One view of manufacturing quality is that all measured characteristics must be within the specification or tolerance ranges. There is another view that value of the average of a number of measurements should be as close to a specified "Target Value" as possible. I am a strong proponent of the Target Value system for a lot of reasons.
What system do you favor and why? Is there an opportunity for readers of this blog to initiate a dialog on this topic?
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There is a famous example of transmissions being built by two manufacturing operations. Each had the identical transmission design.
ReplyDeleteManufacturer #1 had a "Conformance to Spec" view of manufacturing. That is, any part meeting specification was equally as good to another part as long as they both were acceptable to the specification.
Manufacturer #2 had a "Conformance to Target" manufacturing strategy. In this case, a part was best when it was at the target value (i.e. in the typical case of a 2-sided tolerance, the spec midpoint would be the target.). In this view, parts become progressively less "good" as they move from the target, even though they remain in specification.
As this story is told and retold, it points out that the customer complaints were severe for the "Conformance to Spec." operation, but the supplier using "Conformance to Target" had a very low customer complaint rate.
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