How to draw a circle in isometric view

All points of a circle projected on a plane should be parallel to this plane. Since all planes in an isometric projection are inclined, the circle takes the form of an ellipse. To simplify the work of the ellipses in an isometric projection are replaced with ovals.

You will need

• pencil;
• - square or ruler;
• a pair of compasses;
• - protractor.

Instruction

1. The construction of the ellipse in the isometric begins with the definition of the position of its minor and major axes which intersect in the center. Therefore, first determine the position of the center of the circle on the right plane isometric projection. Mark the center of the circle point O.
2. Draw the minor axis of the oval. The minor axis is parallel to the missing in-plane axis isometric projection and passes through the center of the circle O. for Example, in the plane ZY minor axis parallel to the axis X.
3. With the straightedge or ruler with protractor build large axis of the oval. Is it perpendicular to the minor axis of the ellipse and intersects it in the center of the circle O.
4. Guide through the circumcenter O, the two lines parallel to the axes of the plane in which the projection is based.
5. With a compass mark on the small axis of the oval, and on the lines parallel to the axes of the projection at two points opposite from the center of the sides. The distance to each point on all lines is delayed from the center O equal the radius of the projected circle. All you should have 6 points.
6. Label on the small axis of the oval points A and B. Point A is closer to the origin plane than point B. the origin of the plane corresponds to the point of intersection of the axes isometric projection drawing.
7. Label the marked points on the lines parallel to the axes of the projection points C, D, E and F. the Points C and D must appear on the same line. Point C is closer to the origin of the axis of projection, which is parallel to the selected line. Similar rules are valid for the points E and F, which should be located on the second line.
8. Connect the points A and D, as well as point BC line segments, must intersect the large axis of the oval. If the resulting segments do not intersect the great axis, label the point E as point C, and point C as point E. Similarly, change the designation of the point F on D, and points D And F. connect the resulting points A and D, B and C segments.
9. Mark the points where line segments AD and BC intersect the large oval axis as G and H.
10. Set the compass radius equal to the length of the segment CG, and draw the arc between points C and F. the arc Center must be located at the point G. in a Similar way, draw the arc between points D and E.
11. From point A, draw an arc of radius equal to the length of the segment AD between points F and D. in a Similar way, draw the second arc between points C and E. the Construction of the ellipse in the first plane ready.
12. Repeat similarly the construction of the ovals for the rest of the planes isometric projection.