Embed Size (px)
Citation preview
A pentagonal pyramid 30 mm base sides & 60 mm long axis, is freely suspended from one corner of base so that a plane containing it’s axis remains parallel to VP. Draw it’s three views.
Anna Unive
rsity
Question
on Engin
eerin
g Grap
hics
for Firs
t Yea
r Stu
dents
of
all Bran
ch of E
nginee
ring
solve
d
X Y
Draw XY line as shown
X Y
Draw a line as shown perpendicular to XY line
Draw Pentagon as shown Keeping one edge on the line drawn and name the points
a
b c
d
e
o 30
assuming it standing on HP, draw TV - a regular pentagon, corner as shown
X Y
Draw Projectors as shown
a
b c
d
e
o
X Y
Draw Projector as shown
a
b c
d
e
o
X Y
Draw a line as shown to get height of pyramid 60mm
a
b c
d
e
o60
X Y
a
bc
d
e
o60
a’ b’(e’) c’(d’)
o’ Name the points as shown
X Y
a
bc
d
e
o
a’ b’(e’) c’(d’)
o’ Join the points as shown
X Y
a
bc
d
e
o
a’ b’(e’) c’(d’)
o’
Join the points as shown
Draw a line 1/4 distance of height from base actually it should be 1/3 distance but none of the engineering graphics books corrected this error from the birth of Engineering , the professors who are handling the subjects also may not be knowing , they will say that book has given like that if you do with 1/3 distance you may not get mark
60/4
=15
C.G
X Y
a
bc
d
e
o
a’ b’(e’) c’(d’)
o’Join the centroid and corner points as shown
C.G
X Y
a
bc
d
e
o
a’ b’(e’) c’(d’)
o’
C.G
a’
b’(e’)
c’(d’)
o’
C.G
Transfer the FRONT view keeping line passing through C.G and corner vertical as shown
When a solid is freelysuspended from acorner, then line joining point of contact & C.G. remains vertical.( Here axis shows inclination with HP.)So in all such cases, assume solid standing on HP initially.)
X Y
a
bc
d
e
o
a’ b’(e’) c’(d’)
o’
C.G
a’
b’(e’)
c’(d’)
o’
C.G
Transfer the FRONT view keeping line passing through C.G and corner vertical as shown
X Y
a
bc
d
e
o
a’ b’(e’) c’(d’)
o’
C.G
a’
b’(e’)
c’(d’)
o’
C.G
Draw Projectors as shown
X Y
a
bc
d
e
o
a’ b’(e’) c’(d’)
o’
C.G
a1’
b1’(e1’)
c1’(d1’)
o1’
C.G
c1
d1
b1
a1
e1
o1
Draw Projectors as shown
X Y
a
bc
d
e
o
a’ b’(e’) c’(d’)
o’
C.GC.G
a1’
b1’(e1’)
c1’(d1’)
o1’
c1
d1
b1
a1
e1
o1
Join the points as shown
X Y
a
bc
d
e
o
a’ b’(e’) c’(d’)
o’
C.GC.G
a1’
b1’(e1’)
c1’(d1’)
o1’
c1
d1
b1
a1
e1
o1
TOP VIEW
FRONT VIEW
ALL DIMENSIONS ARE IN mmSCALE 1:1
VP
HP
