Subject: laser vs. acid engrav

From: [email-masked]
Date: Wed, 08 Nov 95 04:17:04 EST

-=> Quoting In:[email-masked] to ** All ** <=-

 In> If you can make your own printed circuit boards you can
 In> surely acid-etch your own sundials.

 In> The process isn't difficult. Just coat the stuff you don't
 In> want etched with resist and dunk in acid until done.
 In> Swimming pool acid works fine.

The main problem with using an acid etch process for anything
much thicker than PC board work or shim stock is the problem of
etchant eating into the raised surface from the side of the etch
interface, i.e. an undercutting problem. The higher the relief
attempted, the worse will be the undercutting, rapidly leading to
ruined work. Thin sheet stock is frequently photoetched to create
detailing parts for the scale model trades, i.e. vent grills and
headlamp guards for model armored vehicles or radar antennas,
railings etc for ship models, but even those, which are quite
thin are often double sised etched to reduce undercutting.

Regards,
Brad Chaucer

... * Oh my GOD!  My computer's caught Windows!

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