PTC- Design

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Parametric 3-D Solid Modeling
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• 3-dimensional design software such as
• AutoCAD 3-D
• AutoDesk Inventor
• PTC Pro/D or Pro Engineering
• Rhino
• Solid Works
• Allows engineers to visualize proto-types before
  construction.
• Allows engineers to perform simulated analysis
  mechanical analysis called Free Element Analysis.

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Inspect the model before it is produced.
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Detail important information like center of
gravity and mass before it is constructed.
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Check for tolerances and ergonometrics before any
production money is spent.
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Complete mechanical analysis in the design
process saves money in the long run.
Provide presentation graphics of a proposed idea
to future investors and engineering managers.
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Provides designers working drawings that comply
with all ISO and ANSI standards. These can be
used oin the manufacture of the project.
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Also converts designs to .iges or .stl for rapid
prototyping and CNC operations.
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• Parametric Design - a system that constructs
  relations among the geometry of different
  elements. When one element is changed, the
  geometry of the rest of the elements are changed
  as well.
• Parametric design changed the way products are
  designed and prototyped design gt prototype gt
  manufacture all on computer

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• Parametric Design Model
• The nature of design problems Many design
  problem can be informally described as a problem
  in which a set of needs and desires is given and
  where the solution is a description of some
  structure that satisfies these needs and desires
  (Wielinga, Akkermans, and Schreiber, 1995).
• Analysis process - designer transforms the needs
  and desires into a more formal and complete set
  of requirements and constraints.
• synthesis process - a structure is developed
  the design that consists of a number of
  building blocks or elements with specified
  properties such as dimensions, material etc.
  and relations between them.

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• Conceptual Engineering resources that allow you
  to develop ideas at the earliest stages of the
  design process, without getting bogged down in
  specifications systems that allow you to quickly
  explore design possibilities and rapidly capture
  ideas...

and allow you to go back and change almost any
parameter of the design.
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• Reverse Engineering producing 3-D images of
  manufactured parts when a blueprint is not
  available in order to remanufacture the part.
• Coordinate measuring machine (CMM) generates a
  wire frame model.

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Output for CNC mills routers
PTC- Design Technology in Schools Program
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RapidPro
Stacked paper slices
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Wire Frame Modeling

• Stores positions of lines (in 2D or 3D)
• Helpful for drafting (easy multiple views and
  easy editing)
• Ambiguous surfaces limit the automation
  possibilities (e.g. no volume calculation,
  no CNC tool path generation)

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Surface Modeling

• Stores equations of surfaces
• Most 3D graphics libraries
• use surface modeling
• Good for visualizing complex
• surfaces and automated NC
• path generation of complex
• surfaces
• Material volume information
• is ambiguous or hard to
• determine (therefore cant
• calculate volume)

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Solid Modeling
Various mathematical representations exist that
each allow point-set classification Is a given
point inside or outside the solid region?
Solid models can be used for volume
calculations Automatic FEA mesh generation
Collision determination in robotics or CNC path
generation

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Solid Modeling Functions

• Different ways that a user can create
• solid shapes
• Primitive creation
• Boolean operations
• Sweep operations
• Surface operations
• Engineering Feature-Based modeling
• Parametric modeling

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Solid Modeling Functions

• Primitives are simple solid
• shapes with simple
• mathematical surfaces
• Can be controlled by a small
• number of parameters and
• positioned using a
• transformation matrix

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Solid Modeling Functions

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Solid Modeling Functions
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Solid Modeling Functions
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References

• Michigan Tech University www.me.mtu.edu/bettig/ME
  EM4403/lecture_05_11.pdf.
• The College of New Jersey Engineering and
  Technology Department.