How Does A Translating Screw Jack Work?

How Does A Translating Screw Jack Work?

In Brief: The lead screw translates through the body of the screw jack when the lead screw is prevented from rotating with the worm gear. This is typically done by fixing the end of the lead screw to the structure that needs to be moved linearly.

In Detail: When a screw jack unit is operated, the rotation of the worm shaft causes the worm gear to rotate. For translating screw jacks the worm gear is threaded to accommodate the lead screw thread. As the worm gear turns, the friction forces on the screw thread act to turn the screw also. The greater the load on the screw jack unit, the greater the tendency of the screw to turn. It is obvious that if the screw turns with the nut (worm gear), it will not raise the load. In those cases where a single unit is used, and where the load cannot be restrained from turning, it is necessary to screw jack with an anti-rotation mechanism (keyed screw jack). Lead screw key torque (refer to E-Series Screw Jacks brochure (P77)) must be checked as excessively heavy unguided loads could break the Anti-rotation mechanism (key).


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About Power Jacks

Power Jacks is a British design and manufacturing company, based in Scotland, specialising in electro-mechanical actuation, lifting and positioning equipment. The business has 6 complimentary areas of expertise including screw jacks, bevel gearboxes, electric linear actuators, lead screws, planetary roller screws and jacking systems. Our products are engineered to the highest standards and deployed in a multitude of applications in over 80 countries worldwide.

Power Jacks
Kingshill Commercial Park
Prospect Road, Westhill
Aberdeenshire, AB32 6FP
Scotland (UK)

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