mechanical engineering graphicsnrskumar/index_files/mech211/full... · engineering graphics mech...
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bF
aF
aH
bH
cF
A line (RS) intersecting a
plane (ABC) has a common
point to that plane (J)
cH
rF
rH
sF
sH
jH
jF
Line intersecting a plane If the line is not parallel to the plane, it should intersect the plane
and the common point is called the piercing point
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Intersection of line with plane – EV Edge View Method to see piercing points
bF
aF
aH
bH
cF
cH
H
F
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Intersection of line with plane – EV Edge View Method to see piercing points
bF
aF
aH
bH
cF
cH
H
F
pH qH
pF
qF
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Intersection of line with plane – EV Edge View Method to see piercing points
mF
bF
aF
nF
mH
aH
nH
bH
cF
cHTL cA
aA
E.V
.
H
F
H A
pH qH
pF
qF
qA
pA
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mF
bF
aF
nF
mH
aH
nH
bH
cF
cHTL cA
aA
E.V
.
H
F
H A
pH qH
pF
qF
qA
pA
jH
jF
jA
Intersection of line with plane – EV Edge View Method to see piercing points
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Intersection of line with plane – EV Cutting Plane Method to see piercing points
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Intersection of line with plane – CP Cutting Plane Method to see piercing points
bF
aF
rF
aH
rH
bH
sF
cF
A line (RS) intersecting a
plane (ABC) must have a
common point to that plane
sH
cH
H
F
![Page 8: MECHANICAL ENGINEERING GRAPHICSnrskumar/Index_files/Mech211/Full... · ENGINEERING GRAPHICS MECH 211 LECTURE #7 •Polyhedrons and curved surfaces – discussion •Intersection of](https://reader034.vdocuments.mx/reader034/viewer/2022042807/5f8117cd6a866974b10a3a66/html5/thumbnails/8.jpg)
Intersection of line with plane – CP Cutting Plane Method to see piercing points
• If a CP with line RS
is introduced to cut
abc, the line RS will
intersect at piercing
point with abc
bF
aF
rF
aH
rH
bH
sF
cF
A line (RS) intersecting a
plane (ABC) must have a
common point to that plane
sH
cH
H
F
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Intersection of line with plane – CP Cutting Plane Method to see piercing points •Line RS is in
the since the EV
of CP coincides
RS
• If the two lines
are in a plane
and if they are
not parallel,
they must
intersect in the
plane
bF
aF
rF
aH
rH
bH
sF
cF
A line (RS) intersecting a
plane (ABC) must have a
common point to that plane
sH
cH
pH
qH
qF
pF
H
F
add a cutting plane whose
edge view conincides with
line RS in the top view
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Intersection of line with plane – CP Cutting Plane Method to see piercing points
bF
aF
aH
bH
cF
cH
pH
qH
qF
pF
H
FrF
rH
sF
sHadd a cutting plane whose
edge view conincides with
line RS in the top view
the point of intersection between the
line RS and the projection of the CP in
the front view will give the common
point between the line RS and the
plane abc. The point J is the piercing
point
A line (RS) intersecting a
plane (ABC) must have a
common point to that plane
jH
jF
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Intersection of line with plane – CP Cutting Plane Method to see piercing points
Rule of Visibility
• Information about visibility is collected in adjacent view
• Point 5 on edge 1-3 is nearer to the observer. So edge 1-3 is visible in view B
• Point 7 on edge 1-3 is nearer to the observer. So edge 1-3 is visible in view A
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Intersection of line with plane – CP Cutting Plane Method to see piercing points
bF
aF
rF
aH
rH
bH
sF
cF
A line (RS) intersecting a
plane (ABC) must have a
common point to that plane
sH
cHjH
jF
pH
qH
qF
pF
H
F
add a cutting plane whose
edge view conincides with
line RS in the top view
The corner or edge of the object nearest to
the observer will be visible.
The corner or edge fartherest from the
observer will usually be hidden if it lies
within the outline of the view.
Information about the visibility in a view
will be collected in any adjacent view.
