The various phenomena generated in the machining process are generally recognized for the quality control purposes on the basis of the engineering measurements. However, the skilled machinist perceives the premonitory symptom of the unusual grinding phenomenon by his excellent sense of hearing. The present paper, therefore, was an attempt to devise new monitoring methods which utilize positively the acute sense of the human instead of the customary methods. Our study has led to one very significant conclusion : There is a very strong possibility of the diagnosis of the redress life, because the sensuous value perceived by the human can be rank-ordered and discriminated by means of the technique of pattern classification using fuzzy algorithm.
