RACO Ball Screws - Technology

Ball screws are mechanism for changing rotary into linear motion and vice versa. A ball screw assembly consists of the actual screw, the nut assembly with crossover for the return of the balls and the rolling balls. The balls roll in helical tracks in the screw and nut and form the only connection between them.

The force transmitted is spread over a number of balls, so that the contact stress is relatively low. The rolling friction between the ball screw and nut results in an extremely low coefficient of friction.

The advantages over screws with sliding friction are overwhelming. Precision ball screws have an efficiency of nearly 98% compared with 30% for conventional screws, with a corresponding reduction in the power of the drive required. Even where the power consumption does not represent a crucial consideration, the larger dimensions of a motor cannot always be accommodated.

We use only high-class materials with certificate. Our ball screws and nuts are produced from high strengh steel suitable for rolling bearing applications. Spindles and nuts for the RACO ball screws are ground in air-conditioned work shop facilities. We spare no cost or efforts, since the accuracy we guarantee can only be achieved by precision grinding. The geometrically true form of our ball nuts and the spindle profiles are crucial for the considerably longer service life of our ball screws.

Beyond this, our inductive hardening technique with its considerable penetration depth creates the prerequisite for each spindle to be re-ground, so that it will be reliably for a long life. This means you benefit with lower costs and shorter downtimes in the event of a breakdown.

Another feature favor of RACO ball screws: the special geometry of the profile, the option to freely choose the diameter, and the number of ball screws, depending on the required stiffness. RACO monitors the entire production process carefully, so that the requirements concerning the profile geometry can be met at any time. Moreover, the dimensional accuracy of all RACO ball screws and the quality of the material used are constantly checked and the results properly documented. In matters of quality we do not make any compromises.

The core of a RACO ball screw is the nut with its single lead ball return that has been developed by us. This design has been protected by a universal patent and ensures that the balls are returned within the ball screw nut at the shortest possible route. This gives you the benefit of a higher rated load with the smallest possible nut dimensions, meaning higher efficiency and a longer service life. RACO ball screws with a single or double nut (nut and counter nut) can be preset free from backlash, so that the correct and recurrent positioning can be ensured even if the load or direction change.