To All,

I would also reccomend Total Quality Control by Armand
V. Feigenbaum as one reference and the CQE primer
published by the Indiana Qualit Council (I think thats
publisher).

Cp Cpk are essentially scores based on how repeatable
and accurate your placements are. For placement
equipment you would run a glass master or equivalent
for your particular machine and you measure how
precise each placement is.

In the past at another company we bought Universal
machines and they provided us with the Cp/Cpk scores.
Your vendor if its not Universal should be able to do
the same.

Tony Di Mauro
Circuit Technology Center
Haverhill MA.


--- Phil Crepeau <[log in to unmask]> wrote:
> hi,
>
> by far, my favorite book on this subject is
> 'design(ing?) for quality' by lochner and matar.  it
> is so simple and so well presented that you should
> immediately grasp what you need to do to design an
> experiment to determine the process capabilities
> (Cpk's) of your processes.
>
> phil
>
> -----Original Message-----
> From: Peter Tremewen [mailto:[log in to unmask]]
> Sent: Thursday, April 27, 2000 4:20 AM
> To: [log in to unmask]
> Subject: Re: [TN] PPM values for the Electronics
> Industry
>
>
> >
> > Finally in terms of qualifying equipment, I would
> not
> > put much weight on a ppm number but would look to
> Cp &
> > Cpk numbers as these a the true measurements of a
> > piece of equipments capabilities.
> >
>
> Tony Di Mauro
>
>         Blink, Could you explain what Cp and Cpk
> means in this context???? I'm
> intrested in compilling real satistics for our pick
> and place machines, but am
> relitively unexperianced. Also if any one could
> recommend some (preferably cheap) books
> on the subject I'd apreiciate it.
>
>                 Peter Tremewen
>
>
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