain a clean work area. The accessory may be attached to a lift vehicle including a chassis supporting an onboard water supply.

Abstract: The invention relates to a tool, in particular an abrasive cutting-off machine (1), having a cutting tool (7) and a protective hood (8), partly covering the cutting tool (7) and [lacuna] in its relative position to the cutting tool (7), and an adjusting handle arranged on the outside of the protective hood (8), by which the position of the protective hood (8) can be adjusted by the user, and an injection device for water, which is arranged on the protective hood (8) and directed towards the cutting tool (7) and by which flying dust and chips arising during the cutting operation can be averted, the injection device and the adjusting handle being comprised by an injection and adjusting handle (6).

Abstract: A cutting apparatus that positions a wire saw driving device movably and appropriately at the desired site by freely moving an arm of a backhoe provided with a boom, which arm carries the wire saw driving device and is turnable and movable in upward, downward, leftward, rightward, forward, and backward directions, thus enabling cutting at sites too narrow in which to use a conventional machine. Cutting by use of a wire saw and by use of a disk blade can be alternately performed as needed.

Abstract: A system for supporting and positioning a portable stone-cutting track saw to make a mitered cut in a piece stone-type material is described. The system includes lightweight support fixtures that clamp to the stone and that are configured to support rails of the portable track saw system at a desired angle, for example, approximately 45°, or at a variety of angles, with respect to the stone. In one preferred embodiment, two end support fixtures clamp on to ends of the stone and are configured to support track saw rails at an angle of 46° with respect to a horizontal surface of the stone. The system may also comprise one or more types of inline support fixtures for supporting a central portion of the rails when the rails are very long or use of end support fixtures is inconvenient, and a depth-stop mechanism for enhancing repeatability of the mitered cuts.

Abstract: A skid plate for a concrete saw is integrally cast having two end mounting portions and a middle portion with a slot in the middle portion. A horizontal slot in a leading end mounting portion cooperates and a vertical slot in the trailing end portion releasably engage pins on the saw to allow the skid plate to be easily fastened to and removed from the saw. A spring loaded latch mechanism holds the pins in the slots.

Abstract: A structural improvement in a portable stone cutter includes a box like rectangular base being separated in the center by a partition into a water sink and motor compartment abutting a plain surface, to which a switch and piece of electric wire are disposed. The motor has an axis inserted into the water sink via a through hole in the partition and connected with a saw blade which is partially submerged in the water. A rectangular lid covering the top of the base includes a plate on the left side having a pair of stepped stopping surfaces spacedly formed on the top and an opening on the right side on the top of the water sink. A pair of first and second grille working plates respectively pivot to the middle and the right edge of the lid so that the working plates are capable of lifting and forming a certain angle relative to the plane surface of the lid.

Abstract: Two imaging equipment are provided at a pair of cutting blade units, and the two imaging equipment image patterns at first positions in proximity to the center of a wafer at the same time. A controller drives drive mechanisms to align the wafer in such a way that current image patterns at the first positions can match with a reference pattern at the first positions. Then, the two imaging equipment are moved to positions for imaging patterns at second positions at the outer circumference of the wafer to image the patterns at the second positions. The controller drives the drive mecha- nisms to align the wafer in such a way that current image patterns at the second positions can match with a reference pattern at the second positions.