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Geometric Construction Modeling Basics

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Geometric Construction Modeling Basics

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    1. Geometric Construction & Modeling Basics

    2. Points A point represents a location in space or on a drawing. It has no width, height or depth. Sketch points by a short crossbar on a line, or by a small cross.

    3. Lines A straight line is the shortest distance between two points. Parallel lines Intersecting lines Perpendicular lines

    4. Polygons A polygon is any plane figure bounded by straight lines.

    5. Regular Polygons Regular polygons have equal angles and equal sides. They are often created and described by inscribing them in a circle, or circumscribing them about a circle. Hex head bolts are a typical example

    6. Circles A circle is a closed curve, all points of which are equally distant from the center. Circumference equals pi times the diameter C = p d

    7. Solids

    8. Extruded Solid CAD construction for a 3D part having a uniform cross section. Named for the manufacturing process of forming material by forcing it through a shaped opening.

    9. Revolved Solid construction by revolving a uniform cross-section along a circular path.

    10. Boolean Operators Venn diagrams can be used to show Boolean operations. Union (addition) Difference (subtraction) Intersection

    11. Boolean Operations of Solids

    12. Summary Points, lines, and circles are the basic geometric elements used to make 2D sketches. Using CAD you can create 3D models. Understanding geometric solids can help you create CAD models and interpret and visualize from 2D sketches and drawings.

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