Abstract: A system includes a wheel positioned at an initial position. A back portion of the wheel is configured with a plurality of grooves to attach to a connecting apparatus. A cover is positioned adjacent to the wheel. The cover is configured to be positioned over the wheel. The cover is configured to work in conjunction with the wheel to rotate and sand one or more surfaces. The connecting apparatus receives the cover and wheel. The connecting apparatus is connected to the plurality of grooves and enables the cover and the wheel to rotate and sand the one or more surfaces.

Abstract: A fan speed control system includes a rack and a plurality of servers disposed on the rack. The fan speed control system further includes the management module and the fan module. The management module is coupled to the servers, and the fan module is coupled to the management module for dissipating the heat from the servers. The fan module contains the fan, the speed control module, and the main control module. The speed control module is coupled to the fans. The main control module has a primary communication port. The main module which enters the interrupt sequence receives the control signals sent from the management module through the primary communication port when any one of the main modules enters the interrupt sequence. The control signal is delivered to the speed control module for reading the fan speed.