Geometric Constructions and Multiview Drawings. Professor: Dr. Miguel Alonso Jr. Outline. Drawing Parallel Lines and Curves Drawing Points Dividing an Object Marking an Object at Specified Distances Orthographic Multiview Drawings Drawing Auxilary Views Construction Lines and Rays.
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Geometric Constructions and Multiview Drawings Professor: Dr. Miguel Alonso Jr.
Outline • Drawing Parallel Lines and Curves • Drawing Points • Dividing an Object • Marking an Object at Specified Distances • Orthographic Multiview Drawings • Drawing Auxilary Views • Construction Lines and Rays
Parallel Lines and Curves • OFFSET command • Modify->Offset, Offset button, type O • Options: Through, Erase, Layer, Multiple • POINT command • Draw->Point, Point button, type PO • Point Style: Format >Point Style
Dividing an Object • DIVIDE command • Draw>Point>Divide, type DIVIDE • Does not break an object into multiple parts • Places points where the breaks would occur • Block option, will be discussed later • MEASURE command • Draw>Point>Measure, type MEASURE • Divides the object according to a measurement at specific distances
Orthographic Multiview Drawings • Each field of drafting has its own method to present views of a product • Architecture • Plan views, exterior views, sections • Electronics • symbols • Civil • Contour lines • Mechanical • Multiview
Focus on multiview • Based on the ASME Y14.3M, multiview and sectional view drawings • Orthographic Projections • Project object features onto an imaginary projection plane • Projection plane is placed parallel to the object and perpendicular to the line of sight • See fig 7-9
Six two dimensional views show all sides of an object, fig 7-10 • Imagine a cube enclosing the object, each view is made as if you were looking through each side of the cube • Front view is primary and placed in the center • Other views are placed surrounding the center view • Use only enough views to completely describe the object
Select the front view • Show hidden features, fig 7-12 • One view drawings • Showing symmetry and circle centers
Auxiliary Views and UCS • Auxiliary view is needed when a surface on the object is at an angle to the line of sight • Slanted surface is forshortened, fig 7-15 and 7-16 • UCS-user coordinate system • UCS toolbar, create new and save
Construction Lines and Rays • XLINE and RAY • XLINE extends in both directions, RAY extends in one directions • XLINE • HOR, VER, ANG, BISECT, OFFSET • RAY
Drawing problems • 2 • 4 • 10 • 13