Electronics Forum | Mon Feb 12 10:06:46 EST 2007 | CK the Flip Guy
DaveF, Please define a "Cp/Cpk capable profiler." Do you mean one that has software that automatically calculates this for you? I do this at my company, and we track 2 critical variables - Time Above Liquidous and Peak Temps. and this is done on a
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 | Wed Sep 15 16:18:58 EDT 1999 | Dave F
| Hello Everyone: | | I'd like to know How I Can get the CPK for a Fuji Machines? | If some body could help me please let me Know. | | Regard | | Gerardo Rodriguez | Gerardo: You determine Cpk on a Fuji machine the same way you do it on an
Electronics Forum | Tue Apr 27 16:00:19 EDT 2010 | scottp
In a nutshell, Cp is a measure of your process variation compared to your spec limits and Cpk is measure of both variation and how well your process is centered within your spec limits. Cp = (USL-LSL)/6*sigma where USL=upper spec limit LSL=lo
Electronics Forum | Mon Dec 06 13:32:47 EST 1999 | Bob Smith
CPk is a measure of the process variance with respect to the acceptable upper and lower limits. In your case it would be the accuracy of placement. The exact position of a chip ideally would be dead centre on the pads however in real life that positi
Electronics Forum | Wed Feb 24 21:01:34 EST 2010 | davef
You're correct, CPH doesn't mean dip. You want: * Perfect parts. * On-time delivery. * Cpk ~2 each quarter * Zero lost machine time as a result of product change-over. ... Right?
Electronics Forum | Thu Mar 02 14:04:30 EST 2006 | amol_kane
do u mean program as in software? Minitab can do all the basic statistical analysis for your data and give you Cp, Cpk Values. The Cp and Cpk values are derived from estimates from the data (hence necessary to have Confidence Intervals). Regards, Am
Electronics Forum | Thu Apr 18 17:17:20 EDT 2002 | Eric Wolf
I have found a consistency in certain package types which hold a very close tolerance. We use a six mil laser with electropolish. BGA's are tight. Some IC's drift. I think the range and Cp is more important than the Cpk for today. The reason bei
Electronics Forum | Mon Jan 17 12:16:02 EST 2000 | Brian W.
My old company (CM) ran SMT to 50ppm including some very complex boards. We established the normalizer number by: #components + #solder joints. As was stated earlier, the ppm for any given product is the result of many factors. You may get differen
Electronics Forum | Thu Mar 19 11:44:00 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
