There are several ways to monitor loads in a press or punch inserting operation. Load washers, while somewhat insensitive to torque or other extraneous loads or moments, can have lower accuracy. Pancake load cells are more accurate but also much larger. A donut or thru-hole load cell offers reduced size with improved accuracy for these measurements.
Using metal foil strain gauge technology, FUTEK’s LTH300 miniature donut/thru-hole load cells address measurements from 50 to 1000 lb. Available in 17-4 stainless steel construction, the low profile (0.028-inch) units’ inner diameters range from 1/8 to 3/8-inch (3.40 to 9.80 mm) and the outside diameter is 0.98 inch (24.9 mm). With a rated output of 2 mV/V, the safe overload is 150 percent, zero balance is ±1 percent, and nonlinearity, hysteresis and non repeatability are ±0.5 percent of the rated output. Units have a nominal deflection of 0.002-inch, weigh only 2 oz (57 gm) and operate over a temperature range of -60 to 200F (-50 to 93C) with a compensated temperature range of 60 to 160F (15 to 72C).
In addition to a standard 10-ft long Teflon shielded cable with mechanical strain relief, available options include in-line signal conditioned, amplified or digital output, as well as an IEEE 1451.4 Transducer Electronic Data Sheets (TEDS) version. Other applications for this design include dual tank level control, tank dispensing and bag-filling machinery.
Science fiction author Isaac Asimov may have the best rules for effective brainstorming and creativity. His never-before-published essay, "On Creativity," recently made it to the Web pages of MIT Technology Review.
Much has been made over the potentially dangerous flammability of lithium-ion batteries after major companies like Boeing, Sony, and Tesla have grappled with well-publicized battery fires. Researchers at Stanford University may have come up with a solution to this problem with a smart sensor for lithium-ion batteries that provides a warning if the battery is about to overheat or catch fire.
In this new Design News feature, "How it Works," we’re starting off by examining the inner workings of the electronic cigarette. While e-cigarettes seemed like a gimmick just two or three years ago, they’re catching fire -- so to speak. Sales topped $1 billion last year and are set to hit $10 billion by 2017. Cigarette companies are fighting back by buying up e-cigarette manufacturers.
Advertised as the "Most Powerful Tablet Under $100," the Kindle Fire HD 6 was too tempting for the team at iFixit to pass up. Join us to find out if inexpensive means cheap, irreparable, or just down right economical. It's teardown time!
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