Biomedical Engineering Reference
In-Depth Information
chisel edge and flank surfaces cause damping in the system. However, due to
the fact that these investigations have been conducted in an unconventional
way, the results are not completely trustworthy since there is rarely a situation
where one would have to rotate the workpiece instead of the drill. By using the
stationary tool, the effect of the spindle and bearings was neglected, neglecting
the conventional problems in drilling.
Figure 2. Photograph and measured profile of a three-lobed hole [12].
The state of the art in turning, milling, drilling and grinding has been
presented by reference [13], covering present mathematical models and chatter
suppression methods. The first part of the paper deals with the dynamics of the
orthogonal metal cutting and chatter stability lobes, defining the linear
dependency of the cutting forces on the width of cut and feed per revolution
(or static chip thickness):
F
K ah
0
F
K ah
0
where: a - width of cut, h
0
- feed per revolution or static chip thickness , Kt , Kr
- tangential and radial cutting coefficients.
The dynamic chip thickness and transfer function of the closed loop
system have been defined as:
