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stein(at)steinair.com
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 Posted: Mon Jan 04, 2021 2:50 pm Post subject: D-Sub High Density 78 female - solfder or crimp contacts |
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We generally try to avoid solder cup connectors on aircraft because typically the average builder doesn’t have a good high temp yet small iron able to successfully use the solder cups (wires often end up cold soldered and fall off in with future vibration), or they end up wicking tons of solder up into the wire that inevitably leads to wire breakage.
On top of that, in a 78 pin arrangement the solder cups would be incredibly densely packed, and it’s likely the end result would not be pretty. It also takes longer than simply crimping on a pin and inserting it into a connector. Also, if you need to “move” a wire in the middle of that large 78 pin connector, it’s pretty easy to do with crimp pins, not so much with solder cups.
Lastly, the 78 pin crimp connectors aren’t that terribly expensive (we stock and sell them for about $17 each), standard crimp tooling works well.
Just my 2 cents as usual!
Cheers,
Stein
From: owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com) <owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com)> On Behalf Of rd2
Sent: Monday, January 4, 2021 3:38 PM
To: aeroelectric-list(at)matronics.com (aeroelectric-list(at)matronics.com)
Subject: AeroElectric-List: D-Sub High Density 78 female - solfder or crimp contacts
Hi Group.
What type contacts would you recommend for a 78 female connector - solder or crimp, and why?
It seems that solder type are easier to find and less expensive.
The connector will be used for a relays box to select VHF nav signals to an HSI.
Rumen....
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Ceengland
Joined: 11 Oct 2020
Posts: 391
Location: MS
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| Posted: Tue Jan 05, 2021 6:04 am Post subject: D-Sub High Density 78 female - solfder or crimp contacts |
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If you're having trouble crimping subD pins, you likely have the wrong tools for the task. I've been soldering for over 50 years (a lot of them professionally), and crimping is still easier/faster (though more expensive) than soldering for me. Harder for me is accurately stripping the wire to prep for the crimp. A decent quality stripping tool with dies sized for each gauge wire (I like this style) seems essential, and a good eye for strip length helps (to ensure full depth of bare wire into the terminal, without leaving excess bare wire exposed). I've never had good luck with the 'automatic' strippers, but I've never invested in a new, really high quality version. The crimp itself is 'automatic'; as long as the terminal is the proper depth into the crimper, the tool forces you to make a full crimp before releasing. BTW, you really don't need to spend $hundreds on a production crimper for one project. Stein and others sell this tool which many of us have used to wire entire a/c. Since you're using HD pins, you might want the optional HD positioner, though I've had good success manually positioning the pin when I've only needed to do a couple at a time.
I'll bet you will have much more trouble depinning the old shell (you need this tool) than crimping the new pins.
Charlie
On Tue, Jan 5, 2021 at 7:28 AM rd2 <rd2(at)dejazzd.com (rd2(at)dejazzd.com)> wrote:
[quote]Excellent advice, as usual, thanks Stein. Crimped it'll be.
The problem was my soldering skills are much better than my crimping skills (almost none).
Thanks for bringing up the questions, Bob:
--snip--
Do you already have the connector to which you want
add wires? How many wires total in your task?
---snip---
I already have the female connector - it is populated from another application. I assume that I can reuse it - just need to remove the populated contact sockets, crimp the new ones and repopulate.
I don't now the exact number of wires yet, I expect most (or more than 1/2) of the positions to be used.
I will visit Stein's web site to order sockets and tools, but first I need to find some mp4 on youtube that will guide me through the process instead of asking questions.
Thanks again.
Rumen
---
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