Using Eq. (8.30) and referring to Fig. 8.18a, estimate the magnitude of the coefficient a.
For this problem, assume (although it is not
strictly correct) that the mean temperature, T,
is equal to the flank surface temperature, as
given in Fig. 8.18a. We can then determine
the values of temperature as a function of the
cutting speed, V , and obtain a curve fit. The
particular answers obtained by the students will
vary, depending on the distance from the tool
tip taken to obtain the estimate. However, as
an example, note that at a value of 0.24 in. from
the tool tip, we have
The resulting curve fit of the form of Eq. (8.30)
on p. 439 gives the value of a as 0.34. Note that
this is within a reasonable range of the value
given on p. 439.