Types of screw actuators is very common in mechanical engineering and other types of industry. These actuators are used for lifting, pushing, and other similar tasks. For this reason, there are four main categories of screws and actuators for use in lifting, moving, or operating parts. They can be divided further into four categories which include pole screws, screw jack screws, bent bar, and other such forms. Each category has its own specific use which will be described in the following paragraphs.
One type of screw drive includes a shaft attached to a pole, with the screw embedded in the shaft. This force is exerted by a series of gears onto the steel or iron shaft, depending on the nature of the job. Common materials used in the making of these types of screws include iron, titanium, brass, aluminum, stainless steel, and other metals.
Another type of screw drive includes a slide rod with a threaded end that extends from the base of the actuator, onto which you can apply a wrench or similar force to apply a tightening or loosening force. A sliding stem screw provides the most straightforward, easiest to use form of an actuator. It can be powered either by winding a wire around the coil or else by using a hydraulic press. Many types of such screws are powered by an electrical motor or by a pneumatic pump. Such a model has only one shaft, which is attached to the lifting part through a threaded connection on the top of the actuator.
The third kind of screw drive is a bolt actuator. Like a screw drive, it is driven by a screw that is inserted into a hole. Unlike a screw drive, however, it does not require a lubricant to operate: any existing grease or other fluid can serve as a lubricant, greatly increasing the life of the system.
A fourth variety is called a ball screw. It resembles a ball-and-socket screw, but it does not utilize a socket for insertion into a hole. Instead, it drives into a plastic sleeve that’s designed to allow insertion of a standard ball-and-socket screw. The advantage of this design is that the screw force applied to the spring is independent of the actuation force generated by the screw.
Fifth and last is a screw actuator called a rotary actuator. As its name suggests, it acts in a circular fashion. These types of screw drives are often used on shafts that have a cross-section that includes two cylinders. Because these screwdrivers have a stationary shaft and a rotation element, they generate a very low torque, meaning they are only able to exert a relatively weak pulling force.
Some screw actuators are available with one or more rotary teeth. This variation allows them to be used on a wide range of screw shafts, which increases the potential for efficient performance. They also tend to generate lower torque, which makes them more suited to applications where the amount of force necessary to induce movement is low.
Which of these types of screw drive is right for your application is dependent upon the type of material being acted upon. Screws that are fastened to a shaft are more likely to be effective when their center-load force is very strong. Conversely, materials like nylon can only be fastened using a moderate amount of force. Lastly, a shaft with an interlocking feature is a good choice for applications that require consistent torque production. The design of the screw drive will also depend on the area you intend to work in; for instance, a ring-shaped screw actuator would likely not work where there is a need for a flat surface like a plate or other material.