Modelling and compensation of dominant thermally induced geometric errors using rotary axes' power consumption. Issue 1 (2018) - Bitar-Nehme, Elie
Abstract: Thermally induced volumetric errors due to rotary axes' activity are measured on a five-axis machine tool using a non-contact R-test device with a four-ball uncalibrated artefact and an Invar reference length. The gathered volumetric data allow to estimate intra- and inter-axis machine errors as well as the table expansion via the estimated balls position. Dominant thermal effects are modelled as functions of the measured rotary axes drive power consumption by the superposition of single-input single-output first order transfer functions. The efficiency of the model is validated with different motion sequences and by the compensated machining of a test piece.