The high accuracy is commonly in conflict with the large-stroke in the feed system of Ultra-precision lathe

so one of the key technologies in presently Ultra-precision-maching is to develope a kind of feed system with better dynamic and stationary characteristic

large-stroke and high accuracy.This paper contributs a new kind of principle and its practical methol. It comprehensively utilizes computer technology

dynamic detection

signal processing

control theory

sensor and micro-displacement technologies etc. to divide the accurate feed into two parts; master feed and compensation feed. The two parts are harmoniously continuously controlled respectively. This method effectively solve the contradiction between the large-stroke and high accuracy. The technique can increase the positioning accuracy of common feed system by ten times and enlarge the stroke of the micro-feed system.