graphic expression orthographic system
TRANSCRIPT
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Collection notes
© Beatriz Defez García
© 2014, of this edition: Editorial Universitat Politècnica de València www.lalibreria.upv.es / Ref.: 6188_01_01_01
Any unauthorized copying, distribution, marketing, editing, and in general any other exploitation, for whatever reason, of this piece of work or any part thereof, is strictly prohibited without the authors’ expressed and written permission.
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1. POINT
2. LINE
3. PLANE
4. INTERSECTIONS
5. PARALLELISM
6. PERPENDICULARITY
7. ABASEMENTS
8. TURNS
9. PLANE CHANGES
10. ANGLES
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Graphic Expression
ORTHOGRAPHIC
SYSTEM
1- POINT
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1. SPACE REPRESENTATION
1. PREVIOUS CONCEPTS2. PROJECTION PLANES3. ANGLES4. BISECTORS
2. POINT REPRESENTATION
1. POINT NOTATION1. DISTANCE TO THE ORIGIN2. HEIGHT3. REMOTENESS4. DISTANCE TO THE EARTH LINE
2. POINT TYPICAL LOCATIONS3. POINT MEMBERSHIP TO THE BISECTORS
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• ORTHOGRAPHIC SYSTEM: representation systems
that uses projections
– Cylindrical– Orthogonal
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• Projection system
– VPP: VERTICALPROJECTION PLANE
– HPP: HORIZONTALPROJECTION PLANE
– PPP: PROFILEPROJECTION PLANE
– EL: EARTH LINE– Tpp: TRACE OF THE
PP
• Coordinates system
– X: DISTANCE TOORIGIN
– Y: REMOTENESS– Z: HEIGHT
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• Conversion from 3d to 2d
– VPP invariant– HPP turns 90º around EL to meet VPP– PPP turns 90º around its trace to meet VPP
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• Four angles (or
quadrants):
I, II, III and IV
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• Two
bisectors
– BI– BII
• Eight
octants:
– Ia, Ib– Iia, Iib– IIIa, IIIb– Iva, IVb
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• POINT NOTATION
A(x,y,z)X: DISTANCE TO ORIGINY: REMOTENESSZ: HEIGHT
• D: DISTANCE TO
THE EL
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• A1: HORIZONTAL
PROJECTION
• A2: VERTICAL
PROJECTION
• A3: PROFILE
PROJECTION
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A BELONGS TO ANGLE I
B BELONGS TO ANGLE II
C BELONGS TO ANGLE III
D BELONGS TO ANGLE IV
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• Represent:
– B(40,20,50)– C(-40,-100,-30)– D(90,-60,80)– E(-90,60,-80)
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– B(40,20,50)– C(-40,-100,-30)– D(90,-60,80)– E(-90,60,-80)
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A BELONGS TO B1, ANGLE I
B BELONGS TO B2, ANGLE II
C BELONGS TO B1, ANGLE III
D BELONGS TO B2, ANGLE IV
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Graphic Expression
ORTHOGRAPHIC
SYSTEM
2 - LINE
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1. GENERIC STRAIGHT LINE
1. LINE PROJECTIONS, TRACES, CROSSING ANGLES, VIEWED AND HIDDENPARTS
2. 3RD PROJECTION3. BISECTORS’ INTERSECTIONS
2. REMARKABLE LINES
1. HORIZONTAL AND FRONTAL LINES2. EXTREME AND VERTICAL LINES3. LINE CUTTING THE EARTH LINE (E.L.) AND LINE PARALLEL TO THE E.L.4. LINE LOCATED ON THE 1ST. BISECTOR AND LINE LOCATED ON THE
SECOND BISECTOR1. CUTTING THE E.L.2. PARALLEL TO THE E.L.
