ME170

1
ME170 Computer Aided Design
Introduction
available at course website www.ews.uiuc.edu/me1
70
Instructor Dr. Mike L. Philpott Associate
Professor of Mechanical Science and Engineering
2
Course Team

• Course Instructor Coordinator
• Mike Philpott

Graders Allison Kennedy Scott Paarlberg Bryan
James James Condon Eric Wright
Graduate Teaching Assistants (labs) Rick
Romanow Ming Ying
3
Contact Details

• Mike Philpott Instructor for Tu/Th Lectures
  Overall Course Coordination
• Office 3007 MEL
  
• Office hrs 1pm-2pm Monday, 1100-noon Thurs.
  
• Phone Number 244-3184
• Email mphilpot_at_uiuc.edu
• TAs Responsible for lab sections, lab
  assignments, lab grading and final project
  grading
• Office hours and other contact details
  Announced in Lab section
• Graders Assist during labs, mostly grading
• Office hours and other contact details
  Announced in Lab section
• Will also be posted at
• www.ews.uiuc.edu/me170

4
MIE170 Lab Section Location Engineering
WorkStation Lab 1009 MEL (Labs Start Week 2,
i.e. Mon. Aug 31 Sept 4)
Required Course Book Pro/ENGINEER Wildfire 4.0
Basic Design By Steven G. Smith, Published by
CADquest inc.
ProE Software Download (optional) http//webstore.
illinois.edu ProE Wildfire 4.0
5
Course Objectives

• Learn the fundamentals of engineering
  design/drafting
• Learn to describe the geometry and topology of
  engineered components in standard industry
  formats (ANSI/ISO)
• Learn to fully define and specify a component, or
  assembly of components, in a mathematically
  robust geometric fully associative database (3D
  CAD or solid model).
• 2D blueprint form, 3D wireframe and cosmetically
  shaded presentations, meshed topologies for
  engineering analysis, and toolpath generation for
  component manufacture.
• Learn Parametric Technologys ProEngineer
  (Engineering Design Solid Modeling System)

6
Grading Scheme
Lecture Assignments (15) Lab Assignments 1 -
10 (45) Attendance (5)
A Excellent gt 90 B Good lt 90 gt 75 C
Fair lt 75 gt 60 D Poor lt 60 gt 45 F Fail lt
45


Project Prelim Presentation (5) Project Final
Presentation (10)


Design Project Report (20)
7
Lab AssignmentLate Handing in Policy

• After the deadline you should FTP your lab
  assignment to the lateLabs directory
• If you need extension due to illness or planned
  trip, e_mail instructor and request penalty
  waiver. Even if waiver given, ftp to lateLabs
• Penalty is 50 credit after deadline up to 2
  weeks late. ZERO credit after 2 weeks.

8
M/IE170 Design Project

• Form small design teams (2 typ.)
• Design a small product or sub-assembly.
• Create
• Part models for each part
• Assembly model with exploded views
• Assembly models with Bill of Materials (BOM)
• A full set of engineering drawings (including
  dimensional tolerances, geometric tolerance,
  standard limits and fits etc.)
• Develop and give a computer presentation
• Write a Design Project report

9

• Overview of CAD
• Solid Modeling
• Surface Modeling
• Parametric / Featured Based
• B-Rep, CSG, kernels

10

• 3D CAD - Solid Modeling
• Software used for the design of industrial
  products. Prime users are the automotive,
  aerospace and industrial engineering industries.
  Main Players
• ProE (PTC)
• UnigraphicsNX/IDEAS (Siemens)
• CATIA/Solidworks (Dassault)
• AutoCAD /Inventor (AutoDesk)

11
Solid modeling The unambiguous representation of
the solid parts of an object, that is, models of
solid objects suitable for computer processing.
It is also known as volume modeling. Surface
Modeling Surface models used extensively in
automotive and consumer product design as well as
entertainment animation. surfaces are defined,
trimmed and merged, and filled to make solid.
usually defined with datum curves in space and a
variety of powerful surface quilt control
commands.
12
Parametric modeling Attributes of features are
parameterized, giving them labels rather than
only giving them fixed numeric dimensions, and
relationships between parameters in the entire
model are tracked, to make changing numeric
values of parameters easier. Almost always
combined with features, giving parametric feature
based modeling. Examples of parameters are
dimensions used to create model features,
material density, formulas to describe swept
features, imported data (that describe a
reference surface, for example). Related to
parameters, but slightly different are
Constraints. Constraints are relationships
between entities that make up a particular
shape
13
Feature based modeling Complex combinations of
objects and operators are considered together as
a unit which can be modified or duplicated. Order
of operations is kept in a history tree, and
parametric changes can propagate through the tree.
14
Mini-Metro Final Presentation
December. 16. 2002

• University of Illinois Team
• William Bullock, Industrial Design
• Dr. Michael Philpott, Mechanical Engineering
• Do Sun Shin, ID
• Sebastian Schrader, ME
• Tom Philpott, ID, ME
• Product Interaction Research Laboratory (PIRL)
• University of Illinois Urbana-Champaign

15
Image Map
Hard
Hard
High Cost
Low Cost
Soft
16
Idea Development
17
(No Transcript)
18
Absorb

• Utilizes existing tubing capabilities
• Height adjustment with large threaded
  shaft/collar
• Forward seat pivot
• Off the shelf parts used to create a new look

19
Uno

• Minimal number of parts
• Variable spring rate to accommodate different
  users
• New look of integral molding for main structure
• Ball casters with recirculating bearings

20
Joint

• Blow molded backrest
• Cushion inserts into backrest
• Integrated neck rest
• Height adjustment with pin and holes

21
Final Design Selection

Uno Joint Absorb
(Shock)
22
Absorb
23
Uno
24
Joint
25
Joint
26
Uno
Joint
27
Joint Tilt Mechanism
Pivoting in the base
To separated parts made of wax in a 3D ThermoJet
printer
Part created In a Stereo- Lithography machine for
rapid prototyping for casting
TILTING ARM
SUPPORT
28
Ball Casters
Six bearing balls sliding in elliptical housing
29
Ball caster concept (any chair)
30