Experienced gear molders caution design engineers to avoid common pitfalls with plastic gears. One old problem, says ABA/PGT, is misaligned mating parallel-axis (spur and helical) gear tooth surfaces. The solution is the modification of gear flanks by making them full thickness at mid-face-width and tapering them to each edge, as shown in the drawing below. This modification, extending over the full height of the gear tooth, is referred to as crowning. Other useful advice comes from UFE of Stillwater, MN. Operating temperature must be factored into designs using dissimilar materials. If a gearcase is made of metal and the gears are plastic, the distance between the gears will change because of the differing coefficients of linear thermal expansion.
Last year at Hannover Fair, lots of people were talking about Industry 4.0. This is a concept that seems to have a different name in every region. I’ve been referring to it as the Industrial Internet of Things (IIoT), not to be confused with the plain old Internet of Things (IoT). Others refer to it as the Connected Industry, the smart factory concept, M2M, data extraction, and so on.
Some of the biggest self-assembled building blocks and structures made from engineered DNA have been developed by researchers at Harvard's Wyss Institute. The largest, a hexagonal prism, is one-tenth the size of an average bacterium.
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.