An objective of six sigma is to reduce variation and to move outputs permanently inside critical customer requirement. Define- what’s the problem (opportunities, scope), Measure – how’s we are doing (current state, desired), Analyze – what’s wrong (not cause, proposed solutions), Improve – fix (prioritize, refine, implement) , Control – capture and sustain (measure , acknowledge). In this paper, we used DMAIC approach to increase the productivity of the hurco machine which is used for milling operation of copper pieces in the manufacturing firm. After applying the DMAIC approach the remarkable increase of 5% is observed in the overall OEE of hurco machine. Keywords: DMAIC, Six Sigma, OEE and Changeover.