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KEEP CALM
AND
STUDY HARD
DESIGN & COMMUNICATION GRAPHICS (D.C.G.) LEAVING CERTIFICATE EXAM GUIDANCE & REVISION NOTES JOSEPH LYSTER LINE IT OUT © PATRICIAN SECONDARY SCHOOL NEWBRIDGE, CO. KILDARE, REP. OF IRELAND. mailto: josephlyster@patriciansecondary.com Website: www.slideshare.net/WT4603
A. EXAM GUIDANCE [GENERAL] 1. FORMAT 2. TIMING 3. SUGGESTED APPROACH B. CORE GEOMETRY TOPICS [SECTION A+B] 1. ORTHOGRAPHIC PROJECTION 2. AUXILIARY PROJECTION 3. AXONOMETRIC PROJECTION 4. DEVELOPMENT OF SURFACES 5. ROTATION OF OBJECTS 6. SOLIDS IN CONTACT 7. OBLIQUE PROJECTION 8. CO-ORDINATE GEOMETRY 9. SKEW LINES 10. PERSPECTIVE PROJECTION 11. CONIC SECTIONS C. APPLIED GRAPHICS [SECTION C] 1. GEOLOGIC GEOMETRY 2. STRUCTURAL FORMS 3. SURFACE GEOMETRY
CONTENTS
FORMAT:
EXAM DURATION
HIGHER LEVEL = 3 HOURS
ORDINARY LEVEL = 3 HOURS
EXAM PAPER STRUCTURE
THREE SECTIONS IN EXAM PAPER
SECTION A = MIXED TOPIC SHORT QUESTIONS
FOUR SHORT QUESTIONS (ANSWER ANY THREE)
SECTION B = CORE GEOMETRY
THREE LONG QUESTIONS (ANSWER ANY TWO)
SECTION C = APPLIED GRAPHIC
FIVE LONG QUESTIONS (ANSWER ANY TWO)
EXAM GUIDANCE
TIMING: HIGHER & ORDINARY LEVEL: 3 HOURS (180 MINUTES)
SPEND 3 TO 5 MINUTES PREVIEWING EXAM PAPER AT START
SECTION A: RECOMMENDED TIME = 45 MINUTES MAX
SECTION B: RECOMMENDED TIME = 65 MINUTES MAX (32.5 MIN/QUESTION)
SECTION C: RECOMMENDED TIME = 65 MINUTES MAX (32.5 MIN/QUESTION)
KEY TIP: WHEN STUDYING, GET INTO THE HABIT OF DOING QUESTIONS RELATIVE TO THE TIMING SUGGESTED. WHEN IN THE EXAM, HAVE TIME QUES OR BE VIGILANT OF TIME DURING THE EXAM TO REMIND YOU TO PROGRESS FROM ONE QUESTION TO ANOTHER.
EXAM GUIDANCE
SUGGESTED APPROACH: BE ‘SMART’… DON’T PANIC, EASY FOR ME TO SAY BUT REALLY DON’T PANIC. THE EXAM PAPER WILL
LOOK DIFFERENT BECAUSE ALL OF THE QUESTIONS ARE NEW AND PREVIOUSLY UNSEEN. TAKE A MINUTE TO RELAX AND THEN CONFIRM TO YOURSELF THAT YOU ARE REFINED IN THE METHODS /UNDERSTANDING TO ANSWERING SUCH QUESTIONS. REMEMBER THAT YEAR ON YEAR THE FACE OF THE QUESTIONS MAY CHANGE BUT THE DETAIL IS THE SAME, THE METHODS ARE CONSISTENT AND THERE IS A LOGICAL SEQUENCE TO BE FOLLOWED IN ALL CASES.
UPON REVIEW OF EXAM PAPER, MARK THE QUESTIONS YOU FEEL MOST CONFIDENT ABOUT DOING
DO SECTION ‘A’ FIRST AND BEGIN WITH WHATEVER QUESTION YOU FEEL YOU CAN ANSWER BEST
MOVE ONTO SECTION ‘B’ AND AGAIN BEGIN WITH YOUR STRONGEST QUESTION
MOVE ONTO SECTION ‘C’ AND ONCE MORE BEGIN WITH YOUR STRONGEST QUESTION
IN ALL CASES, REMEMBER TO DOUBLE CHECK WHAT THE QUESTION IS ASKING YOU. IT IS NOT UNCOMMON TO PRESUME SOMETHING OR OVERLOOK SOMETHING. BE DILLIGENT HERE.
