In this study, the Six Sigma define-measure-analyse-improve-control (DMAIC) approach was chosen, to enhance quality improvement by implementation of a measurement system capability in terms of kerf thickness accuracy in a sawmill. In a first step, the major possible defects were defined and the measurement system was tested by means of a gage repeatability and reproducibility study (GR&R). Using the GR&R both measurement devices, i. e. automatic and manual, were analysed. The results yielded an underperformance of the automatic system, which made the manual system, by means of caliper rule, for the first stage, the system of choice. A second GR&R was performed after the automatic system was recalibrated, but still the results were not convincing, leading to manual measurements. The operators were trained and improved methods for the data reporting were implemented. In terms of the analysed thickness accuracy, for each saw blade an optimum cutting speed section could be found. In comparison to the initial situation the saw blade deflection could be reduced by a rate of 23.5 %. The implemented process control, by means of manual measurements, allows a continuous quality control. In conclusion, adoption the DMAIC approach with GR&R procedure turns out to be an effective method in improving the quality involving measurements and allows a direct analysis of the final product if parameters in production are changed.