Homebrew PCBs

Belt sander or equivalent?

Regards,
   JJ

On Tuesday, Mar 23, 2004, at 00:19 US/Eastern, Dave Mucha wrote:

> --- In Homebrew_PCBs@yahoogroups.com, Stefan Trethan
> <stefan_trethan@g...> wrote:
>>
>>> I think I am spoiled,
>>>
>>> The first batch of boards I had were of some other substrate and
> the
>>> copper pealed off easily.
>>>
>>> I can get muriatic acid from the hardware store, so that is easy
>>> enough.
>>>
>>> Hydrogen dioxide... I've seen that on the list before.  Seems I
> need
>>> to scan the list for quality and sources.
>>>
>>> IIRC, it is not the diluted stuff one buys to put on cuts.
>>>
>>> I just check the polls and there is only the poll about a minimum
> CNC
>>> machine.
>>>
>>> I wonder if we should put together a poll on what method each of
> us
>>> use to make boards.
>>>
>>>
>>> Dave
>>
>>
>> Good idea the poll.
>>
>> actually you need H2O2 which is dihydrogen dioxide i think, but
> everybody
>> calls it hydrogen peroxyde.
>>
>> I get it from a chemicals shop, very cheap there.
>> other sources are pool supplys, wood bleaching.
>>
>> You NEED to find stuff with 30% or 35% concentration.
>> The pool stuff is about 20% and is the lower limit.
>>
>> The food/desinfection/hair bleaching stuff is mostly 3% or less,
>> meaning you need a huge amount.
>>
>>
>> There are other etchants too, like ferric cloride and such...
>>
>>
>> Mechanical removal:
>>
>> I expect the following to work:
>> take a round rod of steel, heat it, apply solder, apply
>> solder on one edge of the PCB solder the rod to the copper.
>> let solidify, then rotate the rod, coiling up the copper like a
> fish tin
>> lid.
>> Because of the heat from the soldering the glue will already be
> attacked,
>> it will
>> lift off i think. once you have a piece lifted it should roll off
> without
>> rupture.
>>
>> I never tried this but from "accidents" when i didn't want it to
> lift at
>> all i expext
>> it to work.
>> You can try it and maybe you can aoid the etching alltogether.
>>
>> ST
>
>
>
> Great idea !
>
> I'l have to try that on a smaller board.
>
> It's nice that this board is so darn thick that it will not bend
> easily.
>
> Dave
>
>
>
>
>
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