Windows98, Windows NT and Windows 2000 OS
environments. 2. Contents and structure of STEP-NC
STEP-NC stores almost all information generated by
the preceding production departments. The structure and
contents of STEP-NC are shown in Fig. 1. Workpiece
entities have material information and geometric
information of the machined material. The setup entities
have the setting of the milling machine and workpieces.
The WORKPLAN has the order of each machining step
and all processes are accomplished according to this
plan6
. Information of each machining step is written as
workingstep entities. The workingsteps are used to
describe each machining step and to bind and store CAD,
CAM and machining data together. A workingstep is
defined as one step for machining of one feature with one 本文来自辣'文)论'文`网，
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tool. Entities of CAM have machining information, tool
information and tool paths; however, tool paths are
frequently omitted because they are optional entities.
Entities of CNC variables have commands for CNC
machines irrelevant to motions of the machine axes. This
research does not use the original STEP-NC file but uses
the STEP-NC file in XML form.
Fig. 1 Example of STEP-NC, ISO 14649-11 example 1
3. XML file data input
The STEP-NC milling machine of this work differs
from other prototypes in the data input method. This
system does not use the original STEP-NC file like other
machines
7
, but uses the XML file that has the same
contents and data structure.
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