Jiqin Feng

Dynamic Error Correction Method for Time Grating CNC Rotary Table

Predictive measurement method was proposed for the circular position of time grating CNC rotary table. To reduce the dynamic prediction error and achieve high precision position feedback, this paper analyzes the characteristics of the dynamic prediction error caused by multi-factors of space and time quantity, and then proposes a discrete standard quantity interpolation method for real-time error correction. A dynamic prediction error correction model is established for the circular position of time grating rotary table, and the measured values of time grating are adopted as the standard of predicted values. The last prediction error is corrected in real-time with the current measured values of time grating after current position predicting is conducted. An experimental positioning system is designed to confirm the validity of the proposed methods. The dynamic error of time grating CNC rotary table is ±2, which proves precise prediction is achieved.