PERSONAL INFO TEXTBOOKSorg.coloradomesa.edu/~skessler/kessler_msc1/ENGR_125_files/ENG… · 1 ENGR...

1

ENGR 125 COMPUTER-AIDED DESIGN AND FABRICATION

SPRING 2012

Mountain Bike Rear Shock Matt Busker

Fall 2010

Instructor

Scott Kessler, P.E., Ph.D., ASNT Level III email: [email protected]

www.coloradomesa.edu/~skessler

CAD Assistant Tom Martens

email: [email protected]

WHY ARE YOU HERE? Required Course CAD modeling is a means to an end Engineering graphics is a very useful skill

Communication

CAD/Fab Course Introduction 2

PERSONAL INFO Consulting Engineer for > 25 years Forensic Engineering (Failure Analysis) Finite Element Analysis Engineering Design Mechanical Testing Nondestructive Testing


http://www.kestek.com

TEXTBOOKS - Required text, tutorials and assignments: Howard, W.E. & Musto, J.C., Solid Modeling using SolidWorks 2011, McGraw-Hill, 2011. - Ebook for reading assignments and selected homework: Engineering Graphics, Selected chapters from Bertoline & Wiebe, Fundamentals of Graphics Communication, 5th Ed., McGraw-Hill, 2007.

•  Available online (see web site for instructions)


2

COURSEWORK Reading Assignments Tutorials are your opportunity to learn by doing Assignments will be posted on the course web site Tutorial/Assignments to be posted on k: drive, account for 50% of grade


Assignments will be given due dates. Late submissions will be given partial credit of up to 50% one class period after due date

at the instructors discretion.

QUIZZES Quizzes are given at the instructors discretion to test knowledge of engineering graphics concepts, especially GD&T 10% of your grade (all 10% will be awarded if quizzes are not given)


LECTURES

Lecture slides posted on course web site: www.coloradomesa.edu/~skessler

Print out and bring to class if desired Provide big-picture concepts

• Design process, manufacturing processes, geometric dimensioning and tolerancing (GD&T), design for manufacturability, etc.

Quiz hints SolidWorks examples and tips

CAD/Fab Course Introduction 7 FINAL PROJECT Create CAD model of an assembly (40% of grade)

•  Use of the 3D modeling concepts •  Must be an assembly of at least three components •  Documentation

•  Part drawings •  Assembly drawing •  Animation/Exploded View

•  3 to 5 minute presentation required (i.e., don’t present, don’t pass the course)


3

LEARNING OBJECTIVES At the completion of this course students should: 1. Know elements of sketching and orthographic projection theory

•  Generate hand-drawn multi-view technical sketches •  Create a multi-view sketch given an isometric pictorial and vice versa

2. Be able to construct 3-D solid models on a modern CAD system

•  Create 3-D solid models of complex objects given a multi-view representation

•  Create solid models of individual parts •  Create reference geometry features (planes, axes) •  Create solid features using sweeping and lofting operations •  Measure properties of 3-D CAD models •  Create assemblies of CAD parts with appropriate mating relationships


LEARNING OBJECTIVES (CONT) 3. Be able to create multi-view, auxiliary and section drawings from 3-D solid models

•  Know the principal planes of projection and the principal views

•  Be able to distinguish between first-angle and third-angle projection

•  Be able to create hidden lines, center lines, etc. based on graphics conventions

•  Create multi-view drawings from 3-D solid models on a CAD system

•  Be able to represent typical features: e.g. holes, threads, chamfers, and fillets

•  Create multi-view drawings given isometric pictorials of complex objects using 3-D solid models

•  Create auxiliary views automatically from 3-D solid models •  Be able to generate appropriate section views


LEARNING OBJECTIVES (CONT) 4. Create dimensioned drawings from 3-D solid models

•  Understand the basic terminology associated with dimensioning practice •  Demonstrate size, location, and coordinate dimensioning •  Create dimensioned drawings from 3-D solid models •  Create complete working drawings including assembly and detailed

drawings for a “real-life” object 5. Be able to apply geometric dimensioning and tolerancing (GD&T)

•  Understand the overall concept of GD&T •  Be able to recognize GD&T dimensioning on an engineering drawing •  Be able to determine maximum material condition (MMC) and its

implications •  Calculate bonus tolerance allowances as features deviate from MMC •  Be able to recognize and specify GD&T datums •  Be able to visualize tolerance zones as specified in GD&T •  Be able to create GD&T control features on an engineering drawing


