prototyping methods - electroless tin plating

[Ken Stone]

Try http://www.keynet.net/~lindsay/


>Another resource is Linsay's technical books at
>http://www.keynet/~lindsay  They reprint some of the older trade books
>on metal working and finishing - have an excellent one on anodizing -
>easy to do, fairly safe ( dilute H2SO4 ) and gorgeous results!
>
>> -----Original Message-----
>> From:	Grant Richter [SMTP:grichter at execpc.com]
>> Sent:	Monday, September 22, 1997 1:40 PM
>> To:	synth-diy at horus.sara.nl; Bob Zimmer
>> Subject:	Re: prototyping methods
>> 
>> The GC Electronics part number for the Tin plate is 22-228-A. It comes
>> in
>> two parts (liquid and powder) and costs a lot, $12.95 for enough to do
>> six
>> 4" x 6" boards. But it works well and keeps the boards from corroding,
>> even
>> if you don't build them right away. I think it's just dilute sulfuric
>> acid
>> and tin sulfate forming a super saturate solution? You just toss the
>> boards
>> in for 5 minutes and they turn a nice shade of silver. Easy but
>> expensive.
>> Any chemists on the list have the skinny on electroless plating?
>> 
>> > From: Bob Zimmer <bzimmer at voicenet.com>
>> > To: synth-diy at horus.sara.nl
>> > Subject: Re: prototyping methods
>> > Date: Monday, September 22, 1997 11:18 AM
>> > 
>> > At 03:11 AM 9/22/97 -0500, you wrote:
>> > >I use  the GC Electronics single sided pre-sensitized boards. Use a
>> layout
>> > >program that lets you make "donut" pads with a 0.010 inside
>> diameter.
>> Laser
>> > >print a positive and get a positive "stat" copy made onto clear
>> acetate
>> > >(around $8 - 12 US). I expose the board with a photoflood and
>> develop it
>> > >with the GC developer. Etchant is available a Radio Shack. The
>> local
>> > >surplus store sells #65 carbide drill bits for $0.50. Drill the
>> holes
>> with
>> > >a mototool (the donut pads will self center). Then I tin plate them
>> (also
>> > >GC). A 4"x6" board costs about $5 and takes four hours or so start
>> to
>> > >finish. Chemicals are somewhat expensive, $5 for enough developer
>> to do
>> 10
>> > >4 x 6 boards. The nice thing is, you can't tell the difference from
>> a
>> > >commercial single sided board and you can turn a prototype in two
>> days.
>> > >
>> > >Just my $0.02
>> > 
>> > Grant,
>> > 
>> > I'm curious about your tin plate process.  I tried a board awhile
>> back
>> and
>> > got nothing worthwhile.  Would you mind elaborating?
>> > 
>> > 
>> > 
>> >   >=== Bob Zimmer -- Phila, PA     bzimmer at voicenet.com ===<
>> >   >===         http://www.voicenet.com/~bzimmer/        ===<
>> >   >=== "Oat-bran noise is more likely to be an issue in ===<
>> >   >=== situations where cereal data ia concerned [:-)]" ===<
>> >   >===         Analog Dialogue - Analog Devices         ===<
>> > 
>> > 
>
>
_____________________________________________________________

                Ken Stone  sasami at blaze.net.au
                   ** Catgirl Paradise **
               <http://www.anime.net/~kens/>
         ** Australian Miniature Horses and ponies **
             <http://www.blaze.net.au/~sasami/>
_____________________________________________________________