Documentation Documentation Once a design has been approved

Documentation

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.

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

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.

Part Drawing Example

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.

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

Assembly Drawings • Assembly drawings – Show 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

Assembly Drawing Example

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)

Types of Assembly Drawings • • • Design Assembly General Assembly Detail Assembly Erection Assembly Subassembly Pictorial Assembly

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

Design Assembly • Design assemblies often based on preliminary design process sketches before the product is modeled

General Assembly • Most common type of assembly drawing is General Assembly • Displayed as multiview drawing sometimes with a section view • General assemblies are not dimensioned

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

Example Detail Assembly

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

Subassembly Drawing Complex or large assemblies often communicated through subassembly drawings Flashlight Subassembly

Pictorial Assembly • Usually isometric or perspective drawing • May be rendered to imitate photographic quality • Uses include – Sales promotion – Customer selfassembly – Maintenance procedures

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

Pictorial Assembly Drawings • Exploded pictorial assembly drawings commonly show individual components fit together

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

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

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

Example Parts List

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

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

Parts List Location