Choosing Materials:
When choosing materials, allow the use of different forms of the material such as bar stock and plate. There can be
significant differences in the cost and lead time of acquiring different forms. The Table below shows approximate $/lb
and machinability ratings for common metals. Consider the strength vs. machinability rating as well when choosing
materials. Choosing an annealed but heat treatable alloy of steel for example and then not specifying any heat treat
will just drive cost with little benefit in material performance. As you see below, some aluminum can have even better
performance than some grades of steel with significantly better machinability.