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FEATURE LINEAR MOTION


Linear transmission engineering gets straight to the point


The need for linear motion is increasingly common, especially in areas such as automated assembly packaging and robotics. This has led to a plethora of different linear technologies, and finding a way through this can be daunting. Matt Jones, a linear motion specialist at Drive Lines Technologies, offers a quick guide to the basics


shaped ball bearings, designed to support a shaft


over a section of its length. They can come with an end- flange or grooves for circlip


ngineers have always needed to create and control linear movement, and over the years the technologies to support this need have developed. As is typical, early solutions were relatively simple, but they have grown in capability and sophistication, and today there is a wide choice of linear motion components. When specifying a solution for a given application, some people may feel spoiled for choice and end up being unable to identify the most appropriate. Drives Lines has a wide ranging portfolio of linear products, plus the expertise to help engineers find the best solution for their requirements. There are some basic rules to understand, and an assessment of the project and calculations (relating to loads and speeds, for example) will form the basis of the selection procedure. Firstly, it is necessary to differentiate between driving and guiding. An actuator is a powered component that creates linear motion, whereas a guide is unpowered and used to keep other components on the straight and narrow. Often drive and guide are used together and it is important not to forget the importance of the guide. The guide can come into its own if there are (expected or unexpected) side loads or other loads that could upset the system.


E


GUIDES Ball bushings and linear shafting are generally used where a cost effective solution is required in commercial and industrial applications. They can be used in horizontal, vertical and inclined orientations and generally the shaft has a round cross section. Ball bushings are in effect sleeve-


18 JUNE 2017 | DESIGN SOLUTIONS


mounting, in a thin walled variant and mounted within a pillow block housing. Similar to ball bushings, plain linear


bearings and linear slides are also offered by Drive Lines. A range of liners and coatings provides solutions for difficult and harsh environments, where traditional ball bushings cannot be used. Shock loads, high speeds, and demanding environments are often best addressed with a plain bearing. The accompanying linear shafts from Drive Lines are precision ground and hardened. They are usually made from steel or stainless steel, although soft stainless steel and hard-coated aluminium shafts are also available for food and wash down applications. Flanged shaft end supports, clamping blocks, zimmer clamps and other accessories are also available. A form of linear guide, popular for


mechanical handling and heavy load applications, is the combined bearing and rail. These provide a cost effective guide solution to lift systems, platforms, monorails and cantilever loads. The system combines a radial bearing, to take out high moment loads, and a smaller axial roller to eliminate side movement. Typically, the rail is U-sectioned and is combined with a flange plate, to which the bearings and rollers are attached. When it comes


to automation, tooling and machine tool linear guidance, linear ball guides provide high precision, high capacity linear motion and can be extremely cost effective. Based on a design of infinitely recirculating ball bearings, they provide equal load capacity in all directions, so produce smooth movement and accurate positioning. Ball bearings are compact, have a low centre of gravity and are available in different precision and pre-load grades, in order to meet most types of precision applications.


When it comes to automation, tooling and


machine tool linear guidance, linear ball guides provide high precision, high capacity and can be extremely cost effective..."


DRIVES Ballscrews enable cost effective high speed and high precision actuation for automation and


industrial applications. Ballscrews offer high


rigidity, minimal backlash, fast speed and positional


accuracy. They can be supplied preloaded and are easy to install.


Drive Lines Technologies also offers high-performance linear actuators, which combine guide and ballscrew or leadscrew options, and can be supplied with a drive motor to provide a fit-and- forget linear drive solution. As well as a comprehensive range of linear components, Drive Lines represents USAutomation, an OEM supplier of cost effective motion control solutions. Its range of linear positioning stages and stepper motors provide cost effective,


precision solutions for high-tech and


miniature applications.


Drive Lines Technologies www.drivelines.co.uk


/ DESIGNSOLUTIONS


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