1. Documentation

2. Documentation
Once a design has been approved and fully researched, the part needs to be prototyped or manufactured.
To do so, we need to have the appropriate documentation to communicate the idea to everyone in the company.
Documentation is the most difficult, time consuming, yet most important part of engineering communication.
This documentation is done with working drawings.

3. Working Drawings
Working drawings are a complete set of drawings that document how an object will be manufactured and assembled. Each set should include:
Part Drawings
Assembly Drawings
Parts List
Specifications or Instructions

4. Part Drawing
A part drawing is the drawing that contains all the information for making one part of the design.
This drawing consists of dimensioned orthographic views. If necessary, section, auxiliary, detail, and an isometric view can help document the part.
All features of the part will be dimensioned so that it can be manufactured.

5. Part Drawing Example

6. Title Blocks
Title blocks are necessary to identify the drawing and the general details that go along with that part. An example showing the parts of a title block are shown on the next slide.

7. © Project Lead The Way, Inc.
Title Blocks
Size of sheet. Important when reading a drawing to
ensure that the drawing is printed to display the
proper scale properly. Also valuable when printing.
General notes and information. Located here
you will see information on fillet and rounds,
tolerances, and other general information that
would take up too much space on the drawing if
repeated on every feature.
Zoning is used to find specific locations on the
drawing. Usually shown in numbers and letters.
Example: ANSI Large style title block.
Title blocks can be customized by a company
but may contain the following information
Remember working drawings are made of many
different types of drawings. More than one sheet
usually goes with a design.
The drawing may be checked by Quality
Assurance to be sure that it meets all company
standards and requirements.
Title of the project, as opposed to a
specific part.
Name of person who checked the drawing. Just
like first drafts of papers written in English class,
drawings go through many revisions.
Another person will check the drawing and
approve the part for manufacture.
Documentation of how many times the drawing
has been changed.
Name of person who created the drawing.
Drawing number or specific part name in
relationship to the total design.
Scale of the part is important so that the reader
understands the relative size of the part.
© Project Lead The Way, Inc.

8. Assembly Drawings Assembly drawings
Show how parts of a multi-component design fit together
Generally depict at least one orthographic projection
Full section views often used to show necessary internal features

9. Assembly Drawing Example

10. Information on Assembly Drawings
Assembly drawings may contain
One or more views (including sections or auxiliaries)
Enlarged views of small details
Overall or specific dimensions for assembly
Notes on manufacturing processes
Balloons to indicate item numbers
Parts list or Bill of Materials (BOM)

11. Types of Assembly Drawings
Assembly Drawings, Balloons, and Parts Lists
Introduction to Engineering Design TM
Unit 2 – Lesson 2.3 – Advanced Modeling Skills
Types of Assembly Drawings
Design Assembly
General Assembly
Detail Assembly
Erection Assembly
Subassembly
Pictorial Assembly
There are several different types of assembly drawings. The style and information included depends on the needs of the end user. As with all drawings being clear and concise with the information are the goal. Detailed drawings cover the size and shape issues on each individual parts. The assembly drawings are used to deliver any and all other information needed in the life cycle of the product.
Project Lead The Way, Inc.
Copyright 2007

12. Assembly Drawings, Balloons, and Parts Lists
Introduction to Engineering Design TM
Unit 2 – Lesson 2.3 – Advanced Modeling Skills
Design Assembly
Design assemblies show relationships between components
E.g., kinematic relationship between 360° fly wheel rotation and extreme angular motion of piston cylinder body
Project Lead The Way, Inc.
Copyright 2007

13. Assembly Drawings, Balloons, and Parts Lists
Introduction to Engineering Design TM
Unit 2 – Lesson 2.3 – Advanced Modeling Skills
Design Assembly
Design assemblies often based on preliminary design process sketches before the product is modeled
Project Lead The Way, Inc.
Copyright 2007

