This is a common misconception!
One major issue in low speed, intermittent use bearings is that the grease gets
moved out from under the balls (rollers if roller bearings), and
shock/vibration starts to cause fretting issues.
I think it was in the 50s or 60s, where Ford Motors started having a major
issue with front wheel bearings failing. The did some testing, and the found
that the bearings took more wear and damage from this fretting in shipping by
rail than they did in 100,000 miles of driving! (The answer was to block up the
front suspension to take the weight off the bearings)
Anyway, the moral is that low speed/intermittent use is a totally different
load/wear system than a regularly rotating system, and turns out that things
like sintered bronze, or these days, engineering plastics work better
--
73 de KG2V
Charlie
On Aug 11, 2022, at 5:03 AM, Stan Stockton <wa5rtg@gmail.com> wrote:
Jim,
They are sealed and assume made to last for a long time running at high speed in other
applications. I don’t know but would assume in this light duty application they would
last a lifetime. You can’t tell the performance is not like new from your spin test.
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