[Milsurplus] Unsoldered joints...

[Peter Gottlieb]

On high current gear, bus connections are torqued then a paint marker stripe applied. Inspection consists of verifying Belleville washers are flat then checking torque then applying another stripe in another color. Then later high current applied and voltage drop and thermal imaging verifies. 

Miss one and you end up with very expensive repairs and angry customers. 


Peter

> On May 15, 2017, at 12:03 PM, Al Klase <ark at ar88.net> wrote:
> 
> Gang,
> 
> I've also seen equipment where there was a dab of paint on each joint, indicating that it had been inspected.  Presumably, a subsequent inspection checked on the dabs.  That's the kind of thing that is required to assure reliability.
> 
> Al
> 
>> On 5/15/2017 11:44 AM, w4thq at cox.net wrote:
>> During the 1960's, NASA issued a Soldering Spec. that eliminated twisting wires around terminals.  The requirement for making solder joints that depended only on the solder making the connection allowed bad terminations to be readily identified.
>> John  W4THQ
>> 
>> 
>> 
>> ---- "Kenneth G. Gordon" <kgordon2006 at frontier.com> wrote:
>> 
>> =============
>>> On 15 May 2017 at 7:25, George Babits wrote:
>>> 
>>> Un-soldered joints happened all the time.  Nothing unique to surplus, or any
>>> specific radio.  I had a Collins 32S-1 with an un-findable intermittent.
>>> Finally found that one connection INSIDE one of the IF transformers had
>>> never been soldered.
>> When I was working as an electronic tech at the University of Montana, one of our professors
>> had a very, very expensive Phillips research X-ray machine which would intermittantly shut
>> down.
>> 
>> That thing had something like 90 tubes in it.
>> 
>> After a long night of digging into it, I found a no-solder joint on a filament connection to a
>> critical tube socket in the power supply section buried at the very bottom of the unit, under at
>> least 4 layers of wiring.
>> 
>> I was pissed and the professor was pleased.
>> 
>> Ken W7EKB
>> 
>> ---
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> 
> -- 
> Al Klase – N3FRQ
> Jersey City, NJ
> http://www.skywaves.ar88.net/
> 
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