 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
dean.psiropoulos(at)veriz
Guest
|
 Posted: Mon May 14, 2007 7:41 pm Post subject: Connetor Shells-Loctite |
 |
|
Question on keeping the screws and nuts from coming apart on the DB-25 and
computer style connector shells and wire clamps. I tried some blue locktite
and it seemed to work fine but I was wondering if Locktite is needed or if
just installing the screws and nuts dry (but tight) is sufficient? Seems
trivial but I don't want the hardware coming apart and falling into my lap
while I'm flying (and I don't want to have to crawl up behind the panel to
put things back together once the airplane is finished).
Also, following Bob's tenet of not using wire smaller than AWG-22 has left
me with some large bundles coming out of the DB-25 connectors, especially on
the back of the VOR/ILS indicator and the Dynon EFIS. I couldn't use the
supplied bundle clamp/strain reliever because the bundle was too large so I
ended up using half the clamp and a tie wrap through the two screw holes for
strain relief. I wrapped some vinyl tape around the bundle at that point to
stave off chaffing the Tefzel insulation of the bundle. Seems kind of
kludgey to me though, any words of wisdom on good ways to protect the
bundles inside the connectors while providing decent strain relief? Thanks.
Dean Psiropoulos
RV-6A N197DM
Installing radio harnesses
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
 |
bob(at)bob-white.com
Guest
|
| Posted: Mon May 14, 2007 7:57 pm Post subject: Connetor Shells-Loctite |
|
|
Hi Dean,
I've never used anything on the threads and I've never seen one come
apart. What I've found to work really well for the strain relief is to
wrap the cable where it exits the backshell with silicone fusion tape
until it's slightly larger than the hole. Then tighten the backshell
over it. It make a snug fit and protects the wires at the same time.
The tape turns into a solid plug but it's easily cut away if you need
to work on it later.
Bob W.
On Mon, 14 May 2007 23:40:00 -0400
"DEAN PSIROPOULOS" <dean.psiropoulos(at)verizon.net> wrote:
| Quote: |
Question on keeping the screws and nuts from coming apart on the DB-25 and
computer style connector shells and wire clamps. I tried some blue locktite
and it seemed to work fine but I was wondering if Locktite is needed or if
just installing the screws and nuts dry (but tight) is sufficient? Seems
trivial but I don't want the hardware coming apart and falling into my lap
while I'm flying (and I don't want to have to crawl up behind the panel to
put things back together once the airplane is finished).
Also, following Bob's tenet of not using wire smaller than AWG-22 has left
me with some large bundles coming out of the DB-25 connectors, especially on
the back of the VOR/ILS indicator and the Dynon EFIS. I couldn't use the
supplied bundle clamp/strain reliever because the bundle was too large so I
ended up using half the clamp and a tie wrap through the two screw holes for
strain relief. I wrapped some vinyl tape around the bundle at that point to
stave off chaffing the Tefzel insulation of the bundle. Seems kind of
kludgey to me though, any words of wisdom on good ways to protect the
bundles inside the connectors while providing decent strain relief? Thanks.
Dean Psiropoulos
RV-6A N197DM
Installing radio harnesses
|
--
N93BD - Rotary Powered BD-4 - http://www.bob-white.com
3.8 Hours Total Time and holding
Cables for your rotary installation - http://www.roblinphoto.com/shop/
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
|
jim jewell
Joined: 09 Jan 2006
Posts: 82
Location: Kelowna B.C. Canada
|
| Posted: Mon May 14, 2007 9:24 pm Post subject: Connetor Shells-Loctite |
|
|
Hi Dean,
As for securing DB connectors:
Due to vibration the engine DB 9 connector for the Lightspeed EI hall effect
unit was one place that I felt needed to be secured beyond just dry
tightening the screws.
I thought Locktite might make removal for servicing a headache.
After tightening the screws I used .016 safety wire laid over the screw
slots and then twisted tight.
This aproach of course would only be useful in areas where there is room for
relatively easy physical access.
Build on,
Jim Jewell in Kelowna - RV6A 10 plus hr. into the flight testing
---
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
_________________
"I never make mistreaks" |
|
| Back to top |
|
|
john(at)ballofshame.com
Guest
|
| Posted: Tue May 15, 2007 1:50 am Post subject: Connetor Shells-Loctite |
|
|
I wouldn't loctite them. The screws they come with are quite crappy and
you run the real risk of stripping the heads just trying to get them out
again. The screws are light so I'd be surprised if they'd loosen on
their own, even under heavy vibration. So maybe I'm missing something
here but my gut would say just cinch them down and call it a day.