IF ALL ELSE FAILS JUST HAVE A GO. DO WHAT YOU CAN AND REMEMBER AN AUXILIARY VIEW HERE OR THERE WILL DO NO HARM
IF YOU HAVE TIME AT THE END, SPEND IT BY REVIEWING THE WORK YOU HAVE DONE OR TIDYING UP/FINISHING INCOMPLETE QUESTIONS
DO NOT LEAVE THE EXAM HALL WITHOUT HAVING ATTEMPTED THE REQUIRED AMOUNT OF QUESTIONS TO THE BEST OF YOUR ABILITY.
EXAM GUIDANCE
MAKE SURE YOU HAVE ALL OF THE REQUIRED DRAWING EQUIPMENT
WITH YOU FOR THE EXAM!!!
EXAM GUIDANCE
2016 PREDICTIONS
A1 A2 A3 A4 B1 B2 B3 C1 C2 C3
2009 CONIC PERSPECTIVE AXONOMETRIC SOLIDS IN CONTACT OBLIQUE CO-ORDINATE GEOMETRY INTERPENETRATION STANDARD, RISING ETC.
HYPERBOLIC PARABOLOID
AND HYPERBOLOID OF
REVOLUTION
CONICAL SURFACE
DEVELOPMENT WITH CONIC
FOCAL SPHERE ETC.
2010 SKEW LINES AXONOMETRIC CONIC OBLIQUE PERSPECTIVE OBLIQUE CO-ORDINATE GEOMETRY STANDARD, RISING ETC. HYPERBOLIC PARABOLOID
OVEN HOOD STRUCTURE WITH
CYLINDRICAL SURFACE
DEVELOPMENT
2011 AUXILIARY CONIC SKEW LINES SOLIDS IN CONTACT INTERPENETRATION AXONOMETRIC DIMETRIC CONIC STANDARD, FALLING ETC. HYPERBOLIC PARABOLOID ROOF STRUCTURE - USUAL
2012 AXONOMETRIC AUXILIARY ROTATION PERSPECTIVE CONIC INTERPENETRATION CO-ORDINATE GEOMETRY STANDARD, FALLING ETC.HYPERBOLOID OF
REVOLUTIONROOF STRUCTURE - USUAL
2013 ORTHOGRAPHIC SOLIDS IN CONTACT INTERPENETRATION SKEW LINES OBLIQUE AXONOMETRIC DIMETRIC PERSPECTIVE AND SKEW LINES STANDARD, FALLING ETC.SHELL TRANSLATION
STRUCTURE
DIAMOND SUFACE
STRUCTURE, USUAL
2014 ORTHOGRAPHIC OBLIQUE CONIC PERSPECTIVE CO-ORDINATE GEOMETRY AXONOMETRIC TRIMETRIC AUXILIARY STANDARD, RISING ETC.SHELL TRANSLATION
STRUCTUREROOF STRUCTURE - USUAL
2015OBLIQUE
PLANES/ORTHOGRAPHICCONIC
CO-ORDINATE
GEOMETRY/OBLIQUE PLANESSKEW LINES AUXILIARY/CONIC
AXONOMETRIC/
INTERPENETRATIONPERSPECTIVE
STANDARD, ROAD RISING,
THICKNESS OF STRATUM AND
VERTICAL PROFILING
HYPERBOLIC PARABOLOID
WITH AUXILIARY AND SKEW
LINES
ROOF STRUCTURE - USUAL
2016? PERSPECTIVE AXONOMETRIC SOLIDS IN CONTACT ORTHOGRAPHIC/AUXILIARYOBLIQUE/CO-ORDINATE
GEOMETRYCONIC INTERPENETRATION STANDARD
HYPERBOLOID OF
REVOLUTION & SHELL
ROOF &
CONICAL/CYLINDRICAL
THIS IS ONLY A GUESS! PREPARE FOR ALL TOPICS EQUALLY!
OVERVIEW
WE DRAW USING ‘FIRST ANGLE’ PROJECTION AND IN THE CONTEXT OF D.C.G. ORTHOGRAPHIC PROJECTION IS FUNDAMENTAL TO ALL TOPIC AREAS, JUST AS PARAGRAPHS ARE IN THE STRUCTURING OF AN ENGLISH ESSAY.
ORTHOGRAPHIC PROJECTION ALLOWS US TO SYSTEMATICALLY ARRANGE MUTLIPLE VIEWS OF A GIVEN OBJECT/STRUCTURE ETC IN A MANNER THAT ALLOWS FOR COMMON INTERPRETATION.
