sectional view of a centrifugal pump radial section axial section sectional view of a leaf sectional...
TRANSCRIPT
Sectional view of a centrifugal pump
Radial section
Axial section
Sectional view of a leaf
SECTIONAL VIEWS
TO VIEW FEATURES THAT ARE HIDDEN IN AN UN-SECTIONED
VIEW
Section Plane Section Plane Through ApexThrough Apex
Section PlaneSection PlaneThrough GeneratorsThrough Generators
Section Plane Parallel Section Plane Parallel to end generator.to end generator.
Section Plane Section Plane Parallel to Axis.Parallel to Axis.
TriangleTriangle EllipseEllipse
Para
bola
Para
bola
HyperbolaHyperbola
EllipseEllipse
Cylinder throughCylinder through generators.generators.
Sq. Pyramid through Sq. Pyramid through all slant edgesall slant edges
TrapeziumTrapezium
Typical Section Planes Typical Section Planes &&
Typical Shapes Typical Shapes Of Of
SectionsSections..
ILLUSTRATION SHOWING ILLUSTRATION SHOWING IMPORTANT TERMS IMPORTANT TERMS
IN SECTIONING.IN SECTIONING.
xx yy
SECTION SECTION PLANEPLANETRACETRACE LINE LINE (egde view)(egde view)
SECTION LINESSECTION LINES(45(4500 to axis or outline, to axis or outline,
preferably not parallel to preferably not parallel to an outline)an outline)
Apparent Shape Apparent Shape of sectionof section
SECTIONAL T.V.SECTIONAL T.V.
Direction of viewing for TVDirection of viewing for TV
The section is drawn by projecting the points where the section plane intersects the edges of the solid and joining them
ad
cb
a’, b’
c’, d’
F.V.F.V.
Notations for cutting planes
Ref: Fundamentals of Engg. Drawing, Luzadder
Section plane denoted by different methods Arrows point towards
the remaining part
End point of object
Section more than one component in the same drawing
(e.g. concentric cylinders)
Section lines of adjacent components are drawn in different directions
Section lines for alternate components can be drawn in the same direction but with different spacing between section lines
Sectioning a solid• It is required to see features that are not clear in an
unsectioned view
REF: http://www.tpub.com/content/draftsman/14276/css/14276_190.htm
Usually hidden lines behind the section are not drawn
FRONT VIEW SIDE VIEW SECTIONAL SIDE VIEW
Section plane
Section lines at 45o to adjacent axis, lighter than the outlines
8
Ribs (used for strengthening, positioning)
Rib
Rib not sectioned even though cutting plane passes through it
A
AA A
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Ribs (used for strengthening, positioning)Rib
B
B
B
B
TV
Full FVSectioned SV
Viewing direction
10
Types of sectional views(Used for showing outer and inner features on the same figure)
“It is considered good practice to omit all hidden lines unless such lines are necessary to clarify the representation.”
“Good practice dictates that hidden lines be omitted from both halves of the view unless they are absolutely necessary to explain the object.”
EXAMPLE TAKEN FROM BOOK BY LUZADDER AND DUFF
11
Full section
Offset full section
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Section B-B
Section A-A
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C
C Section A-A
Rib not sectioned
Section B-B
Section C-C
Each section has been drawn separately
Draw orthographic views showing
sections P-P and R-R
Draw orthographic views showing the section indicated