A Beogram 4002 DC platter motor arrived from California for restoration. This shows the motor as received:
I disassembled it to extract the Oilite brass bearings for oil infusion:
The bearings are the two small donuts on the black pad up front. I immersed them in motor oil and pulled a vacuum:
Immediately, strong bubbling started indicating that air was being extracted from the bearing to make room for oil diffusion into the porous material. After about 3 days the bubbling stopped and I extracted the bearings from the oil bath:
I reassembled the motor and installed it into one of my Beogram 4002s for performing a 24 hrs RPM stability test with my BeoloverRPM device:
This is the curve I measured:
This is pretty much as good as it gets with Beogram 4002 DC motors. This motor is back in business!
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