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Off Axis and Off Angle Projection - page 3
Select the Isometric Ellipse you created in the second step (#6). Duplicate it and drag it over to the protractor. Place it on the proper isometric plane by applying a 120 degree rotation using the Transform Roll-up. Drag the result to the proper red radial line (0 degrees) placing it as shown. Select the Node Edit Tool and this ellipse and note that the nodes at the minor axis are parallel to the 0 degree radial. The minor axis nodes will always be parallel to the appropriate radial when projecting along an isometric plane.
Use the Transform Roll-up to apply a horizontal mirror to a duplicate of the ellipse and place the copy on the other side of the protractor. Use the Transform Roll-up to apply a horizontal mirror to a duplicate of the ellipse once more and place that copy on the other side of the protractor. This completes the "on axis" part of the protractor. There should be an isometric ellipse at each intersection of the "0" lines (red) and the ellipse (4). The minor axis nodes should be parallel and on the "0" line.
To develop the major axis ellipse measure the angle of one of the nearly horizontal lines (I use lower left to upper right) by using the straight line pencil tool to draw along that line while watching the status line. Turning on "snap to objects" will make this step easier. The result should be 2.875 degrees. Duplicate a 5 degree ellipse and rotate it 92.875 degrees (90 plus 2.875) and place it along the appropriate major axis. Use the Transform Roll-up to apply a vertical mirror to a duplicate ellipse and position accordingly. Duplicate both of those ellipses and place them along the correct axis.
Establishing Angles:
To develop the minor axis ellipse measure the angle of one of the nearly vertical lines (I use lower left to upper right) by using the straight line pencil tool to draw along that line while watching the status line. Turning on "snap to objects" will make this step easier. The result should be 81.334 degrees. Duplicate a 70 or 80 degree ellipse and rotate it -8.666 degrees (90 minus 81.334) and place it along the appropriate minor axis. Use the Transform Roll-up to apply a horizontal mirror to a duplicate ellipse and position accordingly. Duplicate both of those ellipses and place them along the correct axis.

 

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1997 - 2001 John M. Morris