I believe I can explain it. The agitation of the etchant would spead up the process, however what is actually causing the agitation is the edges of the board being moved through it. By the time the energy gets to the middle of the board it has dispersed. It would seem to me, that maybe what would work better is a bar that would move back and forth through the etchant right below the surface of the board. But that is just speculation, and I believe you would want to minimize the verticle movement of the agitating platform.
Maybe you could place to rails above the etchant that the agitator bar would be connected to and move along. I see a rather simple setup in my head.
Brian Goralczyk
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bdg0584@... "If we let the opinions of others keep us from doing what we know is right, than we have betrayed both ourselves as well as those we interact with"
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----- Original Message ----
From: Adam Seychell <
a_seychell@...>
To:
Homebrew_PCBs@yahoogroups.comSent: Monday, April 28, 2008 4:33:09 PM
Subject: Re: [Homebrew_PCBs] Re: etch tank idea
Craig vk2zcm wrote:
> I had a play with a piece of printed circuit board sitting flat copper side down on the surface of the etchant It was connected to a tiny variable speed motor which made the board orbit. While the refresh rate was fast It etched the board twice as quick around the edge and hardly etched in the centre, not successful at all. My thoughts at the time was to try a linear motion but never go around to it
>
> Craig VK2ZCM
>
Thanks for sharing your experience. I guess the motorised cam wheel idea
won't work then. I can't explain why that would happen, but I believe you.
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