PowerAc TMtrapezoidal screws from Nook Industries have centralizing threads that maintain alignment of the thread axis. The screws are manufactured in accordance with ISO standards. "We are finding more customers designing with global sales in mind, so they are asking for metrics," says Rick Christyson, chief engineer at Nook. The company offers eight sizes from 10 to 65 mm. The screws are accurate to within±0.1 mm per 300-mm lead. "The screw's threads are made with a 30ºangle. We make the nuts to match, so there is no wedging or binding. Keeping the tolerances tight also lowers the friction and extends the life of the products," says Christyson. Plastic and bronze nuts are matched with screw capacities. Customers choose trapezoidal screws made from stainless steel for food and medical applications or high-carbon 4140 alloy steel for machine tool, packaging, and other industrial applications. PowerAc screws are compatible with the company's EZZE-MOUNT™bearing supports for 16-, 20-, 26-, 40-, 55-, and 65-mm universal face/foot-mount bearing supports and 16-, 20-, 26-, 40-, and 55-mm flange-mount bearing supports.
One way to keep a Formula One racing team moving at breakneck speed in the pit and at the test facility is to bring CAD drawings of the racing vehicle’s parts down to the test facility and even out to the track.
Most of us would just as soon step on a cockroach rather than study it, but that’s just what researchers at UC Berkeley did in the pursuit of building small, nimble robots suitable for disaster-recovery and search-and-rescue missions.
Design engineers need to prepare for a future in which their electronic products will use not just one or two, but possibly many user interfaces that involve touch, vision, gestures, and even eye movements.
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