which cage to use
which cage to use
(OP)
I have a choice to buy bearing for electrical motor 1500 RPM with brass cage or polyamid cage.
1) 7322 BECBM Angular Contact ball bearing single row "Brass Cage".
2) 7322 BECBP Angular Contact ball bearing Single row "Polyamide Cage".
What is the criteria I need to consider? I appreciate your advice.
1) 7322 BECBM Angular Contact ball bearing single row "Brass Cage".
2) 7322 BECBP Angular Contact ball bearing Single row "Polyamide Cage".
What is the criteria I need to consider? I appreciate your advice.





RE: which cage to use
Once initiated, polymide cage failure accelerates quite quickly - when the rolling elements come in to contact the bearing failure is extremely quick, with a good deal of heat being generated, giving a potential fire hazard.
Polymide cages cannot be used at temperatures above 120 degC
We replaced all bearings with polymide cages with ones fitted with brass cages - failures are more gentle and easily picked up with a routine vibration monitoring programs. When a brass cage fails, it often releases huges number of tiny brass particles which discolour the lube oil - another indication of failure that is easily picked up. Brass is OK up to 300 degC but should not be used in an environment wher eit may come into contact with ammonia.
RE: which cage to use
RE: which cage to use
Russell Giuliano
RE: which cage to use
-Speed, load, vibration, temp, noise, chemical environnement, lubrication and of course price.
NSK precision book gives a good general description of the different advantages of cages.
RE: which cage to use
Brass is usually chosen for such applications. I would chose brass. There are reports (rumours?) that polyamide fails catastrophically without much warning in the vibration spectrum.
Gunnar Englund
www.gke.org
RE: which cage to use
RE: which cage to use