I have acquired 4 Sperry marine gyro compasses, which I am refreshing. Part of the task is thorough cleaning and the replacement of the suspension oil in the gyrosphere, as well as complete recalibration. According to Sperry, the suspention fluid is a blend of Halocarbon 6.3 oil
Halocarbon oil and test of reason
It sounds about as pricy as synthetic vacuum pump oil. Small market, large R&D investment, the people that need it are willing to pay the price.
If this is the same as Krytox pump fluid used for oxygen service, do not be suprised. That stuff is *expensive*.
Jim
We used to use similar in seal legs for d/p cells on orifice flow meters (I dislike orifice flow meters). It's very inert, very dense oil, which helped it stay put in seal legs. Ours was expensive back in the '70's.
Pete Keillor
You might want to search for cashew oil (caju). I remember it being used for very close tolerance lubrication at NASA.
cheers T.Alan
Hi Steve,
I've been thinking about your pricey predicament. Perhaps the best option at this point would be to take them to a shop that refurbishes these gyro professionally. They're probably the only one who purchase enough of this stuff in volume to make the price bearable. You may also consider sending them out of country; it might be cheaper to have them done in the US.
Regards, Michael
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