Homebrew PCBs

I took a video of painting the board and will have it on YouTube soon. 

Rick

-----Original Message-----
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
On Behalf Of Stefan Trethan
Sent: Sunday, January 13, 2013 7:44 AM
To: Homebrew_PCBs@yahoogroups.com
Subject: Re: [Homebrew_PCBs] No HASL

I think anything will eventually crumble in a ball mill. The people who use
lead balls complain about media contamination and wearing of the lead balls,
so it does happen. I guess you could speed things along by using steel balls
to crush the lead.

SMD paste contains spherical balls of a specified maximum diameter. I would
not be surprised if the way to manufacture them was some tuned up downsized
shot tower process similar to what you propose.





Anyway, given the requirement to use things on hand, I think the "heated
metal paintbrush" idea would be most efficient. It's just a matter of
squeezing some brass or copper wool/strands in the end of a metal tube and
saturating the thing with solder. If the goal is just to get the board
tinned making solder powder is not really necessary.


ST



On Sun, Jan 13, 2013 at 2:15 PM, Donald H Locker <dhlocker@...>
wrote:
> I suspect solder is too malleable for a ball mill to crumble. Hot
inert-gas spray? I'd probably start with carbide paper/Wet-orDry abrasive
sheets. Maybe just knife-scraping the surface with uneven pressure could
make small enough particles.
>
> Donald.
> --


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