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Computer Aided Manufacturing
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Chapter 2
Neutral Data file
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3Prepared by Dr. mohamed Ahmed
Awad
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Prepared by Dr. Mohamed Ahmed awad
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5Winter term 00/01
Neutral File Formats
• DXF - Drawing Exchange Format
• IGES - Initial Graphics Exchange Specification
• CADL- CADKEY Advanced Design Language
• STL - Sterolithography.
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IDA-STEP
An end-user
application
for viewing
and editing
of
STEP data
Lothar Klein, LKSoft
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Definition
IDA-STEP stands for:Integrating Distributed Applications on the Basis of STEP Data Models.
IDA-STEP
• is completely based on JavaTM technology
• runs on top of the STEP toolkit JSDAITM
• is a major result of the IDA-STEP project, partly funded by the European Comission
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IDA-STEPViewer
IDA-STEPViewer
IDA-STEPCenter
IDA-STEPCenter
Architecture
OracleTM / MySQLTM
STEP Database
IDA-STEP DB Bridge
IDA-STEPCenter
STEP-File
IDA-STEPViewer
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Feature OverviewPDM viewing and editing• Organization, Person• Product Identification• Classification, - system• Versions, Design View• Properties• Approval, Effectivity• Contract, Security, Certification• Managed Document• Digital File• Assembly Tree• Project, Activity,
Work Request
Geometry
• 3D-Visualization
• 2D-Drawings & Linking
Process Plan andProcess Operation
Data Exchange and Integration
• Import & Export,Workspace concept
• Interactive Merging, Copy & Paste
• STEP Database
• Automatic Merging
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IGES
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UG, Ideas, Pro/E - DCI
Floating License on A Network PC
PC-DMIS and CAD system on XP PC with correct DCI enabled on the Portlock
CAD File on Network PC
Or a standalone CAD license (dongle).
IGES
IGES
IGES
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What is an IGES file?
IGES (IGS) stands for Initial Graphics Exchange Specification, an ANSI graphics file format for three-dimensional wire frame models.
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IGES Sections
• The file is divided into 5 Sections, indicated by a character (S, G, D, P, or T) in column 72. The characteristics and geometric information for an entity is split between two sections; one in a two record, fixed-length format (the Directory Entry, or DE Section), the other in a multiple record, comma delimited format (the Parameter Data, or PD Section). Here is a more human-readable representation of the file.
• When displayed, the user should see two yellow points (hard to see on a white background, but most CAD systems use a black background), one located at the origin of model space [0,0,0], two red circular arcs, and two green lines.
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Geometric entities
• Circular Arc (IGES entity #100) • Composite Curve (IGES entity #102) • Conic Arc (IGES entity #104) • Copious Data (IGES Entity #106, forms 1, 2 & 3) • Line (IGES entity #110) • Point (IGES entity #116) • Rational B-Spline Curve (IGES entity #126) • Rational B-Spline Surface (IGES entity #128) • Boundary (IGES entity #141) • Bounded Surface (IGES entity #143) • Curve on a Parametric Surface (IGES entity #142)
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20Prepared by Dr. mohamed Ahmed
Awad
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21Prepared by Dr. mohamed Ahmed
Awad
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22Prepared by Dr. mohamed Ahmed
Awad
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23Prepared by Dr. mohamed Ahmed
Awad
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• What is CAM? Nominate then describe briefly the different applications of CAM?
•
• Discuss the capabilities of current CAD/CAM systems?
•
• Explain the methods of data transfer between dissimilar CAD systems; IGES and PDES?
• Explain the meaning of the different acronym?
• Differentiate among Wire frame, Surface and solid modeling
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• (c) Explain the B-rep and CSG methodologies of solid modeling? Then explain their advantages and disadvantages?
•
• (d) Show how can you decompose a product model consists of a block having a blind step and a through slot into their lower primitives using both B-rep and CSG?
Prepared by Dr. mohamed Ahmed Awad