In Reply to Parent Post by ashram
I want to calculate cp,cpk for specification given on one sided.
my specification is 20 +0.180/+0.270
so how can I consider its Upper scale and lower scale limits.
Please Help ME.
USL (Upper Spec Limit) = 20 + .270 = 20.270
LSL (Lower Spec Limit) = 20 + .180 = 20.180
Those two points from your specification are all the Cp and Cpk need for calculation. Beyond that, all that is needed is whether the distribution is normal. If not, then the calculation may not apply anyway.