Abstract: An endless belt sander comprising a drive pulley and an idle pulley to control an endless sanding or polishing belt having a length substantially longer than that required for surrounding the pulleys. The belt of any desired but applicable width and predetermined length is wrapped around a workpiece of limited accessibility, regardless of the diameter of such workpiece. The belt is kept from slipping on the drive pulley by use of a pressure pulley which forceably acts upon that portion of the belt engaging the drive pulley.