SOME BENEFITS GUARANTEED BY THE USE OF RECIRCULATING BALL SCREWS
High efficiency and durability
wear resistance
axial rigidity
reduced friction between parts in contact
The life of recirculating ball screw depends on multiple factors : design, quality, maintenance and from the dynamic axial load capacity. Factors that most affect dynamic axial load capacity are profile accuracy , the quality of the material and surface safety.
We can identify three types of ball screws :
internal recirculation of the spheres : spheres are preloaded and their recirculation is returning them back after each round, at the previous. The number of the spheres is lower and thus are minor wear and friction.
external recirculation of spheres : spheres, after several rotations, are bring again at the beginning of the circle through an outer pipe to the nut, which consequently is more bulky. The coupling parts must have a cavity for the passage of return tubes. This model is advantageous in the case of long pitch screws and it is adaptable, unlike the previous model, the addition of additives to increase the resistance at the corrosion and the
recirculation at " end cap " : this type of ball screws uses the same mechanism as the external recirculating ball screws but with the difference that the recirculation tube is created inside the body of the lead nut as a through hole.