Metal window boxes are manufactured in two process steps: stamping and assembly. Each window box is made up of component set with three pieces: a base (one part A)and two sides (two part Bs). The parts are fabricated by a single stamping machine that requires a setup time of 50 minutes whenever switching between the two parts types. Once the machine is setup, the processing time for all parts (either type A or type B) is 12 seconds. Completed components sets move from stamping machine to assembly, where they are assembled manually to to form the finished product. One base (part A) and two sides (two part Bs, as well as a number of small purchased components, are required for