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JUNIOR CERTIFICATE: TECHNICAL GRAPHICS NOTES

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The notes offer advice regarding the Irish Post-Primary Junior Certificate Technical Graphics examination. These notes are intended for study purposes only. Not all of the syllabus areas are represented in these notes.

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JUNIOR CERTIFICATE: TECHNICAL GRAPHICS NOTES

  1. 1. TECHNICAL GRAPHICS (T.G.) JUNIOR CERTIFICATE EXAMINATION REVISION NOTES 2017 MR. J. LYSTER PATRICIAN SECONDARY SCHOOL NEWBRIDGE, CO. KILDARE, REP. OF IRELAND. MAILTO: josephlyster@patriciansecondary.com JOSEPH LYSTER 2017 © EXCELLENCE IN TECHNICAL GRAPHICS
  2. 2. • A. EXAM GUIDANCE [GENERAL] 1. FORMAT 2. TIMING 3. SUGGESTED APPROACH • B. SHORT QUESTIONS 1. 2013 – 2016 • C. LONG QUESTION: LEARNING AREAS 1. FIRST PRINCIPLES (MULTIPLE AREAS) 2. ORTHOGRAPHIC PROJECTION WITH AUXILIARY 3. ROTATION OF OBJECTS 4. AXONOMETRIC PROJECTION 5. ISOMETRIC SCALE 6. DEVELOPMENT OF SURFACES / SOLIDS IN CONTACT 7. TRANSFORMATION GEOMETRY 8. ELLIPSE & PARABOLA 9. CIRCLES IN CONTACT • *NOT ALL SHORT QUESTION AREAS ARE COVERED IN THESE NOTES SO REFER TO EXAMPLES AS DONE IN CLASS AND IN EXAM PAPERS I.E. SKETCHING, TERMINOLOGY, C.A.D. COMMANDS, BAR/PIE/LINE CHARTS/GRAPHS ETC… CONTENTS
  3. 3. EXAM GUIDANCE FORMAT
  4. 4. EXAM GUIDANCE • FORMAT:  EXAM DURATION  HIGHER LEVEL = 3 HOURS  ORDINARY LEVEL = 2.5 HOURS  EXAM PAPER STRUCTURE  TWO SECTIONS IN EXAM PAPER  SECTION A = MIXED TOPIC SHORT QUESTIONS  FIFTEEN SHORT QUESTIONS (ANSWER ANY TEN – TRY ALL)  SECTION B = LONG QUESTIONS  SIX LONG QUESTIONS (ANSWER ANY FOUR) SEE TABLE BELOW TG PAPER SECTION B: LONG QUESTIONS QUESTION HIGHER LEVEL ORDINARY LEVEL 1 ORTHOGRAPHIC PROJECTION ORTHOGRAPHIC PROJECTION 2 ROTATION OF OBJECTS ELLIPSE 3 AXONOMETRIC/ ISOMETRIC SCALED DEVELOPMENTS 4 SOLIDS IN CONTACT & DEVELOPMENTS OBLIQUE & ISOMETRIC GRID DRAWING 5 TRANSFORMATION GEOMETRY TRANSFORMATION GEOMETRY 6 ELLIPSE, PARABOLA & CIRCLES IN CONTACT CIRCLES IN CONTACT
  5. 5. EXAM GUIDANCE • TIMING:  HIGHER LEVEL  3 HOURS (180 MINUTES)  SPEND 3 TO 5 MINUTES PREVIEWING EXAM PAPER AT START  SECTION A: RECOMMENDED TIME = 45 MINUTES MAX [35 MINUTES OR LESS WOULD BE IDEAL]  SECTION B: RECOMMENDED TIME = 130 MINUTES MAX (32.5 TO 35 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.  ORDINARY LEVEL  2.5 HOURS (150 MINUTES)  SPEND 3 TO 5 MINUTES PREVIEWING EXAM PAPER AT START  SECTION A: RECOMMENDED TIME = 25 TO 30 MINUTES MAX  SECTION B: RECOMMENDED TIME = 120 MINUTES MAX (30 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.
