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To Obtain maximum productivity, longest tool life and high-quality surface finish on a lathe, it is necessary that the machining be done at a constant surface-cutting speed. This is especially true with carbide cutting tools. Deviations from optimum cutting speeds must be minimized. This paper discusses an analog study of a system employing a dc motor combined with a multistage field regulator in a closed-loop system to provide constant surface-cutting speed on an automatic copy lathe. The study was conducted in order to determine how performance could be improved.