Geometric Drawing- Construction Download: http://skillcruise.com/academics/mechanical-engineering/engineering-drawing/

1. Geometric Construction, OrthographicGeometric Construction, Orthographic
Projection & Isometric ProjectionProjection & Isometric Projection
Geometric Construction, OrthographicGeometric Construction, Orthographic
Projection & Isometric ProjectionProjection & Isometric Projection

2. TopicsTopics
• Geometric ConstructionGeometric Construction
• Orthographic ProjectionOrthographic Projection
• Isometric ProjectionIsometric Projection

3. Geometric ConstructionGeometric Construction
• Construction of primitive geometric forms (points, lines and planes etc.)
that serve as the building blocks for more complicated geometric
shapes.

4. Geometric ConstructionGeometric Construction
a. Point :
- Non dimensional geometrical element.
- Occurred by interception of various lines.

5. Geometric ConstructionGeometric Construction
b. Line :
One dimension geometrical element occurred by moving of a point in various
direction.

6. Geometric ConstructionGeometric Construction
c. Plane:
-Occurred by at least three
points or connection of one
point and one line.
-A plane is always 2D
-When the number of element
forming a plane increases,
shape and name will change.

7. Geometric ConstructionGeometric Construction

8. Relationship of One Line to Another Line or ArcRelationship of One Line to Another Line or Arc

9. Bisecting a LineBisecting a Line

10. Dividing a Line into Equal PartsDividing a Line into Equal Parts

11. Orthographic ProjectionOrthographic Projection
• Reference: Technical
Graphics
• Advantage—Represent
features of an object
more accurately

12. Orthographic ProjectionOrthographic Projection
• Orthographic projections are a collection of 2D drawings
that work together to give an accurate overall
representation of an object.

13. Orthographic ProjectionOrthographic Projection

14. Projection DrawingProjection Drawing
• Isometric projection is a method for visually representing
three-dimensional objects in two dimensions in technical
and engineering drawing.

15. Multi-view Projection, The Glass BoxMulti-view Projection, The Glass Box
• Placing parallel planes to the principal
planes forms a glass box (always observed
from outside the box)
• To show views of a 3D object on 2D piece
of paper, it is necessary to unfold the
planes such that they lie in the same plane
• All planes except the rear plane are
hinged to the frontal plane, which is hinge
to the left-side plane.

16. Multi-view Projection, The Glass BoxMulti-view Projection, The Glass Box

17. Multi-view Projection, The Glass BoxMulti-view Projection, The Glass Box

18. Multi-view Projection, The Glass BoxMulti-view Projection, The Glass Box

19. Multi-view Projection, The Glass BoxMulti-view Projection, The Glass Box

20. Multi-view Projection, The Glass BoxMulti-view Projection, The Glass Box

21. Multi-view Projection, The Glass BoxMulti-view Projection, The Glass Box

22. Which Views to Present?Which Views to Present?
• General guidelines
• Pick a Front View that contain the most information that describe the object
• Normally the longest dimension is chosen as the width (or depth)
• Most common combination of views are:
• Front, top and side view
• Any other view that is different from the principal views is called an Auxiliary
View

23. Minimum Drawing ViewMinimum Drawing View
• 3 view
• 2 view

24. Projection AngleProjection Angle
Projection Symbol
First Angle European
Third Angle American

25. Projection AngleProjection Angle

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