8. 16 of the mill, one horizontal, one vertical, are two high and reversible and have a roll diameter of 400 mm. They are based on two stands of a 350 light section mil (8.6) and have the following operating characteristics: Power Mass Output Maximum Output VIII.4.4: Light Machine Tools Each Stand 700 kW 350 T . 4 T/hr 5 T/ hr Total 1400 kW 700 T . 4 T/hr 5 T/hr VIII.4.4.1: General Design and Function: A light machine tool as defined here is a nachine tool which uses the motion of a sharp tool bit relative to the work piece to shape or form it. Machine tools such as milling machines, lathes, drills and saws fall into this category. In our manufacturing process these machines take the "raw" stock produced by the milling machines and work it into the finished stock parts required for fabrication. As Figure 8.3 shows, after the final rolljng mill in each branch, there is at least one light machine tool. A great number of common machine tools were investigated to determine if there were relations similar to those for rolling mills which would relate size, mass and power requirements and, therefore, vastly simplify a preliminary shop layout of this kind. It was found that as with rolling mills, there was a very definite relation between the power requirement and mass of a machine tool and a slightly less definite but still predictable "mean density" for the tool (see Appendix VIII.A). It was found that the power to mass ratio is given by (Specific power required) = 3 watts/kg for machine tools at least up to 6 tons. This is slightly higher than the value of 2 watts/kg found for rolling mills. The mean density was found to be: (Mean density) = 500 kg/m 3
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