Sketch Modelling In Catia - Online Article

This tutorial and other tutorial that follow provide step-by-step instructions on how to create a sketch in CATIA V5 R14's sketcher workbench. Sketch workbench is used to create CATIA two dimensional sections. Objects made in sketcher workbench are saved with an *.part file extension and are the base for any object in other workbenches and modeling applications.

In this tutorial you will create the section shown below. The following topics are covered.

  • Starting a new object file in sketcher workbench.
  • Sketching an object with the help of provided toolbars in this workbench.
  • Applying constraints on the object.
  • Saving an object.

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Creating a new object in sketcher workbench

Step 1: Start CATIA.

Step 2: Select the Sketcher workbench from Start > Mechanical Design > Sketcher.

Step 3: Select the part name and enter the workbench.

Step 4: Select the working plane and then click on the sketch icon to enter the sketcher. (These steps are already described with screen shots in Face to face with CATIA)

Sketching the object

Step 1: First confirm that the toolbars Profile, Operation, Standard, View, Sketch tools and Constraint are open, if not then right click on the menu bar and select on the toolbars to open.

Step 2: Turn on Sketch tools> Snap to point, as it is helpful in sketching figure because now the pointer mover node-to node of grid.

Step 3: Turn on Sketch tools> Geometrical constraints, as it help to notify the axis and correspondingly change the dimension of different parts of the object.

Step 4: Select Profile> Rectangle and draw it on the screen. Click one point and then click the diagonal point of the rectangle to create it.

Step 5: Select any one the side line of the rectangle and click on Constraint> Constraint to get the dimension and double click on the dimension to edit it.

*You will notice that the other corresponding side to that side automatically get edited, this is due to the Geometrical Constraint.

Step 6: Similarly select the bottom or upper line to get their dimension and edit if required according to the figure.

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Step 7: Select Operation> Corner, and then select the two adjacent sides of the rectangle from near the corners. Similarly select the other two adjacent sides where we have to create a corner.

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Step 8: Select one of the corner and click on Constraint > Constraint, to get the dimension of arc and edit it according to the given figure. Similarly, edit the other corner.

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Step 9: Select Profile> Circle, draw the circle of given radius on the centres of the arcs. By double clicking you can change the dimension of the circle; also you can switch between diameter and radius by selecting any one of them from the constraint definition dialogue box under dimension option.

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Now to create the given profile in between the object, there are many ways whether you create profile first and then edit dimensions or you first create a rectangle and edit the sides with the curves or corner command. I prefer to take the first option.

Step 10: Select Profile> Profile, and draw a line first, without double clicking or existing the command just press the left mouse button, hold it and drag it in the circular manner to get the circular profile/ curve.

As soon as you keep your pointer (after selecting the profile command) below the center of the curve, it automatically aligns the point with respect to it by highlighting it by blue lines this is due to the geometrical constraint.

Note: For using the Profile command from the profile toolbar, always create a line first. This command doesn't create a curve/ circular profile first.

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Now, edit the dimension and spacing of the section according to the given figure.

Note: For multiple selections select first element than press control and select as many element you want to select. For spacing between the center profile and base line, just select the center point of any one of the arc and base line with multiple selection method.

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Now, edit the length of the center profile. If the figure distorts, then change or edit the relative distances between the elements to correct it.

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This is the required figure.

This tutorial is a very basic one, just to encounter with the basic properties and basic problem of a simple two dimensional figure. Also, this tutorial will help to know the uses of particular commands in the profile toolbar. Similarly other command in this toolbar can also be implemented and the software makes it more user friendly just by providing the simple names to all commands, which makes them easy and efficient.

This is basic workbench as every one knows that two dimensional sketching is the base for all other modeling. So, it's really important to understand it more precisely.

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Comments

sai kumar on 2010-01-29 13:30:33 wrote,

na mudi la vundi raaaaaaaa