Small-Volume - Engineering Design and Analysis - Lecture Slides, Slides of Computer-Aided Design for Engineers

Download Small-Volume - Engineering Design and Analysis - Lecture Slides and more Slides Computer-Aided Design for Engineers in PDF only on Docsity!

Engineering Design

for Small-Volume Electro-

Mechanical Systems

To Build a Designed Object

• Say you were Asked to BUILD or CONSTRUCT something using basic hand tools
• You would need (at a minimum)
  • A list of Parts with P/N’s and Qtys
  • Parts FABRICATED specially for this Object
  • Parts PURCHASED from Catalogs for this Object (a.k.a. “Standard Parts”)
  • Instructions on how ASSEMBLE the Object

When Designing Something…

• Think About CRITICAL Issues
  • Will It WORK
  • Will it Meet the SCHEDULE & BUDGET
  • Can it be BUILT from MY Design

Documentation?

• Ask Yourself: “If I were Building this object What Info would I need?”

Discussion Scope

• We Examine what it takes to BUILD small quantities (dozens to hundreds per year) of Engineering-Designed ElectroMechanical Systems for Sale
• This Discussion Does NOT Address the FUNCTIONAL PERFORMANCE of the design; only what it takes to actually BUILD IT, regardless of how Well it works

BUILDING SomeThing is HARD

• The Build-Process exposes
  • Incomplete Design Documents
    • Not Sufficient Information to Construct
      • BluePrints Missing/Incorrect Dimensions or Notes; e.g., » Inconsistent Material CallOut » Missing/Confusing Lines » Missing Surface Finish
      • Schematics or Assembly Drawing Missing/Incorrect ID-Information; e.g., » Missing Balloon CallOut for O-Ring, Bolt, Valve, etc. » Missing Value for Resistor or Capacitor

BUILDING SomeThing is HARD

• The Build-Process exposes
  • Design Errors
    • Mechanical Elements do NOT FIT
    • Electrical Elements SHORT or do not PowerUp
    • Can Not be Fabricated or Assembled as Designed
    • Mechanical Structures are NonRigid
      • “Floppy” or “Doingy” or “Cheesy” of “Wobbly”
    • Electrical or Fluid Systems are UnderPowered or Noisy or Unstable - “Whimpy” or “Flakey” or “Glitchy”

To BUILD an Engineered Design

• Dot “i’s ” & Cross “t’s” on All FABRICATION Drawings (the “BluePrints”) - A single Missing-Dimension or Superfluous Line or Missing Feature-Callout Brings Production to a HALT - OMISSIONS result in ReWork or Scrap; e.g.; - Forgetting a needed Removed-Feature (Hole or Slot or Notch or Groove) - Superfluous Removed-Feature (‘extra” hole)

Designed Part (Piece Part)

Typical Assembly Drawing

BalloonCallOut On-Dwg BoM

Tools at the Engineer’s Disposal

• INGENUITY & CREATIVITY

• MOST Important
• Knowledge of SCIENCE and MATHEMATICS
• Technical CATALOGS
• “BluePrint” Making Software
• Standard Fabrication Methods
• Machining, Welding, Injection-Molding, etc.

Small Volume Design FlowChart

Supplier Contact Info

Purchased Part Catalog No.

Purchased Parts

Physical Design to Scale (LayOut)

Material Selection

Fabrication Notes

Formal “BluePrints” (Use Std TitleBlock)

To Fabricator Machine Shop, etc.

Fabricator contact Info Fabricated Piece-Parts

Assy Parts List (Bill of Materials)

Order & Receive Purchased Parts Assembly Drawing & Documentation

Physical Assembly and/or Construction

All Done for Today

Engineering

Design Pyramid