Powerful belt sander with variable speed control for improved versatility and belt tracking adjustment for accurate alignment of the sanding belt. Large sanding surface improves material removal rate. The inversion clamps and bench-mounting mat supplied enable the belt sander to quickly and easily transform into an efficient bench-mounted sanding unit, by fitting to a stable workbench. For a cleaner, safer working environment, the belt sander is fitted with a rear dust port that connects to a dust bag or dust extraction system.