5. PROFILE LINE
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HO
RIZ
ON
TAL
TR
AC
E
VE
RTI
CAL
TR
AC
E
• Only the part of the
line along the 1st
angle is viewed. In
the rest of the
angles, the line is
hiddenV
ER
TIC
AL P
RO
JEC
TIO
N
HO
RIZO
NTA
L P
RO
JEC
TION
CROSSING ANGLES
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• Obtained by finding the 3rd projection of two of its points and joining them
• It is useful to locate traces and intersections with other elements also
represented in 3rd projection
• The 3rd projection of a generic line does not show the true magnitud of the line
• Straight lines are represented with thick line, continious only along the 1st
angle. This rule also applies to the 3rd projection
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• One point belongs to
one line, if the
projections of the point
are on the projections
of the line
A belongs
to r
B does not
belong to r
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• H. LINE: The vertical projection is parallel to the
E.L. and only the vertical trace exits
• F. LINE: The horizontal projection is parallel to
the E.L. and only the horizontal trace exits
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• E. LINE: Only
the horizontal
projection
and the
vertical trace
exist
• V. LINE:
Only the
vertical
projection
and the
horizontal
trace exist
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• LINE // TO
THE E.L.:
Both
projections
are parallel
to the E.L.
• LINE CUTTING
THE E.L.: Both
projections cut
the E.L. on the
same point
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• LINE ON B1:
Projections are
symmetric with
respect to the
E.L.
• LINE ON B2:
Projections are
superimposed
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• To determine a profile line, it is necessary to find its 3rd
projection (profile projection), using two given points.
• For a profile line, the 3rd projection shows the true magnitud
of the line
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Graphic Expression
ORTHOGRAPHIC
SYSTEM
3 - PLANE
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1. GENERIC PLANE REPRESENTATION: TRACES, VIEWED AND HIDDEN PARTS AND NOTATION
2. LINE MEMBERSHIP TO A PLANE
3. PLANE GIVEN BY:
1. 2 CUTTING LINES2. ONE LINE AND ONE EXTERIOR POINT3. THREE NON-ALIGNED POINTS
4. PARTICULAR PLANES
1. HORIZONTAL AND FRONTAL PLANES2. HORIZONTAL AND VERTICAL PROJECTING PLANES3. PLANE PARALLEL TO THE E.L. AND PLANE CONTAINING THE E.L.4. PLANE PERPENDICULAR TO THE 1ST BISECTOR AND PLANE PERPENDICULAR TO THE 2ND
BISECTOR5. PROFILE PLANE6. 3RD TRACE
5. REMARKABLE LINES OF A PLANE
1. HORIZONTAL AND FRONTAL LINES2. MAXIMAL SLOPE LINES3. MAXIMAL TILT LINES
6. POINT MEMBERSHIP TO A PLANE
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• NOTATION: distance from the planeend to the origin; remoteness andheight of the interesection of theplane traces with a profile planecrossing the origin of coordiantes
α (x,y,z)
• Traces are viewed along the 1st. angle.• Plane traces are represented with thick
line, continious only along the 1st angle.
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• A straight line belongs to a plane if its traces are located on the
traces of the plane
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1. 2 CUTTING LINES2. ONE LINE AND ONE EXTERIOR POINT3. THREE NON-ALIGNED POINTS
• In any case:
Build two lines Find their traces Join the traces of the same
projection plane. These linesare the traces of the solutionplane
THE TRACES OF THE PLANE SHOULD MEET AT THE E.L.
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• H. PLANE: Onlythe vertical traceexists and it isparallel to theE.L.α( ∞, ∞,z)
• V. PLANE: Onlythe horizontaltrace exists andit is parallel tothe E.L.α( ∞, y, ∞)
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• H. PROJECTING PLANE: Thevertical trace is perpendicular tothe E.L. All its elements havetheir horizontal projection on itshorizontal traceα( x, y, ∞)
• V. PROJECTING PLANE: Thehorizontal trace is perpendicular tothe E.L. All its elements have theirvertical projection on its verticaltraceα( x, ∞, z)
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• PLANE PARALLEL TOE.L.: It has their tracesparallel to the E.L.α( ∞, y, z)
• PLANE CONTAININGTHE E.L.: It has its tracescoincident with the E.L.One single point definesthe plane
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• PLANE PERPENDICULAR TO B1:
It has symmetrical traces with
respect to the E.L.
• PLANE PERPENDICULAR TO B2:
It has coincident traces
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• P. PLANE: Its traces are both perpendicular to the E.L.
Are usually used to help defining other elements
α( x,∞, ∞)
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• The 3rd trace of a plane is its intersection with the Profile Projection Plane
(P.P)
• It is obtanined by joining the intersection of the horizontal and vertical traces
of the plane on the P.P
• It is useful for the managing of particular planes, like those parallel or cutting
the Earth Line.