WE HAVE THREE TYPICAL VIEWS, NAMELY ELEVATION [FRONT VIEW], PLAN [TOP VIEW] & END VIEW [SIDE VIEW].
WE ALSO HAVE AUXILIARY VIEWS, OF WHICH WE CAN HAVE AN AUXILIARY PLAN VIEW OR AN AUXILIARY ELEVATION VIEW. WE WILL CLARIFY BOTH FURTHER ON IN THESE STUDY NOTES.
IN CONSIDERATION OF STANDARD ORTHOGRAPHIC VIEWS, THIS EXIST ON THE VERTICAL AND HORIZONTAL PROJECTION PLANES.
WE ALSO HAVE AUXILIARY PLANES, SIMPLY INCLINED PLANES, OBLIQUE PLANES AND AXONOMETRIC PLANES THAT ALL FACILITATE VARIOUS FORMS OF TECHNICAL PRINCIPLES AND GEOMETRY.
ORTHOGRAPHIC PROJECTION
ORTHOGRAPHIC PROJECTION
ORTHOGRAPHIC PROJECTION DEALING WITH CURVED SURFACES IN ORTHOGRAPHIC
OVERVIEW
STANDARD AUXILIARY PROJECTION
AUXILIARY ELEVATION
AUXILIARY PLAN
AUXILIARY ELEVATION: PROJECT FROM PLAN AND TAKE MEASUREMENTS FROM ELEVATION
AUXILIARY PLAN: PROJECT FROM ELEVATION AND TAKE MEASUREMENTS FROM PLAN
AUXILIARY PROJECTION
AUXILIARY ELEVATION
OVERVIEW
DEVELOPMENT OF SURFACES
DEVELOPMENT OF SURFACES
DEVELOPMENT OF SURFACES
DEVELOPMENT OF SURFACES
OVERVIEW
AXONOMETRIC PROJECTION
TYPE 1: ISOMETRIC AXONOMETRIC PLANE IS AN EQUILATERAL TRIANGLE IN QUESTION ASSUME AS NORMAL
TYPE 2: DIMETRIC AXONOMETRIC PLANE IS AN ISOSCELES TRIANGLE IN QUESTION FOLLOW GIVEN ANGLES
TYPE 3: TRIMETRIC AXONOMETRIC PLANE IS AN IRREGULAR TRIANGLE IN QUESTION FOLLOW GIVEN ANGLES
AXONOMETRIC PROJECTION ISOMETRIC
AXONOMETRIC PROJECTION DIMETRIC
AXONOMETRIC PROJECTION DIMETRIC
AXONOMETRIC PROJECTION TRIMETRIC
OVERVIEW
SIMPLY INCLINED PLANES
SIMPLY INCLINED PLANE EXAMPLE
OBLIQUE PLANES
OBLIQUE PLANES LOCATING POINTS USING TRACE METHOD
OBLIQUE PLANES PENTAGONAL EXAMPLE TRUE SHAPE USING AUXILIARY
OBLIQUE PLANES CYLINDER EXAMPLE TRUE SHAPE USING AUXILIARY
OBLIQUE PLANES ADVANCED EXAMPLE
1 2
3 4 5
OBLIQUE PLANES EXAM EXAMPLE
OBLIQUE PLANES EXAM EXAMPLE
OBLIQUE PLANES EXAM EXAMPLE
OVERVIEW
INTERPENETRATION OF SOLIDS
INTERPENETRATION OF SOLIDS
INTERPENETRATION OF SOLIDS
INTERPENETRATION OF SOLIDS
OVERVIEW
PERSPECTIVE PROJECTION
PERSPECTIVE PROJECTION
FINDING AUXILIARY VP
STANDARD SET-UP
1
2
REVERSE METHOD
PERSPECTIVE PROJECTION
PERSPECTIVE PROJECTION
OVERVIEW
CONIC SECTIONS
ELLIPSE BY CONCENTRIC CIRCLES METHOD
PARABOLA BY RECTANGLE METHOD
CLASSIFICATION OF CONIC SECTIONS
CONIC SECTIONS
CONIC SECTIONS
CONIC SECTIONS
CONIC SECTIONS
CONIC SECTIONS
CONIC SECTIONS
CONIC SECTIONS
CONIC SECTIONS
CONIC SECTIONS
OVERVIEW
CO-ORDINATE GEOMETRY TYPE 1: COMMON LINE
