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Technical Info: Equipment

STROKE (OR PAD) SANDER
Mainly used in woodworking industry – furniture manufacture – joinery. Uses a 150 mm wide belt – results largely depend upon the skill of the operator.
BACKSTAND IDLER AND POLISHER
This is the basic machine used in the metal industry – consisting of a polishing jack in which is mounted a contact wheel (a special wheel to assist the application of the abrasive belt). 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.
DRUM SANDER
Illustrates principle of a multi-drum sander. 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. Generally a coarse – medium and fine sanding papers are used so that the 1^st head with coarse paper removes surface faults, -- the other two heads progressively reduce the scratch pattern of the first head to achieve the final finish required. Drum sanders are generally used in the woodworking market segments; however, the introduction of the wide belt sander has tended to phase out this machine in many shops.
WIDE BELT SANDER
Illustrates the basic principle of a single wide belt sander. 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. The second idler assists in tracking the belt. Also the top idler moves in a horizontal plane and keeps the belt in alignment – this movement is achieved in a number of ways, but the activation of the pulley is caused by the belt intercepting a flow of air cutting off a photo-cell. Used widely in plywood industry – particleboard – metal sheet sanding – furniture industry. Belt widths vary from 610mm up to 3000mm. Belt lengths vary from 2500mm to 3800 mm.
DISC GRINDER

Fixed: Work is taken to the machine, the disc can vary in diameter from 300 mm to 1000 mm. Abrasive disc is either adhered to the disc or mechanically clamped. Main use – furniture shops and pattern shops.
Portable: Commonly used in industry where the machine is taken to the work. Can be powered by electric motor or air motor. Depending upon back-up the abrasive disc can be a standard Fibre disc or used with a P.S.A. disc. Disc unit is held by hand. Machines illustrated are the basic units used in the industry, there are many modifications to these basic units which are designed to achieve the particular application results required. Some of these special units are:
Centreless Grinders Platen Grinders Oscillating Sanders

Coil Grinders Roll Grinders Special Pad Sanders

Plunge Grinders Swing Frame Grinders