ToyMaker
06-30-2007, 10:53 AM
ABEC stands for Annular Bearing Engineers' Committee. This
committee works to determine the standards for bearings for
the Anti-Friction Bearing Manufacturers Association (AFBMA).
The ABEC scale classifies different accuracy and tolerance
ranges for bearings. The first column of this table lists the five
ratings in the ABEC scale.
ABEC Ratings ISO Class
ABEC1 Class 0
ABEC3 Class 6
ABEC5 Class 5
ABEC7 Class 4
ABEC9 Class 2
The ABEC rating of a bearing is determined by the following
(for a 608 size bearing):
How close the bore is to 8mm in microns
How close the outer diameter is to 22mm in microns
How close the width is to 7mm in microns
The runout in microns
The second column of the table lists the corresponding tolerance
classes as defined by ISO, the International Organization for
Standardization. Both systems are widely used in the bearing
industry but ABEC has been adopted by skate manufacturers.
Does ABEC affect the speed of your machine?
No. Not unless your table is moving at 330 mph. That's based on
a 608 bearing limiting speed of 32,000 rpm. Only in extremely high
speed applications like ultra high speed motors and precision
measuring instruments can bearings above ABEC 1 affect performance. Regardless of how fast you plan to go, speed is affected first
and foremost by the motors and drives.
robotic regards,
Toymaker
= = = = =
"Our simplest perfection as human beings is simply being human."
- - John M. Kohlenberger
www.wallaceoperation.com
committee works to determine the standards for bearings for
the Anti-Friction Bearing Manufacturers Association (AFBMA).
The ABEC scale classifies different accuracy and tolerance
ranges for bearings. The first column of this table lists the five
ratings in the ABEC scale.
ABEC Ratings ISO Class
ABEC1 Class 0
ABEC3 Class 6
ABEC5 Class 5
ABEC7 Class 4
ABEC9 Class 2
The ABEC rating of a bearing is determined by the following
(for a 608 size bearing):
How close the bore is to 8mm in microns
How close the outer diameter is to 22mm in microns
How close the width is to 7mm in microns
The runout in microns
The second column of the table lists the corresponding tolerance
classes as defined by ISO, the International Organization for
Standardization. Both systems are widely used in the bearing
industry but ABEC has been adopted by skate manufacturers.
Does ABEC affect the speed of your machine?
No. Not unless your table is moving at 330 mph. That's based on
a 608 bearing limiting speed of 32,000 rpm. Only in extremely high
speed applications like ultra high speed motors and precision
measuring instruments can bearings above ABEC 1 affect performance. Regardless of how fast you plan to go, speed is affected first
and foremost by the motors and drives.
robotic regards,
Toymaker
= = = = =
"Our simplest perfection as human beings is simply being human."
- - John M. Kohlenberger
www.wallaceoperation.com