[TowerTalk] Experience with K0XG guy ring bearings?

[Grant Saviers]

Charlie is correct.  This is why a rotator should be moved on a regular 
basis so the balls move enough to replenish the grease between the ball 
and race.  The damage is quite obvious in SK owned rotators that have 
not moved in a long time.  Divots are in the races and hairline cracks 
are visible under magnification in the surface of balls and races.

Exotic grease helps a lot, original HyGain did use it for a while and 
sold a 1oz cup for ~$30.

Grant KZ1W

On 8/11/2022 03:53, Charles Gallo wrote:
> 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 at 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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