mining and power engineering janusz skrzypacz...

Project co-financed by European Union within European Social Fund

THE DEVELOPMENT OF THE POTENTIAL AND ACADEMIC PROGRAMMES OF WROCŁAW UNIVERSITY OF TECHNOLOGY

EUROPEAN UNION EUROPEAN

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Mining and Power Engineering

Janusz Skrzypacz

CAD/CATIA




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CAD/ CATIA

LECTURE 13

Preparing of the Technical Drawing (3h)




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Module DRAFTING is used to a technical and an assembly drawing creation. Generally drafting file is

associated with Part (technical drawing) or Assembly (assembly drawing). Drafting can be accessed in

the following way: Menu START ==> Mechanical Design ==> Drafting (fig.1).

Fig.1 Way to start the Drafting module

Module DRAFTING starts with the Dialog Box presented on the picture 2 where a user can select

default number of projections, dimensioning standard, paper size, scale, etc..

Fig. 2 Initial Dialog Box for Drafting module

The Main elements of Drafting environment are presented on the picture 3 and 4. Similar to other

CATIA modules the main window of Drafting module is divided into two main sections: Specification

Tree and Paper Sheet area.




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Fig. 3 The Main elements of Drafting environment [1]

Fig. 4 The Main elements of Drafting environment and the main Toolbars [1]




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There are two layers to be accessed in Drafting:

Sheet Background (a frame and a table are located at this layer).

Working view (all elements of the drawing are located on this layer).

A user can change a layer by menu EDIT ==> Sheet Background or EDIT ==> Working view.

Start of a new drawing is begun from a frame and table creation. Title blocks in CATIA can be

generated in two ways:

Manually create a template drawing using geometry tools, located at the Geometry Creation

Toolbar.

Customized macros - recommended method.

Following steps are necessary to insert a title block into a drawing by macros method:

1. Click Edit ==> Background to enter the frame and title editor mode of CATIA.

2. Select the Frame Creation icon.

3. Select the type of title block in the Style of Titleblock pull-down menu (fig.5).

4. Select Creation as the Action to apply.

5. Select Apply.

6. Select OK.

Fig. 5 The Frame Creation Dialog Box [1].




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Fig.6 Working view after the Frame Creation process

Similar to the frame creation process, there are two ways of generation of drawing elements:

manually by Geometry Creation function - not recommended,

in associated way, based on 3D model - recommended.

Creating Views

Views can be created in two ways:

A. Individually - many types of views can be created one by one in an “as needed” approach

(fig.7).

B. View Wizard - the View Wizard is a quick way to select predefined view layouts, or define a

customized view configuration (fig. 7).

Every drawing has to be started from a front view definition. The following steps can be done to

create a front view:

1. Start the drawing with a blank sheet.

2. Select the Front View icon (fig.8).

3. Activate the CATPart by clicking Window ==>Base.CatPart (this step links 3D model with

Drawing module).




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4. Move the mouse cursor over a plane or planar surface to define the front view. A preview

will appear (fig.9).

5. Once you are satisfied with the preview, select the reference and you will automatically be

placed in the drawing with a preview of the view displayed. You can manipulate and tweak

the orientation using the compass.

6. Select anywhere on the drawing sheet to generate the view.

Fig. 7 Extended the Toolbars of View options [1]

Fig. 8 Location of the Front view function




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Fig. 9 Selection of planar surface and view on the result in Drawing module.

If some elements as axis, threads, etc. are invisible in a view, it is necessary to set-up some properties

by clicking the view in Specification Tree by Right Mouse Button and selecting Properties (fig. 10).

Fig. 10 A view properties Dialog Box.

The functions grouped in VIEW Toolbar are very intuitive and simple in use. Therefore, they are not

described in details.




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Definition of a cross section brings to a trace of cutting plane definition (fig. 11).

Fig. 11 The cutting plane definition

Fig. 12 Result of the Offset Section View function




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Definition of Detail views brings to an area selection that would be close-up.

Fig. 13 Result of Detail View function

Dimensions

Using the Dimensions toolbar, it is possible to create the following types of dimensions (fig. 14):

A. Linear

B. Angular

C. Radius

D. Diameter

E. Chamfer

F. Thread




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Fig. 14 Types of dimensions [1]

The roughness of the surface can be defined by Roughness Symbol . When surface (trace of

surface) would be selected the Dialog Box would be opened (fig. 15) where all options can be set.

Fig. 15 The Dialog box of Roughness Symbol function.




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The Geometrical Tolerances of the surfaces can be defined by . When surface (trace of

surface) is selected the Dialog Box will be opened (fig. 16) where all options can be set.

Fig. 16 The Dialog box of Geometrical Tolerances function.

If it is needed to insert a fit or tolerances for selected dimension(s) it will be selected with aid of

Properties (Right mouse button) and Tolerance Panel (fig. 17).

Fig. 17 The Dialog box of a dimension Properties




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Exercise

Let's prepare the technical drawings of the following parts:

Shaft with gear – Lecture 6.

Housing – Lecture 6.

Part from Lecture 4 – Exercise 2.

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