Ball screws and nut drives

• Gothic thread profile for precisely defined ball track
• Can be combined with a wide variety of nuts from a comprehensive range
• Material: inductive hardened steel
• Screw end machining to customer request

The rolled ball screws are rolled with a lead precision of 50 and 23 µm/300mm. In the thread rolling method, the thread profile is produced by cold rolling. This process strengthens and smoothes the surface. The natural grain-flow of the material is not interrupted. In the next step, the surface of the rolled-thread bars is inductively hardened. The hardening depth, depending on the dimensions, is approximately 1.5 mm. The hardening process leaves the surface with a coating of oxide that must be removed by polishing with rubberized polishing discs. Before the screw is stored, the required straightness is ensured in the straightening press. Drives consisting of ball screws in conjunction with corresponding ball nuts exhibit characteristics that have the following advantages over the use of trapezoidal screw drives:

• lower friction
• higher precision
• higher stiffness
• lower axial backlash
• higher reliability
• smoother operation
• longer life
• higher efficient

Ball nuts can be considered as the heart of the ball screw drive. The quality of the nut is decisive in determining the running properties of the complete screw drive assembly. The ball tracks, grooves and faces of the hardened nut blanks are ground in a single setting, thereby guaranteeing outstanding quality.

• With mounting holes in the case of flanged nuts (KGF) or feather-key grooves for cylindrical nuts (KGM)
• Can be combined to form zero-backlash pre-loaded nut units • Material steel 1.7131 (ESP 65) or 1.3505 (100 Cr 6)
• With different ball return systems that are optimally adapted to the screw diameter and screw pitch
• With profiled wiper rings to reduce loss of lubricant and remove dirt
• Various preload options available