Today's Message Index:
----------------------
1. 06:35 AM - Re: DB-25 Connectors (Robert L. Nuckolls, III)
2. 06:57 AM - Re: AMP Connector (?) Help Needed (Steve Kelly)
3. 08:03 AM - Re: Female fast on aka spade connector issues was AMP Connector (?) Help Needed (Charles Kuss)
Message 1
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| Subject: | Re: DB-25 Connectors |
At 07:03 PM 7/26/2021, you wrote:
>Solder pins can not be replaced if damaged in the future.
good point
>Solder tends to travel up the wire, meaning that the wire is
>stiff and prone to vibration fracture where the solder ends.
Same thing happens with a crimped wire. See wire
chapter in the 'Connection. Resistance to vibration
derives from low stresses induced by flexing fine
strands. But consider that it's a design goal to
form those strands into a homogeneous mass of
copper to achieve gas-tight joining. This can
be achieved by either soldering (filling all voids)
or crimping (squashing all voids).
Outcome is the same. Stress risers are created
at the transition from solid to stranded
condition. Hence, even terminals applied
with the gold standard of crimp tools will
feature INSULATION SUPPORT on the other
side of the solid-to-stranded transition.
See chapter on terminals in the 'connection.
Back shells on a d-sub are not always necessary
but never a 'bad' idea . . . whether crimping
or soldering.
> My vote is for crimped connectors. Just be sure to use a quality
> crimping tool.
Exactly. The Daniels AFM8 is one of a family of
crimp tools that accept a variety of pin-poisitioners.
They feature a crimp-depth adjustment to calibrate
the tool to the wire size/terminal combination.
See little chart on top of the positioner
calling out SELection vs. wire size/terminal
combination.
https://www.farnell.com/datasheets/1695189.pdf
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
Message 2
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| Subject: | Re: AMP Connector (?) Help Needed |
While doing the annual on my plane last year I noticed the wire connector
to the on/off switch for the strobes was almost black. I pointed a laser
thermometer onto the connector and turned on the switch. In about a minute
the temp was up over 200 F. The other end of the wire at the fuse block
was slightly discolored also. Standard amp crimp on spade connectors and
14 ga. tefzel. Trying the easy fix first, I snipped off the connectors
and replaced them. The temps calmed down. Also replaced the switch with a
higher rated one. If it happens again I will probably try soldering the
connector. If someone has a better way to connect these I would love to
hear it.
Steve
On Sun, Jul 25, 2021 at 11:23 PM David Saylor <saylor.dave@gmail.com> wrote:
> The Molex connectors that Whelen has used forever are obviously up to the
> task, but I tried running the wiring from the strobe power supply to the
> flash tubes via an Amp CPC-type connector. I'm not sure if the pins or the
> housing were the weak point, but the connector melted.
>
> If you're installing LED strobes please disregard.
>
>>
Message 3
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| Subject: | Re: Female fast on aka spade connector issues was |
AMP Connector (?) Help Needed
The issue of female "fast on" connectors losing their grip and creating a
high resistance point is generally related to the quality of the connectors
used. The connectors sold at the local auto parts stores are of inferior q
uality and often cause this sort of issue. Best to use the PIDG connectors
that Bob N. recommends.
On Tuesday, July 27, 2021, 10:31:52 AM EDT, Steve Kelly <amsk22@gmail.
com> wrote:
=C2-While doing the annual on my plane last year I noticed the wire conn
ector to the on/off switch for the strobes was almost black.=C2- I pointe
d a laser thermometer onto the connector and turned on the switch.=C2- In
about a minute the temp was up over 200 F.=C2- =C2-The other end of th
e wire at the fuse block was slightly discolored also.=C2- Standard=C2-
amp crimp on spade connectors and 14 ga. tefzel.=C2- =C2-Trying the eas
y fix first, I snipped off the connectors and replaced them.=C2- The temp
s calmed down.=C2- Also replaced the switch with a higher rated one.=C2
- If it happens again I will probably try soldering the connector.=C2-
If someone has a better way to connect these I would love to hear it.=C2-
Steve
On Sun, Jul 25, 2021 at 11:23 PM David Saylor <saylor.dave@gmail.com> wrote
:
The Molex connectors that Whelen has used forever are obviously up to the t
ask, but I tried running the wiring from the strobe power supply to the fla
sh tubes via an Amp CPC-type connector.=C2- I'm not sure if the pins or t
he housing were the weak point, but the connector melted.
If you're installing LED strobes please disregard.
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