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March 2004

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Subject:
From:
Brian Ellis <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 11 Mar 2004 18:13:36 +0200
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IMHO, not a good idea to tin wire wrap "spikes". The sharp corner should
penetrate the wire slightly to provide an intimate interface that cannot
oxidise. The one time I had a job like that, we used preforms on each
spike and reflowed in an IR oven. The stamped preforms were in the form
of strips of "washers" at 0.156" pitch with the stem between each washer
fairly thin. We had to apply the flux to the board before threading the
preforms. We made them ourselves using solid solder strip as the
starting point. If I had to do it today, I think I'd dispense a blob of
solder paste (it didn't exist in the late 60s) with an X-Y-Z dispenser.
Fortunately, we had only about a dozen to make, but each one had over
10,000 spikes from the back of connectors. The only "wiring" on the
single-sided 2.4 mm PCB was the power connections (I think ±15 V for
analogue and +5 V for digital plus the two grounds). All the signal
wiring was wire-wrapped.

Brian

Steve Gregory wrote:
> 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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