A Dynamic, working, or lifting load is the force that will be applied to the linear actuator while it is in motion. Static load, also called the holding load, is the force that will be applied to the linear actuator when it is not in motion.

A An Electric Linear Actuator can be split into its two main sections: Drive Unit a) Gearbox and motor. Actuation Unit a) Ram section of actuator. The drive unit typically comprises of a gearbox and motor. Although some actuators are direct motor driven with no gearbox. The gearbox is either a single or double stage gear set as standard (helical, bevel, worm, or helical-worm type gearing). The actuation unit is based around a lead screw assembly, which converts the rotary motion into linear movement. As the lead screw rotates, the nut extends and retracts the ram, which is attached to the load. The lead screw assembly is packaged inside a ram arrangement with guides and seals to provide a sturdy enclosure. Three types of lead screws are used in electric linear actuators: Machine Screw, Ball Screw & Roller Screw.

A A linear actuator is a device that moves between two points in a linear motion. Linear actuators are available based on a variety of technologies including: Mechanical, Electro-Mechanical, Direct Electric (Linear Motors), Hydraulic & Pneumatic. All of jacton linear actuators are either mechanical or electro-mechanical. Electro-Mechanical Linear actuators are also known as Electric Linear Actuators due to the primary drive being an electric motor. Electric Linear Actuators convert the rotary motion of the electric motor to linear motion by means of two main components a gearbox (rotary motion) and a lead screw (linear motion).

A In general, semi-continuous operation can be permitted where load is light as compared to screw jack rated capacity. Units so used should be lubricated frequently and protected against dust and dirt. Special designs of screw jacks fitted with ball screws may also suit high duty applications, consult us for details.

A The duty cycle, the length of the screw, the magnitude of the load, and the efficiency of the screw jack unit all have a direct influence on the amount of heat generated within the screw jack. Since most of the power input is used to overcome friction, a large amount of heat is generated in the worm gear set in both ball screw and machine screw jacks, and in the lifting screw of machine screw jacks. Long lifts can cause serious overheating.

A Inverted screw jacks with bellows boots must incorporate an allowance in the length of the lifting screw for both the closed height of the boot and structure thickness. We suggest that a circular plate similar to the lifting screw top plate be welded or bolted to the bottom of the structure supporting the screw jack, thereby making it possible to use a standard bellows boot.

A A screw jack can be built to pivot a load by two methods: Double Clevis Screw Jack: The screw jack can be furnished with a clevis at both ends (commonly referred to as a double clevis screw jack). The bottom clevis is welded to the bottom end of an extra strong cover pipe, which is fitted to the base of the screw jack. This bottom pipe still performs its primary function of encasing the lifting screw in its retracted portion. Clevis - Trunnion Mounting: The screw jack is fitted with the standard clevis end on the lifting screw and a trunnion mount adapter is bolted to the screw jacks base plate. The design of the structure in which these type of screw jacks is to be used must be constructed so that screw jack can pivot at both ends. Use only direct compression or tension loads, thereby eliminating side load conditions

A Screw Jacks can be supplied with alternative materials and/or paint specifications for high corrosive areas. These options include stainless steel, chrome plating, Electro-nickel plating, epoxy paint, etc.