Machining information can be calculated as follows,
if it is invalid.
z Workingstep separation: this system can separate one
workingstep to 2 or 3 workingsteps if the geometry is
complex or rough machining is prerequisite.
z Feed rate and RPM of spindle: with specific energy
for machining of material, tool information and the
power of machine, this system can calculate the
cutting speed.
This module prepares these values, activates the tool
path generator, and hands the data to the tool path
generator.
4.2 Tool path generator
The system of this research has the tool path
generator for two5D features. In STEP-NC two5D
features are separated into two groups by the tool motion
for cutting, so they differ in tool path generation.
Features of the first group are machined by vertical
cutting that is referred to as drilling type strategy. For
example hole feature belongs to it. Features of the other
group are machined by milling type strategy that is the
machining method by vertical and horizontal cutting
movements. Pocket, planar face, step, slot belong to this
type. The tool path generator of this research has two types of individual tool path generator for milling and
drilling. Each individual features are fitted to the
generalized two5D feature of each machining type, and
then machined.
4.2.1 Two5D feature machined by drilling type
strategy
Hole feature of STEP-NC and its geometric
information are shown in Fig. 3. Every single hole
machining operation except boring performs the same
machining motion. First, the tool moves to the center
point of the hole, then digs through the surface of
workpiece vertically until it reaches a desired cutting
depth. A hole has different information with bottom
condition. Hole of bottom-through condition has no
cutting depth, but has an overcut depth. The cutting depth
of such type is calculated by adding the workpiece
thickness to the overcut depth. A hole diameter matches
the diameter of the machining tool. Thus, the diameter of
a hole feature is generally omitted. Multi-step drilling is
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