Absolutely, Alex. In my previous position, the MBTF was actually more important than linear accuracy. It was so true that "others" demanded a spare as part of the standard BOM, rather than on the list of suggestions for our customers. (It was useful too, when the mechanical system fail and destoyed the position sensor - which actually was working quite well).
My experience with resolvers was with ABB industrial robots. The first absolute positioning system I saw used 3 resolvers (IRB 90), followed by 2 (IRB 2000) and finally 1 resolver and a revolution counter (IRB 6400). The feature I thought was most useful was it 'failed-safe'. An axis with an encoder has to fail to show movement feed-back when commanded to move to detect a failure. How far does tha axis move before the lack of position change feed-back causes a fault ? With a resolver, a broken wire causes a failure during initialization.
Environmental protection is frequently a deciding factor in industrial environments. Can it take being hosed down with high pressure, caustic solutions such as is found in food processing? Can it resist coolant or oil?
Positional accuracy seems like the key spec when choosing a rotary encoder, but what about MTBF? Does that come into play at all, especially considering that it's a part which gets a heavy and constant workout?
We are using a RVDT to track the opening percentage of large Ball type valves used in Pipelines to monitor closing sequence and speed. Here, resolution was not necessary, but reliability is of utmost importance; the RVDT is rugged and very reliable. Amclaussen.
A slew of announcements about new materials and design concepts for transportation have come out of several trade shows focusing on plastics, aircraft interiors, heavy trucks, and automotive engineering. A few more announcements have come independent of any trade shows, maybe just because it's spring.
Samsung's Galaxy line of smartphones used to fare quite well in the repairability department, but last year's flagship S5 model took a tumble, scoring a meh-inducing 5/10. Will the newly redesigned S6 lead us back into star-studded territory, or will we sink further into the depths of a repairability black hole?
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