I need some help. We have several metal stamped parts which require a cpk of 1.33 or 1.67 on critical characteristics. The print will give us p/m .002 (.004 total) or p/m .0015 (.003 total). However, due to the cpk requirements we can't use all of that tolerance. When we setup to run the part, we need to bring the characteristic into spec. and run from there. What target tolerance band can I give them to shoot for (needs to be less than that on the print)?
For example,
.750 p/m .0015 must maintian Cpk of 1.67. OR
.800 p/m .002 must maintain CPK of 1.33.
In general, what would be the max p/m they could setup to at least give us a chance to hit the cpk requirement?
Thanks in advance.
For example,
.750 p/m .0015 must maintian Cpk of 1.67. OR
.800 p/m .002 must maintain CPK of 1.33.
In general, what would be the max p/m they could setup to at least give us a chance to hit the cpk requirement?
Thanks in advance.