Polishing wheel

Aluminum oxide is also widely used as an abrasive. An abrasive is a very hard material used to grind, polish, sand, scour, scrub, smooth or polish some other material. Among the products that include aluminum oxide as an abrasive are emery boards, sandpaper, grinding and polishing wheels and belts, lens grinding devices, and gem polishing wheels. 

The metal samples, 2x1 1/2 x 1/8 inches, were polished to a mirror finish on a polishing wheel covered with kitten-ear polishing cloth wet with a suspension of Linde alumina (Type B-5125). Each polished metal sample was covered with an evaporated film of the same metal (1000 A. thick) just prior to use. These films were hydrophillic, indicating the absence of organic contamination. 

A much simpler version of this test, which can be used as a screening test, is to apply the adhesive tape to a freshly polished soft copper panel using a 100-grit aluminum oxide polishing wheel or 150-grit paper, then heat-age this at 100°C (212°F) for 72 h. After allowing to cool, the tape is removed and the panel inspected for any indication of staining. 

Plastics should never he finished on polishing wheels used for metal. Small metal particles may he left on the wheel and damage the plastic surface. All rotating machines should he electrically grounded because the frictional movement of the wheel against the plastic surface readily generates static electricity. 

Cast films, including photographic film and cellophane, are made by flowing a solution of the polymer onto an extremely smooth surface in the form of a large polished wheel or a metal belt or band. After the solvent has evaporated (or, in the case of cellophane, the polymer has coagulated) the film is stripped from the casting surface. 

Buffing and polishing Buffing and polishing wheels for the optical industry. 

To polish the electrode, a polishing wheel can be used as shown in Figure 6.3.1.5. Sandpaper or micropolishing cloths are put at the center of the wheel. The lower speed levels of the pohshing wheel are used to polish the electrodes. 

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