EG UNIT-II PROJECTION OF POINTS.ppt

VERY USEFUL

1. GE 8152 -ENGINEERING GRAPHICS
Dr.R.Ganesamoorthy.
Professor / Mechanical Engineering.
Chennai Institute of Technology.
GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
UNIT-II PROJECTION OF POINTS

2. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
What is Projections:
Whenyouthroughthelightonanobjectatanyangle,thentheimage
isformedoftheobjectonreferenceplanes,thatimageiscalled
Projection.
Objectives-ProjectionofPoints

3. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
Objectives-ProjectionofPoints:
Todrawtheprojectionsofapointinthefourquadrants.
Toidentifythepositionofthepointindifferentquadrants.

4. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
CoordinateSystem:

5. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
Defineprojectionofpoints:
Thepositionofapointinengineeringdrawingisdefinedwithrespecttoits
distancefromthethreeprincipleplanesi.e.,withrespecttotheVP,HP,&PP.
VP:Theplaneinfrontofobserveristheverticalplane.(VP)oritisalso
calledaFrontalplane.
HP:TheplanewhichisHorizontalandperpendiculartoVPisHorizontal
Plane.
Note:TheplanesHPandVParecalledPrincipalPlanes.
ReferenceLine:ThelineofintersectionofHPandVPiscalledreferenceline,
whichisdenotedbyX-Y

6. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
Typesofviews:
FrontView(FV):TheprojectionontheVPiscalledtheFront
View(FV)orVerticalProjectionorfrontelevation
TopView(TV):TheprojectionontheHPiscalledtheTopView(TV)
orHorizontalProjectionorPlan.OrElevation.
SideView:Theprojectiononthesidefromtheobjectiscalledthe
sideviews.
Sideviewsisclassifiedinto
1.Left side view and (LSV)
2. Right side view(RSV)

7. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
Positionofpoints:
First quadrant --Above HP & in front of VP
Second quadrant --Above HP & behind VP
Third quadrant --Below HP & behind VP
Fourth quadrant --Below HP & in front of VP

8. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
ORIENTATION OF POINT IN SPACE:
(1) In quadrant I (Above H.P & In Front of V.P.)
(2)In quadrant II (Above H.P & Behind V.P.)
(3)In quadrant III (Below H.P & Behind V.P.)
(4)In quadrant IV (Below H.P & In Front of V.P.)
(5)In Plane (Above H.P. & In V.P.)
(6)In Plane (Below H.P. & In V.P.)
(7)In Plane ( In H.P. & In front of V.P.)
(8)In Plane ( In H.P. & Behind V.P.)
(9)In Plane ( In H.P. & V.P.)

9. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
Notations of point in views :
Following notations should be followed while naming different views in
orthographic projections.
Object Point
It’s top view a
It’s front view a’
It’s side view a’’

10. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
Projection of Points in Different Quadrants:

11. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
Projection of Points : Above HP and In front of VP

12. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
Projection of Points : Above HP and Behind VP

13. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
Projection of Points : Below HP and Behind VP

14. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
Projection of Points : Below HP and In front VP

15. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
Projection of Points : Above HP and on VP

16. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
Projection of Points : Below HP and on VP

17. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
Projection of Points : In HP and In front of VP

18. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
Projection of Points : In HP and Behind VP

19. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
Projection of Points : In HP and In VP

20. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
Projection of Points in Different Quadrants:
1. Point E is in HP and h distance in front of VP
2. Point F is in VP and d distance above HP
3. Point G is in both HP and VP
4. Point H is in HP and d distance behind VP
5. Point J is in VP and h distance below HP

21. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
Projection of Points in Different Quadrants:
1. Point A is in 15 mm above HP and 20 mm in front of VP. Draw its projections.

22. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
Projection of Points in Different Quadrants:
2. Point B is lying on HP and 30 mm in front of VP. Draw its projections.

23. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
Projection of Points in Different Quadrants:
3. Point C which is lying on the VP and 25 mm above HP. Draw its projections.

24. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
Projection of Points in Different Quadrants:
4. Point Q is in 20 mm below HP and on the VP. Draw its projections.

25. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
Projection of Points in Different Quadrants:
5. Draw its projections of a Point B which is 10 mm below HP and 40 mm in front of VP.

26. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
Projection of Points in Different Quadrants:
6. Mark the projection of the following points on a common reference line. Take 30 mm distance between
the projectors.
1.A 20 mm above HP and 15 mm in front of VP 2.B 20 mm above HP and 30 mm behind VP
3.C 10 mm below HP and 35 mm behind VP 4.D 10 mm below HP and 20 mm in front of VP
5.E 20 mm above HP and in VP 6.F 15 mm below HP and in VP
7.G 8 mm in front of VP and in HP 8.H 18 mm behind VP and in HP

27. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
Projection of Points in Different Quadrants:
7. Mention the position of the following points with respect to the planes of Projections. All dimensions
are marked in mm
1.Point A 20 mm above HP and 30 mm behind of VP 2.Point B 20 mm below HP and 25 mm in front of VP
3.Point C 25 mm below HP and 30 mm behind VP 4.Point D 30 mm below HP and in VP
5.Point E 25 mm above HP and 20 mm in front of VP

28. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
Projection of Points in Different Quadrants:
8. A Point C is on HP and 30 mm behind VP. Another point D is also on HP and 40 mm in front of VP. The
distance between their projectors is 50 mm. join their top views and determine the inclination of this line
with XY line.

29. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
Projection of Points in Different Quadrants:
9.A point P is on HP and 40 mm in front of VP. Another point Q is also on HP and behind VP. The distance
between their end projectors is 60 mm .Draw its projections if the top view line joining P and Q makes on
angle of 60°with reference line .and also find the position of Q.

30. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
Projection of Points in Different Quadrants:
10. Point P is lying in the third quadrant is situated 20 mm below the below the HP. Its shortest distance
from the line of intersection of planes is 40 mm. Draw its projections and find the distance of the point
from the VP.

31. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
Projection of Points in Different Quadrants:
11.Point A is 20 mm above HP and in the first quadrant. Its Shortest distance from the reference line XY is
40 mm.Draw the projections of the point and determine its distance from VP .
Answer: Distance from VP= 40mm

32. GE8152-ENGINEERING GRAPHICS UNIT-II PROJECTION OF POINTS
Projection of Points in Different Quadrants:
12.Draw the projections of the following points on a common reference. Take 30 mm distance between the
projectors.
1.Point A 35 mm above HP and 25 mm in front of VP 2.Point B 40 mm below HP and 15 mm behind VP
3.Point C 50 mm above HP and 25 mm behind VP 4.Point D 45 mm below HP and 25 mm behind VP
5.Point E 30 mm behind VP and on HP

33. GE8152-ENGINEERING GRAPHICS -UNIT-II PROJECTION OF POINTS
Thank you