Consisting of an encoder or potentiometer and a wire that pays off a drum, a cable extension transducer provides inexpensive measuring over long distances because its wire needs no guidance to follow a straight line-only an attachment at the working end. Also called draw wire sensors, string pots, even yo-yo sensors, the devices can be installed without much fussing over alignments. They are built to withstand extreme environments, such as paper mills, or can be furnished as instrument grade styles that are at home in a lab.
The FDA has just released draft guidelines for using 3D printing in the design, development, and manufacture of regulated medical products. Although the recommendations are non-binding, they do set some much-needed parameters.
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