LINE AB = LINE OF INTERSECTION [LOI] X1Y1 PARALLEL TO LINE AB IN PLAN X2Y2 PERPENDICULAR TO TRUE LENGTH OF LOI
MEASUREMENTS TAKEN FROM X1Y1 BACK INTO PLAN VIEW
MEASUREMENTS TAKEN FROM XY TO ELEVATION
CO-ORDINATE GEOMETRY TYPE 2: COMMON POINT
POINT A = COMMON POINT USE A LEVEL CUT LINE FIND LINE OF INTERSECTION [LOI] IN PLAN X1Y1 PARALLEL TO ‘LOI’ X2Y2 PERPENDICULAR TO TRUE LENGTH OF LOI
MEASUREMENTS TAKEN FROM X1Y1 BACK INTO PLAN VIEW
MEASUREMENTS TAKEN FROM XY TO ELEVATION
CO-ORDINATE GEOMETRY
TYPE 3: NO COMMON POINT NO COMMON LINE
MEASUREMENTS TAKEN FROM X1Y1 BACK INTO PLAN VIEW
MEASUREMENTS TAKEN FROM XY TO ELEVATION
POINT A = COMMON POINT USE ‘TWO’ LEVEL CUT LINES FIND LINE OF INTERSECTION [LOI] IN PLAN X1Y1 PARALLEL TO ‘LOI’ X2Y2 PERPENDICULAR TO TRUE LENGTH OF LOI
CO-ORDINATE GEOMETRY
CO-ORDINATE GEOMETRY
CO-ORDINATE GEOMETRY
CO-ORDINATE GEOMETRY SKEW LINES SHORTEST DISTANCE
USE LEVEL LINE FIND POINT ‘O’ IN ELEVATION AND PLAN X1Y1 PERPENDICULAR TO LINE ‘AO’ IN PLAN X2Y2 PARALLEL TO LINES ‘AB’ AND ‘CD’ IN FIRST AUXILIARY
MEASUREMENTS TAKEN FROM X1Y1 BACK INTO PLAN VIEW
MEASUREMENTS TAKEN FROM XY TO ELEVATION
CO-ORDINATE GEOMETRY SKEW LINES SHORTEST HORIZONTAL DISTANCE USE LEVEL LINE
FIND POINT ‘O’ IN ELEVATION AND PLAN X1Y1 PERPENDICULAR TO LINE ‘AO’ IN PLAN X2Y2 PERPINDICULAR TO X1Y1
MEASUREMENTS TAKEN FROM X1Y1 BACK INTO PLAN VIEW
MEASUREMENTS TAKEN FROM XY TO ELEVATION
OVERVIEW
GEOLOGIC GEOMETRY
GEOLOGIC GEOMETRY
GEOLOGIC GEOMETRY
GEOLOGIC GEOMETRY
GEOLOGIC GEOMETRY
CUT CONE INVERTED
FILL CONE UPRIGHT
PLANNING FOR ROADS THAT RISE OR FALL – THE CONE METHOD
GEOLOGIC GEOMETRY
GEOLOGIC GEOMETRY
GEOLOGIC GEOMETRY
GEOLOGIC GEOMETRY
OVERVIEW
STRUCTURAL FORMS THREE MAIN TYPES
1. HYPERBOLIC PARABOLOID
2. HYPERBOLOID OF REVOLUTION
3. HYPERBOLIC TRANSLATION (SHELL)
STRUCTURAL FORMS HYPERBOLIC PARABOLOID
STRUCTURAL FORMS HYPERBOLIC PARABOLOID
STRUCTURAL FORMS HYPERBOLOID OF REVOLUTION
STRUCTURAL FORMS HYPERBOLOID OF REVOLUTION
STRUCTURAL FORMS
SHELL TRANSLATION 1
STRUCTURAL FORMS SHELL TRANSLATION 2
STRUCTURAL FORMS SHELL TRANSLATION 3
STRUCTURAL FORMS SHELL TRANSLATION EXAM EXAMPLE
STRUCTURAL FORMS SHELL TRANSLATION EXAM EXAMPLE
OVERVIEW
SURFACE GEOMETRY
DIHEDRAL ANGLE
SURFACE GEOMETRY
SURFACE GEOMETRY
SURFACE GEOMETRY
SURFACE GEOMETRY
SURFACE GEOMETRY
SURFACE GEOMETRY
SURFACE GEOMETRY
SURFACE GEOMETRY
SURFACE GEOMETRY
SURFACE GEOMETRY
THIS QUESTION APPLIES TO CONIC SECTIONS ASWELL
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