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Intersection of two planes - EV Edge View Method
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Intersection of two planes - EV Edge View Method
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Intersection of two planes - EV Edge View Method
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Intersection of two planes - EV Edge View Method
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Intersection of two planes - EV Edge View Method
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Intersection of two planes - EV Edge View Method
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Intersection of two planes - EV Edge View Method
•The line must
intersect or be
parallel to the lines
in the plane
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Intersection of two planes – CP Cutting Plane Method
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Intersection of two planes – CP Cutting Plane Method
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Intersection of two planes – CP Cutting Plane Method
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Intersection of two planes – CP Cutting Plane Method
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Intersection of two planes – CP Cutting Plane Method
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Intersection of two planes – CP Cutting Plane Method
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Intersection of two planes – CP Cutting Plane Method
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MECHANICAL
ENGINEERING GRAPHICS
MECH 211
LECTURE #7
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• Polyhedrons and curved surfaces – discussion
• Intersection of a plane with a polyhedron –
visibility
• Intersection of a line with a polyhedron –
visibility
• Location of a plane perpendicular to a line
through a point
• Projection of a point to a plane
• Intersection of a line with a cone
• Intersection of a cylinder with a plane
• Intersection of two prisms
• Intersection of two cylinders
Content of the Lecture
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Polyhedrons and curved surfaces
• Surface is 2D. It has area, no volume
– Surface is generated by moving a line (straight or
curved). This is called generatrix
– Every position of this generatrix is called the element of
the surface
• Divided as Ruled and Double Curved Surfaces
– Ruled Surface – Generated by moving straight lines
• Plane Surfaces – Polyhedrons
• Single Curved surfaces – Cylinders or Cones
• Warped Surfaces – adjacent lines are skewed lines (Hyperboloid)
– Double curved surface - generated by moving curved
lines (Sphere, Torus, ellipsoid)
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Polyhedrons and curved surfaces
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Polyhedrons and curved surfaces
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Intersection of plane and polyhedron
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Intersection of plane and polyhedron
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Intersection of plane and polyhedron
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Intersection of plane and polyhedron
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Intersection of plane and polyhedron
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Intersection of plane and polyhedron
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Intersection of plane and polyhedron
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Intersection of plane and polyhedron
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Intersection of plane and polyhedron
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Intersection of plane and polyhedron
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Intersection of plane and polyhedron
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Intersection of plane and polyhedron
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Intersection of plane and polyhedron
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Intersection of plane and polyhedron
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Intersection of plane and polyhedron
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Intersection of line with polyhedron
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Intersection of line with polyhedron
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Intersection of line with polyhedron
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Intersection of line with polyhedron
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Intersection of line with polyhedron
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HF
aF
eF
iF
iH
aH
eH
bA
bH
Through the points I and E respectively draw planes
that are perpendicular to line AB
Location of a Plane perpendicular to a line through a point
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HF
aF
eF
iF
iH
aH
eH
bA
bH
Through the points I and E respectively draw planes
that are perpendicular to line AB
I belongs AB, E does not belong AB
Location of a Plane perpendicular to a line through a point
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HF
aF
eF
iF
iH
aH
eH
bA
bH
Through the points I and E respectively draw planes
that are perpendicular to line AB
Draw lines perpendicular to line ab from point I in
both FV and TV
I belongs AB, E does not belong AB
Location of a Plane perpendicular to a line through a point
![Page 55: MECHANICAL ENGINEERING GRAPHICSnrskumar/Index_files/Mech211/Full... · ENGINEERING GRAPHICS MECH 211 LECTURE #7 •Polyhedrons and curved surfaces – discussion •Intersection of](https://reader034.vdocuments.mx/reader034/viewer/2022042807/5f8117cd6a866974b10a3a66/html5/thumbnails/55.jpg)
HF
aF
eF
iF
iH
aH
eH
bA
bH
Through the points I and E respectively draw planes
that are perpendicular to line AB
Draw lines perpendicular to line ab from point I in
both FV and TV
Perpendicular line must be a TL line. so to make it true
length the projection in the adjacent view needs to be
parallel to the folding line.
I belongs AB, E does not belong AB
Location of a Plane perpendicular to a line through a point
![Page 56: MECHANICAL ENGINEERING GRAPHICSnrskumar/Index_files/Mech211/Full... · ENGINEERING GRAPHICS MECH 211 LECTURE #7 •Polyhedrons and curved surfaces – discussion •Intersection of](https://reader034.vdocuments.mx/reader034/viewer/2022042807/5f8117cd6a866974b10a3a66/html5/thumbnails/56.jpg)
HF
aF
eF
iF
iH
aH
eH
bA
bH
Through the points I and E respectively draw planes
that are perpendicular to line AB
Draw lines perpendicular to line ab from point I in
both FV and TV
Perpendicular line must be a TL line. so to make it true
length the projection in the adjacent view needs to be
parallel to the folding line.
Complete the plane based on the points obtained
I belongs AB, E does not belong AB
Location of a Plane perpendicular to a line through a point
![Page 57: MECHANICAL ENGINEERING GRAPHICSnrskumar/Index_files/Mech211/Full... · ENGINEERING GRAPHICS MECH 211 LECTURE #7 •Polyhedrons and curved surfaces – discussion •Intersection of](https://reader034.vdocuments.mx/reader034/viewer/2022042807/5f8117cd6a866974b10a3a66/html5/thumbnails/57.jpg)
HF
aF
eF
iF
iH
aH
eH
bA
bH
Through the points I and E respectively draw planes
that are perpendicular to line AB
Draw lines perpendicular to line ab from point I in
both FV and TV
Perpendicular line must be a TL line. so to make it true
length the projection in the adjacent view needs to be
parallel to the folding line.
