Working Drawings - Gears EdS



|Lesson Title: |

|Working Drawings |

|Week |National Education Standards |

| |Math: |

| |1.) Analyze characteristics and properties of two- and three-dimensional geometric shapes and develop |

| |mathematical arguments about geometric relationships |

|Day |Science: |

| |Technology: Visualization and CAD |

Introduction:

A working drawing is a drawing that supplies the information and instructions necessary to manufacture or construct a mechanism, structure or component.

Working drawings can take either of two forms:

1.) Detail Drawings

Supply the information necessary to manufacture a part or component. Detail drawings can include orthographic and auxiliary views and all the dimensions and constraints required to accurately describe the object. Working drawings often include an isometric or pictorial view that describes the object similar to the drawing below.

2. Assembly Drawings

Assembly drawings provide the information necessary to assemble 2 or more components or structural parts. (See examples below)

Working drawings are legal documents. Since they are often sent to other companies (sub-contractors) the drawing formats should conform to corporate, national or international standards. The American National Standards Institute (ANSI) or the Canadian Standard Association are used by significant numbers of North American Industries.

Assembly Drawings

Objective:

Students who complete this lesson will:

1. Create a detail drawing of one or more of the components used in the construction of their trebuchet.

2. Create and assembly drawing of one or more of the mechanisms (Throwing Arm Assembly) or structural assemblies used in the construction of their trebuchet.

3. Use a defined standard format to dimension and present the drawings per the examples above.

Terms:

|Shape Description |Isometric |Auxiliary Views |

|Size Description |Orthographic |Title Block |

|Specifications |Perspective |Tolerances |

|Scale |Sectional Views |National Standards (ANSI) |

Materials:

|CAD Software |CAD WorkStation |Printer |

|Engineering Drawing Text |Drafting Tools | |

Lesson Text:

SolidWorks Tutorial 2003 by David C. Planchard and Marie P. Planchard (Chapter 3)

Activities:

Create detail and assembly drawings of the trebuchet and trebuchet components.

Worksheets:

SolidWorks Tutorial 2003 by David C. Planchard and Marie P. Planchard (Chapter 3)

Resources:

Use available engineering drawing textbooks that cover dimensioning and the creation of working drawings, multi-view drawings and assembly drawings.

Assessment:

Based on the successful completion of CAD assignments. Note: Be certain to preserve all your worksheets, assignments etc in chronological order in your notebook.

Working drawings should contain the following information:

Shape Description

This includes all the views necessary to accurately describe the object or assembly. Sectional views, auxiliary views and enlarged detail views may be required to provide all the visual information needed to manufacture or assemble the component or structure.

Size Description

All the dimensions and tolerances that completely describe the size and location of shape features on the part must be provided. Call out all required dimensions once. Do not include duplicate or unnecessary dimensions.

Specifications

Specifications are notes and information pertaining to materials, finishes, heat treatment, general tolerances and required quantities.

In addition to the required drawing information described above. It is always best practice to include:

Drawing number and revision, scale, date, drawing authors name, company name address and contact information.

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