  6. 6. 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. MAKE SURE YOU HAVE ATTEMPTED AT LEAST 10 SHORT QUESTIONS THOUGH I DO RECOMMEND THAT YOU DO ALL FIFTEEN IF POSSIBLE.  MOVE ONTO SECTION ‘B’ AND AGAIN BEGIN WITH YOUR STRONGEST QUESTION, I.E. THE ONE YOU KNOW YOU CAN DO BEST IN THE LEAST AMOUNT OF TIME!  BE MINDFUL OF TIME…AS PREVIOUSLY MENTIONED.  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. IT CAN DO NO HARM TO HAVE A GO.  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.
  7. 7. EXAM GUIDANCE MAKE SURE YOU HAVE ALL OF THE REQUIRED DRAWING EQUIPMENT WITH YOU FOR THE EXAM!!! CHECKLIST  5H/2H/HB PENCILS  PENCIL PAIRER & RUBBER  MASKING TAPE/PAGE CLIPS  CALCULATOR (IF NEEDED)  BOW COMPASS (BRING SPARE COMPASS LED AND SAND PAPER)  45° AND 60° SET-SQUARES (ADJUSTABLE SET-SQUARE TOO IF DESIRED)  PROTRACTOR AND CIRCLE TEMPLATE  T-SQUARE
  8. 8. SHORT QUESTIONS MIXED TOPICS
  9. 9. SHORT QUESTIONS 2013
  10. 10. SHORT QUESTIONS 2014
  11. 11. SHORT QUESTIONS 2015
  12. 12. SHORT QUESTIONS 2016
  13. 13. LEARNING AREAS LONG QUESTIONS
  14. 14. OVERVIEW FIRST PRINCIPLES
  15. 15. FIRST PRINCIPLES
  16. 16. FIRST PRINCIPLES
  17. 17. FIRST PRINCIPLES
  18. 18. FIRST PRINCIPLES PENTAGON [360/5 = 72°] HEXAGON [360/6 = 60°] PENTAGON – 5 SIDED [ANGLE 360°/5 = 72°] HEXAGON – 6 SIDED [ANGLE 360°/6 = 60°] OCTAGON – 8 SIDED [ANGLE 360°/8 = 45°] 60º 45º
  19. 19. FIRST PRINCIPLES BISECTING A LINE [STEPS]
  20. 20. FIRST PRINCIPLES BISECTING AN ANGLE [STEPS]
  21. 21. FIRST PRINCIPLES 3 DIVIDING A LINE INTO AN EQUAL NUMBER OF PARTS https://www.youtube.com/watch?v=X_d61-dz9nY 1 2 3 A B A B A B 1 2 A B 3 1 2 A B 3 1 2 A B 1. 2. 6. 3. 5. 4.
