CNC Spindle Thermal Error Digital Twin Using Simulink and Gaussian Process

How well can a digital twin of a CNC spindle head compensate its thermal growth? In a SIMULATION study (a documented 5-node thermal model of a spindle head, not a real machine tool) the uncompensated Z drift of 14.5 um RMSE on 10 unseen 6-h test runs falls to 0.91 um with multiple linear regression on four temperatures, 0.80 um with a Gaussian process on temperatures and filtered speed history (no clear difference from MLR: -0.10 um [-0.57, 0.53]) and 0.45 um with a Kalman-filter twin that re-estimates its heat input online; model-mismatch tests show where each method breaks. No number is a claim of accuracy on a real machine.

Category: Production Engineering

Production Engineering Project PR07 from ProTechSC Academy, with graphical abstract, video demonstration and project guidance.