SUPPRESSION OF CUTTING FORCES USING COMBINED INVERSE MODEL BASED DISTURBANCE OBSERVER AND DISTURBANCE FORCE OBSERVER - Maharof, M.; Jamaludin, Z.; Minhat, M.; Abdullah, L.; Anang, N. A.; Chiew, T. H.; Jamaludin, J.; Tjahjowidodo, T. (Journal of Advanced Manufacturing Technology (JAMT))