Working Drawings

1. Working Drawings

2. Overview • Production or working drawings are specialized engineering drawings that provide the information required to make the part or assembly of the final design. • Working drawings are the complete set of standardized drawings specifying the manufacture and assembly of a product based on its design.

3. Working Drawings • Working drawings of an assembly include: • Detail drawings of each nonstandard part • An assembly or subassembly drawing showing all the standard and nonstandard parts in a single drawing • A bill of materials (BOM) • A title block

4. Detail Drawings • A detail drawing is a dimensioned, multiview drawing of a single part, describing the part’s shape, size, material, and finish in sufficient detail for the part to be manufactured based on the drawing alone.

5. Detail Drawing Example

6. Detailed Drawings • Adhere to ANSI and company standards • Lettering • Dimensioning • Part numbers • Notes • Tolerances

7. Standard Parts • Standard parts such as threaded fasteners, bushings, and bearings are NOT drawn as details since they are normally purchased • Standard parts ARE shown in the assembly drawing

8. Assembly Drawings • An assembly drawing shows how each part of the design is put together. • Very large assemblies may be broken into subassemblies.

9. Assembly Drawings • Assembly drawings normally consist of the following • All parts, drawn in operating position • A parts list or bill of materials • Detail callout • Machining and assembly operations and critical dimensions related to these functions

10. Assembly Drawings • Assembly drawings are used to describe how parts are put together. • The views chosen should describe the relationships of the parts • The number of views chosen should be the minimum necessary to describe the assembly

11. Assembly Drawings • Dimensions are not shown on assembly drawings, unless necessary to provide overall assembly dimensions, or to assist machining operations necessary for assembly • Hidden lines are omitted in assembly drawings, except when needed for assembly or clarity

12. Assembly Drawings • 3 basic types of assembly drawings • Outline assembly • Sectioned assembly • Pictorial assembly

13. Outline Assembly • Gives general graphic description of the exterior shape • Typically used for parts catalogs and installation manuals for simple assemblies • Omit hidden lines, except for clarity

14. Outline Assembly Example

15. Sectioned Assembly • Gives a general graphic description of the interior shape by passing a cutting plane through all or part of the assembly. • Typically, show multiple views with one view in full section.

16. Sectioned Assembly Example

17. Sectioned Assemblies • Important conventions to follow: • Standard parts (fasteners, bearings, etc.) are not sectioned, but drawn with all exterior features • Adjacent parts in sectioned are crosshatched at different angles and/or different hatch patterns • Thin parts, such as gaskets, are shown solid black

18. Pictorial Assembly • Gives a general graphic description of each part, and uses center lines to show how the parts are assembled • Normally drawn in isometric view with hidden lines removed or rendered • Typically used in maintenance manuals

19. Pictorial Assembly Example

20. Pictorial Assembly Example

21. Exploded Views in Unigraphics • Exploded Views Toolbar

22. Create the explosion in your assembly Create the explosion Edit the location of each part You can view it exploded or not

23. Exploded Views in Unigraphics • Creating an explosion does NOT move the parts • It suppresses the constraints • You will need to move the parts itself using the edit explosion tool • The auto-explode components tool may also be used on simple assemblies

24. Select which parts to move • Move the part • X,Y, or Z-translation (click on the axis and drag) • X,Y, or Z-Rotation (click on the round dot and drag) Manipulate the coordinate system without moving the part

25. Place a view of the exploded assembly on a drafting sheet (IT HAS TO BE A TFR-TRI VIEW TO SHOW THE EXPLOSION)

26. Part Numbers • Every part in an assembly is assigned a part number • Part number is typically alphanumeric • Used to track part within the company • Leader line with balloon assigns a detail number to each part • Sequential number • Referenced in bill of materials or notes

27. Bill of Materials • Also referred to as parts list • Normally shows the following for each part: • Detail number • Quantity needed for assembly • Description or name of part • Catalog number (for standard parts) • Part number (for company parts)

28. Bill of Materials Example

41. Title Blocks • Used to record important information necessary for working drawings • Normally located in the lower right corner of the drawing sheet • Both ANSI standard and company specific title blocks are common

42. Title Blocks • Typically include the following information: • Name/address of company • Title of drawing • Drawing number • Approval names and dates • Scale • Sheet number

43. Title Block Example

44. Revision Block • Used to track changes in design • Normally located in upper right corner of drawing

45. Tolerance Specifications • For those dimensions that are not specifically toleranced, a general tolerance note is used • Typically placed in the lower right corner, near the title block