[Milsurplus] Rusted parts help?

[Peter Gottlieb]

Do it warm. Soak for at least a day, ultrasonic ally clean with water, then repeat evaporust. You may need to do this a bunch of times. 


Peter

> On Jun 6, 2014, at 12:33 PM, Glenn Little <glennmaillist at bellsouth.net> wrote:
> 
> A solution called EvapORust.
> This works at the ionic level and will only attack the rust.
> This can be had at most auto parts stores, Tractor Supply and Harbor Freight.
> I have used this and am very pleased.
> 
> 73
> Glenn
> WB4UIV
> 
> 
> 
> At 02:21 PM 6/6/2014, hwhall at compuserve.com wrote:
>> One of the WWII restoration projects at the museum is a bunch of large impulse driven (slave) clocks we wish to return to operation (I've gotten a couple running so far) . The problem we have that I hope you all can help solve is that many of the concentric shafts for the minute hand and hour hand are seized (i.e., solid minute hand shaft inside tubular hour shaft). The shafts are concentric for about two inches length, with about 3/8 inch overall outside dia. The two shafts were a very close fit originally and are now pretty solidly stuck.
>> 
>> I've tried Liquid Wrench but it doesn't seem to be able to penetrate. I've tried placing the assembly in my zero-deg freezer for a couple days & then hitting the outer hour shaft with a propane flame for several seconds, then tapping on the inner shaft. So far, nothing gives. I can't hammer very hard, the rest of the assembly won't take the abuse.
>> 
>> Is there something that penetrates better than Liquid Wrench? If no, then I think my next attack will require packing one end of the inner shaft in dry ice with the flame applied to the outer shaft, in the hope that the reason it failed before was the inner took heat from the outer too quickly.
>> 
>> Any other ideas??
>> 
>> Thanks!
>> 
>> Wayne
>> WB4OGM
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