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December 2003

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Subject:
From:
"Wolfgang E. Erat" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 30 Dec 2003 14:34:44 -0000
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text/plain (92 lines)
Hi Guys

just to confuse the facts a bit....In a former life I had two sets of IST
coupons (reliability test) produced at the same time (same process / same
material) the only difference was that on one set all pads where
removed....padless holes...just the track connecting to the barrel,
innerlayer and outerlayer. The padless coupons actually performed better.
There are traditional specifications and there is engineering data.

happy new year
Wolfgang


----- Original Message -----
From: "27782" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, December 30, 2003 2:24 PM
Subject: Re: [TN] Annular ring


> Hi Bruce,
>
> Sounds to me like they have an issue with maintaining their tol. thus,
they
> need to cover their butt. Work the issue with them, if you require mil
spec
> than the answer is no waiver!
>
>
>
> Dan Mauro
> Celestica Corp. (CNE)
>
>
>
> Bruce D Stilmack writes:
>
> > I have a PCB manufacturer requesting a waiver for the MIL SPEC
requirement
> > of a 2 mil annular ring.  Their position is that the coupons are from
the
> > edge of the laminate where the registration is worse.  The assumption is
> > that the ring will be larger in the PCB itself.  I am leery to grant a
> > waiver to allow this deviation, but would like to know how the community
> > feels about this.
> >
> > Bruce Stilmack
> > GDLS-TO Manufacturing Engineer
> > (850) 574-4773
> > [log in to unmask]
> >
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