
123Cutting Cylindrical Surfaces
conditions and minimum force uctuations; therefore, a better surface
quality is ensured.
Cutting tools are usually provided with a rounded corner. Figure 5.9 shows
the surface prole produced by such a tool under ideal conditions, where the
peak-to-valley surface roughness R
t
and the arithmetic average roughness R
a
can theoretically be estimated, respectively, from
R
S
t
mm=
2
R
S
a
mm=
2
The surface roughness increases at higher feed rates and decreases while
using a larger nose radius (Figure 5.10). The same gure also indicates the
decrease of surface roughness at high cutting speeds. Increasing the depth ...