  22. 22. FIRST PRINCIPLES
  23. 23. AREAS, ENLARGEMENT & REDUCTION
  24. 24. AREAS, ENLARGEMENT & REDUCTION Enlarge from ‘O’ to ‘A1’ Reduce irregular pentagon to scale of 2:3 Enlarge to 125mm length Inscribe square of maximum size into given triangle
  25. 25. AREAS, ENLARGEMENT & REDUCTION
  26. 26. OVERVIEW ORTHOGRAPHIC PROJECTION
  27. 27. ORTHOGRAPHIC PROJECTION END VIEW PLAN ELEVATION
  28. 28. ORTHOGRAPHIC PROJECTION
  29. 29. ORTHOGRAPHIC PROJECTION
  30. 30. ORTHOGRAPHIC PROJECTION
  31. 31. ORTHOGRAPHIC PROJECTION
  32. 32. 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
  33. 33. STANDARD AUXILIARY PROJECTION
  34. 34. STANDARD AUXILIARY PROJECTION
  35. 35. OVERVIEW ROTATION OF OBJECTS
  36. 36. ROTATION OF OBJECTS
  37. 37. ROTATION OF OBJECTS
  38. 38. ROTATION OF OBJECTS
  39. 39. ROTATION OF OBJECTS
  40. 40. ROTATION OF OBJECTS
  41. 41. ROTATION OF OBJECTS
  42. 42. ROTATION OF OBJECTS
  43. 43. ROTATION OF OBJECTS
  44. 44. ROTATION OF OBJECTS
  45. 45. OVERVIEW AXONOMETRIC PROJECTION
  46. 46. AXONOMETRIC PROJECTION TYPE 1: ISOMETRIC AXONOMETRIC PLANE IS AN EQUILATERAL TRIANGLE IN QUESTION ASSUME AS NORMAL
  47. 47. AXONOMETRIC PROJECTION ISOMETRIC
  48. 48. AXONOMETRIC PROJECTION ISOMETRIC
  49. 49. AXONOMETRIC PROJECTION ISOMETRIC
  50. 50. AXONOMETRIC PROJECTION ISOMETRIC
  51. 51. AXONOMETRIC PROJECTION ISOMETRIC
  52. 52. OVERVIEW SCALED ISOMETRIC
  53. 53. SCALED ISOMETRIC ISOMETRIC
  54. 54. SCALED ISOMETRIC ISOMETRIC
  55. 55. OVERVIEW DEVELOPMENTS & SOLIDS IN CONTACT (S.I.C.)
  56. 56. DEVELOPMENT & S.I.C.
  57. 57. DEVELOPMENT & S.I.C.
  58. 58. DEVELOPMENT & S.I.C.
  59. 59. DEVELOPMENT & S.I.C.
  60. 60. DEVELOPMENT & S.I.C.
  61. 61. DEVELOPMENT & S.I.C.
  62. 62. OVERVIEW TRANSFORMATION GEOMETRY
  63. 63. TRANSFORMATION GEOMETRY
  64. 64. TRANSFORMATION GEOMETRY RECOMMENDED STEPS: 1. READ THE QUESTION 2. POSITION START POINT IN TOP-LEFT AREA OF PAGE 3. DRAW THE FIGURE AND MAP OUT ALL POINTS, NAMELY P, P1, P2, P3, P4, AS DIRECTED. 4. FOLLOW THE INSTRUCTION FOR THE ORDER OF TRANSFORMATIONS AS OUTLINED IN THE QUESTION 1. P – P1 = AXIAL 2. P1 – P2 = CENTRAL 3. P2 – P3 = TRANSLATION 4. P3 – P4 = ROTATION CLOCKWISE 90°
  65. 65. OVERVIEW ELLIPSE AND PARABOLA
  66. 66. ELLIPSE AND PARABOLA ELLIPSE BY CONCENTRIC CIRCLES METHOD PARABOLA BY RECTANGLE METHOD ELLIPSE BY CONCENTRIC CIRCLES PARABOLA BY RECTANGLE METHOD
  67. 67. ELLIPSE AND PARABOLA
  68. 68. ELLIPSE AND PARABOLA ELLIPSE CONSTRUCTION OMITTED
  69. 69. ELLIPSE AND PARABOLA ELLIPSE CONSTRUCTION OMITTED
  70. 70. ELLIPSE AND PARABOLA ELLIPSE CONSTRUCTION OMITTED
  71. 71. ELLIPSE AND PARABOLA
  72. 72. ELLIPSE AND PARABOLA
  73. 73. OVERVIEW CIRCLES IN CONTACT
  74. 74. CIRCLES IN CONTACT
  75. 75. CIRCLES IN CONTACT
  76. 76. CIRCLES IN CONTACT
  77. 77. CIRCLES IN CONTACT
  78. 78. CIRCLES IN CONTACT

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