Complete the plane based on the points obtained
Draw lines perpendicular to line ab from point e in
both FV and TV
I belongs AB, E does not belong AB
Location of a Plane perpendicular to a line through a point
![Page 58: MECHANICAL ENGINEERING GRAPHICSnrskumar/Index_files/Mech211/Full... · ENGINEERING GRAPHICS MECH 211 LECTURE #7 •Polyhedrons and curved surfaces – discussion •Intersection of](https://reader034.vdocuments.mx/reader034/viewer/2022042807/5f8117cd6a866974b10a3a66/html5/thumbnails/58.jpg)
HF
aF
aH
bA
bH
eH
iH
iF
eF
Perpendicular line must be a TL line. so to make it true
length the projection in the adjacent view needs to be
parallel to the folding line.
Complete the plane based on the points obtained
Draw lines perpendicular to line ab from point e in
both FV and TV
Draw lines perpendicular to line ab from point I in
both FV and TV
Through the points I and E respectively draw planes
that are perpendicular to line AB
I belongs AB, E does not belong AB
Perpendicular line must be a TL line. so to make it true
length the projection in the adjacent view needs to be
parallel to the folding line.
Complete the plane based on the points obtained
Location of a Plane perpendicular to a line through a point
![Page 59: MECHANICAL ENGINEERING GRAPHICSnrskumar/Index_files/Mech211/Full... · ENGINEERING GRAPHICS MECH 211 LECTURE #7 •Polyhedrons and curved surfaces – discussion •Intersection of](https://reader034.vdocuments.mx/reader034/viewer/2022042807/5f8117cd6a866974b10a3a66/html5/thumbnails/59.jpg)
Projection of a Point to a Plane
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Projection of a Point to a Plane
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Projection of a Point to a Plane
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Projection of a Point to a Plane
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Projection of a Point to a Plane
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Projection of a Point to a Plane
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Projection of a Line on a Plane
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Projection of a Line on a Plane
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Projection of a Line on a Plane
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Projection of a Line on a Plane
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Projection of a Line on a Plane
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Projection of a Line on a Plane
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Projection of a Line on a Plane
![Page 72: MECHANICAL ENGINEERING GRAPHICSnrskumar/Index_files/Mech211/Full... · ENGINEERING GRAPHICS MECH 211 LECTURE #7 •Polyhedrons and curved surfaces – discussion •Intersection of](https://reader034.vdocuments.mx/reader034/viewer/2022042807/5f8117cd6a866974b10a3a66/html5/thumbnails/72.jpg)
Single curved surfaces Location of a point on a Cone/Cylinder
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Single curved surfaces Location of a point on a Cone/Cylinder
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Single curved surfaces Location of a point on a Cone/Cylinder
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Single curved surfaces Location of a point on a Cone/Cylinder
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Single curved surfaces Location of a point on a Cone/Cylinder
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Intersection of Line with Cylinder
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Intersection of Line with Cylinder
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Intersection of Line with Cylinder
![Page 80: MECHANICAL ENGINEERING GRAPHICSnrskumar/Index_files/Mech211/Full... · ENGINEERING GRAPHICS MECH 211 LECTURE #7 •Polyhedrons and curved surfaces – discussion •Intersection of](https://reader034.vdocuments.mx/reader034/viewer/2022042807/5f8117cd6a866974b10a3a66/html5/thumbnails/80.jpg)
Intersection of Line with Cylinder
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Intersection of Line with Cylinder
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Intersection of Line with Cone
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Intersection of Line with Cone
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Intersection of Line with Cone
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Intersection of Line with Cone
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Intersection of Line with Cone
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Intersection of Line with Cone
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Intersection of Plane with Cone/Cylinder
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Intersection of Plane with Cone/Cylinder
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Intersection of Plane with Cone/Cylinder
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Intersection of Plane with Cone/Cylinder
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Intersection of Plane with Cone/Cylinder
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Intersection of Plane with Cone/Cylinder
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Intersection of Plane with Cone/Cylinder
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Intersection of Plane with Cone/Cylinder
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Intersection of two Prisms
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Intersection of two Prisms
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Intersection of two Prisms
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Intersection of two Prisms
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Intersection of two Prisms
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Intersection of two Prisms
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Intersection of two Prisms
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Intersection of two Prisms
Cutting plane
method
The problem
shows one
vertical and one
inclined prism,
we must find
the intersection
figures
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Intersection of two Prisms
The CP is chosen
across one edge
RS of the prism
This plane cuts the
lower surface at VT,
and the other prism
at AB and CD
The 4 points WZYX
line in both the
prisms and also on
the cutting plane
These are the points
of intersection
required
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Intersection of two Prisms
The cutting plane
shown in multi
view projection.
The visibility of
the points are
seen in the 3D
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Intersection of two Prisms
Total number of
cutting planes
required is 6 and
locate the
intersection
points from the
cutting planes
and locate the
points in the front
view
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Intersection of two Prisms
The points are
connected in the
front view based
on the visibility
and sequence
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Intersection of two Prisms
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