Anti-backlash screw jack

trapezoidal screw

Anti-backlash screw jacks are used wherever reversible load conditions require precision positioning control. CHARACTERISTICS The unit allows the lash between the drive sleeve and the work screw thread to be accurately controlled by the relative position of the upper and lower drive sleeves. Adjustment of the cover, by loosing set screws, changes the relative distance between the sleeves. This change in distance compensate for any slash. Axial backlash should be minimized but not completely eliminated, the result would be a lock-up of the jack. When top plate touch the jack body, the jack wear is at the limit and Jack shall be revised.