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• H. PLANE LINE:The horizontalprojection of the lineis parallel to thehorizontal trace ofthe plane
• F. PLANELINE: Theverticalprojection ofthe line isparallel tothe verticaltrace of theplane
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• MAX. SLOPE LINE: Itshorizontal projectionisperpendicular to thehorizontal trace of theplane
• MAX. TILT LINE: Itsvertical projection isperpendicular to thevertical trace of theplane
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• A point belongs to a plane, if the point could be located on any
of the lines that belong to that plane
• In practice, horizontal or frontal lines are used to check the
point membership to a plane, or to locate a point onto a plane
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Graphic Expression
ORTHOGRAPHIC
SYSTEM
4 - INTERSECTIONS
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1. LINES INTERSECTION
2. PLANES INTERSECTION
1. GENERIC CASE2. TRACES DO NOT MEET IN THE LIMITS OF THE PAPER FORMAT3. INTERSECTIONS WITH THE BISECTORS4. INTERSECTIONS OF PLANES PARALLEL OR CUTTING THE
EARTH LINE: USE OF THE 3RD TRACE
3. LINE AND PLANE INTERSECTION
1. GENERIC CASE2. INTERSECION OF A PROFILE LINE WITH A PLANE
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• The intersection is the
point which belongs to
both straigth lines at the
same time. The lines
define a plane.
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• Lines do not intersect if they:
– Cross each other
– Are parallel to each other
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• The intersection is the line that joins the intersection points of
the horizontal and vertical traces of the planes. Such points are
the traces of the intersection line
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• The
intersection
of horizontal
plane lines
at the same
height
provide
points of the
intersection
line of the
planes
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• The intersection
line joins the end
of the plane with
the intersection
of any of its lines
with B1
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• The intersection
line joins the end
of the plane with
the intersection
of any of its lines
with B2
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• The intersection
is obtained by
representing
both planes by
their 3rd. Trace
• The intesection
line i is parallel
to the E.L.
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• The
intersection is
obtained by
representing
both planes by
their 3rd. Trace
• The intesection
line i is parallel
to the E.L.
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• The intersection line contains the
EL. Therefore its traces are located
at the end of the common plane
• Another point of the intersection is
obtained by representing both
planes by their 3rd. Trace using a
profile plane
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• GENERIC METHOD:
intersection between
plane α and line r
– Build an auxiliar planeφ containg the line r
– Find the intersectionline i between planes αand φ
– Find the intersectionpoint I between lines rand i. THIS IS THEINTERSECTIONPOINT
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• The intersection is obtained
by representing both planes
by their 3rd. Trace
• The intesection line i is
parallel to the E.L.
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• GENERIC METHOD:
intersection between
plane α and line r
– Build an auxiliar planeφ containg the line r
– Find the intersectionline i between planes αand φ
– Find the intersectionpoint I between lines rand i. THIS IS THEINTERSECTIONPOINT
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46
• PROFILE LINE:
intersection between
plane α and profile line r
– Build an auxiliar planeφ containg the line r. φis a profile plane
– Represent the thirdprojection of line r andthe third trace of planeα according to plane φ: α3 and r3
– Find the intersectionbetween α3 and r3.This point is I3.
– Find the orthographicprojections of I: I1 andI2. THIS IS THEINTERSECTIONPOINT
I3
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Graphic Expression
ORTHOGRAPHIC
SYSTEM
5 - PARALLELISM
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1. LINES PARALLELISM
1. PROFILE LINES
2. PLANES PARALLELISM
1. SPECIAL PLANES
3. LINE AND PLANE PARALLELISM
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• Two straight lines
are parallel if their
projections on the
same projection
plane are parallel to
each other
– s1 // r1– s2 // r2– s3// r3
• Case: drawing s
paralell to r by point
A
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• For profile lines, it is
necessary to work with
their the 3rd projection
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• Two planes are
parallel if their
traces on the
same projection
plane are parallel
to each other
– α1 // β1– α2 // β2– α3 // β3
• Case: drawing β
paralell to α by
point A
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• For planes
parallel to
the E.L, or
containing
the E.L., it is
necessary
to work with
their 3rd
trace
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• One plane is
parallel to one
straight line if the
plane contains
one line parallel to
the first one
• Case: drawing α,
parallel to r and
containing u
• For special lines
and/or planes it is
necessary to work
with their 3rd
projection or 3rd
trace
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Graphic Expression
ORTHOGRAPHIC
SYSTEM
6 - PERPENDICULARITY
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1. LINE AND PLANE PERPENDICULARITY
1. Line perpendicular to a plane by a given point2. Plane perpendicular to a line by a given point
2. PLANES PERPENDICULARITY
1. Plane perpendicular to another plane, by a given line2. Plane perpendicular to another plane, by a given point
3. LINES PERPENDICULARITY
1. Line perpendicular to another line by a given point
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• The projections
of the line are
pependicular to
the traces of the
plane on the
same projection
plane.
