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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