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CHAPTER 2
INTRODUCTION TO CAD AND SOLID
MODELING
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In 1822, Charles Babbage an English
Mathematics Professor, invented the
Difference Machine. Babbage was troubled by
the many errors found in calculations which
led to the loss of ships.
The Difference Engine was powered by
steam. This machine could solve complicated
calculations by moving various levers and
gears. After working with the Difference
Engine for 10 years, Babbage invented
another device called the Analytical Engine.
He later applied to the British government for
funding to do more research on computers.
Charles Babbage is noted as the father of
computers.
Introduction
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2-1 Computer Systems and Components
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CAD Systems Classes
Networked Computers: Conventional and LAN
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2.3 Computer-Aided Drafting
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FEM/CFD Analyses
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Observe deformation, max von Mises stress, and convergence of strain energy
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2.12 Solid Modeling in CAD System
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Boolean Operations
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Assembly
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Rapid Prototyping
The rapid prototyping is a new technology that is based on layering
technology. Any 3D objects can be constructed by a sequence of layers
stacked up. There are several different types of machines to build the
prototypes these days.
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The following site shows the list of rapid prototyping systems.
http://www.cc.utah.edu/~asn8200/rapid.html#COM
StereoLithography is a technology that uses a 3D CAD design to produce
solid epoxy prototype models. The StereoLithography apparatus (SLA) is
connectedto a computer. Specialized software directs a laser beam over a
specialized epoxy resin in an exact pattern driven by the 3D CAD
model. The laser beam hardens a thin layer of the resin. Over time, the
laser "builds" a solid plastic prototype layer by layer. The result is a highly
accurate solid model of the 3D CAD design.
Fused Deposition Modeling™:
Stratasys developed and patented Fused Deposition Modeling (FDM™)
that enables Stratasys rapid prototyping systems to build accurate,
complex parts using a variety of high-performance engineering materials
like ABS, polycarbonate and polyphenylsulfone. Powered by Insight™
software, STL CAD files for a selected part are automatically sliced and
oriented to fit within a given system's build envelope. Insight generates
precise extrusion paths for the specified build materials along with any
additional support structures.
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CAD Systems are made up of computer hardware and
specialized software.
The use of CAD has revolutionized engineering
graphics.
Usually you should select the software that will
perform the functions you require and then select
hardware appropriate to run that software effectively.
Summary