Linear actuators are smooth and precise

that provides smooth, precise linear motion for low to medium duty applications with loads up to 10kN. The loads can be moved at speeds up to 5,500mm/min as standard with higher speeds available too. Power Jacks' EMA linear actuators have a drive unit that is based on a precision spiroid gear set, a right angled/offset drive consisting of a gear and pinion. The pinion is positioned in a different plane to the gear, which enables each shaft to be supported by bearings on both ends. The pinion has a parallel screw form and has fewer teeth than the gear, which has a face type similar to a hypoid-offset spiral bevel. This gives a greater number of continuously meshing teeth than for a similar size worm gear. The high contact ratio gives greater strength, smoothness and quiet action from a compact design and this gives high quality rotary motion from the drive unit, which is then transferred into linear motion by the actuation unit. The actuator is based on a lead screw assembly that converts rotary motion into linear movement. As the screw rotates, the nut extends and retracts the ram, which is attached to the load. Two types of lead screw are used: a precision cut trapezoidal screw and nut for low duty applications; and a high quality ball screw and nut for low to medium duty applications. DP To access this and other related articles go to www.eurekamagazine.co.uk Click "Reference Library" and key in 'actuators' to the search box Power Jacks Enter XXX Pointers * The EMA linear actuator provides smooth, precise linear movement for low to medium duty applications * The drive unit is based on a right angled, precision Spiroid gear set comprising a gear set and pinion * The actuation unit is based on a lead screw assembly that converts rotary motion into linear movement