A grinding wheel includes a plurality of grinding stone groups arranged in an annular array, each of the grinding stone groups including at least three grinding stone segments having different thicknesses which include a smallest thickness, an intermediate thickness, and a largest thickness. The grinding stone segments in each of the grinding stone groups are successively arranged in the order of the grinding stone segment having the smallest thickness, the grinding stone segment having the intermediate thickness, and the grinding stone segment having the largest thickness, with uniform gaps left therebetween. The grinding stone segments in the grinding stone groups have respective radially inner edges aligned with each other in an annular shape.

A method of recoating an abrasive tool, wherein the abrasive tool includes a main tool body, which has at least one accommodating surface for accommodating abrasive bodies, wherein the abrasive bodies are adhesively bonded to the accommodating surface by an adhesive. The method includes at least the following steps: degenerating the adhesive, detaching the worn-out abrasive bodies from the main tool body, detaching the degenerated adhesive from the main tool body, reapplying the adhesive; and recoating the main tool body with new abrasive bodies.

A sanding wheel that may be used, e.g., to finish a wood deck, includes one or more risers. Each riser includes an angled face and a cross member, and the angled face and cross member define a slot therebetween. The retaining or fastening clip includes a retaining spring, and the fastening clip is received on the angled face of the riser with the retaining spring extending into the slot. The blade has an abrasive on a first end and an aperture at a second end, the aperture being defined by a shoulder about the aperture. The second end of the blade extends into the slot with the retaining spring of the fastening clip engaging the shoulder. The slot and the retaining spring are configured to mechanically lock the blade to the riser and the base.

A damped abrasive article comprises a damping body and an abrasive surface provided on at least a portion of the damping body. The damping body comprises a synthetic polymer having a Storage Modulus from 1000 MPa to 2500 MPa and a Loss factor from 0.025 to 0.10 at 25 C. and 10 Hz.

A grinding element mounted on a grinding wheel and a grinding wheel containing the same are provided for grinding. The grinding element includes a grinding tooth, and the grinding tooth includes a grinding material having a framework structure and pores distributed in the framework structure. The framework structure includes a bond material and abrasive particles that are bonded by the bond material. A pore size of the pores is larger than 40 microns but smaller than 70 microns. A manufacturing method for semiconductor packages using the same is also provided.

A grinding apparatus includes: a holding table for holding a workpiece thereon; a grinding unit including a grinding wheel for grinding the workpiece held on the holding table, the grinding wheel including a grinding stone made of abrasive grains and grains of photocatalyst bonded by a vitrified bonding material; a grinding water supply unit configured to supply grinding water to the grinding stone when the workpiece held on the holding table is ground by the grinding unit; and a light applying unit disposed adjacent to the holding table and configured to apply light to a grinding surface of the grinding stone while the workpiece held on the holding table being ground.

Disclosed is a concrete floor trowel machine of multiple blades with added floor polishing jacket or attachment. It saves expense and time associated with the use of a separate trowel and a polisher in consecutive order, often a day apart. Furthermore, disclosed is a blade replacement polisher disk with metallic hook-and-loop attached steel wool polisher puck, which is the loop component of that means of attachment. Means of slurry feed and suction removal to said puck is also disclosed, whereas said puck may rotate free or by planetary. Said pucks may be attached to blades. Safety cage and slurry splash cover supplement the machine. Removable caster legs are added to ease moving the off-use machine. Disclosed as well are robotic polisher-grinder modules in tandem or in train with changeable trowel-polisher modular inserts with electrical motors and power cable and water hose reels to be serviced from a distance, remotely controlled.

A replaceable tool mount for rotary floor treating machines consists of a wedge-shaped block having downwardly and inwardly sloping side edges designed to fit within a correspondingly shaped slot formed in a bottom surface of a circular drive plate. The upper surface of the wedge-shaped block includes a radial notch. A latch connected to the block by a living hinge overlays the notch and has a tab at its free end adapted to engage the peripheral edge of the drive plate when the block is advanced along the slot in the steel plate to a point when the tab snaps over the plate's peripheral edge. This prevents the block from any further movement until the latch is again released by raising it to the point where it no longer engages the front edge of the plate.

A grinding tool includes a substrate, and at least an abrasive particle affixed to the substrate. The abrasive particle has a base, and four tips adjacent to one another protruding from the base, the base having a cavity of a generally cross shape extending between the four tips, the cavity including a material discharge surface disposed between two adjacent ones of the four tips, the material discharge surface being located at an end of the cavity and adjacent to a side surface of the base, an inner material angle between the material discharge surface and the side surface being between about 120 degrees and about 160 degrees. Moreover, embodiments described herein include a method of manufacturing the grinding tool.

A grinding wheel which includes a plurality of vitrified bonded grindstone chips arranged on an outer periphery of an annular base metal thereof, and is configured to grind a workpiece with use of the grindstone chips while rotating the annular base metal, wherein each of the vitrified bonded grindstone chips is configured in such a manner that, in a rectangular parallelepiped including a rectangular grinding surface which is placed on an opposite side of the annular base metal and grinds the workpiece and four side surfaces adjacent to grinding surface, four ridge portions each of which is provided between the side surfaces are C-chamfered, each long side of the grinding surface is arranged along the outer periphery of the annular base metal, and each of the four ridge portions is C-chamfered in a range which is or more of a length of each short side of the grinding surface.