I wonder what A&P's are trained to do? I wonder what Bob and Stein do?
hmmmmmm.
-John
www.ballofshame.com
DEAN PSIROPOULOS wrote:
| Quote: |
Question on keeping the screws and nuts from coming apart on the DB-25 and
computer style connector shells and wire clamps. I tried some blue locktite
and it seemed to work fine but I was wondering if Locktite is needed or if
just installing the screws and nuts dry (but tight) is sufficient? Seems
trivial but I don't want the hardware coming apart and falling into my lap
while I'm flying (and I don't want to have to crawl up behind the panel to
put things back together once the airplane is finished).
Also, following Bob's tenet of not using wire smaller than AWG-22 has left
me with some large bundles coming out of the DB-25 connectors, especially on
the back of the VOR/ILS indicator and the Dynon EFIS. I couldn't use the
supplied bundle clamp/strain reliever because the bundle was too large so I
ended up using half the clamp and a tie wrap through the two screw holes for
strain relief. I wrapped some vinyl tape around the bundle at that point to
stave off chaffing the Tefzel insulation of the bundle. Seems kind of
kludgey to me though, any words of wisdom on good ways to protect the
bundles inside the connectors while providing decent strain relief? Thanks.
Dean Psiropoulos
RV-6A N197DM
Installing radio harnesses
|
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
|
nuckollsr(at)cox.net
Guest
|
| Posted: Tue May 15, 2007 3:48 am Post subject: Connetor Shells-Loctite |
|
|
At 11:40 PM 5/14/2007 -0400, you wrote:
| Quote: |
<dean.psiropoulos(at)verizon.net>
Question on keeping the screws and nuts from coming apart on the DB-25 and
computer style connector shells and wire clamps. I tried some blue locktite
and it seemed to work fine but I was wondering if Locktite is needed or if
just installing the screws and nuts dry (but tight) is sufficient? Seems
trivial but I don't want the hardware coming apart and falling into my lap
while I'm flying (and I don't want to have to crawl up behind the panel to
put things back together once the airplane is finished).
|
We've used D-Subs on the airplanes and our targets for
as long as anyone can remember and we've never "secured"
the mating screws beyond snugging them up dry.
The screw mass is exceedingly small and the thread pitch
very flat (40 tpi) so any tendency to loosen under vibration
is simply too small to overcome friction.
| Quote: | Also, following Bob's tenet of not using wire smaller than AWG-22 has left
me with some large bundles coming out of the DB-25 connectors, especially on
the back of the VOR/ILS indicator and the Dynon EFIS. I couldn't use the
supplied bundle clamp/strain reliever because the bundle was too large so I
ended up using half the clamp and a tie wrap through the two screw holes for
strain relief. I wrapped some vinyl tape around the bundle at that point to
stave off chaffing the Tefzel insulation of the bundle. Seems kind of
kludgey to me though, any words of wisdom on good ways to protect the
bundles inside the connectors while providing decent strain relief? Thanks.
|
Leave the clamp hardware off. Wrap the bundle with silicone rubber
tape like:
http://tinyurl.com/32uywo
Put enough tape around the wires that the backshell halves
put a grip on the bundle when assembled to the connector.
Finally, the notion of avoiding 24AWG wire is strongest
for airframe systems were individual small wires are routed
around the airplane for various tasks. If you're building
short bundles of multiple wires for avionics, 24AWG
is fine if you're comfortable with it. It's generally to
flexible to allow seating a d-sub pin in the housing by
pushing on the wire. You'll probably have to use the insertion
tool to seat pins.
Bob . . .
----------------------------------------
( "Physics is like sex: sure, it may )
( give some practical results, but )
( that's not why we do it." )
( )
( Richard P. Feynman )
----------------------------------------
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
|
nuckollsr(at)cox.net
Guest
|
|
| Back to top |
|
|
echristley(at)nc.rr.com
Guest
|
| Posted: Tue May 15, 2007 5:07 am Post subject: Connetor Shells-Loctite |
|
|
DEAN PSIROPOULOS wrote:
| Quote: |
Question on keeping the screws and nuts from coming apart on the DB-25 and
computer style connector shells and wire clamps. I tried some blue locktite
and it seemed to work fine but I was wondering if Locktite is needed or if
just installing the screws and nuts dry (but tight) is sufficient? Seems
trivial but I don't want the hardware coming apart and falling into my lap
while I'm flying (and I don't want to have to crawl up behind the panel to
put things back together once the airplane is finished).
|
I bought clips that you screw onto the dSub connectors. Then a springs
holds them together. It is like the clips that used to be on the
Centronics end of your printer cable. With these, you could epoxy the
screws into place.
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
