A
Hi fellow Covers,
We have a customer print that requires the outer diameter of a nickel plated shaft (.750" ?.00025") process to meet 1.33 CPk. The nickel plating is a single batch process done by a supplier where parts are 100% inspected after the batch plating, accepted if in-size, and lapped into size if oversize.
Per our supplier, the plating operation is not capable of plating all parts to size, let alone statistically capable without the lapping step.
Is there a statistical technique we can recommend to our customer? Or just push back stating SPC isn't valid for this process and we'll provide 100% measurement results.
We have a customer print that requires the outer diameter of a nickel plated shaft (.750" ?.00025") process to meet 1.33 CPk. The nickel plating is a single batch process done by a supplier where parts are 100% inspected after the batch plating, accepted if in-size, and lapped into size if oversize.
Per our supplier, the plating operation is not capable of plating all parts to size, let alone statistically capable without the lapping step.
Is there a statistical technique we can recommend to our customer? Or just push back stating SPC isn't valid for this process and we'll provide 100% measurement results.