According to http://linearactuator.org, linear motion is closely associated with a line along a certain specific axis. As such, if there is need for a solution along an axis, the various approaches have to take into account the linearity of the motion. Relative to aspects of effectiveness and efficiency, selecting the right screw is of paramount importance. Selecting the right lead screw is important, however it is also important to note that there are also other types of screws, given the diverse problems that require solutions.
There are quite a number of aspects that one has to consider when selecting the right screw for the job. One of them is the thrust, which simply refers to the amount push that the screw has to be given to make sure that it pushes the load through a given distance. The speed with which the motion has to occur is crucial to the application and hence the choice of the screw. Having a load move through a certain distance without errors means that the screw has to offer accuracy. This is further connected to the element of repeatability, such that, the screw has to move the load through the same distance with the same level of accuracy every other time. The amount of movement that has to take place between the screw and the nut is important to make sure that the efficiency is not compromised. One other aspect that has to be considered is the resolution. This is an element that is largely associated with control of the linear tool that is moved by the motor and a controller. It is crucial that one choses the right lead screw, given that a small diameter screw will require a less powerful motor to achieve the level of resolution with a large diameter screw.