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Re: etchant stir

Subject: Re: etchant stir
From: "James Thompson"
Date: Wed, 7 Jun 2006 15:22:14 -0400
Newsgroups: sci.electronics.basics
"James Beck" <[email protected]> wrote in message 
news:[email protected]
> In article <[email protected]>, Jamesthompson2002
> says...
>> I came up with probably an old scheme but simple enough to circulate 
>> etchant
>> in a pcb tank.
>> Start with a plastic soda cap, snip the edges of it to make fins. Then 
>> use
>> silicone sealant to glue a small magnet inside the cap. Cap sits on 
>> bottom
>> of tank, then.
>> Affix another magnet to the shaft of a small dc motor mounted in a 
>> standoff
>> base for your tank and directly under the cap.  As motor spins, so does 
>> cap
>> and etching solution.  Simple enough you think?
> I used an aquarium air pump and a bubble wand to keep things moving back
> in the day.
>                                Jim
Yes, the bubble wand is ok but it also causes a mist to rise from the tank. 
I knew of the chemistry lab stir and it is what I wanted to duplicate for a 
DIY etchant tank stir, to eliminate as much misting of etchant as possible. 
I'm just doing a small tank as of now to see how well it works out.  I have 
seen a few post talking about a pump for the etchant tanks and wanted to 
share my approach to it.  JTT... 

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