I found
<
http://www.lpkfusa.com/RapidPCB/ThroughHolePlating/proconduct.htm>
very interesting. They have a paste that is essentially squeegeed
into the holes, vacuumed out to clear the center of the hole, then
baked in an oven to cure. They have a kit,l but the active paste is
available for $240 for 20 of the 2.5 gm packages. Not cheap, but not
too bad, especially if you can reuse open packets.
Mark
At 02:46 PM 1/20/2009, you wrote:
>The problem seems there isn't any. Manufactures and resellers make a lot
>of money from this. You will only find the 'users manual'. The most
>'newbie' thing out there is Markus Zingg page that is not found
>googling. (available on links here, thanks!)
>My starting point was those manuals and MSDS from megauk, and some other
>manufactures easyly find googling. Then I read what pcb's manufactures
>say about they process in about 250 boardhouse webpages. Then google
>about those process. Found almost nothing, except patents and so. The
>link i give in the last post about pcb hole plating activation history
>is the most valuable thing i found.
>
>So
>http://www.megauk.com/datasheets/5050_Data_Sheet_ABC_Panel_Plating_Instructions_(ver.11.08).pdf
>http://www.thinktink.com/stack/volumes/volvi/copplate.htm
>http://electrochem.cwru.edu/ed/encycl/art-e01-electroplat.htm
>http://nr.stpi.org.tw/ejournal/proceedingA/v23n3/365-368.pdf
>
>These are the things that more worth the time reading.
>
>The baths are desmear-activation-platting, and have rinse and cleaners
>baths between them. But for few homemade board activation and plating is
>enough.
>Activation is the most tricky part but is can be done in chemical bath
>of many compositions i already told a mechanical way that can work...
>and found another way.
>Sodium metal is made from electrolysis of salty water. If you could make
>an electrolysis between the two copper layers in a sodium bath of NaOH,
>NaCO3 etc (NaCl shouldn't work) maybe it can leave the sodium inside the
>hole. You need an high impedance power supply for this, limiting current
>should be used. When the board short circuits it should be plated inside
>the holes. (My guess)
>
>Simao
>
>Juan EA7FNJ wrote:
> >
> > Hi guys!
> >
> > Well, my problem is the chemistry: I would like to find a good guide
> > about electroplating, but I don't find anything.
> >
> > Do you know about a good guide?
> >
> > 73
> >
> > --- In Homebrew_PCBs@yahoogroups.com, Simao Cardoso <simaocardoso@...>
> > wrote:
> > >
> > >
> > > I have just remembered other thing, once i read from some already dated
> > > IPC documents, a way to activate the holes, beautiful for it
> > simplicity.
> > > Not much info just named and short explained, and that was still in
> > > development.
> > >
> > > It consists in activate while drilling. The drill bit, make de hole and
> > > then entered in a metallic bath, when exit the hole will place the
> > > metallic components in the hole wall, while still rotating.
> > >
> > > Because all the dust made while drilling it should be better to drill
> > > and clean first and then redrill with a tin or silver or other type
> > > solution, in a soft cloth or so under the board.
> > >
> > > It can be an old, forgotten and bad results experiment, i just remember
> > > to name it here.
> > >
> > > Simao
> > >
> > > Markus Zingg wrote:
> > > >
> > > > Juan,
> > > >
> > > > How to use it greatly depends on the chemistry used. The
> > chemistry even
> > > > defines howmany tanks you need, wether they are heated, the
> > processing
> > > > parameters etc. etc. My best advice to you is to first organize a
> > > > chemistry, cause it's supplier will be able to tell you the
> > processing
> > > > requierements. Then build your station along them.
> > > >
> > > > HTH
> > > >
> > > > Markus
> > > >
> > > > Juan EA7FNJ schrieb:
> > > > >
> > > > > Hi guys!
> > > > >
> > > > > Ok, great machine! but, I can see how to make one but, where is the
> > > > > manual 'how to use it'?
> > > > >
> > > > > xD
> > > > >
> > > > > --- In Homebrew_PCBs@yahoogroups.com
> > > > > <mailto:Homebrew_PCBs%40yahoogroups.com>, "Steve" <alienrelics@>
> > > wrote:
> > > > > >
> > > > > > Have you checked the Links under "Plated Through Holes" yet?
> > Not many
> > > > > > links there, but it is something. Markus Zingg's page on
> > through hole
> > > > > > plating has been down for a while, but I just found where someone
> > > > > > mirrored it and put that link in place of the missing site.
> > > > > >
> > > > > > http://tech.groups.yahoo.com/group/Homebrew_PCBs/links
> > > > > <http://tech.groups.yahoo.com/group/Homebrew_PCBs/links>
> > > > > >
> > > > > > If you find any other links on through-hole plating, please
> > place
> > > them
> > > > > > there.
> > > > > >
> > > > > > Steve Greenfield
> > > > > >
> > > > >
> > > > >
> > > >
> > >
>
>
>------------------------------------
>
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