me110- introduction to cad craig r. ronald hylan 303
TRANSCRIPT
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ME110- Introduction to CAD
Craig R. RonaldHylan 303
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Course Format
Pro/ENGINEER » Industry recognized leader
in mechanical design software.
Focus on solid modeling, detailing and assemblies.
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Design Examples
Barbie Beetle
X-38 Crew Return Vehicle
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Design Examples
LeMans Race Car
Paintball Mask
Dentist Chair
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Design Examples
John Deere Combine
Automatic Bus Transmission
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About the Instructor MS Mechanical Engineering U of R
1990 Taught ME110 since 1987 Used Pro/ENGINEER since 1997
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Importance of Course Only a 2 credit course but... Teaches the language of
engineering Skill that is most likely to help job
search
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Web Site http://www.me.rochester.edu/courses/ME110 The web site will be kept up to date Check frequently! You are responsible
for knowing the information on the site.
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Blackboard Log on at: http://my.rochester.edu/ Assignments Email lists Grades
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Course Outline cont’d Memory Stick
– you will need to have a USB memory stick by next lecture
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Grading 6 Homework worth 8 points each,
Lowest grade is dropped! 1 midterm test worth 30 points, no
curving. Second exam worth 30 points on
last day of class.
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Six View Orthographic Projection
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Three views are usually sufficient
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Choice of views– least hidden
lines– clarity– only necessary
views
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Precedence of Lines
Visible Hidden Center
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Meaning of lines– intersection of 2 surfaces– edge view of a surface– contour of a curved surface
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Section Views
Use section views to eliminate hidden lines.
All visible lines behind plane shown.
Hidden lines are rarely shown.
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Types of CAD systems Wireframe- modeling the curves of the
part Surface modeling- Model the surfaces of
the part, but without knowledge of material.
Solid modeling- full solid representation Parametric Modeling- dimension driven
solid modeling.
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Solid Modeling What is a solid model?
– A three dimensional representation of geometry that includes the shape definition of the geometry as well as a definition of inside and outside.
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Why use a solid modeler? Intelligent modeling- modeler can
understand concept like through, through until, etc.
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Accurate Detailing– Hidden lines– Section views– Auxiliary views
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Manufacturing- Tool paths may be made directly
from the model.
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Interference checking
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Finite Element Analysis Ability to do Deflection and stress
analysis on complex parts/assemblies.
Complex problems are discritized into simple shapes.
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Rapid Prototyping Stereo Lithography
– Light setting polymer is built up layer by layer with a laser.
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3D Printing Inkjet printer glues together layers
of Plastic or Stainless steel powder. Sintering binds the powder.
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Demo
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Types of Solid Modeling B-REP– Boundary representation
– The solid is defined by the surfaces bounding the volume as well as inside and outside definition. (outward unit normal)
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Types of Solid Modeling CSG- Constructive Solid
Geometry– Primitive solid shapes joined together with
Boolean operators define the solid. The model is stored with a tree structure.
– Boolean operators are three-dimensional set operators (union, difference, and intersection).
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Set Theory
Union Difference
Intersection
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CSG- Constructive Solid Geometry