Pc ¼ apaefzZKcvc
pD60 (2)
Fig. 5 also shows the evolution of the sound pressure level for a
range of feed per tooth (0.05–0.2 mm/rev), for a range of axial
depth of cut (0.5–2 mm), for a range of radial depth of cut (20–
95 mm) and finally for a range of stiffness ratio (0.08–4).
It was observed that when increasing the feed per tooth,
the sound pressure level increased from 88 to 95 dBA. This may be
due to the increase of the cutting force applied to the mechanical
system (tool + spindle + machine-structure + fixturing + part). The cutting force can be estimated by the following equation [15]