Superfinishing is a
metalworking processwhich produces a very fine, mirror-smooth finish. After a metalpiece is ground to an initial finish, it is superfinished with a finer gritsolid abrasivestone or abrasive lappingcompound in the form of a paste.
After any machining operation, peaks and valleys are left behind in the surface. [Jeff Schwarz, [http://www.mmsonline.com/articles/129804.html For Superfinishing Excellence, Start With The Right Finish] . Last accessed
11 September, 2006.] These variations, typically a few millionths of an inch in magnitude, can be seen under high magnification. This surface is further smoothed by rubbing with a very fine abrasive stone or paste. During this process, the pressure applied between the abrasive and the work piece is very light and has a short stroke. Its motion on the work piece is controlled, such that the grains do not travel along the same path on the surface, which produces a super fine finish. This is superfinishing.
The term Superfinishing is applied to a number of different processes; most conventionally, an abrasive cutting stone oscillates while applying
pressureon the work piece, which may be round or flat. Usually, though, superfinishing is done on round work pieces (such as automobile enginebores and gunbarrels) to improve roundness and reduce friction. Processes utilising moving tapes and abrasive paste, and even 'tumbling' with abrasive stones are also frequently marketed as Superfinishing; the suitability of the finish and of the process must be established before use!
It has been proven that superfinishing certain parts makes them more durable. For example if the teeth in a gear are superfinished they will last up to four times as long. [Timothy L. Krantz, [http://www.grc.nasa.gov/WWW/RT/RT1999/5000/5950krantz.html Gear Durability Shown To Be Improved by Superfinishing] .]
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