Hey Lou,

I started our solder analysis back at my last gig because of a customer
request.  We did it monthly for a quarter to base line the pot (500 pound
Hollis) and then went to a quarterly sampling.

We used the prepaid mail-in envelopes from our solder supplier which made it
real flexible.

We did ~120 assemblies a month.

Hans

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Hans M. Hinners
Process Engineer
Toppan Electronics, Inc.
770 Miramar Road
San Diego, CA 92126
(858) 695 - 2222 ext. 241
(858) 695 - 6823 fax
[log in to unmask]


-----Original Message-----
From: Lou Hart [mailto:[log in to unmask]]
Sent: Wednesday, July 11, 2001 6:54 AM
To: [log in to unmask]
Subject: [TN] Wave solder pot analysis


TechNetters, I'd appreciate comments on contaminant analysis of a wave
solder pot.  We had been sending a sample out for analysis (type "C" I
think it is, by the mil spec) once per month.  Now the solder supplier is
telling me that once every six months is more than enough.  I've been
taking the contaminant data and plotting Q charts (for short-run SPC the
modern way, as I've been mentioning in this forum) with the monthly data.
 What has been your practice and recommendation?

At the moment, it is hard for me to feel comfortable with a twice-yearly
analysis of what seems to me to be an important material in our
manufacturing process.  Lou Hart

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