The invention relates to a method for the multi-stage grinding of workpieces (20) made of hard mineral materials using a robot (10). To this end, the workpiece (20) is moved into a processing region (21) and measured and/or oriented there by the robot (10). The robot (10) comprises a grinding head (11) by way of which it then takes up a first abrasive (14) preferably from a storage container (30) and starts a first grinding process. After the first grinding process is complete, the robot (10) releases the first abrasive (14) again and then takes up a second abrasive (14), preferably from the same or some other storage container (30). Then the robot (10) starts a second grinding process, and after the latter is complete, releases the second abrasive (14) again. One or more further grinding processes may be provided, but the grinding method can also be finished after the second grinding process. If further grinding processes are provided, the robot (10) first of all takes up the respective abrasive (14), carries out the grinding process and releases the abrasive (14) again. After the final grinding process is complete, the workpiece (20) is removed from the processing region (21). Furthermore, the invention also comprises a plant (26) for carrying out the method and a stripping device (40), a storage container (30) and a vacuum table (50), by means of which the method can be carried out.

The invention relates to a method for the multi-stage grinding of workpieces (20) made of hard mineral materials using a robot (10). To this end, the workpiece (20) is moved into a processing region (21) and measured and/or oriented there by the robot (10). The robot (10) comprises a grinding head (11) by way of which it then takes up a first abrasive (14) preferably from a storage container (30) and starts a first grinding process. After the first grinding process is complete, the robot (10) releases the first abrasive (14) again and then takes up a second abrasive (14), preferably from the same or some other storage container (30). Then the robot (10) starts a second grinding process, and after the latter is complete, releases the second abrasive (14) again. One or more further grinding processes may be provided, but the grinding method can also be finished after the second grinding process. If further grinding processes are provided, the robot (10) first of all takes up the respective abrasive (14), carries out the grinding process and releases the abrasive (14) again. After the final grinding process is complete, the workpiece (20) is removed from the processing region (21). Furthermore, the invention also comprises a plant (26) for carrying out the method and a stripping device (40), a storage container (30) and a vacuum table (50), by means of which the method can be carried out.

A glass polishing apparatus includes a jig that holds a glass structure. The glass polishing apparatus includes a first flat portion, a second flat portion opposite to the first flat portion, and a curved portion connecting the first flat portion to the second flat portion. The jig and includes a first holding surface holding the first flat portion, a second holding surface disposed opposite to the first holding surface and holding the second flat portion, and a third holding surface connecting the first holding surface to the second holding surface and holding the curved portion. At least a portion of a roller unit having a cylindrical shape is inserted between the first flat portion and the second flat portion.

A sanding tool is adapted to be attached to an existing wood board molding machine. The sanding tool provides a rotating sanding drum which removes imperfections from the profile of the molding as it exits the molding machine. The sanding drum is height adjustable and is powered by an electric motor.

A device for polishing of a multi-surface workpiece is described. The device includes a base and a vertical motion platform that moves along two support rods, which carries a motor that drives a rotating shaft. The support rods extend from said base. A polishing tool is attached to the motor shaft. The workpiece being polished is placed on a linear motion stage during the polishing process.

A grinding method for grinding a workpiece includes a first grinding step of grinding the workpiece in such a manner that an outer circumferential part of the workpiece becomes thinner than a central part of the workpiece, a measurement step of measuring the thickness of the workpiece at the outer circumferential part, and a second grinding step of grinding the workpiece. In the second grinding step, the grinding is started from the central part of the workpiece and the grinding is ended when the workpiece reaches a finished thickness decided based on the thickness of the workpiece at the outer circumferential part measured in the measurement step.

There is furnished a working tool comprising a rotating shaft (6), a polishing plate (3) mounted on the shaft, an expandable elastomer sheet (4) attached to the polishing plate (3), an abrasive cloth (5) attached to the elastomer sheet (4), and means for pressing the elastomer sheet (4) at a plurality of positions under respective predetermined different pressures such that a lower surface of the abrasive cloth (5) is deformed to the desired inverted convex shape in accordance with differences of pressing force applied to the elastomer sheet (4) at the plurality of positions. A substrate is produced by bringing the inverted convexly deformed surface of the abrasive cloth (5) in contact with a substrate stock, and rotating and moving the working tool for polishing the substrate over a selected area.

A flat sanding structure contains: a body including a first and a second wood planing zones. The second wooding zone has two supporting shelves and two grinding wheels. Two supports are connected with two first fixing pieces and two second fixing pieces, a third holding plate is fixed between the two grinding wheels and the two supporting shelves. Said each first fixing piece has a first through orifice and two elongated orifices, a first connecting shaft has a threaded orifice, a first holder is defined between the two first fixing pieces, and two posts are inserted into the two first fixing pieces and connected with the first holder. The first holder has a tab and an elongated hole. A second connecting shaft is inserted into each second fixing piece, a second holder is defined between the two second fixing pieces, and one of the two supports has a column.

A flat sanding structure contains: a body including a first and a second wood planing zones. The second wooding zone has two supporting shelves and two grinding wheels. Two supports are connected with two first fixing pieces and two second fixing pieces, a third holding plate is fixed between the two grinding wheels and the two supporting shelves. Said each first fixing piece has a first through orifice and two elongated orifices, a first connecting shaft has a threaded orifice, a first holder is defined between the two first fixing pieces, and two posts are inserted into the two first fixing pieces and connected with the first holder. The first holder has a tab and an elongated hole. A second connecting shaft is inserted into each second fixing piece, a second holder is defined between the two second fixing pieces, and one of the two supports has a column.

Multiple holding surfaces of a chuck table are disposed in such a manner that the heights thereof from a reference surface are in increasing order along a first direction parallel to each of them. Thus, in a case of using this chuck table, creep-feed grinding for workpieces each held by a respective one of the multiple holding surfaces can be executed in states in which a grinding unit is positioned at different heights. In this case, the workpiece for which the creep-feed grinding has been executed is located on the lower side as viewed from the grinding unit when another workpiece is ground. Due to this, in this creep-feed grinding, a specific workpiece can be prevented from being ground twice.