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In-process measuring system for outer diameter with digital feedback function. In the use of measuring continuous surface on an outer diameter. G91F will receive the final size of already grinded workpiece and adjust its parameters according to the feedback values to achieve a higher precision and a better product consistency. G91F is the measurement and control electronic unit, K69 is the measuring head for outer diameter. HC cylinder is to guide K69 to the working position. Typical application: to grind the outer diameter of shaft parts.