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Engineering Design GE121 Design Drawings and Fabrication Specifications

Engineering Design GE121 Design Drawings and Fabrication Specifications. Lecture 15A. Design Drawings, Fabrication Spec’s: Designing Isn’t Building. Design Drawings and Fabrication Specifications are an essential part of reporting in many Design Projects

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Engineering Design GE121 Design Drawings and Fabrication Specifications

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  1. Engineering DesignGE121Design Drawings and Fabrication Specifications Lecture 15A

  2. Design Drawings, Fabrication Spec’s:Designing Isn’t Building • Design Drawings and Fabrication Specifications are an essential part of reporting in many Design Projects • Allows someone you may not even know, to build your design • Must pay attention to the kind of drawings, and different standards associated with Final Design Drawings

  3. Design Drawings • Can include: • Freehand • CADD Models • Sketches • Often include “marginalia” • Notes for the user of the drawing Fig. 6.2 p141

  4. Design Drawings(continued) • Layout Drawings • Working drawings that show the major parts or components, and their relationships • Usually to scale • Do not show tolerances • Subject to change as design process continues Fig. 6.3 p142

  5. Design Drawings(continued) • Detail Drawings • Show Individual parts or components and their relationship • Show tolerances • Indicate materials • Any special processing • Conform with existing Drawing standards • Changed only with a ‘Change Order’ Fig. 6.4 p143

  6. Design Drawings(continued) • Assembly Drawings • Show how the individual parts or components fit together • Exploded view commonly used • Components shown by part number, or on entry in a Bill of Materials Fig. 6.5 p144

  7. Design Drawings(continued) • Bill of Materials • List of parts required to create the artifact • Standards for Drawings • Various standards, depending on discipline • ANSI is a clearing house for various drawing standards for various disciplines

  8. Fabrication Specifications • Set of plans that form the basis on which the designed artifact will be built • Should be: • Unambiguous (role and place or each part unmistakable) • Complete (comprehensive) • Transparent (readily understood) • Allows someone totally unconnected to the design to be able to build it • Our focus in this class is conceptual design – we will not discuss fabrication specifications in detail

  9. Fabrication Specifications (continued) • Many of the components/parts may be purchased from vendors, requiring a great deal of detailed, disciplinary knowledge • Some requirements of fab spec’s can be: • Physical dimensions • Kinds of materials • Unusual assembly conditions • Operating parameters (artifact’s response/behaviour) • Maintenance / Lifecycle requirements • Reliability requirements • Packaging requirements • Shipping requirements • External markings (usage/warning labels) • Unusual or special needs

  10. Philosophical NotesSpecifications / Drawings / Pictures • Type of drawings and level of detail varies by discipline • Schematic often good in electronics, but not in mechanical • Types of drawings have evolved separately in various fields • Visual representation is often much more easily interpreted than written • Photographs may begin to become more important (Google Earth  GIS Systems)

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