Isometric sketching circles

Sketching Isometric Circles, Arcs, and Cylinder Circles and arcs look like ellipses when they are sketched in isometric. Simply put, an ellipse is a flattened circle that is developed with two equal large arcs and two equal smaller arcs. The easiest way to begin an isometric circle or arc is to begin with an isometric square. The circle or arc will appear shghtly different in each view (front, top, and side) of the isometric shape. Figure 5-13 illustrates the steps to sketch each isometric circle. An arc, as you may recall from Chapter 4, is a segment or part of a circle. So, if you learn to sketch isometric circles, you also learn to sketch isometric arcs. 

Sketching isometric cylinders is the natural next step once you have learned to sketch isometric circles. Cylinders are sohds with the ends shaped like circles. When you sketch the two opposite isometric circles, all you wiU need to do is connect the circles with two lines (edges of the cylinder) tangent to the circles (remember, tangent line was defined in Chapter 4). Examine Figure 5-14 to see the steps you need to take to sketch isometric cylinders from the front, side, and top views. 

Sketching Isometric Holes Isometric holes can be thought of as negative cylinders. You can sketch an isometric hole in the same way you sketch an isometric cylinder. Instead of the cylinder being of solid material, it forms empty space. Figure 5-15 demonstrates how to sketch an isometric hole. If the length (also called depth) of the hole is less than the diameter of the circle, then you will be able to see part of the other end of the hole. However, if the depth is longer (deeper) than the diameter, you wUl not be able to see the end of the hole. 

Sketching Complex Objects in Isometric So far you have learned to sketch simple isometric shapes such as rectangular solids, circles, arcs, and cylinders. You also learned to sketch inclined planes, or planes that are not perpendicular to the six normal planes (front, right side, top, left side, back, and bottom). Now you will take what you have learned and combine shapes to create recognizable objects. 

Sketching one-point perspective circles, arcs, and holes is similar to sketching in isometric. Begin by developing a perspective square. Unlike isometric squares, for which all sides are equal, the height of the square is... 

Using correct freehand technical sketching techniques, practice sketching isometric circles. See Figure 5-33 for a practical example. 

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