please send me ppt of selection of manufacturing for screw jack ..
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A worm screw having a worm gear with a worm gear which is operatively connected to a lifting screw is provided with an anti-recoil device. The anti-recoil device comprises a sleeve positioned axially along the lifting screw from the worm, the sleeve is secured to the worm gear by a protrusion of the worm gear and a mating recess disposed in the sleeve. The axial length of the sleeve is preferably 8% less than the pitch of the lifting screw.