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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.