Retrofitting machine tools: converting conventional machine tools to numerical control
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achieved amplitude ratio average ball-nut lead screws candidates for retrofitting characteristics circuits companies control builders controlled machine tools conventional machine tools Corporation cost of retrofitting cutting tests electronic control electronic hardware engineering costs error detector feed rate feedback devices frequency response guide-ways hydraulic cylinder Hydrote0 Hor0z Hydrote0 Vert0ca0 Hydrote0 Industrial Development Division input frequency installation logic section machine function machine slide maintenance manufacturing mechanisms ment Michigan milling machines modifications North American Aviation numerical control capability numerical control system numerically controlled equipment numerically controlled machine open-loop operation original machine tool phase shift point-to-point position error print-to-part problems product requirements programming punched tape refurbishment resonant frequency retro retrofit alternative retrofit candidate retrofitted equipment retrofitted machine tool Rocketdyne servo system servomechanism shown in Figure slide movement solid-state speed Stanford Research Institute stylus successful retrofit survey Synchronizing Circuits tolerance transfer function type of retrofit Unknown Unknown users of retrofitted velocity