
92 Fundamentals of Machining Processes
4.1.3 Impact of Tool Wear
Figure 4.6 shows the different impacts of tool wear, which include the
following:
1. The cutting forces increase by the rubbing action occurring as a
result of the ank wear. In some instances, crater wear reduces the
cutting forces by effectively increasing the rake angle.
2. Flank wear affects the position of the cutting edge with respect to
the workpiece, which, in turn, alters the dimensional accuracy of
machined parts.
3. Surface roughness deteriorates as a result of the tool wear, parti-
cularly if the tool wear occurs by chipping of the tool material.
4. Tool tempera