414 ◾ New JIT, New Management Technology Principle
and mechanical characteristics of the work piece. e physical and mechanical
characteristics of a work piece are its tensile strength, elongation, hardness, ther-
mal conductivity, density, Young’s modulus, shear elasticity modulus, and yield
strength, and the relative inuence of these characteristics is claried in accordance
with the rough cutting conditions, as shown in Table 10.11.
Multiple regression analysis was conducted in order to determine the relation-
ship between the optimum cutting speed and the physical and mechanical factors,
as shown in Table 10.12. Values were selected for the variables using the stepwise
method, and the partial regression coecients resulting from the ana