[chbot] chemical milling

[Andrew Errington]

Hi Mark,

I don't have experience of that technique, but it mentioned a lot as a way
to etch PCBs.

Clean board
Spray paint
Ablate PCB pattern with laser
Etch
Clean off paint

Obviously you are doing the same thing, but without the FR4 substrate.

Apparently copper is highly reflective, so it makes laser cutting more
dangerous as more stray reflections occur. Do not stare at the laser with
remaining eye.

Andrew

PS I have etched PCBs with hydrogen peroxide and vinegar. You also have to
add a bit of salt. Don't put it on your chips though.


On Mon, 7 Dec 2020, 10:43 Mark Atherton, <markaren1 at xtra.co.nz> wrote:

> Thanks Andrew,
>
> The hydrogen peroxide/hydrochloric acid solution looks most interesting;
> never heard of it before.
>
> My largest complaint back-in-the-day when using Ferric Chloride was the
> indelible orange-stain that the spills caused.
>
> Anyway, I am looking into chemical-milling some thin copper sheet, and you
> may have solved one of the issues.
>
> Just wondering about spraying a thin layer of paint on the copper.
> Removing the 'resist' using a laser cutter, then etching the remaining
> piece.
>
> Anyone have any experience with a similar process ??
>
> -Mark
>
>
> On 07 December 2020 at 09:14 Andrew Errington <erringtona at gmail.com>
> wrote:
>
> Ferric chloride is nasty, and becoming increasingly difficult to get.
>
> Try hydrogen peroxide and hydrochloric acid (or hydrogen peroxide and
> vinegar). Instructions on the web. I have tried it and it works.
>
> Andrew
>
> On Mon, 7 Dec 2020, 08:56 Marshland Engineering, <
> marshland at marshland.co.nz> wrote:
>
> Is this Ferric Chloride still available in NZ ?
>
> I have some ammonium persulfate but FC works at room temperature which
> makes
> it easier.
>
> Cheers Wallace
>
>
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