Electronics Forum | Fri Mar 09 15:10:08 EST 2007 | oldsmtdude
Simple question... Not so simple answer. It depends largely on process spec and honesty of the people running the test. Most will jump to throw out the flyers as "special cause". So if you didn't set the spec and didn't witness the run and measu
Electronics Forum | Wed Jul 04 12:22:07 EDT 2001 | davef
Several points: * Consider that your Cpk is probably different for both placing large and small components. * Probably your routine placement rate SB the speed you use to monitor the accuracy of your process. * Some people use a calibrated glass test
Electronics Forum | Fri Mar 20 15:10:54 EST 1998 | Steve Abrahamson
| Cpk's on top flight ovens (e.g., Conceptronics, Heller, Electrovert, Vitronics) vary wildly, from 1 to 2+, between different supplers. The suppliers don't seem to understand Cpk's. A supplier's rep whose oven has a Cpk of 1.0 told me: | 1. Cpk's
Electronics Forum | Sat Feb 10 09:36:52 EST 2007 | davef
Choices are: * Run a Cp, Cpk capable profiler through the oven. * Review the results of your supplier's process qualification that would include Cp, Cpk on their oven. Handspring contract [REV. 6 - 7/1/99] with Flextronics says: [snip] 4. Process Ca
Electronics Forum | Wed Dec 13 16:12:01 EST 2000 | C Dooley
Is it possible to find the Cpk value for attribute data? We are running into problems due to unspecified LSL/USL values. How can we find the Cpk values without specific LSL/USL? We would also like to get some reference books on this subject so any
Electronics Forum | Sat Mar 21 16:37:22 EST 1998 | Earl Moon
| | Cpk's on top flight ovens (e.g., Conceptronics, Heller, Electrovert, Vitronics) vary wildly, from 1 to 2+, between different supplers. The suppliers don't seem to understand Cpk's. A supplier's rep whose oven has a Cpk of 1.0 told me: | | 1. C
Electronics Forum | Mon Aug 18 15:00:36 EDT 2008 | 18424
Go with the KIC 24/7 system. Does all your monitoring for you and generates your cpk. Only have to run a golden board once it takes care of the rest.
Electronics Forum | Mon Dec 06 14:59:37 EST 1999 | Brian W.
Cpk is sometimes referred to as the voice of the process because it is measuring how tight your process is in relation to the specification limits. A Cpk of 1 means that you are running a 3 sigma process (plus or minus 3 sigma). This means that you
Electronics Forum | Tue Apr 08 18:15:14 EDT 2003 | kent_peterson
Running the PAM board is a great tool. Using another machine to get you CPK is very inportant. We use the DT651 which does everything the PAM rom card does plus it gives a CP and CPK value. You can also use it to verify feeders in the X and Y. SMT re
Electronics Forum | Tue Sep 14 13:27:57 EDT 1999 | Scott S. Snider
| Can anyone out there pls enlighten me on how to solve chip tombstone defects. | I am running a board with a lot of 0603 chip. i had fine the profile and the alignment, but it still happen randomly on the board itself. Is there any other way to sol
