Three ways
Firstly you need a wave soldering machine that can produce a stable wave
deep enough to take the pins.
Next one that can preheat the boards.
Then traditionally a high solids resin flux (so it stays effective
through the wave)
Then you fiddle around with wave shapers, speed, temps and so on so the
little flags point down on exit from the wave.
You will need to be able to clean the boards after because of the high
solids flux. Or put up with the flypaper effect of the remaining resin.
The other way is to drop a solder washer onto each pin (you can easily
make some soft AL and simple jigs to do this simply) then you heat to
reflow the pins. Ideally you put the whole thing into a vapour phase
machine to heat everything up uniformly. For this you need to make sure
the connector bodies can take the reflow heat.
The third way is to ask TechNet for a specialist backplane soldering
company to make themselves known!
Regards
Mike Fenner
Indium Corporation
T: + 44 1908 580 400
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Thursday, March 11, 2004 3:37 PM
To: [log in to unmask]
Subject: [TN] How would you solder this Backplane?
Mornin' All!
One of the guys from our bid department asked me to come and look at a
backplane we're bidding on, and tell him how we would solder it? I went
and looked at it, and I'm not sure how we would. Go to
http://www.stevezeva.homestead.com
and take a look at Backplane Topside, Backplane Backside, and Backplane
Backside Leads.
The leads for all the connectors protrude at least a half inch or longer
out the bottom of the board. I'm assuming they are that long because
they get wire wrapped after the backplane is assembled. But how do you
solder something like that? Some sort of dip solder pot? Drag solder? I
don't think I'm going to be able to solder a board with leads that long
in our Electra wave solder.
I can tell board was mass soldered, and I'm thinking it was dipped
somehow. Because you can see tiny little peaks on most of the lead tips
that go straight up and down. Is there such thing as some sort of dip
solder machine?
Sorry for all the dumb questions, but I've never been around a backplane
like this, and don't really know how something like this gets built.
Thanks!
-Steve Gregory-
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