Yes sir, and I agree. I just jumped ahead seeing many x-sectional
opportunities, requiring inclusiong beyond the master drawing. One in
particular comes to mind, beyond voids in the same plane, and that is glass
fiber protrusion into the hole wall, as an example. Still, minimum is
minimum and if average is specified, you need to look at what that entails.

Regards,

Earl Moon
----- Original Message -----
From: Alain Savard <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, September 30, 1999 4:46 AM
Subject: Re: [TN] Hot: Copper plating thickness -Reply -Reply


> Hi Earl,
>
> I agree that minimum is minimum and average is average.
> We have specifications that are often different from the IPC and the
Master
> Engineering Drawing and Purchase Order do take precedence. If you look at
Ken's
> question though, you will see that he asks where he should be looking to
get a
> measurement method standard, that was my answer.
>
> Alain Savard
>
> >>> pod <[log in to unmask]> 09/29/99 05:53pm >>>
> Minimum is still minimum. Average is still average. Other requirements
must
> be considered as we all know. Some are two voids in the same plain as
> unacceptable, those elements reducing hole wall plating thickness below
that
> specified (glass fiber protrusion and so on). This is age old stuff and
the
> lady from the lab, or? knows the stuff.
>
> Earl Moon
> -----
> > Hi Ken,
> >
> >   Verify the thickness as per IPC-TM-650, method number 2.1.1. This is
> suggested
> > by the IPC A-600, section 3.3.6.
> >
> >   Verify also IPC-6012, section 3.2.6.2 and table 3-2 (under average
> copper, and
> > minimum thin areas).
> >
> >   Although in the present case, it does seem like a reject.
> >
> > Alain Savard, B.Sc.
> > CAE Electronics Ltd.
> >
> > >>> Ken Patel <[log in to unmask]> 09/29/99 01:42pm >>>
> > If my requirement for the copper plating is 0.001" minimum (as spelled
out
> > on my fab drawing) and if I am reading it between .0004"-.001", is it
> > rejects or not?. I tried to look at IPC-6012 which is calling out avg
> copper
> > thickness. I don't how easy to get ave #. This is clearly a reject to
me.
> > But I am looking for an expert opinion on the subject. Via Hole in
> question
> > is 16 mil +3 mil / -10 mils.
> >
>
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