These are the most compact type of nut. The
balls change their traveling direction with a
deflector, pass over the circumference of the
screw shaft, and return to their original positions
to complete an infi nite motion.
The preload adjustment with Simple Nut Ball
Screw is performed according to the ball diameter.
This eliminates the inconsistency in the contact angle,
which is the most important factor of the Ball Screw
performance. It also ensures the high rigidity, the
smooth motion and the high wobbling accuracy.
The Ball Screw in motion under an external load receives repeated stress on its raceways and balls.
When the stress reaches the limit, the raceways break from fatigue and their surfaces fl akes like
scales. This phenomenon is called fl aking. The service life of the Ball Screw is the total number of
revolutions until the fi rst fl aking occurs on any of the raceways or the balls as a result of rolling fatigue of the material.
The service life of the Ball Screw varies from unit to unit even if they are manufactured in the same
process and used in the same operating conditions. For this reason, when determining the service life
of a Ball Screw unit, the nominal life as defi ned below is used as a guideline.
The nominal life is the total number of revolutions that 90% of identical Ball Screw units in a group
achieve without developing fl aking (scale-like pieces of a metal surface) after they independently
operate in the same conditions.