– r1 ┴ α1– r2 ┴ α2
• Case: drawing r
perpendicular to
α by point A
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• Case: drawing α
perpendicular to r
by point A
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• Plane β is
perpendicular to
plane α, if β
contains any line
perpendicular to α:
β ┴ α↔ sЄ β ; s ┴ α
• Case: drawing β
perpendicular to α,
and containing line
r
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• In general two lines which
are perpendicular in the
space do not have
perpendicular projections
• Case: drawing line s,
perpendicular to line r, by
point A:
– Build an auxiliar plane φperpendicular to line r bypoint A
– Find the intersection point Ibetween plane φ and line r.
– Join points A and I by astraight line. THIS LINE ISS, THE SOLUTION
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• In general two lines which
are perpendicular in the
space do not have
perpendicular projections
• Case: drawing line s,
perpendicular to line r, by
point A:
– Build an auxiliar plane φperpendicular to line rby point A
– Find the intersectionpoint I between plane φand line r
– Join points A and I by astraight line. THIS LINEIS S, THE SOLUTION
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• For especial lines and planes, it is necessary
to work with their 3rd projection or 3rd trace
to draw perpendicular elements
– Profile lines– Planes parallel to the E.L.– Planes containing the E.L.
• The perpendicular angle could be drawn on a
profile plane
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Graphic Expression
ORTHOGRAPHIC
SYSTEM
7 - ABASEMENTS
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1. PREVIOUS CONCEPTS
2. POINT ABASEMENT
1. GENERIC METHOD2. HORIZONTAL ABASEMENT. TRIANGLE METHOD.
3. PLANE ABASEMENT
1. COMMON PLANES2. REDUCED ABASEMENT METHOD FOR POINTS AND LINES3. PROJECTING PLANES4. SPECIAL PLANES
1. PLANES PARALLEL TO THE E.L.2. PLANES CONTAINING THE E.L.
4. AFINITY
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• ABASEMENT: turn of one element around one
abasement axis (“charnela”) to place it on one of the
projection planes or a plane parallel to them (eirther
a horizontal or a vertical plane)
• OBJECTIVE: to obtain the true magnitude (distances
and angles) of the elements contained on any kind of
plane
• LETERING
– (A)– (r)– (α1), (α2)
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• It is necessary to abase
distance of the point to
the abasement axis
around it
• Usefull to find the true
magnitude of elements
regardless the plane that
contain them.
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• Usefull to find the
true magnitude of
elements regardless
the plane that contain
them.
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B2
B1
A2
A1
h2
h1
(B)
(A)
M
N
B2
B1
A2
A1
h2
h1
B2
B1
A2
A1
h2
h1
B2
B1
A2
A1
h2
h1
M
N
B2
B1
A2
A1
h2
h1
(B)
(A)
M
N
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• Elements are turned
on a plane parallel to
one projection plane.
• Useful to find the
true size of figures.
• The generic method
for the points
abasement is
applied.
B2
B1
A2
A1
(B)
(A)
M
N
C1
C2
B2
B1
A2
A1C1
C2
B2
B1
A2
A1C1
C2
B2
B1
A2
A1
M
N
C1
C2
B2
B1
A2
A1
(B)
(A)
M
N
C1
C2
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• Elements are turned
on a plane parallel to
one projection plane.
• Useful to find the
true size of figures.
• The generic method
for the points
abasement is
applied.
