A system for removing material from a workpiece comprising: a mounted-point grinding tool configured to move from a first position to a second position traversing at least a portion of a slot in a workpiece and removing material from a surface of the workpiece; and a first nozzle configured to deliver coolant to the mounted-point grinding tool, wherein the first nozzle is configured to move with the mounted point grinding tool from the first position to the second position so that the distance between the first nozzle and the mounted-point grinding tool remains substantially unchanged. A second nozzle can be mounted on the opposite side of tool from first nozzle, with the second nozzle also configured to move with the grinding tool so that the distance between the first nozzle and the mounted-point grinding tool remains substantially unchanged during grinding.

A diffusion plate includes a plate member facing an opening end of a supply pipe with a thickness direction thereof substantially parallel with a supply direction of a supply fluid. The plate member is rotatable around a rotation axis substantially parallel with the thickness direction and has a diffusion hole, penetrating in the thickness direction at a position other than a rotation center of the plate member. The diffusion hole has a wall surface defined at a rear side in a rotation direction and has a first wall surface end defined in a facing surface facing the supply pipe, at a rearmost in the rotation direction and a second wall surface end defined in a non-facing surface at a rearmost in the rotation direction. The wall surface is inclined with the first wall surface end being at a front side of the second wall surface end in the rotation direction.

A diffusion plate includes a plate member facing an opening end of a supply pipe with a thickness direction thereof substantially parallel with a supply direction of a supply fluid. The plate member is rotatable around a rotation axis substantially parallel with the thickness direction and has a diffusion hole, penetrating in the thickness direction at a position other than a rotation center of the plate member. The diffusion hole has a wall surface defined at a rear side in a rotation direction and has a first wall surface end defined in a facing surface facing the supply pipe, at a rearmost in the rotation direction and a second wall surface end defined in a non-facing surface at a rearmost in the rotation direction. The wall surface is inclined with the first wall surface end being at a front side of the second wall surface end in the rotation direction.

A method for grinding out a contoured workpiece including providing a grinding wheel having a first abrasive work surface location and a second abrasive work surface location, the first abrasive work surface location having a first tangential radius and the second abrasive work surface location having a second tangential radius, the first and second tangential radii being different, grinding the workpiece at a first time with the first abrasive work surface location without the second abrasive work surface location performing grinding, and grinding the workpiece at a second time with the second abrasive work surface location without the first abrasive work surface location performing grinding.

A method for grinding out a contoured workpiece including providing a grinding wheel having a first abrasive work surface location and a second abrasive work surface location, the first abrasive work surface location having a first tangential radius and the second abrasive work surface location having a second tangential radius, the first and second tangential radii being different, grinding the workpiece at a first time with the first abrasive work surface location without the second abrasive work surface location performing grinding, and grinding the workpiece at a second time with the second abrasive work surface location without the first abrasive work surface location performing grinding.

A grinding worm being a dressable grinding worm, wherein a first section of the grinding worm has a first abrasive grain which is incorporated in a matrix material and wherein a second section of the grinding worm has second abrasive grain which is incorporated in the matrix material. The first abrasive grain and the second abrasive grain differ from one another in terms of grain size and/or grain material. A transition section is formed between the first section and the second section, in which both the first abrasive grin and the second abrasive grain are incorporated in fie matrix material, wherein the first section, the second section and the transition section have the same matrix material and wherein an intermixing of the first abrasive grain and the second abrasive grain is formed at least in sections in the transition section.

A grinding worm being a dressable grinding worm, wherein a first section of the grinding worm has a first abrasive grain which is incorporated in a matrix material and wherein a second section of the grinding worm has second abrasive grain which is incorporated in the matrix material. The first abrasive grain and the second abrasive grain differ from one another in terms of grain size and/or grain material. A transition section is formed between the first section and the second section, in which both the first abrasive grin and the second abrasive grain are incorporated in fie matrix material, wherein the first section, the second section and the transition section have the same matrix material and wherein an intermixing of the first abrasive grain and the second abrasive grain is formed at least in sections in the transition section.

The present disclosure provides a carrier disk for holding at least one cutting, grinding or polishing element in a floor grinding machine. The carrier disk comprises a carrier body having a downwardly exposed face, at which the grinding element is arranged, a opening formed in the carrier body and a plurality of flanges extending axially from the carrier body and between the opening and a radially outer edge of the carrier body.

The present disclosure provides a carrier disk for holding at least one cutting, grinding or polishing element in a floor grinding machine. The carrier disk comprises a carrier body having a downwardly exposed face, at which the grinding element is arranged, a opening formed in the carrier body and a plurality of flanges extending axially from the carrier body and between the opening and a radially outer edge of the carrier body.

An abrasive article including a disc including a central axis; a primary outer edge substantially coaxial with the central axis and having a circumferential length, L.sub.1; a secondary outer edge substantially coaxial with the central axis and coplanar with the primary outer edge, the secondary outer edge having a circumferential length, L.sub.2, wherein L.sub.2 is less than L.sub.1; and a structurally weakened portion extending substantially adjacent to the secondary outer edge. In an embodiment, the abrasive article further includes a shedable portion configured to rupture the structurally weakened portion when the shedable portion is removed from the abrasive disc. In another aspect, an abrasive article having an initial outer circumferential length, L.sub.I, and a length of deliberately exposable circumferential edge surface, L.sub.OE, wherein L.sub.OE is greater than L.sub.I.