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Comparison of Air Bearing & Ball Bearing
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Comparison of Air Bearing & Ball Bearing

   
- Rolling type by steel ball or roller.

-
Peripheral structure of bearing is simple.

-
Use in either high temperature or low temperature is comparatively easy.

-
Can increase stiffness of bearing by preloading.

-
International standards and specifications have been established.

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Friction heat takes place by contact when ball rolls.

-
Ball and out of roundness of orbital plane are very important.

-
High speed spinning is not possible.
- Spindle levitates by compressed air.

-
In high speed rotation, heat by shearing resistance
of air film hardly takes place as viscosity of air which
is working fluid is very low
(1/100 ~ 1/5000 of viscosity of oil).

-
High speed spinning is possible.

-
Product life is semi-permanent.

-
Pneumatic system should be equipped.

-
Machining is not easy.

-
Has less stiffness than ball bearing.

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