Current specifications for shaft finishes to be used with shaft seals are inadequate. Many finishes which meet these current specifications do not perform well in sealing applications because they can cause either leakage or abrasive wear of the seal lip. The practice of leaving the selection of the process to produce the finish up to the shaft manufacturer may lead to poor performance of the sealing system. A new shaft finish specification is proposed which specifies a process to obtain a satisfactory sealing surface. It has been found that machine lead can be generated by plunge grinding. Grinding procedures for avoiding machine lead during plunge grinding are listed. In order to be certain that machine lead is not present, the surface must be inspected for it. Therefore, a special method for checking for machine lead is recommended.

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