Amen to your statement Moonman
----- Original Message -----
From: Earl Moon <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, March 14, 2002 8:07 AM
Subject: Re: [TN] Board Bow and Twist


> Now this is starting to get interesting. The first comment about DFM, how
> about that?
>
> Taking it a step farther, as part of my stiring the pot response way
> earlier, we need to get sensible. You acceptance experts easily find the
> right IPC thing and test method. Well ain't that great.
>
> The whole point of this incredible exercise is about designing - not
> accepting after the damn thing does or does not work for BGA's or whatever
> needing minimal bow and twist.
>
> You hot shot designers out there have to be thinking about what you need.
If
> you have a board needing .75% then design your board accordingly. As I
said
> before, panelization is very important in this case. You must not design a
> two up panel when you know it will not be possible to meet the
requirement.
>
> Board shops know most of this but designers must get on top of it. We all
> know about balanced constructions but few realize how designing a board's
> size and thickness on a panel will make or break you.
>
> If you're on the edge of being two up, and have a critical need, make sure
> it's done on a one up. If you have critical requirements, keep it simple
> stupid while realizing what design considerations you make will affect Ken
> Carlile's boards. His designers certainly did not think about it and look
> what he's bitching about now notwithstanding poor supplier selection.
>
>
> MoonStraightMan
>
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