Could anyone please explain to me how to correctly perform statistics for Profile of a line/surface. We currently have a customer that requires cp&cpk produced for all Critical Dimensions. One of them happens to be a profile of a line that's a bilateral tolerance. If the line/surface is -.001" below nominal and .0025" above the line/surface nominal how can I run stats? Any help would be appreciated.

Brian Wise
Quality Engineer
Minco Tool and Mold Inc.
bwise@mincogroup.com
www.mincogroup.com