Uses a 150 mm wide belt results largely depend upon the skill of the operator. Situated at a suitable distance from the jack is the backstand idler this consists of an idler wheel which is spring loaded and is adjustable in a horizontal plane for the accurate tracking of the belt. The distance of the center of the idler wheel and the contact wheel is also adjustable to allow the correct tension on the belt. This backstand idler set up is generally the basis of design for the more complex sanding units.
Conveyor belt is adjustable to bring work up to sanding drums.
Sanding drums are felt covered and usually the abrasive paper is spirally wound onto the drum. Wide belt sanders can come in many sizes and designs the basic principle is the same. A conveyor belt takes the work under or over the sanding belts. Usually the sanding heads are adjustable as to height per the work. Belt tensioning is achieved by a hydraulic operated ram which moves the idler pulley closer to or further away from the sanding head.