And a happy holiday season to you Bill. Wouldn't it be better talking
holiday cheer than of warped PCB's, though it's one of my favorite things.
What are some others?

Definitely love the smell eminating from a hot lamination press wherein
epoxy, or my particular favorite - polyimide, is burning and turning out
flat, or not, MLB's. It's even better when given the opportunity to help fix
a problem or two associated with it.

As you already know, if it ain't the design, it has to be the fab process or
what goes into it - right or wrong. Materials, constructions, press
condition, press cycles and some more interesting things make flat boards
when carefully selected and managed.

I suggest having a friendly visit with your supplier, say over some very
highly laced egg nog, and discuss world conditions and those of the
processes inside as well as those out when materials are brought up. It's
really just too easy to make flat boards. Truth is, it's hard not to make
them that way.

Again, seasons best and sleep on the issue for a while because sleeping on
the boards will not make them flat.

MoonMan

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