CREATING THE AUXILIARY LINES

The auxiliary lines used in this project are those that make it possible to determine the center of rotation and the tangential center, which will be used later to create the model.

Creating the axes

1. Choose the option Line, which is located in Geometry Create Line.
2. Enter the coordinate (0, 0) on the command line.
3. Enter the coordinate (200, 0) on the command line.
4. Press ESC to indicate that the process of creating the line is finished.
5. Again, choose Line. Draw a line between points (0, 25) and (200, 25). The result is shown in Figure 2.

Figure 2

6. Go to the Copy window (Figure 4), which is found in UtilitiesCopy.
7. Choose Rotation from the Transformation menu and Lines from the Entities Type menu.
8. Enter an angle of -60 degrees and click on Two dimensions.

Enter point (200, 0, 0) in First Point. This is the point that defines the center of rotation. Click Select to select the first line to be drawn. After making the selection, press ESC (or Finish in the Move window) to indicate that the selection of lines to rotate is finished. The result is shown in Figure 3. Figure 3. Creating the axes | Figure 4. The Copy window