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Subject: Re: [Homebrew_PCBs] Re: to drill or not to dril?

From: Stefan Trethan <stefan_trethan@...>
Date: 2004-03-24

> And while discussing methods of putting holes in boards, don't forget
> that you can laser thru the top copper, all the fiberglass and down
> TO, but NOT THRU the bottom copper. Makes cool blind thru holes.
>
>

That laser thing is really fascinating... bit expensive though...

How do they know where they are? i guess the reflection from copper/fr4 is
different?
and how does it work to cut through glass / epoxy?
i mean that are quite different materials, how can you blow a hole in
there with a laser?

ST