Surface Finish - 7: Surface Economics
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WARNING: Machine tools present a safety hazard. Improper operation can result in severe injury. These topics are for non-laboratory study only and are not to be used in conjunction with the operation of any tool or machine described herein. Never use a machine tool without the supervision of a qualified instructor.

High surface finish is not free. There are limits on machine capabilities and productions rates that can increase the cost of finish. For example an inexpensive lathe can not produce a surface finish of Ra=2. To achieve that finish the machining will have to performed on a much more expensive cylindrical grinder. Also the feedrate to achieve a high finish is much slower than normal and cost time which adds cost. The graphic below gives a simple example.

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label: surface finish, finish, symbols, ANSI/ASME B46.1, forumlas, measuring, costs