Switching back to the Top isoplane, I created the concentric isocircles. To complete the slot, the hole, and the pin, I copied and trimmed everything that didn’t belong. Then, I trimmed the excess lines from the slot and copied the objects as shown. If you’re not already familiar with this powerful feature, definitely try it out! This same method also works great for creating silhouette edges. To connect the isocircles for the slot, I started the Line command and used object snap tracking (F11) as shown below. A convenient way to locate the centers of the holes is to use object snap tracking from the midpoint of an edge together with direct distance entry. Next, I switched to the Left and Right isoplanes and created the isocircle ellipses. Tip: For several of the points, I could have used object snap tracking instead. Then, to draw the vertical lines, I switched to the Right isoplane, entered the distances from points 1 through 4, and then snapped to the endpoint at point 5. After cycling the isoplane to Top, I used direct distance entry to specify the lengths. For this illustration, I started with the top view and worked down. These are not true 3D objects and have no real depth, only the illusion of depth.I'm so excited to have my guest writer, Dieter Schlaepfer, as he continues his coverage of isometric drawing in AutoCAD 2015. One should remember that isometric perspective is only for visualization. However, isometric drawing is inappropriate when precision 3D drawings are required for design, testing, and manufacture. Users need ellipses for the base of the monitor in the upcoming computer desk drawing as well as the power button and extensive end-of-chapter exercises. A circle angled away from users is an ellipse, and these shapes find wide application in isometric drawing. One needs to draw a straight horizontal line and then rotate it 30 degrees counterclockwise. There is nothing inherently special about drawing an isometric design. The reason why one should use isometric perspective instead of 3D is that it is much easier to learn isometric drawing than to develop proficiency in real 3D. By strict definition, isometric perspective means representing a three-dimensional object in two dimensions. This chapter introduces isometric perspective in AutoCAD and how to use it. Elliot Gindis, in Up and Running with AutoCAD 2012: 2D version, 2012 Publisher Summary
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