B2
B1
A2
A1
(B)
(A)
B2
B1
A2
A1
B2
B1
A2
A1(A)
B2
B1
A2
A1(A)
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• Abasement of one
trace around the other
one to place it on the
corresponding
projection plane.
M
C1
C2
(C)
P1-P2
• It is made by the abasement of
two points: the plane end
(remains invariant) and one
point belonging to the trace to
abase.
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• Since both points belong to one projection plane, the segment that
joins them is in true magnitude.
C1C2
(C)
P1-P2 C1C2
P1-P2 C1C2
(C)
P1-P2
C1
C2
(C)
P1-P2
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• Based on the
abasement of
the plane that
contains the
elements
Vr2
(Vr)
(A)
(r)
r2
r1Hr1
A2
A1
Vr1Hr2
Vr2
r2
r1Hr1
A2
A1
Vr1Hr2
Vr2
(Vr)
r2
r1Hr1
A2
A1
Vr1Hr2
Vr2
(Vr)
r2
r1Hr1
A2
A1
Vr1Hr2
Vr2
(Vr)
(r)
r2
r1Hr1
A2
A1
Vr1Hr2
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• Horizontal and frontal lines are used to abase points.• On an abasement on the HPP, a horizontal line remais
parallel to the horizontal trace of the plane, and a frontalline remains parallel to the abased vertical trace of theplane.
• On an abasement on the VPP, a frontal line remais parallelto the vertical trace of the plane, and a horizontal lineremains parallel to the abased horizontal trace of the plane.
• Profile lines are abased using their 3rd projection.
h1
h2
(Vu2)
Vh2
(h)
A1
A2
Vh1
h1
h2
(Vh2)
Vh2
(h)
f1
f2
Hf1
(f)
Vh1Hf2
(A)
h1
h2
(Hf)
Vh2
(h)
f1
f2
Hf1
(f)
Vh1Hf2
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• The abased trace holds 90º with the abasement axis
C1
C2
(C)
P1-P2C1
C2
(C)P1-P2
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• Abasement done with help of their
3rd trace.
• The abasement on the HPP
requires and indermediate turn.
• The abasement on the VPP is
direct.
P.P.
N
P.P.P.P.P.P.
N
P.P.
N P.P.
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• Abasement
done with help
of their 3rd
trace.
P.P. P.P.
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• Afinity could be
applied to simplify
the building of
figures
– The points of theturning axis areabased andprojectedsimoustaneously
– The geometriccorrelations of thefigure elementsare kept in boththe abasementand theprojections
ß1
ß2
(ß2)
B2
C2
A2
B1
C1A1
(B)
(A)
(C)
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Graphic Expression
ORTHOGRAPHIC
SYSTEM
8 - TURNS
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1. PREVIOUS CONCEPTS
1. ELEMENTS SHOWING TRUE MAGNITUDES2. TRUE DISTANCES
2. POINT TURN
1. AROUND A VERTICAL AXIS2. AROUND AN EXTREME AXIS (“EJE DE PUNTA”)
3. LINE TURN
1. GETTING FRONTAL AND HORIZONTAL LINES2. GETTING SPECIAL LINES
4. PLANE TURN
1. GENERAL TURN2. GETTING PROJECTING PLANES3. GETTING SPECIAL PLANES
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• TURN: angular displacement of one element around one
turning axis to place it on a more convenient position. The turn
usually involves a change in the nature of the element.
• TURNING AXIS:
– Vertical lines: change on the horizontal projection of the element– Extreme lines (“rectas de punta”): change on the vertical
projection of the element.
• OBJECTIVE: to obtain the true magnitude (distances and
angles) of the elements regardless their initial nature.
• LETERING
– A1’, A2’– r1‘, r2’– α1’, α2’
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ß2
ß1
ß2
ß1
r2
r1
A2
B2
A1 B1
r2
r1
A2 B2
A1
B1
• Horizontal and frontal
lines, horizontal and
vertical projecting planes,
show true magnitudes on
their respective
projections
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• The distance between one point and one line could be directly
measured, if the line is:
– EXTREME LINE: Distance A-e= Disntace A2-e2– VERTICAL LINE: Distance A-v= Distance A1-v1
A2
e2
A1e1
v2A2
A1
v1
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• The distance between one point and one line could be directly
measure if the plane is:
– HORIZONTAL PROJECTING PLANE: Distance A-φ= Distance A1- φ 1– VERTICAL PROJECTING PLANE: Distance A-σ= Distance A2- σ 2
A2
A1
A2
A1
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• Around a vertical axis: A1 rotates, A2 keeps the same height.
