Metric Anti-backlash Screw Jacks

Metric Anti-backlash Actuators 5 to 500 kN

5-to-500-kN load capacity. Metric Anti-backlash actuators reduce vertical backlash resulting in smooth, precise operation and minimal wear. Backlash occurs when the motor driving an actuator reverses its load direction. When the actuator is under load, the lifting screws threads are supported by the worm gears threads. The anti-backlash nut, being pinned by to the worm gear and being adjusted downwards by the shell cap, forces the bottom thread surfaces against the upper thread surfaces of the lifting screw. Thus backlash between the lifting screw and worm gear threads is reduced to a minimum.

• Anti-backlash nuts reduce worm gear wear. They also act as additional load safety devices when the worm gear has become worn.
• The anti-backlash nut, being pinned to the worm gear and adjusted downwards by the shell cap, forces the bottom thread surfaces against the upper thread surfaces of the lifting screw. Thus backlash between the lifting screw and worm gear threads is reduced to a minimum.
• The Duff Norton Anti-backlash design features a separate anti-backlash nut and reduces actuator backlash to less than 1 thousandths.
• Metric Anti-backlash actuators reduce vertical backlash resulting in smooth, precise operation and minimal wear.