Researchers at the University of Duisburg-Essen in Germany
are investigating whether the load-life calculations for ball-screw actuators used routinely by engineers are applicable in machine designs that involve repetitive moves, short strokes, and quick thrust build-up over a fraction of revolution. "The equations were developed several decades ago when there were less sophisticated techniques available to determine the behavior of rolling elements and their impact on wear," says George Jaffe, Executive Vice President of Steinmeyer, Inc., a maker of ball screw actuators and motion systems. "Now we have the tools to develop more refined models that take into account things like the impact side loads, ball spacers, and various lubricants have on ball screw life." To support this effort, Steinmeyer is providing sample products and technical assistance to the research team. "Engineers can still use the existing equations, they just need to recognize that they're making a 'best estimate,'" says Jaffe.
The fun factor continues to draw developers to Linux. This open-source system continues to succeed in the market and in the hearts and minds of developers. Design News will delve into this territory with next week's Continuing Education Class titled, “Introduction to Linux Device Drivers.”
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.