8 .19 colony from the time it is cast as an ingot until the time it is assembled into the colony structure. It also monitors all inspections of every piece. In this way if it is discovered that there is a bad 'batch' of material, each piece which is made from that batch can be inspected and,if necessary, replaced. The second job of the automatic control unit is to give instruction to the machine tools about what they should do with a certain work piece they receive. Since the control unit knows exactly where every piece will fit into the final structure, it can give commands at each step along the way as to how that piece must be machined or milled. In addition the IPU handles other data management and monitoring tasks such as power plant operation, environmental controls, etc. Although the IPU requires several humans to operate it, its mass and power requirement are not considered significant. VIII.4.5.2: Manipulators and Conveyors: The mass of all the manipulators and conveyors required to move the work pieces through the machines is included in the masses of the rolling mills. VIII.4.5.3: Refuse Disposal and Recycling: All crop and trimmings are returned to the refining area to be melted into ingot. Any slag and nonrecyclable waste is bagged in bags .2m x .4m x .6m to be used as shielding. VIII.4.6: Conclusion: Using the above equipment, it should be possible, working 19.2 hours/day, 365 days per year for 5 years, to produce the following required stock parts: 600,000 1,200,000 3,090 3,353,000 3,353,000 Plates Minor Stiffeners Major Stiffener Assemblies Nuts Fasteners It is obvious that the rolling mills, which constitute the vast majority of the mass of the machines required, are operating
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