Belt grinders consist of a wide belt that has one abrasive side, covered in grit or glass. The belt is clamped into place between two rollers. In most belt sanding machines, the front roller is operated electronically and drives the sanding process. The back roller is used to hold and maintain the position of the sanding belt and ensure the belt sanding machine is delivering accurate and consistent results.
Once switched on, belt grinders pull a sanding belt at high speed. When this belt comes into contact with the surface of a workpiece, it strips protruding areas and leaves behind a smoother finish. In order to deliver a satisfactory finish, an industrial belt grinder must maintain the sanding belt at a specific tension. A belt that is too loose can result in uneven surfaces and a general lack of smoothness in the workpiece. Belts that are too tight can cause a range of problems, including premature wear and tear of the machine. There is also a chance that an over-tightened belt can snap and cause injury to the operator.