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.Precision/ABEC |
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Dimensions precision -
Balls
precision -
Raceways precision and superfinishing -
Cage
precision |
Dimensions
precision
This is the main challenge for mass production. How can one ensure to
make millions of bearings to exactly the same dimensions? It is very
tough, if not impossible! Therefore, we have to accept that each bearing
has dimensions with a small allowed deviation, called tolerance.
Tolerances describe precision manufacturing capability; the smaller the
tolerance, the more precise is the bearing. Tolerances have been
classified to usual standards like ISO or ABEC. You must have heard
about ISO! ISO means International Standards Organization and is used.
You might have heard about ABEC? ABEC Means Annular Bearing Engineering
Committee and is the standards organization for bearings in USA Both
standards give fixed values for tolerances to bearings, depending on the
size. Look at the table giving values for bearing 608 according to ABEC
standards. Click here
Balls precision
For regular and precise rotating, ball precision is important. It also
decreases the friction in the bearing. For example, balls used in a 608
bearing do not differ more than ½ micron in diameter from one to another.
Raceways precision and superfinishing
Raceways must be precise to ensure precise ball guidance and good
bearing behaviour. ISO or ABEC standards (see table before) state values
for some parameters The raceway quality is also determined by the
quality of the surface finishing, depending on many parameters related
to SKF know-how. Want to know more? Contact us!
Cage precision
Cage precision is really important as to avoid friction between balls
and the cage body. Cage precision also allows a very precise ball
dispatch between the rings to ensure regular load distribution in the
bearing. |
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