By popular request (really, I got quite a few emails about this!...;-), I finally completed my Beogram DC motor restoration video! It demon...
Wednesday, November 6, 2019
Beogram 4002 DC Motor Restoration
A Beogram 4002 DC platter motor in need of restoration arrived recently from Australia. This shows the motor as I received it:
I took it apart to get the bearings out for oil infusion:
The bearings are the two small donuts on the black pad. I immersed them in motor oil and pulled a vacuum. Immediately strong bubbling started:
The bubbling indicates that air is being drawn from the pores of the Oilite bearing material to make room for diffusing oil. After about 72 hours the bubbling stopped and I extracted the bearings from the oil:
Then it was time to reassemble the motor for a RPM stability test in one of my Beogram 4002s:
I ran a ~24 hrs measurement with my BeoloverRPM device. This is the curve that I measured:
This is pretty much as good as it gets with the DC motor of a Beogram 4002. This motor is ready for duty again!