Creating the union of the main pipes

1. Choose the option Zoom In from the mouse menu. Magnify the right end of the model.

2. Make sure the "aux" layer is visible.

3. From the Copy window, select Lines and Rotation. Enter an angle of 120 degrees and from the Do extrude menu, select Surfaces. Since the rotation may be done in 2D, choose the option Two Dimensions. The center of the rotation is the tangential center.

Figure 16. The magnified right end of
the model

4. Click Select and select the four lines that define the right end of the pipe. (See Figure 16.) Press ESC when the selection is finished.

Figure 17. Result of the rotation