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

Exercise 7-1, 7-2, 7-3

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