• Around an extreme axis: A2 rotates, A1 keeps the same
remoteness
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• Around a vertical axis: A1 rotates, A2 keeps the same height.
• Around an extreme axis: A2 rotates, A1 keeps the same
remoteness
A2
A1
v2
v1
A2'
A1'
A1
A2
e2
e2
A1'
A2'
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• Made by the turn of two of its
points
– Around a vertical axis:getting a frontal line
– Around an extreme axis:getting a horizontal line
• Two directions (clockwise
and counter-clockwise are
possible)
• Turning axis cuts the line: the
intersección point remains
invariable
• If the turning axis does not
cut the line: the “tangency”
point T has to be found and
turned first
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• Made by the turn of two of its points
– Around a vertical axis: getting a frontal line– Around an extreme axis: getting a horizontal line
• Two directions (clockwise and counter-clockwise are possible)
• Turning axis cuts the line: the intersección point remains invariable
r2
A2
A1
v2
v1
A2'
A1'
r1
r2'
r1'
r1
A1
e1
A1'
r1'
A2
e2A2'
r2r2'
I2
I1
I2
I1
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• If the turning axis does not cut the line: the “tangency” point T
has to be found and turned first
r2A2
A1
v2
v1
A2'
A1'r1
r2'
r1'
T2'
T1
T1'
T2
r1A1
A2
e1
e2
A1'
A2'r2
r1'
r2'
T1'
T2
T2'
T1
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• Frontal line
around a
extreme axis:
vertical line
or line
parallel to
the E.L.
• Horizontal
line around
vertical axis:
extreme line
or line
parallel to
the E.L.
r2
T2
T1'
e2
e1
r1
r2'
r1'
T2'
T1
r2
T2
T1'
e2
e1
r1
r2'
r1'
T2'
T1
r1
v1
r1'
v2
r2r2'
T2
T1
T1'
T2'
r1v1
r1'
v2
r2r2' T2
T1
T1'
T2'
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• I, interseccion point between axis and
plane, remains constant during the turn
• Horizontal (or frontal) plane lines are
used as auxiliary elements
h1
v1
h1'
v2
h2
T1T1'
ß1
ß2
h2'I2ß2'
ß1'
I1
Vh2
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• Specific turns could change generic planes into projecting planes:
– Around a vertical axis: vertical projecting plane– Around an extrem axis: horizontal projecting planes
h1
v1
v2
h2
T1T1'
ß2
I2
ß2'
ß1'f1
e1
e2
f2
T2
T2'
ß1
ß2
I2
ß2'
ß1'
I1
I1
Vh2
Hf1ß1
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• For instance,
getting a plane
parallel to the
E.L.
v1
v2 ß2
ß1
v1
v2
T1
T1'
ß2
ß1'
ß1
u1v1
v2
u2
T1
T1'
ß2
I2
ß1'
I1
ß1
u1v1
v2
u2
T1
T1'
ß2
I2
ß1'
I3 ß3'
I1
ß1
u1v1
v2
u2
T1
T1'
ß2
I2
ß2'
ß1'
I3 ß3'
I1
ß1© Beatriz Defez García
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Graphic Expression
ORTHOGRAPHIC
SYSTEM
9 – PLANE CHANGES
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1. PREVIOUS CONCEPTS
2. POINT PLANE CHAGE
1. HORIZONTAL PLANE CHANGE2. VERTICAL PLANE CHANGE
3. LINE PLANE CHANGE
1. GETTING HORIZONTAL AND FRONTAL LINES2. GETTING EXTREME AND VERTICAL LINES3. GETTING LINES PARALLEL TO THE E.L.
4. PLANE PLANE CHANGE
1. GETTING PROJECTING PLANES2. GETTING FRONTAL AND HORIZONTAL PLANES3. GETTING PLANES PARALLEL TO THE E.L.
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• PLANE CHANGE: change of one of the PROJECTION PLANES at a time to change
the projection of the graphic elements. The plane change usually involves a change
in the nature of the element with respect to the new projection planes.
