Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2012.1456.1464RajeshS. MarimuthuK. 1220121214On-line drill wear state monitoring and effective tool replacement at proper time is an important technique to be developed to realize a fully automated manufacturing system. In this study, the standard data acquisition software LabVIEW (Laboratory Virtual Instrumentation Engineering Workbench), in the application of virtual instrumentation is used to predict the drill wear states. Drilling operations have been performed in mild steel workpiece by High-Speed Steel (HSS) drill bits over a wide range of varying cutting conditions. The effective drill wear models are established based on the relationship between cutting current signals and the varying cutting parameters (cutting speed, feed and drill diameter). The cutting tool status is continuously monitored and the degree of drill wear is displayed as a percentage of the maximum permissible wear. LabVIEW facilitates defective tool replacement at the proper time based on drill wear states in the automated manufacturing environment. The effectiveness and reliability of the method are verified by experimental results.]]>Subramanian, K. and N.H. Cook,199799295301Jantunen, E.,2002429971010Aliustaoglu, C., H.M. Ertunc and H. Ocak,200923539546Ertunc, H.M. and K.A. Loparo,20014113471362Ertunc, H.M. and C. Oysu,200414533548Abu-Mahfouz, I.,200343707720Xiaoli, L.,199939157164Lin, S.C. and C.J. Ting,199636465475Fernandes, M. and C. Cook,2006467075Gomez, M.P., A.M. Hey, J.E. Ruzzante and C.E.D. Attellis,20103819825Panda, S.S., D. Chakraborty and S.K. Pal,20088858871Li, X. and S.K. Tso,1999231172178Gupta, S. and J. John,2005Bishop, R.,2010