The function of the positional control system of system of machine tool numerical control is the coordinate niche that dominates part of machine tool motion accurately, execute the athletic order that comes by CNC device hair well and truly. 1. The positional control system of the system of numerical control of principle of work of positional control system of system of machine tool numerical control is system of a double closed circuit. Core is speed annulus, the control that becomes independent as is unit, it waits for a part to comprise by speed adjuster, electric current adjuster and power drive amplifier. The outer shroud with speed unit control is positional annulus. Positional control system is by the position control module, speed controls the part such as feedback of unit, position and check side to form. Its job process is: The position that comes by CNC is defeated by person instruction and positional feedback device to detect the actual displacement quantity of the feed coordinate that go out undertakes comparative, the deviation signal that must come quite, through the operation of positional control equipment, output the result converter of D / A, turn voltage into signal, become speed annulus to give signal, control electric machinery rotates to the way that removes deviation, it is zero hour till deviation, electric machinery suspends campaign, arrive appoint the position. Such, the real position of feed coordinate can follow the instruction changes, form a position to control a system. 2. The characteristic that system of machine tool numerical control controls a system to the position (1) positional control system has taller stability, it is the premise that numerical control system works normally, it by the construction that controls a system. (2) the trends of positional control system is answered should fast, make the system has good trends to follow function, eliminate load to disturb as soon as possible the influence of pair of system speed. (3) positional control system has taller control precision. Numerical control machine tool is commonly used the treatment at accurate and mechanical spare parts, the trends that controls a system to the position so and static control precision have higher demand. The fixed position precision of machine tool of ordinary numerical control asks to be 1um, the fixed position precision of system of rigid numerical control asks 0. 1um is taller even. (4) positional control system has higher reliability. CNC Milling
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