A method dresses one polishing cloth or two polishing pads simultaneously, in which a polishing cloth has been applied to a polishing plate, with at least one dresser (4), which is equipped with at least one dressing element (8), this at least one dressing element (8) being in contact with the at least one polishing cloth (11, 12) to be dressed, wherein the at least one polishing plate (21, 22) is rotated with a relative rotational speed and the at least one dresser (4) is rotated with a relative rotational speed and at least two different combinations of directions of rotation of the two pairs of polishing plates (21, 22) and pin wheels (31, 32) are executed during the simultaneous dressing of two polishing pads (11, 12) or during the dressing of one polishing cloth (11) of the polishing plate (21) and of the at least one dresser (4).

A method dresses one polishing cloth or two polishing pads simultaneously, in which a polishing cloth has been applied to a polishing plate, with at least one dresser (4), which is equipped with at least one dressing element (8), this at least one dressing element (8) being in contact with the at least one polishing cloth (11, 12) to be dressed, wherein the at least one polishing plate (21, 22) is rotated with a relative rotational speed and the at least one dresser (4) is rotated with a relative rotational speed and at least two different combinations of directions of rotation of the two pairs of polishing plates (21, 22) and pin wheels (31, 32) are executed during the simultaneous dressing of two polishing pads (11, 12) or during the dressing of one polishing cloth (11) of the polishing plate (21) and of the at least one dresser (4).

A method, which can accurately determine in a short time a relationship between a load of a dresser and a pressure of a gas supplied to an air cylinder, is disclosed. The method includes determining a first contact point where a load measurement device is brought into contact with a polishing table, calculating a relational expression composed to a quadratic function showing a relationship between a measured load and a measured pressure, determining a second contact point where the dresser is brought into contact with a polishing surface of a polishing pad, calculating an amount of correction from the pressure of the gas at the first contact point and the pressure of the gas at the second contact point, and correcting the relational expression based on the calculated amount of correction.

A method, which can accurately determine in a short time a relationship between a load of a dresser and a pressure of a gas supplied to an air cylinder, is disclosed. The method includes determining a first contact point where a load measurement device is brought into contact with a polishing table, calculating a relational expression composed to a quadratic function showing a relationship between a measured load and a measured pressure, determining a second contact point where the dresser is brought into contact with a polishing surface of a polishing pad, calculating an amount of correction from the pressure of the gas at the first contact point and the pressure of the gas at the second contact point, and correcting the relational expression based on the calculated amount of correction.

Method and systems are disclosed for plunge dressing of a spiral bevel gear-grinding wheel. The method includes providing a dressing roll for plunge dressing of a spiral bevel gear-grinding wheel, the dressing roll including: a body portion having an axis of rotation, a radial extent about said axis, and an axial extent, the body portion integrally comprising: a base portion configured for connection to a drive motor, a first cutting surface, and a second cutting surface, and plunge dressing of the spiral bevel gear-grinding wheel based upon the interference calculation. Some embodiments include determining whether interference will occur between the grinding wheel and the dressing roll before plunge dressing.

Method and systems are disclosed for plunge dressing of a spiral bevel gear-grinding wheel. The method includes providing a dressing roll for plunge dressing of a spiral bevel gear-grinding wheel, the dressing roll including: a body portion having an axis of rotation, a radial extent about said axis, and an axial extent, the body portion integrally comprising: a base portion configured for connection to a drive motor, a first cutting surface, and a second cutting surface, and plunge dressing of the spiral bevel gear-grinding wheel based upon the interference calculation. Some embodiments include determining whether interference will occur between the grinding wheel and the dressing roll before plunge dressing.

A dressing board having, on a surface, a two-dimensional code including information relating to properties of the dressing board and a barcode including identification information associated with the information relating to the properties is provided. Furthermore, there is provided a cutting apparatus including a determining part that determines whether or not the properties of the dressing board read out from an information registration part based on the identification information match the kind of dressing board suitable for dressing of a cutting blade.

When a work W rotates counterclockwise about an axis O.sub.w and is subjected to infeed grinding by a regulating wheel (1) which rotates clockwise about an axis O.sub.1 and a grinding wheel (2) which rotates clockwise about an axis O.sub.2, a load F acting on a blade (4), a load acting on the work W supported by the blade (4), and a load operating position y in the blade (4) at any given time are measured by a controller (20) based on the outputs of a first stress sensor S.sub.1 and a second stress sensor S.sub.2 and according to the correlation information stored in a storage device. If the component of a specified frequency extracted by performing frequency analysis of the time series of the load exceeds a threshold value, then designation processing is carried out to reduce the component of the designated frequency to the threshold value or less.

When a work W rotates counterclockwise about an axis O.sub.w and is subjected to infeed grinding by a regulating wheel (1) which rotates clockwise about an axis O.sub.1 and a grinding wheel (2) which rotates clockwise about an axis O.sub.2, a load F acting on a blade (4), a load acting on the work W supported by the blade (4), and a load operating position y in the blade (4) at any given time are measured by a controller (20) based on the outputs of a first stress sensor S.sub.1 and a second stress sensor S.sub.2 and according to the correlation information stored in a storage device. If the component of a specified frequency extracted by performing frequency analysis of the time series of the load exceeds a threshold value, then designation processing is carried out to reduce the component of the designated frequency to the threshold value or less.

A height of an upper surface of a sub-chuck table is measured by a holding surface measuring unit in contact with the upper surface of the sub-chuck table. A height of a holding surface of a chuck table is measured by an upper surface height measuring unit in contact with the holding surface of the chuck table, A first difference between the height of the upper surface of the sub-chuck table and the height of the holding surface of the chuck table is calculated. A workpiece is held on the holding surface, and the height of the upper surface of the sub-chuck table is calculated again by the holding surface measuring unit. The upper surface height measuring unit is brought into contact with the upper surface of the workpiece by vertically moving it, and the height of the upper surface of the workpiece is measured.