Arbortext IsoDraw > Tutorials > Drawing Basics Tutorial > Exercises > Finding Angles in a Perspective Plane > Draw in the Bores
  
Draw in the Bores
1. Duplicate the ellipse (4) of the flange bore and set the diameter in the dimensions bar to 68.
This auxiliary ellipse (1) now forms the imaginary ring on which the bores are to be aligned.
2. Select the Line tool from the toolbox.
3. Draw a line (2) through the center of the flange ellipses.
This forms a reference line for the orientation of the flange as per the technical drawing.
4. Select the Ellipse tool from the toolbox.
5. Draw an ellipse (3) with a diameter of 10 at the intersection point of line (2) and ellipse (1).
6. Select the Perspective rotation tool from the toolbox.
The cursor changes into the center cursor.
7. Ellipse (3) is still selected.
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To enable elements to be rotated in perspective, an ellipse is required from the plane. The ellipse (4) of the flange bore is used for this.
8. Holding down the SHIFT key, click on the ellipse (4) of the flange bore.
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By doing this, you have specified in which plane and around which center point the ellipse (3) is to be rotated.
The Rotate dialog box appears.
9. Enter 45 and confirm by clicking Copy.
The new ellipse is now in the 35° plane, rotated through 45°. This matches the orientation of the bore in the technical drawing.
The new ellipse is still selected.
10. Holding down the SHIFT key, click on the ellipse (4) of the flange bore again.
The Rotate dialog box appears.
11. Enter 90 and confirm by clicking Copy.
12. The next ellipse is now in the 35° plane, rotated through 90°. Repeat this process twice to create the ellipses for the two missing bores.
To simplify this repetition, select the Element > Repeat rotate menu command (CTRL+T).
Instead of selecting this command twice, you can also create both ellipses simultaneously by holding down the SHIFT key when clicking the Repeat rotate command.
The following dialog box appears.
13. Enter 2 and confirm by clicking OK.
14. All the bores have now been drawn.
Delete ellipse (1), line (2), and ellipse (3).
15. The drawing of the flange now matches the specifications of the technical drawing and is complete.