A new approach to the macro-level optimization of tool geometry in mac
hining is proposed. Methods for characterizing the tool material, the
work material and the optimum tool geometry are proposed and a model d
escribing the interactions between them is developed. Empirical eviden
ce drawn from published literature is presented in support of the new
approach. In this approach, the optimum tool geometry is characterized
by a geometric entity number which can be explicitly calculated in te
rms of cutting tool angles. Practical benefits derivable from the appr
oach are discussed along with the issues requiring further research.