25 Ton Heavy Duty Ball Screw Jack for Steel Mill Applications

The fundamental advantage is high mechanical efficiency. Ball screw jacks utilize rolling elements (ball bearings) rather than sliding friction, achieving an efficiency of up to 80% to 90% compared to the 20% to 30% efficiency of Acme jacks. This translates to lower input torque requirements, reduced power consumption, smaller motor sizes, and drastically lower heat generation.

Yes. Because the rolling ball mechanism generates minimal frictional heat, ball screw jacks are capable of handling high-frequency cycles and near-continuous (up to 100%) duty ratings, provided the thermal limits of the gear housing are not exceeded. Acme jacks, by contrast, are typically capped at a 25% hourly duty cycle.

No. Due to the high efficiency and low rolling friction of the ball screw mechanism, ball screw jacks are not self-locking and will backdrive (slip downward) under the influence of gravity or axial loads. Therefore, an external holding mechanism, such as a motor brake or a fail-safe electromagnetic brake, is strictly mandatory to maintain position when power is lost.

Translating Type: The ball screw passes through the gear housing and moves linearly. The ball nut is integrated inside the worm gear. This is ideal for applications where the load can be guided externally and the screw has space to extend past the housing. Rotating Type: The ball screw is fixed to the internal gear and rotates in place, causing an external ball nut to travel along the length of the screw. This is preferred when space beneath the jack housing is restricted or for long-stroke use.

Positioning accuracy depends on the lead error grade of the ball screw (typically precision rolled or ground). Standard industrial ball screw jacks exhibit minimal axial backlash (often under 0.05 mm to 0.08 mm). For high-precision applications requiring sub-millimeter repeatability, preloaded ball nuts can be used to achieve near-zero backlash.