Abstract: The accuracy of compensation mostly depends on the precise mathematical description of error variation and the real-time ability of compensation. A synthetic error compensation deice with a hardware of a one-chip computer MCS-96 is mounted in an extra slot of the CNC unit. The device sends compensation data to CNC system through the bus of CNC. It works fast and reliable with lower cost. It is a effective device for high-precision machine tools. This device has function of data acquisition, data exchange, data handing and compensation errors in real time. Simulation test and machining practice show that 60% of machining error can be compensated.

Key words: 实时处理, 综合误差