Abrasive Belt Grinders
ABRASIVE BELT GRINDER
Abrasive Belt Grinders cover three broad finishing areas:
o Contact Wheel for polishing, deburring and chamfering.
o Flexible Belt for contours.
o Platen for flat surfaces.
Sometimes too much is expected of a platen grinder with a pressure grinding mechanism. Relative to platen size, only a small area of ferrous material can be ground. The area increases with softer materials. Carbide is the only highly wear resistant facing for pressur gerinding. Platen grinders do not provide the precision of surface grinders or stock removal of milling machines.
These few limitations are mentioned to discourage the occasional and not obvious overuse of belt machines with power feed.For handwork, belt grinder limitations are very few and are very obvious
In general, abrasive belt grinding will perform a host of operations faster than any other method. For instance, a contact wheel belt grinder will remove metal twice as fast as a wheel grinder. Actually, most contours, edges and flats can be finished in the fastest possible way with abrasive belt machines.
POLISHING and BUFFING Operations-
The polishing and buffing trade uses certainterms and equipmentf or its basic operations. These are described as follows:
ROUGHING(or Grinding) means coarse polishing with a coarse abrasive belt .This is usually done to remove excess material or to remove defects before final polishing
POLISHING means surface improvement with a fine or medium abrasive belt. This is usually in preparation for final finishing.
BUFFING is often the final finishing operation.
Usually a cloth or sisal wheel is used with abuffing compound. Sometimes buffing is two operations cut buffing to remove polishing scratches and color buffing for high luster. Some materials and surfaces can be buffed without prior polishing
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