14. General Assembly
Most common type of assembly drawing is General Assembly
Displayed as multi-view drawing sometimes with a section view
General assemblies are not dimensioned

15. Assembly Drawings, Balloons, and Parts Lists
Introduction to Engineering Design TM
Unit 2 – Lesson 2.3 – Advanced Modeling Skills
Detail Assembly
Detail assembly combines an assembly view with several parts as dimensioned multi-view drawings on one drawing sheet
Reduces number of drawing sheets needed
More appropriate for designs with small numbers of components
Project Lead The Way, Inc.
Copyright 2007

16. Example Detail Assembly
Assembly Drawings, Balloons, and Parts Lists
Introduction to Engineering Design TM
Unit 2 – Lesson 2.3 – Advanced Modeling Skills
Example Detail Assembly
Project Lead The Way, Inc.
Copyright 2007

17. Assembly Drawings, Balloons, and Parts Lists
Introduction to Engineering Design TM
Unit 2 – Lesson 2.3 – Advanced Modeling Skills
Erection Assembly
Similar to general assemblies, except dimensions and fabrication specifications are commonly included
Typically associated with cabinetry or products made from structural steel
Used for fabrication and assembly
Project Lead The Way, Inc.
Copyright 2007

18. Assembly Drawings, Balloons, and Parts Lists
Introduction to Engineering Design TM
Unit 2 – Lesson 2.3 – Advanced Modeling Skills
Subassembly Drawing
Complex or large assemblies often communicated through subassembly drawings
Flashlight Subassembly
Project Lead The Way, Inc.
Copyright 2007

19. Pictorial Assembly Usually isometric or perspective drawing
May be rendered to imitate photographic quality
Uses include
Sales promotion
Customer self-assembly
Maintenance procedures

20. Pictorial Assembly Drawings
Pictorial assemblies often used in catalogs, journal articles, and advertisements
This pictorial is sectioned to show interior details

21. Pictorial Assembly Drawings
Exploded pictorial assembly drawings commonly show how individual components fit together

22. Balloons
A balloon is a circle with a single number connected to an assembly component with a leader line

23. Assembly Drawings, Balloons, and Parts Lists
Introduction to Engineering Design TM
Unit 2 – Lesson 2.3 – Advanced Modeling Skills
Balloon Guidelines
Balloons on a drawing are same size
Balloons grouped in an easy-to-read pattern
Balloon numbers correspond to item numbers in parts list
Balloons do not have horizontal or vertical leader lines
Project Lead The Way, Inc.
Copyright 2007

24. Parts List
Parts list is a table with information about each part contained in an assembly
Item numbers correspond with balloon numbers

25. Assembly Drawings, Balloons, and Parts Lists
Introduction to Engineering Design TM
Unit 2 – Lesson 2.3 – Advanced Modeling Skills
Example Parts List
Project Lead The Way, Inc.
Copyright 2007

26. Parts List Information
Assembly Drawings, Balloons, and Parts Lists
Introduction to Engineering Design TM
Unit 2 – Lesson 2.3 – Advanced Modeling Skills
Parts List Information
Items typically on a parts list
Item number from balloons
Quantity of a particular part needed for assembly
Part or drawing number as reference to the detail drawing
Description (e.g., part name or complete description of part)
Material identification of part
Information about vendors
Project Lead The Way, Inc.
Copyright 2007

27. Assembly Drawings, Balloons, and Parts Lists
Introduction to Engineering Design TM
Unit 2 – Lesson 2.3 – Advanced Modeling Skills
Parts List Location
Location of parts list specified by company standard
Common locations include
Above title block (most common)
Upper right corner
Upper left corner
Convenient location on drawing
Project Lead The Way, Inc.
Copyright 2007

28. Assembly Drawings, Balloons, and Parts Lists
Introduction to Engineering Design TM
Unit 2 – Lesson 2.3 – Advanced Modeling Skills
Parts List Location
Project Lead The Way, Inc.
Copyright 2007