Knowledge Base

Kelston specialise in the design of screw jack systems. As part of our service we can advise on component selection, equipment layout and control functionality.
  • Electromechanical vs. Hydraulics

    Electromechanical vs. Hydraulics

    Mechanical screw jacks and linear actuators are increasingly becoming the preferred choice of actuation over the equivalent hydraulic or pneumatic systems.
  • Screw Jack Calculation - Power

    Screw Jack Calculation - Power

    Kelston has created an online System Builder for customers to quickly and easily determine an appropriate screw jack system.
  • Screw Jack Working Principle

    Screw Jack Working Principle

    Screw Jacks are found wherever there is a need to lift, position and hold load. A Screw Jack (also known as a Jack Screw, a Worm Screw Jack, a Machine Screw Jack or a Lead Screw Jack) is a devise used to convert rotational motion into linear motion.
  • Worm and Wheel

    Worm and Wheel

    Worm Drives are used when the axis of rotation of a shaft must change direction. Being low-cost, potentially self-locking and providing high gear reductions, Worm Drives provide an effective means of decreasing speed whilst increasing torque.
  • Bevel Gear Sets

    Bevel Gear Sets

    Bevel gears are used when the axis of rotation of a shaft must change direction. Providing a highly efficient and durable means of gear reduction, Bevel Gear sets have many uses.
  • Screw Threads & Mechanical Advantage

    Screw Threads & Mechanical Advantage

    A screw is a mechanical system that converts rotational motion in to linear motion. In other worlds it converts rotational force (torque ) in to a linear force. Here the resultant axial force due to an input torque is calculated from first principles.
  • Screw Thread Terminology

    Screw Thread Terminology

    A screw thread is a helical groove formed on an internal or external diametrical surface and is described by various terms including pitch, root, crest, flank and major diameter. These terms are described here.

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