Mechanical Engineering Drawing MECH 211 LECTURE 3 Contents of the lecture • Shape description • Shape generation • Sectional views • Auxiliary views Shape description • Geometric shapes are seen according to view they are regarded • Set of primitives – used to conceptualize the complex shapes by adding/subtracting the primitive shapes • Primitive shapes: • Boxes Cylinders • Prisms Cones • Pyramids/truncated pyramids Spheres Primitives Primitives – shape generation Boolean operations • Given two shapes, they could be intersected or reunited to obtain a new shape Boolean union • The common part is removed once Boolean difference • The initial shape minus the common portion will be yielded – notice the difference A-B versus B-A Boolean intersection • The intersection means the common portion of the two intersecting bodies Another example