Lou.

I used to have the solder pot tested on a quarterly basis, and the only change I had to make
was to add extra tin once. All the other contaminants remained stable.

Steve.

"Tempea, Ioan" wrote:

> Hi Lou,
>
> we are doing it on a quarterly basis for as long as I can remember and I
> didn't notice any significant difference between each set of results. All
> the contaminants are very low each time. And we passed all the ISO audits.
>
> Frankly, I think that twice a year is not a bad idea.
>
> Regards,
> Ioan
>
> > -----Original Message-----
> > From: Lou Hart [SMTP:[log in to unmask]]
> > Sent: Wednesday, July 11, 2001 9:54 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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