26-02-2019, 01:18 AM
David,
"As I said in my previous post, I think is has become brinelled. when you rotate it, it feels sometim.es smooth and other times rather rough."
'Brinelling' (named after the Brinell hardness test) is only caused by exceeding the static capacity of a bearing by overloading when stationary- usually through fitting when a hammer blow drives the ball (or unusually the roller) into the track, indenting it.
Not to be confused by 'false brinnelling' which can look similar at first glance. This is often caused when a stationary bearing is subject to vibration which can happen to wheel bearings when carrying autos on train flatcars for long distances.
The cause of roughness in a roller bearing is sometimes caused by sliding the rollers across the track under load causing a 'score' on the track when assembling the bearing on the shaft and into the housing.
Bob has mentioned a grey surface on the roller track- caused by wear from dirt in the oil.
Tony.
"As I said in my previous post, I think is has become brinelled. when you rotate it, it feels sometim.es smooth and other times rather rough."
'Brinelling' (named after the Brinell hardness test) is only caused by exceeding the static capacity of a bearing by overloading when stationary- usually through fitting when a hammer blow drives the ball (or unusually the roller) into the track, indenting it.
Not to be confused by 'false brinnelling' which can look similar at first glance. This is often caused when a stationary bearing is subject to vibration which can happen to wheel bearings when carrying autos on train flatcars for long distances.
The cause of roughness in a roller bearing is sometimes caused by sliding the rollers across the track under load causing a 'score' on the track when assembling the bearing on the shaft and into the housing.
Bob has mentioned a grey surface on the roller track- caused by wear from dirt in the oil.
Tony.