Six Sigma and Beyond: Design for Six Sigma, Volume VI

FMEAs are not islands unto themselves . They have continuity, and the information must be flowing throughout the design and process FMEAs as well as to the control plan. A typical linkage is shown in Figure 6.20.

Figure 6.20: FMEA linkages.

In addition to the control plan, the FMEA is also linked with robustness. To appreciate these linkages in FMEA, we must recall that design for six sigma (DFSS) must be a robust process. In fact, to see the linkages of this robustness we may begin with a P diagram (see Volume V) and identify its components . It turns out that the robustness in the FMEA usage is to make sure that the part, subsystem, or system is going to perform its intended function, in spite of problems in both manufacturing and environment. Of particular interest are the error states, control factors, and noise factors. Error states may help in identifying the failures, noise factors may help us in identifying causes, and control factors may help us in identifying the recommendations. The signal and response become the functions or the starting point of the FMEA.

The linkages then help generate the inputs and outputs of the FMEA. Typical inputs are:

System (concept) inputs

Design inputs

Process inputs

Machinery inputs

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