Modelação tridimensional EXC 17

Exc 17:
download file at:

http://gaudi.fa.utl.pt/~20108209/17 exc.3dm

open model from 02 excercise:

Command:  l
Command:  line

Command:  Offset

Curve offset into one closed curve.
Command:  co
Command:  copy
Command:  _Sphere
Creating meshes... Press Esc to cancel
1 surface, 16 curves added to selection.
Command:  co
Command:  copy

32 curves, 2 surfaces added to selection.
Command:  co
Command:  copy
Command:  _Rotate
16 curves, 1 surface added to selection.
Command:  _Rotate
2 surfaces, 32 curves added to selection.
Command:  co
Command:  copy
1 surface, 16 curves added to selection.
Command:  co
Command:  copy

Command:  mi
Command:  mirror
Command:  mi
Command:  mirror
14 curves, 1 surface added to selection.
Command:  co
Command:  copy

Command:  M
Command:  _Move

Command:  '_SynchronizeViews
21 surfaces, 96 curves added to selection.
Command:  M
Command:  _Move
4 surfaces added to selection.
Command:  Rotate3D
Command:  Rotate3D

5 surfaces added to selection.
Command:  Rotate3D
6 surfaces added to selection.
Command:  Rotate3D
Command:  _Undo
Undoing Rotate3D
Command:  Rotate3D
Command:  Rotate3D
2 surfaces added to selection.
Command:  Rotate3D
Command:  Rotate3D
3 surfaces added to selection.
Command:  Rotate3D
24 curves, 57 surfaces added to selection.
Command:  M
Command:  _Move

9 surfaces, 4 curves added to selection.
9 surfaces added to selection.
Command:  Rotate3D
10 surfaces added to selection.

Command:  _BooleanDifference