On Fri, 31 Aug 2018 16:57:29 -0400 (EDT) Mitch Haley via Mercedes <mercedes@okiebenz.com> wrote:
> I always thought ABEC 5 = Class 5 were darn smooth bearings. > https://en.wikipedia.org/wiki/ABEC_scale > > It's the ABEC 1 stuff (class 6X) that you want to avoid. >From the page at the link above (with emphasis added), ------------------------------------------------------------------------ There are five classes from largest to smallest tolerances: 1, 3, 5, 7, 9. The higher ABEC classes provide better precision, efficiency, and the possibility of greater speed capabilities, *** but do not necessarily allow the components to spin faster. *** The ABEC rating does not specify many critical factors, such as load handling capabilities, ball precision, materials, material Rockwell hardness, degree of ball and raceway polishing, noise, vibration, and lubricant. *** Due to these factors, an ABEC 3 classified bearing could perform better than an ABEC 7 bearing. *** Bearings not conforming to at least ABEC 1 cannot be classified as precision bearings as their tolerances are too loose. The scale also works as a guide for consumers to make informed decisions about the type of bearing they desire, despite not knowing factors related to materials, manufacturing, and performance. High rated bearings are intended for precision applications like aircraft instruments or surgical equipment. *** Lower graded bearings are intended for the vast majority of applications such as vehicles, mechanical hobbies, skates, skateboards, fishing reels and industrial machinery. *** High ABEC rated bearings allow optimal performance of critical applications requiring very high RPM and smooth operation. ------------------------------------------------------------------------ Craig _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
