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A : chassis                                        B : tipper

C : passage of wheel axles               D : fillets

We need to observe the body shapes and answer the following questions :

  1. Does the part have a profile that can be obtained by extrusion ?
  2. Does the piece have one or more planes of symmetry, even incomplete, to make copies by symmetry of all or part of the object ?
  3. Does the part have coaxial shapes, which can be created by revolution of an outline ?
  4. Does the part have identical forms, making it possible to make copies by linear network (translation), circular network (rotation) or partial symmetry with respect to a plane ?

1- Analyze the shapes of the part to be built