FAQ

More than 60 years of experience in the manufacture and application of SFERAX ball bearings testifies to our claim that linear ball bearings in general, and SFERAX in particular, have contributed directly to the improved performance and longer life of all types of high technology machines, with reduced energy consumption.
Below are some guidelines for the installation and calculation of the service life of SFERAX bearings. Any mechanical ball bearing construction requires compliance with certain rules. Failure to observe these basic precautions will in one way or another impair faultless operation. Nevertheless, we would remind users that ball bearings are fragile elements requiring due care. The following rules should always apply:

– A high degree of cleanliness
– Avoidance of shock loads
– Correct alignment of the ball bearing and shaft
– Adequate lubrication
– Correct loading of the ball bearing and shaft.
– Appropriate temperature
– Careful adjustment (bearing and shaft)

The shaft deflection should always be calculated, as this may dictate that a larger diameter bearing is required (see frequently asked questions). It is easily understandable that a shaft bent under the load is not supported by all the balls of the bearing. Normally a deflection larger than 0,01 mm with respect to the length of the supporting balls is unacceptable, unless the ball bearing is strongly over dimensioned for the actual load.

Note: the fact that a bearing is preloaded is a factor in reducing its service life. 

Sferax S.A. is not liable if the above-mentioned conditions are not fully met.