got it!
----- Original Message -----
From: "Abd ulRahman Lomax" <[EMAIL PROTECTED]>
To: "Protel EDA Forum" <[EMAIL PROTECTED]>
Sent: Friday, April 12, 2002 1:30 PM
Subject: Re: [PEDA] WANTED: PCB Expert (Off Topic)


> I've been having ISP problems. Verizon. Need I say more? Anyway, I think
> they are fixed, courtesy of addr.com.
>
> At 05:52 PM 4/11/2002 +0100, Jason Morgan wrote:
> >As for the latest on the actual problem - board warping to well within
IPC
> >recomendations but outside of what we'd like, it seems that the latest
> >boards have even less of a problem.
>
> Since warpage is "well within IPC recommendations" [presumably for a
> maximum warpage specification], the most significant problem here is the
> design of the rack into which the boards fit; it was clearly not designed
> to handle normal PC boards.
>
> One more comment: if one uses a single supplier for fabrication and
> assembly, one can make any specification whatever for warp on the final
> board (including  residual changes in warp after soldering), and it will
be
> the responsibility of the fabricator/assembler to make it work. If they
> can't do it, it would be, again, their responsibility to tell you that in
> advance. To avoid getting into a major hassle, it would be wise to make
the
> warpage requirement, and that it is tighter than the IPC standard, obvious
> and crystal clear in the purchase order/supplied specifications and files.
> Of course, fabrication outside the norms can have a major impact on cost;
> thus fixing the rack might well be the most economical procedure. Do the
> racks meet their specification? If not, the manufacturer would be
> presumably be responsible for replacing them....
>
>


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