Basics of Isometric Views and drawings in EG

Basics of Isometric Drawing

1. Dr.I.I.Sayyad-SanjivaniCOEKopargaon
Unit-2
IsometricDrawing
IsometricProjection:-Itisatypeofanaxonometric
projection(pictorialprojection)
IsometricAxes
VerticalLinesremainvertical
Horizontallinesareinclinedat30
0
IsometricLines:-
Theanglebetweentheisometricaxesis120degreesifanyline
isparalleltoitthenthosearecalledisometriclines.Auxiliarylines
maymakeanyanglewithhorizontalandobliqueisnotrelatedhere.
IsometricPlanes:-
Theplanesrepresentingthefacesofthecubeaswellas
other.planesparalleltotheseplanesaretermedasIsometric
Planes.
AnglebetweenIsometricaxes:-120°
TheYaxisremainsvertical,asintheCartesiancoordinatesystem.
However,theXaxisandtheZaxisaretiltedby30°and-30°

2. Dr.I.I.Sayyad-SanjivaniCOEKopargaon
respectively,relevanttothehorizontal.Therefore,theanglebetween
themajoraxesinanisometricrepresentationis120°.Theseaxes
formthebasisforallisometricdrawings.
Howmanyaxesanisometrichas?
Isometricprojectionisamethodforvisuallyrepresentingthree-
dimensionalobjectsintwodimensionsintechnicalandengineering
drawings.Itisanaxonometricprojectioninwhich
thethreecoordinateaxesappearequallyforeshortenedandthe
anglebetweenanytwoofthemis120degrees.
IsometricScale:-
Isometricscale=Isometriclength/Truelength
Isometricscale=cos45
0
/cos30
0
=0.8165=82%
(approximately)
IsomericLength=0.82xTruelength
IsometricProjectionlengthreduceby82%
InIsometricViewsyouhavetotakeoriginallengths

3. Dr.I.I.Sayyad-SanjivaniCOEKopargaon
IsometricviewsofSquare
Dr.I.I.Sayyad
SanjivaniCOEKopargaon