DFMA as Applied to the Swingline 747 Desktop ... - University of Utah

DFMA as Applied to the Swingline ® 747 Desktop Stapler
will be used. Weather, temperature, soil acidity, and a host of other factors may affect
the lifetime of the product, which in turn can also affect the design. As was mentioned,
the optimal design for one aspect might be the least desirable for another.
One of the key material selection paradigms in DFMA is the derived parameter
ranking. This enables the designers to rank each material depending on the desired
property or ratios of related properties. According to the resulting data, proper selection
of material can be better made.
2.2 Material Selection – Stapler
The full material selection data obtained by using DFMA equations is available in
appendix A. Appendix B gives the selection criterion for DFMA. Table 3 gives a limited
overview of the materials selection for each of the 17 primary parts of the 747 stapler. It
is a brief presentation of what material DFMA suggests should be used for each part
based on different criteria. Some parts were not analyzed due to their apparent adequacy,
i.e. no materials change was deemed necessary. The column labeled analysis run
indicates the criteria desired. The three subsequent columns give the material best suited
for those criteria under certain conditions. For example, the release clip analysis was run
to obtain the strongest beam. The material yielding the maximum performance is alloy
steel. The minimum weight is achieved with aluminum. The minimum cost material is
cast iron. The variance of materials offered by the analysis is indicative of the subjective
nature of DFMA; sometimes a decision must be made when the data present conflicting
results. The last column of Table 3 indicates what is believed to be the actual material of
which the part is made.
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