• OBJECTIVE: to obtain the true magnitude (distances and angles) of the elements
regardless their initial nature.
• LETERING
– A1’, A2’– r1 ’, r2’– α1’, α2’
• PLANE CHANGE NOTATION
– Each new E.L. is accompanied by an aditional pair of lateral strokes. The location ofthe strokes determine the positive sense of the remoteness and height axes.
– Each new E.L. is accompanied by a leged consisting of a key, a capital letter (H or V)indicating the projection plane that changes, the number of that plane change, and asecond capital letter indicating the proyection plane that remains invariant (H or V).
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• One of the projection
planes changes its
location. As a
consequence, the
projection of the point
on that projection
plane changes.
• However, the magnitud
of the projection that
changes (remoteness
for the horizontal
projection; and height
for the vertical
projection) remains the
same.
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• HORIZONTAL PLANE CHANGE:
– A2 remains the same, but zA changes– A1 changes, but yA remains the same: A1’
• VERTICAL PLANE CHANGE:
– A2 changes, but zA remains the same: A2’– A1 remains the same, but yA changes
A2
A1
{H1V
A1'
A2
A1
{V1
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• One of the projection planes changes to become parallel to the line.
• The new E.L. becomes parallel to one of the projections of the line
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• HORIZONTAL PLANE CHANGE: getting a horizontal line
– r2 remains the same, but with a constant height: r2’ parallel to the E.L
– r1 changes, but its points keep the same remoteness
• VERTICAL PLANE CHANGE: getting a frontal line
– r2 changes, but its points keep the same height– r1 remains the same, but with a constant remoteness:r1’ parallel to the E.L
A2
A1
{ H1
V
B2
B1
A1' B1'r1'
r2
r1
A2
A1
B2
B1
A2' B2'r2'
r2
r1 {V1 H
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• The initial line should be a horizontal or a frontal line
• One of the projection planes changes to become perpendicular to the line.
• The new E.L. becomes perpendicular to one of the projections of the line
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• FROM A HORIZONTAL LINE, A VERTCIAL PLANE CHANGE COULD GET AN EXTREME
LINE
– r2 changes, but its points keep the same height and concentrate on a single point– r1 remains the same, but perpendicular to the E.L
• FROM A FRONTAL LINE, A HORIZONTAL PLANE CHANGE COULD GET A VERTICAL LINE
– r2 remains the same, but perpendicular to the E.L
– r1 changes, but its points keep the same remoteness and concentrate on a single point
r1'
r2
r1
{V1
H
r2'
r2
r1
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• The initial line should
be a horizontal or a
frontal line
• One of the projection
planes changes to
become parallel to the
line.
• The new E.L. becomes
parallel to both
projections of the line
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• FROM A HORIZONTAL LINE, A VERTICAL PLANE CHANGE COULD GET LINE PARALLEL TO THE E.L.
– r2 changes, but its points keep the same height: r2’ parallel to the E.L.
– r1 remains the same, but parallel to the E.L
• FROM A FRONTAL LINE, A HORIZONTAL PLANE CHANGE COULD GET A LINE PARALLEL TO THE E.L.
– r2 remains the same, but is parallel to the E.L
– r1 changes, but its points keep the same remoteness: r1’ parallel to the E.L.
r2
r1
{V1H
r2' r2
r1
r1'
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• One of the projection
planes changes to
become perpendicular
to the plane
• The new E.L. becomes
perpendicular to one
of the traces of the
plane
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• HORIZONTAL PLANE CHANGE: getting a horizontal projecting plane
– β2 remains the same, but perpendicular to the E.L.– β 1 changes
• VERTICAL PLANE CHANGE: getting a vertical projecting plane
– β 2 changes– β 1 remains the same, but perpendicular to the E.L.
