The command section is followed by tutorials that are created using these commands. This approach allows the user to use this textbook initially as a learning tool and then later use it as a reference material. The author provides free technical support to all users of this textbook. The users can contact techsupport cadcim.
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The base sketch to create this solid model is shown in Figure Figure Solid Model of a Link. Figure Base sketch for the solid model. The Sketcher workbench provides the space and tools to draw sketches of the solid model.
Generally, the first sketch that you draw to start the design is called the base sketch, which can be converted into a base feature. However, once conversant with the advanced options of CATIA, you can also use derived feature or a derived part as the base feature. In this chapter, you will learn more about the sketching tools that are available for drawing and displaying the sketches in the Sketcher workbench.
To draw a sketch, you need to invoke the Sketcher workbench in the Part Design workbench or in the Assembly Design workbench. To invoke the Sketcher workbench, choose the Sketch button from the Sketcher toolbar and then select a plane on which you need to draw the sketch.
After drawing the sketch in this environment, proceed to the Part Design or the Wireframe and Surface Design workbench to convert the sketch into a solid model or a surface model. Close the Product1 file and start a new file in the Part Design workbench. You will learn more about the Product files in the later chapters. Now, to start a new file in the Part Design workbench, choose File from the menu bar.
The New dialog box is displayed, as shown in Figure You can also write word Part in the Selection edit box available at the bottom of the List of Types list box. Choose the OK button. Figure The New dialog box A new file in the Part Design workbench will be displayed on the screen, as shown in Figure The various standard tools like Specification Tree, Compass, Geometry Axis will help you in completing the design.
The Specification Tree is displayed on the top left corner of the screen. The Compass is displayed on the top right corner while the Geometry Axis is displayed on the bottom right corner of the screen. By default, check marks are displayed on the left of Geometry, Specifications, and Compass in the menu bar, suggesting that their display is turned on. Choose these options again to turn off their display. The display of these tools should be turned off only when the geometry area is too small to view the model, else it is recommended not to hide these standard tools.
You can also use the F3 key from the keyboard to toggle the display of Specification Tree. To invoke the Sketcher workbench, choose the down arrow available on the right of the Sketcher button in the Sketcher toolbar; a flyout appears. The flyout is now detached from its parent toolbar and becomes an independent toolbar. Figure shows the Sketcher flyout as an independent toolbar. The two buttons that are available with the Sketcher toolbar are Sketcher and Sketch with Absolute Axis definition.
The next section focuses on invoking the Sketcher workbench using these two buttons. You are prompted to select a plane, planar face, or a sketch. Select a plane from the three default planes that are available in the Specification Tree or from the geometry area. The Sketcher workbench, that appears after you select the YZ plane as the sketching plane, is shown in Figure The selected plane will be parallel to the screen and you are prompted to select an object or a command.
The sketching components that are displayed in the geometry area are discussed later in this chapter. To exit the sketcher workbench, choose the Exit workbench button from the Workbench toolbar. Evaluation chapter. This is done using the Sketch with Absolute Axis definition option. To invoke the Sketcher workbench using this option, choose the Sketch with Absolute Axis definition button from the Sketcher toolbar. The Sketch Positioning dialog box appears, as shown in Figure You are then prompted to select a plane, two lines, an axis system, a planar face, or a sketch.
You can set the absolute axis by using the options available in this dialog box. These requirements include modifying units, grid settings, and so on. The next section focuses on setting these parameters. Choose the Parameters and Measure option; tabs corresponding to this selection will appear on the right side of the Options dialog box. Now, choose the Units tab.
The Options dialog box after invoking the Units tab is shown in Figure After setting units, choose the OK button from the Options dialog box. Modifying the Grid Settings On invoking the Sketcher workbench, you will observe two types of lines in the geometry area, flowing in the horizontal and vertical directions. These are continuous and dotted black lines. The spacing between two dotted lines is called Graduation, while the spacing between two continuous black lines is called Primary Spacing.
The mesh that is formed because of the intersection of these lines in vertical and horizontal direction is called Grid. In other words, Primary Spacing and Graduation define the Grid. By default, the Graduations is set to 10 in both horizontal and vertical direction.
The default Primary Spacing value is mm. Though you can change the Primary Spacing and Graduation value in horizontal and vertical direction individually, yet it is recommended not to change these values.
If the values of Primary Spacing or Graduations in horizontal are different than those in the vertical direction, then the Grid is said to be distorted. Choose the Mechanical Design option from the tree on the left side of the dialog box. Choose the Sketcher option to display the Sketcher tab on the right side of the Options dialog box, as shown in Figure The edit boxes of Primary Spacing and Graduations under H row are already enabled.
Here, V means vertical direction. Next, enter the values in the edit boxes corresponding to the H and V directions. Choose OK to apply the newly formed Grid to the Sketcher workbench. Note, all the files that you open or start in the Sketcher workbench, henceforth, will use these values for the Grid.
These terms are discussed in the following section. Specification Tree The Specification Tree is a manager, which keeps a track of all the operations that are performed on the model.
When you invoke the Sketcher workbench, a new member or branch, Sketch. Now, you can view the Sketch. Figure shows the Tree in expanded form. The various levels under Sketch.
While expanding the branch of the Specification Tree, you may accidentally click on the branch lines. This will make the Specification Tree active and consequently the geometry area will be frozen. Note, that the color of the default planes will turn grey. Now, zooming and panning will respectively resize or reposition the Specification Tree, instead of the geometry view. The geometry area can be reactivated by clicking on the branch line again.
AbsoluteAxis In Sketcher workbench, the default horizontal and vertical axes passing from the origin 0,0 , to infinity are referred to as AbsoluteAxis. The horizontal and vertical axis in the geometry area will be highlighted, when the AbsoluteAxis is selected from the Specification Tree. The levels associated with this branch are discussed below. Origin The Origin in Sketcher workbench is the point where the absolute horizontal axis intersects the absolute vertical axis.
The coordinates for origin are 0,0. Origin is widely used while applying dimensional constraints to the sketches. You will learn more about dimensional constraints in the later chapters.
HDirection The direction that is parallel to the horizontal axis is referred to as horizontal direction. The HDirection is mostly used to constrain a sketch.
VDirection The direction that is parallel to the vertical axis is referred to as vertical direction. The VDirection is mostly used to constrain a sketch. The branches in the Specification Tree will increase as the design process continues. While drawing and constraining sketches, you will learn more about the branches that are associated with the Specification Tree in Sketcher workbench. By default, the snap mode is active.
Catia For Designers V5r13
About 40 mechanical engineering industry examples are used as tutorials in this book and an additional 25 as exercises to ensure that the user can relate his knowledge of this book with the actual mechanical industry designs. The command section is followed by tutorials that are created using these commands. This approach allows the user to use this textbook initially as a learning tool and then later use it as a reference material. The author provides free technical support to all users of this textbook. The users can contact techsupport cadcim. You can easily customize these PowerPoint Presentations based on the requirements of the course you are teaching.
CATIA For Designers V5R13
ISBN 13: 9781932709025
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