LEARNING OBJECTIVES (CONT) 6. Demonstrate a basic understanding of basic manufacturing processes

•  Describe basic machining processes •  Describe casting and forming processes •  Describe basic sheet metal operations •  Create a prototype using a contemporary rapid prototyping

process


4

SAMPLE INDIVIDUAL PROJECTS

Climbing Cam Chris Carter

Lightning SYX Brandon Wheeler

CVT Transmission Eric Eason

Electric Guitar Steve Szabados

SAMPLE INDIVIDUAL PROJECTS


Spinning Reel - Nick Marsiglia

ACADEMIC HONESTY It is expected that each student will do his/her own work Acceptable: Collaboration for the purpose of learning the concepts, SolidWorks, etc. Unacceptable: Copying files

ACADEMIC DISHONESTY WILL BE DEALT WITH HARSHLY


GRAPHICS = LANGUAGE

Graphics is the language of design It allows clear communication of

design intent

It fueled the industrial revolution


5

TWO TYPES OF GRAPHICS The old-fashioned way

•  Sketching by hand •  All you need is a pencil and paper

•  Chalk and blackboard •  Marker and white board

Computer-aided design (CAD) •  AutoCAD/Invetor •  ProEngineer •  SolidWorks •  Catia •  Solidedge •  and many others…


COURSE SKILLS Hand drawing

•  Ability to “read” engineering drawings

Basic knowledge of Geometric Dimensioning and Tolerancing (GD&T) SolidWorks CAD proficiency

•  Parts •  Assemblies •  Drawings

Intro to Simulation •  finite element analysis (FEA) •  computational fluid dynamics (CFD)


HAND SKETCHING IS STILL IMPORTANT!


COMPUTER-AIDED DESIGN PROCESS


CAD Model

ANALYSIS Stress Motion

Heat Transfer Fluid Flow

Opt

imiz

e

MANUFACTURE Machining

Rapid Prototyping: •  3D printer

•  Laser cutter •  Stereolithography

Design Information:

Material Tolerances

Finish etc

DOCUMENT

PhotoWorks Rendering

Engineering Drawing

6

SOLIDWORKS CHARACTERISTICS

Feature-based Constraint-based Parametric

History-based

Associative


SOME SOLIDWORKS FEATURES


Extrude boss/base



Extrude boss/base

Extrude cut



Extrude boss/base

Extrude cut

Circular pattern

7



Extrude boss/base

Fillet

Extrude cut

Circular pattern


Extrude boss/base

Chamfer

Fillet

Extrude cut

Circular pattern



Dome

Extrude boss/base

Chamfer

Fillet

Extrude cut

Circular pattern

Shell


Loft


Sweep

Profile Helical sweep path

MORE SOLIDWORKS FEATURES

8

CONSTRAINT-BASE


Lines constrained to be vertical

Center of circle constrained to mid-point of diagonal

Lines constrained to be horizontal

Lines constrained to be equal length

Design intent remains intact as the part is modified

CONSTRAINT BASED PARAMETRIC


These dimensions are all parameters that specify the highlighted features

Changing the value of the parameters will automatically change the model

HISTORY-BASED


FeatureManager Design Tree

Hint: Rename features as you go to make the model easier to “read”

in the future!

HISTORY-BASED


Can “roll back” part’s design history to

change the order of feature creation, and

hence the model

9

ASSOCIATIVE


Model 1 Model 2

Drawing 2 Drawing 1

SOLIDWORKS FILES


Part .sldprt

Assembly .sldasm

Drawing .slddrw

.eprt

.easm

.edrw

CAD/Fab Course Introduction 35 Sections add clarity

SolidWorks parts are solid objects, no matter how complex Disjoint parts are OK

Shaded model Wireframe model

PART FILES

CAD/Fab Course Introduction 36 Closed Open

Parts can be moved relative to each other

ASSEMBLIES – PARTS MATED

10


SolidWorks drawing file


SolidWorks eDrawing •  Self-contained file •  Ability to zoom, pan, rotate

PERSONAL INFO TEXTBOOKSorg.coloradomesa.edu/~skessler/kessler_msc1/ENGR_125_files/ENG… · 1 ENGR...

Documents

Transcript of PERSONAL INFO TEXTBOOKSorg.coloradomesa.edu/~skessler/kessler_msc1/ENGR_125_files/ENG… · 1 ENGR...