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Geometric Constructions and Multiview Drawings

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Does not break an object into multiple parts. Places points where ... Based on the ASME Y14.3M, multiview and sectional view drawings. Orthographic Projections ... – PowerPoint PPT presentation

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Title: Geometric Constructions and Multiview Drawings


1
Geometric Constructions and Multiview Drawings
  • Professor Dr. Miguel Alonso Jr.

2
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

3
Parallel Lines and Curves
  • OFFSET command
  • Modify-gtOffset, Offset button, type O
  • Options Through, Erase, Layer, Multiple
  • POINT command
  • Draw-gtPoint, Point button, type PO
  • Point Style Format gtPoint Style

4
Dividing an Object
  • DIVIDE command
  • DrawgtPointgtDivide, 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
  • DrawgtPointgtMeasure, type MEASURE
  • Divides the object according to a measurement at
    specific distances

5
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

6
  • Exercise 7-1, 7-2, 7-3

7
  • 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

8
  • 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

9
  • Select the front view
  • Show hidden features, fig 7-12
  • One view drawings
  • Showing symmetry and circle centers

10
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

11
Construction Lines and Rays
  • XLINE and RAY
  • XLINE extends in both directions, RAY extends in
    one directions
  • XLINE
  • HOR, VER, ANG, BISECT, OFFSET
  • RAY

12
  • Drawing problems
  • 2
  • 4
  • 10
  • 13
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