Specifying a Linear Actuator : 3 Key Factors
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By Japh Humphries , UK Sales & Commercial Manager , Matara UK Ltd .
Linear motion systems are business critical across an extensive range of industries , from food processing plants , to semiconductor manufacturers and packaging producers to name but a few ; in fact , virtually anywhere that requires loads to be cost-effectively moved in a straight line , safely , securely and precisely . These systems have improved automation whilst simultaneously lowering production costs , making them invaluable .
Linear actuators are at the heart of a linear motion system , combining linear guides and power-transmission components in a single unit . Whilst machine builders can opt to design and produce these elements in-house , the majority opt for off the shelf , ‘ readymade ’ linear actuators as it reduces overall machine design and fabrication costs and , as they feature applicationtested and optimised construction , are highly reliable , accurate and provide repeatability ; all of which are core to production machine and automation systems .
Whilst it ’ s important to consider all components of a linear motion system separately and as a whole , choosing the right linear actuator – belt driven , ball screw driven or electric rod type actuator - is fundamental . There are a number of factors that should be taken into consideration , but three stand heads and shoulders above the rest and will ‘ make or break ’ a system .
Key Factor 1 : Speed The speed of the process at hand will impact the actuator ’ s longevity and efficiency .
A ball screw linear actuator will usually perform at around 0.35 to 1.5m / s at stroke lengths under one metre , although higher speeds and longer lengths can be achieved by adding supports to the assembly . However , this will only take you so far as a ball screw actuator may be susceptible to ‘ screw whip ’ at high speeds , where the screw