Arguably, the lowly shaft coupling is the "Achilles heel" of motion system design. Used to fasten a motor shaft to a drive screw, couplings add compliance to actuator systems. If misaligned, couplings reduce bearing life, and decrease efficiency. A hollow-shaft stepper motor driving a ballscrew through its center eliminates couplings, providing a more compact, reliable actuator, while improving efficiency over leadscrew designs.
"While more expensive, ballscrews provide a wider range of design options, longer life, and higher efficiency than leadscrews," says EADmotors Project Engineer Rob Cinq-Mars. The motor consists of a magnet assembly on a hollow shaft. The hollow front shaft extension is tapped internally to mate with common threaded ball nuts. When the ballscrew is kept from rotating, it actuates linearly through the hollow shaft of the stepping motor. To match all types of unipolar and bipolar drives, a full spectrum of windings is available.
Cinq-Mars reminds engineers to keep in mind that the ball nut must be less than 1.5 inch in diameter, the screw and load must be fixed to prevent rotation, and the design must maintain enough clearance for the ballscrew behind the motor. "Engineers benefit because it's so easy to change the screw out," explains Cinq-Mars. A wide assortment of mounting hubs lets engineers change the screw's pitch and alter the speed, exerted force, or positioning resolution without changing the package size.
By experimenting with the photovoltaic reaction in solar cells, researchers at MIT have made a breakthrough in energy efficiency that significantly pushes the boundaries of current commercial cells on the market.
In a world that's going green, industrial operations have a problem: Their processes involve materials that are potentially toxic, flammable, corrosive, or reactive. If improperly managed, this can precipitate dangerous health and environmental consequences.
A quick look into the merger of two powerhouse 3D printing OEMs and the new leader in rapid prototyping solutions, Stratasys. The industrial revolution is now led by 3D printing and engineers are given the opportunity to fully maximize their design capabilities, reduce their time-to-market and functionally test prototypes cheaper, faster and easier. Bruce Bradshaw, Director of Marketing in North America, will explore the large product offering and variety of materials that will help CAD designers articulate their product design with actual, physical prototypes. This broadcast will dive deep into technical information including application specific stories from real world customers and their experiences with 3D printing. 3D Printing is