Engineering graphics free hand sketch

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  • November 4, 2012
  • Engineering graphics free hand sketch

    1. 1. Engineering Graphics-Free Hand Sketch
    2. 2. Unit I Plane curves and Free hand sketchingCurves used in engineering practices: Conics – Construction of ellipse, parabola and hyperbola by eccentricity method – Construction of cycloid – construction of involutes of square, pentagon and circle - Drawing of tangents and normal to the above curves.Free hand sketching: Representation of Three Dimensional objects – Need for and importance of multiple views and their placement – Developing visualization skills through free hand sketching of multiple views from pictorial views of objects.
    3. 3. FIRST ANGLE FOR T.V. PROJECTION IN THIS METHOD,THE OBJECT IS ASSUMED TO BE SITUATED IN FIRST QUADRANT MEANS ABOVE HP & INFRONT OF VP. OBJECT IS INBETWEEN OBSERVER & PLANE. VP PP FV LSV . FO S.V RX Y R F.V FO . TV HP ACTUAL PATTERN OF PLANES & VIEWS INFIRST ANGLE METHOD OF PROJECTIONS
    4. 4. 1st ANGLE PROJECTION X OBSERVER 4
    5. 5. FOR T.V. ORTHOGRAPHIC PROJECTIONS ALL VIEWS IDENTICAL FV SV x y 10 . FO S.V R R F.VFO . 40PICTORIAL PRESENTATION IS GIVEN 40 TOP VIEW DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD
    6. 6. FOR T.V. ORTHOGRAPHIC PROJECTIONS FRONT VIEW L.H.SIDE VIEW FO R F.V . . S.V R FO x yPICTORIAL PRESENTATION IS GIVEN TOP VIEW DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD
    7. 7. FOR T.V. ORTHOGRAPHIC PROJECTIONS FRONT VIEW L.H.SIDE VIEW FO X Y . R S.V F.V R .FO TOP VIEW PICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD
    8. 8. FOR T.V. ORTHOGRAPHIC PROJECTIONS FRONT VIEW L.H.SIDE VIEW X Y S.V.FOR FO R F. V. PICTORIAL PRESENTATION IS GIVEN TOP VIEW DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD
    9. 9. FOR T.V. ORTHOGRAPHIC PROJECTIONS FRONT VIEW L.H.SIDE VIEW FO . R S.V F.V X Y R . FO TOP VIEWPICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD
    10. 10. FOR T.V. ORTHOGRAPHIC PROJECTIONS FRONT VIEW L.H.SIDE VIEW FO R F.V X Y . . S.V RFO TOP VIEW PICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD
    11. 11. FOR T.V. ORTHOGRAPHIC PROJECTIONS FRONT VIEW L.H.SIDE VIEW X Y . FO .V R S F.VFOR . PICTORIAL PRESENTATION IS GIVEN TOP VIEW DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD
    12. 12. FOR T.V. ORTHOGRAPHIC PROJECTIONS FRONT VIEW L.H.SIDE VIEW X Y . FO S.V R F.VFOR . TOP VIEW PICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD
    13. 13. FOR T.V. ORTHOGRAPHIC PROJECTIONS FRONT VIEW L.H.SIDE VIEW . S.V R FO FO R F.V X Y . TOP VIEWPICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD
    14. 14. FOR T.V. ORTHOGRAPHIC PROJECTIONS FRONT VIEW L.H.SIDE VIEW X Y FO . R .V F.V S .FOR TOP VIEW PICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD
    15. 15. FOR T.V. ORTHOGRAPHIC PROJECTIONS FRONT VIEW L.H.SIDE VIEW . FO X Y S.V R R F.VFO . TOP VIEW PICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD
    16. 16. General procedure for sketching orthographic views from pictorial view (isometric view):Step 1 : Sketch with free hand, the outline of all the required views with thin line (2H pencil).Step 2 : Sketch with free hand, all the visible lines and visible circles in all the required views with thin line (2H pencil).Step 3 : Sketch with free hand, all the hidden lines and hidden circles in all the required views with thin line (2H pencil).Step 4 : After checking for technical mistakes if any, darken (with free hand) all the visible lines, hidden lines, visible circles/arcs and hidden circles/arcs forming the required views with HB pencil.Step 5 : Lettering (both alphabets and numbers) should be done with free hand.c
    17. 17. An example :Make free-hand sketches of front, top and right side views of thepictorial view shown below.
    18. 18. Step 1 :
    19. 19. Step 2
    20. 20. Step 3 :
    21. 21. Step 4 :

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