engineering drawings lecture sectioning
TRANSCRIPT
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Engineering
Drawings:Sectioning
AshortseriesoflecturesonEngineeringDrawingasPartofENGG1960ByPaulBriozzo
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Sectioning
Featuresthatcannotbeseenbyhiddendetail Cuttingplaneremovespartsectioniswhatisleft Crosshatchingisat45o equispaced
Centrelines
often
used
for
cutting
planes Verythinsectionsnothatchede.g.gaskets,seals Donotshowhiddendetailinsectionalview(exceptforspecialfeatures) Webs,Shafts,boltsandpinsareusuallyNOTsectionedeveniftheyarein
thecuttingplane
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Rules
to
Remember
When
Sectioning
A
sectional
view
shows
the
part
of
the
component
in
front
of
the
cutting
planearrows.Inthirdangleprojectionthesectionalviewisplacedonthesidebehindthesectioningviewingplane.
Materialwhichhasbeencutbythecuttingplaneishatched.Standard
exceptionsare
noted
previously.
Asectionalviewmustnothaveanyfulllinesdrawnoverhatchedareas.
Asageneral
rule,
dimensions
are
NOT
inserted
in
hatched
areas.