Abstract
A real-time error compensation system was developed to improve the geometric-thermal volumetric accuracy of a T-10 machining center by using sensing, metrology, modeling, and computer control techniques. Including thermal errors, 32 error components are formulated as a four-dimensional error field in the time-space domain. Fifteen thermal sensors are used to characterize the temperature field of the machine. A compensation controller based on the IBM/PC has been linked with an Acramatic-950 CNC controller to compensate for machine errors in real time. The maximum linear displacement error in four body diagonals was reduced from 140 μm to 34.5 μm with this compensation system, and the spindle thermal drift in space was reduced from 147.3 μm to 16.8 μm.
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