Abstract: The present invention discloses a grinding brush fixing device applying to a pneumatic tool for surface treatment. The spacing between the fixing arms and arc plates of the brush holder is reduced. Thereby, the press-fit face of the axially-extending fixing arm can press the brush collar onto the first press-fit edge and second press-fit edge, which are at two sides of the notches between two axially-extending arc plates. Further, a flexible gasket is radially placed in a space between the fixing arms and the arc plates. When the fixing disc is fastened to the brush holder, the flexible gasket and the brush collar are tightly compressed and firmly secured. Thus, force can be uniformly applied onto the brush collar and the bristles. The present invention can promote the stability of brush's rotation, generate straighter ground strips, prolong the durability of the grinding brush and grinding brush fixing device, and promote the grinding efficiency.

Abstract: A grinding apparatus including a cylindrical grinding wheel assembly mounted on a vertical drive shaft extending from an electric motor through a horizontal work table. The apparatus includes a pressure sensitive electrical switch for activating the motor in response to downward force on the work table. The work table is supported on a housing adapted to contain the motor and can be interchanged with work tables of various sizes and configurations. The grinding wheel assembly includes a core element and a grinding element where the grinding element is secured to the core element by various mechanisms to allow the grinding element to be removed from the core element while the core element is secured to the drive shaft so as to interchange the grinding element in the event that a grinding element has been worn out.

Abstract: A honing device for mounting on a honing tool for rotation therewith including a backing material having opposite end surfaces, opposite side surfaces, and an edge surface extending between the opposed end and side surfaces, and a layer of an abrasive such as a superabrasive material and a binder attached onto one of the side faces and extending therealong to the edge surface whereby an edge of the abrasive layer and the adjacent edge surface engage the workpiece surface to be honed.