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Grain being transported from the truck into a grain silo was moved over a scale to be weighed. Each scale had to have four matched springs. Since the scale was very sensitive, it was necessary to match these springs each time they were installed even though they fell within the manufacturing tolerance of plus or minus 10%. The customer was spending too much time sorting the wire wound springs to find sets of four that had equal spring rates.
This was a retrofit application, therefore the envelope (O.D./Length) had to fit within the same space as the current wire wound spring. There were eight separate spring rates which were to be matched. This was accomplished by changing the I.D. and altering the number of coils and thickness of coils. The question always arises, "How can the additional cost for the "machined" spring be justified?" The response is:
Elimination of excessive sorting time. Closer tolerances held. Dependability of spring
rates. 
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We
manufacture single piece 
