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Subject: RE: Experiments with ultrasonics and vibration etching

From: <fred27murphy@...>
Date: 2013-10-22

Thanks for your comments. It's good to know that people on here are interested in more than just how to do toner transfer.


I think the ziplock bag would have had minimal attenuation. Whilst there was a little air in it, it was above the waterline of the bath. I suspect the rigid plastic container would have attenuated more. The cleaner claims to be 50W and 45kHz. I may make a bubble etch tank (or maybe even spray) but thought I'd try something different.


If it looked like it made any difference I would consider modifying the cleaner or coating the bath, but as it appeared to be nothing it would seem a bit pointless to destroy it.


I tried the sponge technique when an etch started well but then seemed to stop. It worked well, but definitely affected the thinner tracks and small text. I used photoresist boards so perhaps a little more delicate than toner.


Fred



---In homebrew_pcbs@yahoogroups.com, <jan.kok.5y@...> wrote:

Thanks for reporting those results. I would suggest/request that you try "washing" the board with etchant using a small piece of sponge.

I've tried that, using a soft amber colored plastic (polyethylene?) foam sponge and it seems to work maybe twice as fast as the sloshing method.