From: Dave Plowman (News) on
In article <op.tv6thdkeyuobwl(a)lucy.gnerwifi.train>,
Duncan Wood <newsto(a)dmx512.co.uk> wrote:
> > Indeed. A properly designed terminal crimped properly with a proper
> > tool is ideal. Those red blue and yellow devices satisfy non of those.

> Well the CEGB used to happily use AMP CertiGrips. PIDGs aren't unusual
> either. Of course if you're buying cheap nasty ones then you'll get what > you paid for.

On what type of cable? I stated earlier they work ok on solid core or
stranded mains cable - just not on flexibles as used on cars.

I'd really suggest you make a few trial ones on car cables of various
sizes then cut off the insulation and look at the result. A good crimp
grips the cable all the way round - which requires a 'heart' shaped crimp
formed by the tool. These are simply flattened.

The other thing is I dislike the look of them. They look like the bodge
they are. The proper connectors as used by the makers of looms are easily
available by mail order as are decent crimp tools. While I can accept a
one off use by an amateur of these easily available crimps there's no
excuse for pros using them.

--
*The man who fell into an upholstery machine is fully recovered*

Dave Plowman dave(a)davenoise.co.uk London SW
To e-mail, change noise into sound.
From: Dave Plowman (News) on
In article <313030303432373946ABC6B964(a)zetnet.co.uk>,
Guy King <guy.king(a)zetnet.co.uk> wrote:
> The message <YmOqi.6054$By5.115(a)text.news.blueyonder.co.uk>
> from Chris Bartram <news(a)delete-me.piglet-net.net> contains these words:

> > The fact is that if you use the solder as the electrical connection,
> > then take care of the mechanical issue, you won't have a problem.

> Proper strain relief is the key to long lived joints in vibrating
> applications. Crimped or soldered makes no odds, it's the waggling that
> kills them off. If it's soldered it'll fail where the solder stops and
> the strands are free to move, if it's crimped it'll fail where the
> bundle of strand leave the crimp.


Which is why proper car crimp terminals - of the type the makers use on
the looms from the factory - include a crimp to the insulation after the
crimp to the conductor. That's not to say this can't fail - it's common
knowledge that a connector is the weak link in any chain. But that is the
most reliable form around.

--
*You never really learn to swear until you learn to drive *

Dave Plowman dave(a)davenoise.co.uk London SW
To e-mail, change noise into sound.
From: Guy King on
The message <rcYqi.6170$By5.6081(a)text.news.blueyonder.co.uk>
from "Malc" <malwhite(a)blueyonder.co.uk> contains these words:

> When I worked for Westland Aerospace the components like resistors and
> diodes on PCBs would have loops formed in the legs to help with strain
> relief.

I always through those little wiggles were to space the component off
the board rather than sit hard down on the surface. That's certainly why
I used to do it if I had a resistor I knew was going to get warmer than
I'd like.

--
Skipweasel
We have always been at war with Iran. [George Orwell - almost]
From: Dave Plowman (News) on
In article <WtMqi.5992$By5.387(a)text.news.blueyonder.co.uk>,
PC Paul <urd2(a)bitrot.co.uk> wrote:
> Solder can be fine in it's place - but you have to be able to make a
> good mechanical joint with the bare wires *first*, before you even apply
> the solder. Which you can't really do for a butt joint.

Indeed - which is why it's unsuitable for a repair to a loom.

If jointing two cables where you have plenty spare, strip back about 30mm
separate the cores into two lots, twist those from either cable first then
twist the lot together. Then with a hot iron quickly solder only the last
5mm or so, using pliers as a heat sink to prevent the heat going up the
cables. Then insulate with glue heatshrink sleeving. You'll then have a
mechanically strong low resistance joint.

--
*Tell me to 'stuff it' - I'm a taxidermist.

Dave Plowman dave(a)davenoise.co.uk London SW
To e-mail, change noise into sound.
From: Duncan Wood on
On Sun, 29 Jul 2007 09:59:19 +0100, Guy King <guy.king(a)zetnet.co.uk> wrote:

> The message <rcYqi.6170$By5.6081(a)text.news.blueyonder.co.uk>
> from "Malc" <malwhite(a)blueyonder.co.uk> contains these words:
>
>> When I worked for Westland Aerospace the components like resistors and
>> diodes on PCBs would have loops formed in the legs to help with strain
>> relief.
>
> I always through those little wiggles were to space the component off
> the board rather than sit hard down on the surface. That's certainly why
> I used to do it if I had a resistor I knew was going to get warmer than
> I'd like.
>

You crimp the back of the leg as well if you're after vibration resistance