Jelly crimps /gel crimps

[mcalan]

Do jelly crimps/gel crimps work On multi strand wire?

 

[Alpha22]

They work up to a point, but not ideal as vibration will eventually break the stands and it will loose it's grip.

 

[mcalan]

Would tinning them help ?

 

[sarabande]

BT use them on both stranded and solid wire. They have recently put in new phone cables with several junction boxes and gels.


You can buy several different types, so I guess it's important to match the type and the operating environment.

 

[bitbaltic]

Do jelly crimps/gel crimps work On multi strand wire?

In my experience I have never had one fail and I have the whole NMEA loom (stranded wire) wired with them. I think they're brilliant. Like anything just don't ask too much in terms of tension on the wires etc, just be sensible.

cheers

 

[Lon nan Gruagach]

Jury is out on stranded cable where there is vibration. Theoretically the jelly (an epoxy glue) should prevent any issues. BT see fit to use tham as there is precious little vibration in a junction box.

Tinning, if not in a soldered connection should be the absolute minimum. In any kind of physical connector, screw, crimp or IDC (jelly crimps/ automotive splice etc), excess solder will flow (its ductile) and ease off any/all crimping pressure and cause an unreliable/high resistance joint.

 

[mcalan]

I intend to use them to join the wire from a plastimo speed temerature transducer to an existing loom. As I can't find the original multi plug as its hidden behind a bulkhead and inaccessible.
If possible I will tinn the wire before crimping .

 

[Spyro]

BT use them on both stranded and solid wire. They have recently put in new phone cables with several junction boxes and gels.


You can buy several different types, so I guess it's important to match the type and the operating environment.

BT don't use multi stranded wire except in Telephone cords and handset cables. gel filled crimps are insulation displacement connectors i.e. they cut into the cable without need for stripping it. The problem is they cut into the conductor and will actually cut through strands of a multi stranded cable.

 

[<152587>]

Jury is out on stranded cable where there is vibration. Theoretically the jelly (an epoxy glue) should prevent any issues. BT see fit to use tham as there is precious little vibration in a junction box.

Tinning, if not in a soldered connection should be the absolute minimum. In any kind of physical connector, screw, crimp or IDC (jelly crimps/ automotive splice etc), excess solder will flow (its ductile) and ease off any/all crimping pressure and cause an unreliable/high resistance joint.

Solder on multi strand cable is a definite no,no. The solder wicks back the cable and forms a "hard spot" where failure can take place due to vibration work hardening the copper conductors. It is for this reason that all wiring on aircraft are terminated with crimps and never ever soldered.

 

[nigelmercier]

...If possible I will tinn the wire before crimping .

As said above, not a good idea. I would twist and solder the wires, then cover with heat shrink.

 

[lw395]

.......all wiring on aircraft are terminated with crimps and never ever soldered.

That's not actually true.
But...
Any solder or crimp connection is a stress raising point, the cable needs to be well secured to avoid fatigue.

 

[Pete735]

Sorry third engines but as lw395 says soldering was used on aircraft at one time, the second world war and mass production changed process not vibration failures, my late Dad worked for de Havilland before and during the war and was very clear about this.

 

[abraxus]

Do jelly crimps/gel crimps work On multi strand wire?

3M do gel crimps (no 314) which are apparently designed for stranded as well as solid wire, tinned or untinned.

http://www.farnell.com/datasheets/63120.pdf