[sudo-discuss] pcb etching materials

[Jake]

this is the first i've heard of your idea.  I would love to help etch 
boards for kits at sudoroom.

i have never done the photoresist method with circuitboards but I bet that 
pre-coated boards like ours which are probably ten or more years old are 
NOT going to work.  that would be my first guess.  second, i don't see any 
good reason to etch them with photoresist, we have much more DIY-friendly 
methods available in sudoroom.

for example the "Toner Transfer method" which is why I have gathered a 
stack of glossy magazine pages in the drawer with the PCB supplies.
You can read all about that method on the internet, i've used it and it 
works fine, although the devil is in the details.  If you want to try it I 
will certainly help.

And the toner transfer method is exactly what we should be doing to make 
use of flat blank circuitboards which we have tons of.  Alternately we can 
use the CNC machine attached to the computer near the bigTV to carve 
boards like seen in the leftmost of the following pictures:

https://groups.csail.mit.edu/drl/wiki/images/2/2c/ATM0PCB0-three-ways-med.jpg

all three are the same circuit but the leftmost method achieves results 
with the least quantity of CNC milling to the board.  also it's beautiful.

Seperately, we can very easily make circuits using pyralux (which I have 
plenty of) using our wax printer (which does work) as I did a few weeks 
ago, very easily, as described in this album:

http://imgur.com/gallery/TbzsP

quit keeping your project secret and collaborate with me.

-jake

On Sun, 28 Aug 2016, robb wrote:

> captain_morgan & i are trying to make some kits to raise revenue for
> sudoroom but the etching materials we have don't seem compatible on the
> chemical side (maybe they're expired?).
>
> we have boards but the photoresist isn't setting under the uv light so we
> haven't gotten to the etching phase.
>
> does anyone have any good photoresitive material we could use?
>
> thx
>