[Milsurplus] [ARC5] Old Dynamotors- Don't be a DooFuss Like Me....

[Thekan, Paul]

John

 No...none of those items you listed as well as any small furry creatures were to ever go into the chamber except for open winding xfmrs and armatures.

Paul


-----Original Message-----
From: J. Forster [mailto:jfor at quikus.com] 
Sent: Monday, April 01, 2013 7:30 AM
To: Thekan, Paul
Cc: milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] [ARC5] Old Dynamotors- Don't be a DooFuss Like Me....

I would not pull a vacuum on anything like:

Oil filled capacitors
Electrolytics
Batteries
Hermetic meters
Pulse forming networks

Some of these things have (now old) rubber seals and you may blow out
perfectly good stuff.

If you heat something to 130-150F the water vapor pressure will drive out
any moisture, given enough time for fiffusion. IMO, an hour or two is not
long enough.

YMMV,

-John

================



> I have a vacuum chamber oven I saved from the dumpster here at work. I
> thought I could use it to dry out xfmrs under a partial vacuum. Just need
> to find an old Welch vac pump now.
>
>  Anybody see a problem with this...as long as I do not 'implode' anything.
>
> Tnx
> Paul
> N6FEG
>
> -----Original Message-----
> From: milsurplus-bounces at mailman.qth.net
> [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of J. Forster
> Sent: Monday, April 01, 2013 7:09 AM
> To: Todd, KA1KAQ
> Cc: Military Radio Collectors Association; milsurplus; ARC-5 List
> Subject: Re: [Milsurplus] [ARC5] Old Dynamotors- Don't be a DooFuss Like
> Me....
>
> For years, I've always baked out stuff with non-hermetic magnetics.
>
> I put the thing on a few bricks, put a couple of 100 Watt incandescent
> lamps underneath it, and a big cardboard box with some holes in the top
> over it, and let it sit for a week or more.
>
> You want the thing to get up to about 130F for several days, at least.
> Longer is better, IMO.
>
> YMMV,
>
> -John
>
> ==============
>
>
>> On Mon, Apr 1, 2013 at 12:50 AM, David Stinson <arc5 at ix.netcom.com>
>> wrote:
>>
>>>
>>>
>>> I thought about putting the whole thing sans end bells into a
>>> 200-degree
>>> oven for a couple of  hours to dry it out
>>>
>>
>> This is  a problem with big chunks of iron in old transmitters, too.
>> Many
>> do not realize how similar to a sponge the laminations and windings are.
>> And old transformer left sitting in a damp cellar or storage shed is an
>> accident waiting to happen if you just haul it out, hook it up, and
>> apply
>> voltage. Might happen in 5 seconds, 5 hours, or 5 days, 9.9999 times out
>> of
>> 10 it'll zorch.
>>
>> The oven works great as is provides a means of getting rid of the
>> moisture
>> without introducing more. On bigger pieces it can take a day or two,
>> maybe
>> more, to feel safe enough to put power to it. And there's never a
>> guarantee, of course. But recovery rate is far, far better when dried
>> out
>> than when not. The trick is to heat it up long enough for the heat to
>> reach
>> the core and drive out the moisture. It's all about the mass. Smaller =
>> faster; hours vs days.
>>
>>
>> A good reminder as many of my dynamotors are out in the garage here in
>> humid NC. Though lately humidity has been amazingly low.
>>
>> ~ Todd,  KA1KAQ/4
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