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4 hours -- no real problems
The motors stopped getting hotter after about 20 minutes (based on my calibrated hand ;-).
After that, the motor just ran and ran.
After 4 hours I stopped the test and took the motor apart again.
Nothing changed really on the inside other than it was clear that the oil impregnated bearing dripped a bit of its oil down the inside of the end cap.
I suppose that everything will be just fine with these bad boys.
Joe J.
P.S. In another note, someone asked in a separate note whether it was safe to press something onto the motor shaft. I think so. The shaft is a 8mm shaft all the way through the motor. The back of the shaft is held against the inside wall of the casting. I think as long a you don't go crazy with a very tight press fit you should be fine. But... ...as always, your mileage may vary.
Joe J.
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