A power tool including a housing with an electric motor in the housing. The motor has a stator and an armature, the stator having field coils and the armature having an armature shaft on which a commutator is affixed. A pair of brush boxes are located in the housing on opposite sides of the commutator. An orbit mechanism coupled to the armature shaft and a platen is coupled to the orbit mechanism. The field coils comprise a first field coil facing a front of the sander and a second field coil facing a rear of the sander and the brush boxes are rotationally offset from the field coils with respect to a vertical axis of the sander.

The present disclosure includes a method of forming a polished surface. Forming the polished surface can include grinding an initial ceramic substrate to form a ground ceramic substrate; infiltrating the ground ceramic substrate with silicon; and polishing the silicon-infiltrated ceramic substrate, thereby forming the polished surface.

According to one implementation, a blast treatment device includes at least one nozzle that injects media toward a workpiece, a first tank that supplies the media to the at least one nozzle, a movement structure that moves the at least one nozzle and the first tank, and a second tank that supplies the media to the first tank. The second tank is not moved by the movement structure.

Disclosed herein is a grinding wheel including an annular wheel base and a plurality of grinding stones fixed to an outer circumferential portion of the lower end of the annular wheel base. Each of the grinding stones is made of a mixture of abrasive grains and photocatalytic particles which are held together by a binder. The abrasive grains are diamond abrasive grains, and the photocatalytic particles are titanium oxide (TiO.sub.2) particles.

Disclosed herein is a grinding wheel including an annular wheel base and a plurality of grinding stones fixed to an outer circumferential portion of the lower end of the annular wheel base. Each of the grinding stones is made of a mixture of abrasive grains and photocatalytic particles which are held together by a binder. The abrasive grains are diamond abrasive grains, and the photocatalytic particles are titanium oxide (TiO.sub.2) particles.

A machine featuring a treatment tool that grinds a surface to a desired profile, imparts a desired roughness to that surface, and removes contamination from the surface, the machine configured to control multiple independent input variables simultaneously, the controllable variables selected from the group consisting of (i) velocity, (ii) rotation, and (iii) dither of the treatment tool, and (iv) pressure of the treatment tool against the surface. The machine can move the treatment tool with six degrees of freedom.

The present invention is provided with a grinding block of dry grinding machine for grinding concrete and granite, the grinding block is assembled to a mill of the grinding machine, the grinding block comprises a fixing plate to fix the grinding block to the mill, wherein the fixing plate is welded with a grinding media, the grinding media comprises a plurality of grinding pieces, the grinding pieces are connected by a connecting strip or connecting strips arranged with space, the connecting strips with spaces divide with a plurality of air passages between two grinding pieces.

A polishing apparatus connected to a robot arm and used to polish a workpiece includes a bracket, a polishing assembly, and a positioning assembly. The polishing assembly is mounted on the bracket and includes a driver and a polishing plate connected to the driver. The driver is capable of driving the polishing plate to rotate, and defines an annular positioning groove around the spin axis. The positioning assembly includes a first positioning plate and a second positioning plate mounted on the bracket and opposite to the first positioning plate. The first positioning plate and the second positioning plate are clamped into two sides of the positioning groove, whereby the driver is clamped between the first positioning plate and the second positioning plate.

A machine featuring a treatment tool that grinds a surface to a desired profile, imparts a desired roughness to that surface, and removes contamination from the surface, the machine configured to control multiple independent input variables simultaneously, the controllable variables selected from the group consisting of (i) velocity, (ii) rotation, and (iii) dither of the treatment tool, and (iv) pressure of the treatment tool against the surface. The machine can move the treatment tool with six degrees of freedom.

A machine featuring a treatment tool that grinds a surface to a desired profile, imparts a desired roughness to that surface, and removes contamination from the surface, the machine configured to control multiple independent input variables simultaneously, the controllable variables selected from the group consisting of (i) velocity, (ii) rotation, and (iii) dither of the treatment tool, and (iv) pressure of the treatment tool against the surface. The machine can move the treatment tool with six degrees of freedom.