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Bruce Mayer, PE Registered Electrical & Mechanical Engineer BMayer@ChabotCollege

Engineering 22. Working Drawings-1. Bruce Mayer, PE Registered Electrical & Mechanical Engineer BMayer@ChabotCollege.edu. Skill-Development Goals. Construct “Working Drawings” from the Two Primary Components ASSEMBLY Drawing Parts List (a.k.a. Bill of Material, or BoM)

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Bruce Mayer, PE Registered Electrical & Mechanical Engineer BMayer@ChabotCollege

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  1. Engineering 22 WorkingDrawings-1 Bruce Mayer, PE Registered Electrical & Mechanical EngineerBMayer@ChabotCollege.edu

  2. Skill-Development Goals • Construct “Working Drawings” from the Two Primary Components • ASSEMBLY Drawing • Parts List (a.k.a. Bill of Material, or BoM) • Use AutoCAD to Insert and Scale Up/Down a Standard Title Block to Fit the Assembly Drawing • Place BoMs on the AutoCAD Title Block

  3. Working Drawings • Defined → A final set of production drawings providing all of the necessary details and specifications needed to Fabricate and/or assemble a product or system. • Three Main Parts • Detail (Fabrication) Drawings • Assembly drawings • Parts lists • Reference Dwgs • Layouts • Fit & Function • Schematics • Electrical & Plumbing • Concept Drawings • 3D, Flow Charts, etc.

  4. Detail Drawings • Show all necessary dimensioned views needed to make the part. • Indicate material and tolerances. • Indicate any finish treatments (plating, etc.) and requirements for surface-finish roughness. • Detail drawings are not necessary for purchased parts, only for parts that will be manufactured to the Engineer’s design. • It is often preferred to show just one part per sheet so the same part drawing can be included in multiple assemblies without confusion.

  5. Fabrication Drawing TWO Parts on this Sheet Poor form

  6. Fabrication Drawing

  7. Legal Interpretations • A part manufactured to within specifications and per the Drawing MUST Be Purchased • Parts can be rejected for not meeting any ONE Specification of a Drawing-Feature • Some Gray Areas • Unreleased Drawings & Sketches • Usually the ORIGINATOR Bears The Risk • Typically Only Done in “Short-Run” Situations • Originator vs. Receiver Interpretation • Drawings and Specs Need to be PRECISE

  8. Assembly Drawings • Can be exploded-isometric, sections, single views, exterior views, or assembled isometric drawings. • Not usually dimensioned unless there are dimensions that are critical to maintain during assembly. • Hidden lines not usually needed.

  9. Assembly Drawing

  10. Parts Lists (Bill of Materials) • Parts list (a.k.a. “BoM”) on assembly drawings or combined assembly and detail drawings indicates part name, item number, material, and quantity required. • Parts List May be on A Separate Document • Reference in NOTES Section of the Dwg • Often a company stock number is also included • Part ID on Dwg • Balltags on drawing indicate which part is being called out (next slide) • Part No. may be Placed Directly on Drawing

  11. Ball-Tag BoM Assy Dwg BallTag Ref. toParts List

  12. Direct P/N Callout; No BallTags

  13. Direct P/N Callout; No BallTags

  14. Pictorial Assy w/ BallTags

  15. Ball-Tag Patent Drawing

  16. Separate Sheet Parts list

  17. Hatch Patterns Indicate Parts • Different hatch patterns indicate which part is which in the assembly section. • The material for the part can be identified by different hatch patterns. • The hatch patterns run at different angles on different parts in the assembly

  18. Thin Parts Filled In Black • Thin parts like the gasket shown here are too small to hatch. • Parts like these are filled in solidly with black.

  19. Cross-Section Layout • Hatch Direction and/or Color Clearly Distinguishes Different parts

  20. Reference Drawings • Parts/Systems are Typically NOT CONSTRUCTED to REFERENCE Drawings • Ref Drawings are Created to Aid in the Understanding of • Fabrication • Assembly • Trouble-Shooting • Maintenance • Product Use

  21. Ref Drawings - Types • Layout Drawings • Used for Fit and Function Understanding • Schematics → Component Interconnect • Used to Aid in Understanding of System Function • Classic Types • Plumbing • Electrical • Many Other Types Exist

  22. Layout Dwg – Plumbing System

  23. Plumbing Schematic (For Layout)

  24. Electrical Schematic

  25. Combined Assy & Schematic Typically used in conjunction with a LayOut Dwg

  26. Mech Assy Layout

  27. Use Instructions

  28. All Done for ToDay Yet AnotherWorkingDwg

  29. Engr/Math/Physics 25 Appendix  Time For Live Demo Bruce Mayer, PE Licensed Electrical & Mechanical EngineerBMayer@ChabotCollege.edu

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