Basic CATIA Tutorial For Beginners with Background & History Welcome back. In this next article in my CATIA training for beginner’s series, we're going through some of the basics to help you get working in this great software right away. In the Sketcher Workbench, you'll be creating and editing 3D geometry. Here's where you do things like place points and circles, and draw lines, rectangles, arcs, ellipses, polygons and all sorts of two and three dimensional entities. You also create constraints between the geometric entities, so that they become fixed in space. The constraints are what allow for more precise positioning of your geometry, and hence more stable manufacturing of your parts! To enter the Sketcher Workbench and create a sketch, go to Start > Mechanical Design > Sketcher (select Sketcher from the menu bar). Now, click the Sketcher icon, and then choose a reference plan where you'll be sketching your geometry. (In a 2D sketch, you can only sketch on only 1 plane at a time. These are usually the top plane, the front plane and the right plane. You can select your plane in the graphic area, or you can select from the specification tree on the left of the screen. Alternatively, you can select a planar surface on which to sketch, such as one of the flat faces of your solid, right in the graphic area.
What all this does is create a simple sketch, for which we don't specify the origin and orientation of the absolute axis. Editing a sketch is just as easy: you can just double-click
the sketch or an element of the sketch geometry. Or you can select it in the graphic area or in the specification tree. You can also right click the sketch in the specification tree and then select Move to [sketch name] object in the contextual menu. Select Edit. If you want to create a positioned sketch (rather than a simple sketch), you would doubleclick the sketch either in the tree or in the graphic area. Then click 3D, and right-click the sketch in the specification tree. Select Move to [sketch name] object in the specification tree, and select Edit. So, what's different about a positioned sketch is that we can decide the reference plane, the origin and the orientation of the absolute axis. What's useful about this is that we can define and later change the position of the sketch absolute axis.
There are a few other advantages of the positioned sketch: we can use the absolute axis directions as external references for the sketched profile geometry. A positioned sketch also assures associatively with the 3D geometry. Next, let's click the down arrow that's beside the sketcher icon. Select the Sketch with Absolute Axis Definition icon. You'll see the Sketch Positioning dialog box. This concludes this article about beginning your work in the Sketcher Workbench, in our CATIA training for beginner’s series.
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