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 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 | Wed Mar 18 22:53:53 EST 1998 | Scott McKee
| 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 Oct 18 08:17:40 EDT 2008 | hussman
Use a Cpk study on your screen printer. Deviation from print to print. Most reutable surface mount machine companies will supply you with their Cpp study they performed on your machine before they shipped it. On ovens use your profiler. You can
Electronics Forum | Fri Jan 17 11:21:01 EST 2003 | Brian W.
You can Cpk numbers for the DEK using the QcCalc software. Simply connect a computer to the RS232 port on the DEK and follow the instructions. The program can give you Cp, Cpk numbers for a number of parameters, including X alignment, Y alignement,
Electronics Forum | Thu Apr 26 08:34:32 EDT 2007 | ck_the_flip
Pavel is right...Your Quality Group, customers, and Management will really appreciate Cpk's. We do Cpk's annually, or whenever a major mechanical change (motor, blower, etc) is made. Pavel is correct in saying that Cpk's on most modern convection o
Electronics Forum | Wed Jun 06 02:59:11 EDT 2018 | buckcho
Mr. Evtimov, Koh Young and Parmi have this option in their SPC software. You can also choose either Volume, Area, position, height (both in um or %). Here is a screenshot from Parmi. Unfortunatelly i cant find my old Koh Young screenshots. Parmi has
Electronics Forum | Wed Oct 28 14:12:48 EST 1998 | Stefan W.
The only method I would trust measuring the cp or cpk is with an optical coordinate measuring machine used in metrology labs. The machine should have at least ten times better accuracy than the machine to be measured. For a print area of 18"X18" you
Electronics Forum | Wed Sep 09 08:28:04 EDT 1998 | Stefan W.
| I am attempting to locate a kit to be used on surface mount equipment to determine the placement capability (CPk). Does anyone have information on where to purchase such a kit? Ideally this kit should be usable on placement equipment from various
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