J
Is there a formula that will give me what tolerance I need to obtain 1.33 Cpk? For example, if my spec is .250 +/- .005 and the Cpk comes out at 1.15 and I need to be at 1.33, what tolerance do I need to obtain 1.33? Do I need +/- .006, or +.006/-.005, or +/-.007, or ???
I can go into our SPC software and put in different tolerances until the Cpk comes up 1.33, but I would like to know the math behind that. Is there a formula? Can anyone help me out? Thank you
I can go into our SPC software and put in different tolerances until the Cpk comes up 1.33, but I would like to know the math behind that. Is there a formula? Can anyone help me out? Thank you

