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Preloading Systems
+ Differential Roller Screws
+ Ballscrews
+ Internal Recirculation
+ High Speed Line
FAQ

Steinmeyer uses four different systems for preloading to meet all requirements. Basically, preload serves to eliminate backlash and to increase stiffness. Since the preload also affects the friction torque and represents at the same time a load that has to be accounted for service life aspects, it needs to be controlled accurately.

Especially for miniature ballscrews, Steinmeyer has developed a spring loaded double nut to Spring Loaded Double Nut

meet the most demanding requirements of low torque along with high accuracy in position.
Single nuts are available either with backlash or preloaded by ball oversize. As preloaded single nuts always use a four- point contact Singe Nut with four Point Contact
between balls and ball race, the efficiency is reduced slightly compared to nuts with two-point contact. However, this design offers a good cost/performance ratio and provides economic solutions. The Steinmeyer ball return system, optimized for this purpose, does not need any spacer balls to improve smoothness. Hence, our preloaded single nut shows similar load capacities to double nut configurations.
For improved efficiency and stiffness the two-point contact offers optimum solutions. The lead offset needed to enable two- Pitch-Shift Nut

point contact can be achieved by shifting the grinding wheel a certain amount in axial direction in the middle of the nut's internal thread, dividing the nut into two parts where the balls contact on different sides of the balltrack. Both parts of the nut can be equipped with three or more full ballcircles according to the desired load capacity.
The patented Steinmeyer double nut configuration with UNILOCK preloading system Double Nut with UNILOCK Preloading System
represents the latest development in double nuts (DBP Patent No. P3700693.2). It uses two nuts directly preloaded against each other and locked by means of an integral bonding system, avoiding the need of adjusting the distance between both nuts using shims. UNILOCK allows for reduced envelope double nuts with increased stiffness of the nut body and improved precision due to absence of extra parts. The factory set preload is maintained securely, along with a perfect alignment of the nuts. The UNILOCK system has proven its reliability in thousands of applications.