ß2
ß1
ß2'
{V1
HA2
A2'
A1
ß2
ß1
ß1'
{H1V
A2
A1' A1
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• The initial plane
should be a horizontal
or a vertical projecting
plane
• One of the projection
planes changes to
become parallel to the
plane
• The new E.L. becomes
parallel to both planes
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• FROM A HORIZONTAL PROJECTING PLANE, A VERTICAL PLANE CHANGE COULD GET A FRONTAL
PLANE
– β2 disapears– β1 remains the same, but parallel to the E.L
• FROM A VERTICAL PROJECTING PLANE, A HORIZONTAL PLANE CHANGE COULD GET A HORIZONTAL
PLANE
– β2 remains the same, but parallel to the E.L
– β1 disapears
ß2
ß1
{V1H
ß2
ß1© Beatriz Defez García
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• HORIZONTAL PLANE CHANGE: getting a plane
parallel to the E.L.
– β2 remains the same, but parallel to the E.L.– β1 changes, β1’ parallel to the E.L.
• VERTICAL PLANE CHANGE: getting a plane
parallel to the E.L.
– β 2 changes, β2’ parallel to the E.L.
– β 1 remains the same, but parallel to the E.L.
ß2
ß1ß1'
{VH1
A2
A1' A1
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Graphic Expression
ORTHOGRAPHIC
SYSTEM
10 – ANGLES
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1. ANGLE BETWEEN A LINE AND THE PROJECTION PLANES
1. ABASEMENT (TRIANGLE METHOD)2. TURN3. PLANE CHANGE
2. ANGLE WITHIN LINES
1. ABASEMENT (GENERIC OR REDUCED)
3. ANGLE BETWEEN A PLANE ANDTHE PROJECTION PLANES
1. TURN2. PLANE CHANGE3. ABASEMENT OF PLANE’S MAX. SLOPE AND MAX. TILT ANGLE LINES
4. ANGLE BETWEEN LINE AND PLANE
5. ANGLE BETWEEN TWO PLANES
6. CONDITIONING ANGLES
1. LINES2. PLANES
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• ABASEMENT (TRIANGLE METHOD)
r2
r1
(r)
(Vr)
(r)(Hr)
Vr2
Hr2
Hr1
Hr2
r2
r1
A2
B2
A1 B1
r2
r1
A2 B2
A1
B1
• TURNS AND PLANE CHANGES
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• ABASEMENT OF BOTH LINES, USING THE SAME METHOD
(GENERIC OR REDUCED)
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• TURNS AND PLANE CHANGES
ß2
ß1
ß2
ß1
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• ABASEMENT OF
• MAX. SLOPE LINE ON THE HPP: angle with HPP
• MAX. TILT LINE ON THE VPP: angle with VPP
m1
Vm2
m2
(Vm)
(m)
Vm1Hm2
Hm1
ß1
ß2
(Ht)
t1
Ht1
t2
(t)
Ht2
Vt2
Vt1
ß1
ß2
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1) Find point I, the
intersection between r and
β
2) Trace line s, perpendicular
to β by a point of r, point P
3) Find point J, the
intersection between s and
β
4) Trace line u by I and J
5) Find plane φ, which
contains r and u
6) Abase φ . Abase r and u
accordingly. Measure the
angle between r and u on
the abasement. This is
angle between r and β© Beatriz Defez García
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1) Find line i, the intersection
line between α and β
2) Draw plane φ,
perpendicular to α and β
(and therefore to i) by any
given point
3) Find line r, the intersection
line between α and φ
4) Find line s, the intersection
line between β and φ
5) Abase φ. Abase r and s
accordingly. Measure the
angle between r and s on
the abasement. This is
angle between α and β
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• Drawing lines which hold especific angles with the projection
planes
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A2
A1
r2
r1
B2
B1
s2
s1
f2
f1 h1
h2
• Drawing lines which hold specific angles with the projection
planes
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• Drawing lines which hold specific angles with both projection
planes at the same time
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• Drawing lines which hold specific angles with both projection
planes at the same time
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• Drawing planes which hold specific angles with the PP:
conditioning their maximal slope or maximal tilt lines
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• Drawing planes which
hold angles with the
PP: conditioning their
maximal slope or
maximal titlt lines
B2
B1
ß1
ß2
m1
f2
f1
m2
Vm2
Hm1
Vm1Hm2
B2
B1
B2
B1
f2
f1
B2
B1
m1
f2
f1
m2
Vm2
Hm1
Vm1Hm2
B2
B1
ß1
m1
f2
f1
m2
Vm2
Hm1
Vm1Hm2
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