What's the proper sequence / level of hardness between ball bearing, cup,
and cone?
Which is hardest then on down to softest for ease of replacement and cost?
Ted Ernst
Palos Verdes Estates
CA USA
> Reid Fisher wrote:
>
>> You metallurgists: what's the mechanism (at the micro scale) for
>> pitting? Does it start at some kind of micro-irregularity in the
>> bearing where stress is concentrated?
>
> According to Jobst Brandt, the pitting is caused by fretting due to
> lubrication failure. In the absence of effective lubrication,
> microscopic welds form between the balls and the cones; when these are
> torn apart by rotation of the wheel, pieces of the cone material come
> with it, leaving a pit. Once a pit forms, it will tend to grow and spread.
>
> --
> John (john@os2.dhs.org)
> Appleton WI USA