Hi Steve,
It sounds like you are running boards that may not be throw away
boards. I mean expensive after assembly. In such a case, incoming inspection
seems to be in order. I suggest that you get some training on bare board
manufacturing. There are some 5 days courses out there to show you the
basics of the process, how to do microsections and vendor evaluations.
You could then better evaluate your vendor prior to buying from
them. And you could also do some sampling (at least) on some of the more
complex designs prior to assembly. You can thrust that your bare board
supplier will do good work... most of the time.
Just a little remark,
Alain Savard, B.Sc.
Chemical Process Analyst
CAE Electronics Ltd.
e-mail: [log in to unmask]
-----Original Message-----
From: Stephen R. Gregory [mailto:[log in to unmask]]
Sent: October 6, 1999 6:53 PM
To: [log in to unmask]
Subject: Re: [TN] Two distinct layers of copper...
In a message dated 10/6/99 5:32:00 PM Central Daylight Time,
[log in to unmask] writes:
> It sounds as if you could all do with a couple of weeks in a pcb
> manufacturing shop to understand how the boards you order are made
>
> Talk to your boss and suggest it, you may learn a lot
>
> Paul Brown
Yeah Paul, you're right...I'm just a typical stupid user. This is the first
time I've been in a position that has had to actually deal with crappy
boards
from a fab shop. At my past positions, all the work was consigned, not
turnkey as it now. Our customers supplied us the boards and we just
assembled
them, if the board fell apart after they were built, it wasn't our problem.
I was hired at my present position as a surface mount process engineer, but
find myself being pulled into the PCB procurement and recieving inspection
end of things because it seems I'm the only one trying to take the time out
find out why we've been getting stung so badly with the boards that we buy.
The problems that rear their ugly head only happen AFTER we've assembled
many
boards. Presently, and in the past, the way boards are bought here is that
we
get the gerbers and drawings from our customers, the buyers find a fab shop,
and if the price is right, we buy the boards. I'm not in purchasing, I don't
see the gerbers or drawings before they're sent out, I just see the boards
when all the material comes together and we get ready to build them.
Yeah, you can call me a typical un-educated user, but I'm trying to change
that...
-Steve Gregory-
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