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Working Drawings Overview Production or working drawings are specialized engineering drawings that provide the information required to make the part or assembly of the final design.

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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.


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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


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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.



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Detailed Drawings

  • Adhere to ANSI and company standards

    • Lettering

    • Dimensioning

    • Part numbers

    • Notes

    • Tolerances


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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


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Assembly Drawings

  • An assembly drawing shows how each part of the design is put together.

  • Very large assemblies may be broken into subassemblies.


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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


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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


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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


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Assembly Drawings

  • 3 basic types of assembly drawings

    • Outline assembly

    • Sectioned assembly

    • Pictorial assembly


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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



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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.



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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


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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




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Exploded Views in Unigraphics

  • Exploded Views Toolbar


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Create the explosion in your assembly

Create the explosion

Edit the location of each part

You can view it exploded or not


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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


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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


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


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Part Numbers (IT HAS TO BE A TFR-TRI VIEW TO SHOW THE EXPLOSION)

  • 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


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Bill of Materials (IT HAS TO BE A TFR-TRI VIEW TO SHOW THE EXPLOSION)

  • 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)


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Bill of Materials Example (IT HAS TO BE A TFR-TRI VIEW TO SHOW THE EXPLOSION)


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Title Blocks (IT HAS TO BE A TFR-TRI VIEW TO SHOW THE EXPLOSION)

  • 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


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Title Blocks (IT HAS TO BE A TFR-TRI VIEW TO SHOW THE EXPLOSION)

  • Typically include the following information:

    • Name/address of company

    • Title of drawing

    • Drawing number

    • Approval names and dates

    • Scale

    • Sheet number


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Title Block Example (IT HAS TO BE A TFR-TRI VIEW TO SHOW THE EXPLOSION)


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Revision Block (IT HAS TO BE A TFR-TRI VIEW TO SHOW THE EXPLOSION)

  • Used to track changes in design

  • Normally located in upper right corner of drawing


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Tolerance Specifications (IT HAS TO BE A TFR-TRI VIEW TO SHOW THE EXPLOSION)

  • 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


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