ABSTRACT
The modified similarity index method is an extension of Deng’s similarity measure concept. This method is a customized form of TOPSIS, which employs the concept of ideal solution for comparing two alternatives in such a way that the most preferred alternative should have the highest degree of similarity to the positive-ideal solution and lowest similarity to the negative-ideal solution. Since the last two centuries, cutting fluids have been extensively utilized in metal cutting industries. At the beginning, simple oils were used with brushes to lubricate and cool down the machine tool, and seldom, lard, animal fat or whale oil was added to improve their lubricating ability. Viscosity of a cutting fluid is also a vital property with respect to its performance and maintenance. Fluids with lower viscosity let micro-chip and dirt to settle out of the suspension.
