sdc publications © 2012 chapter 13 part drawings and 3d annonations learning objectives: create...

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Chapter 13 Part Drawings and 3D Annonations

Learning Objectives: Create Drawing Layouts from Solid Models Understand Associative Functionality Using the default Borders and Title Block in the

Layout Mode Arrange and Manage 2D Views in Drawing Mode Display and Hide Feature Dimensions Create Reference Dimensions Create 3D annotations in Isometric views

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Tools For Design:AutoCAD® & Autodesk Inventor

Drawings from Parts With the software/hardware improvements in solid modeling, the importance of two-dimensional drawings is decreasing. Drafting is considered one of the downstream applications of using solid models. In many production facilities, solid models are used to generate machine tool paths for computer numerical control (CNC) machines. Solid models are also used in rapid prototyping to create 3D physical models out of plastic resins, powdered metal, etc. Ideally, the solid model database should be used directly to generate the final product. However, the majority of applications in most production facilities still require the use of two-dimensional drawings. Using the solid model as the starting point for a design, solid modeling tools can easily create all the necessary two-dimensional views. In this sense, solid modeling tools are making the process of creating two-dimensional drawings more efficient and effective.

Autodesk Inventor provides associative functionality in the different Autodesk Inventor modes. This functionality allows us to change the design at any level, and the system reflects it at all levels automatically. For example, a solid model can be modified in the Part Modeling Mode and the system automatically reflects that change in the Drawing Mode.

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Drawing Mode – 2D Paper Space

Autodesk Inventor allows us to generate 2D engineering drawings from solid models so that we can plot the drawings to any exact scale on paper. An engineering drawing is a tool that can be used to communicate engineering ideas/designs to manufacturing, purchasing, service, and other departments. Until now we have been working in model space to create our design in full size. We can arrange our design on a two-dimensional sheet of paper so that the plotted hardcopy is exactly what we want. This two-dimensional sheet of paper is known as paper space in AutoCAD and Autodesk Inventor. We can place borders and title blocks, objects that are less critical to our design, on paper space. In general, each company uses a set of standards for drawing content, based on the type of product and also on established internal processes. The appearance of an engineering drawing varies depending on when, where, and for what purpose it is produced. However, the general procedure for creating an engineering drawing from a solid model is fairly well defined. In Autodesk Inventor, creation of 2D engineering drawings from solid models consists of four basic steps: drawing sheet formatting, creating/positioning views, annotations, and printing/plotting.

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Drawing Mode – 2D Paper Space

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Drawing Sheet Format

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Using the Pre-defined Drawing Sheet Formats

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Adding a Base View

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Creating Projected Views

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Displaying Feature Dimensions

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Reference Dimensions

Besides displaying the feature dimensions, dimensions used to create the features, we can also add additional reference dimensions in the drawing. Feature dimensions are used to control the geometry, whereas reference dimensions are controlled by the existing geometry. In the drawing layout, therefore, we can add or delete reference dimensions but we can only hide the feature dimensions. One should try to use as many feature dimensions as possible and add reference dimensions only if necessary. It is also more effective to use feature dimensions in the drawing layout since they are created when the model was built. Note that additional Drawing Mode entities, such as lines and arcs, can be added to drawing views. Before Drawing Mode entities can be used in a reference dimension, they must be associated to a drawing view.

sdc publications © 2012 chapter 13 part drawings and 3d annonations learning objectives: create...

Documents

solid models

d engineering drawings

solid modeling tools

solid model database

d views

drawing mode display

drawing layouts

drawing content