Robots aren’t all humanoid and SCARA; some take the form of linear-motion arrangements. In fact, we’ve covered how Cartesian arrangements in particular offer better energy efficiency and price points than more stereotypical robotic arrangements. You’ll get copious amount of information on such linear designs and technologies at the 2019 Robotics Summit (on commercial-robotics design, development, […]
What are planar errors and how do they affect the accuracy of a linear motion system?
In an ideal world, a linear motion system would exhibit perfectly flat, straight motion and reach the intended position with zero error every time. But even the highest precision linear guides and drives (screws, rack and pinions, belts, linear motors) have some errors due to machining tolerances, handling, mounting, and even the manner in which […]
Motion Trends: Linear bearings help some CNC machine builders trim cost
Axes on CNC machines to allow spindle movements are mission critical — requiring high accuracy. But doors and other linear axes have different design requirements — with forgiveness and ruggedness being priority instead. Now, linear bearings from Rollon Corp. help some CNC machine builders trim cost and improve reliability by satisfying these unique design requirements. […]
Linear motion trends in slides: Robotics and mobile designs lead the charge
Demand for simple-to-install and pre-integrated linear-slide systems continues unabated … especially in applications only recently automated. Here’s the perspective of Matt Mowry, North American market manager for drylin products at igus: “We’ve supplied fully assembled and customized linear-slide tables … complete with motors and accessories. We’ve also supplied custom-extruded linear profiles and bearing liners to […]
Mechanical properties of materials: Stress and strain
Every component in a linear motion system experiences some form of loading due to applied forces or motion. The component’s reactions to these loads are described by its mechanical properties. For components subjected to tension or compression — such as load-carrying balls and rollers, shafts mounted vertically, or fastening and joining hardware — the mechanical […]
One-piece ETX linear bearing/pillow blocks suitable for use in radioactive environments
LM76 now offers one piece ETX Linear Bearing/Pillow Blocks that will not degrade in a radioactive environment. Machined from a solid block of self-lubricating ETX, linear bearing blocks have high strength, excellent wear resistance, low coefficient of friction, and excellent dimensional stability at higher temperatures. Custom designed for use in a nuclear power plant these […]
Follow these four tips when using L10 life to size linear bearings
The well-known bearing life equation, often referred to as L10 life, is a fundamental element in the sizing and selection of recirculating linear bearings. Through statistical analysis and real-world testing, the L10 life equation can predict, with 90 percent reliability, the life that a recirculating bearing can be expected to achieve. But even this universally […]
Rotary ball splines ensure sub-millimeter accuracy
The NB rotary ball spline has a cylindrical nut that rolls on the ball spline shaft. Rotary ball splines can be used for both rotational motion and linear motion, providing sub-millimeter accuracy every time. Popular applications include SCARA robots, the vertical shaft of assembly equipment, automatic tool changers, and loaders. A ball spline’s forte is […]
Profiled rail accuracy: When accuracy class doesn’t tell the whole story
You’ve chosen a profiled rail and bearing for a high-precision application — machining, cutting, or metrology, for example. The bearing (aka carriage, or runner block) has good load capacity and rigidity, so it should provide long life and low deflection. But when you integrate the assembly into your application, you notice that the system doesn’t […]
Heavy-duty but lightweight slide is a solution for transportation and industrial uses
Accuride International announced the U.S. launch of its AL4160 Super Heavy-Duty Aluminum Slide – a strong but light solution that combines a full aluminum body with stainless steel components for diverse transportation and industrial applications. “We designed the AL4160 to address a market need for a slide that supports heavy loads and performs in harsh environments but […]
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