The level average response graphs for surface roughness
in the case of graphite assisted and coolant flood grinding
show remarkable difference as shown in the figure. In the
case of coolant grinding, the response graph agrees with the
various process models [15,30,31]. These models also correlate
surface roughness with the undeformed chip thickness
and dressing conditions, as in the case of force components.
So the surface roughness increases with the increase of
feed, infeed and coarseness of dressing and it decreases
with increase of speed. But in the case of graphite assisted
grinding a clear curvature effects is seen with speed,
infeed and dressing. Interestingly roughness increases with
increase of speed and it decreases with increase of infeed and
coarseness of dressing in the initial ranges. So the available
process models fail to explain the behavior of graphite in
generating the surface. So further investigation in this regard
is required.