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Engineering Graphics-Free Hand sketch

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    Engineering Graphics-Free Hand sketch Engineering Graphics-Free Hand sketch Presentation Transcript

    • Engineering Graphics-Free Hand Sketch By Mr.B.Ramesh, M.E ., (Ph.D.), Research Scholar, CEG, Anna University, Chennai. Associate Professor, Department of Mechanical Engineering,, St. Joseph’s College of Engineering, Jeppiaar Trust, Chennai-119
    • Syllabus : Unit I Plane curves and Free hand sketching (18) Curves 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.
    • FOR T.V. FOR S.V. FOR F.V. FIRST ANGLE 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. ACTUAL PATTERN OF PLANES & VIEWS IN FIRST ANGLE METHOD OF PROJECTIONS X Y VP HP PP FV LSV TV
    • 1st ANGLE PROJECTION OBSERVER X
    • FOR T.V. FOR S.V. FOR F.V. PICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD ORTHOGRAPHIC PROJECTIONS x y FV SV ALL VIEWS IDENTICAL 40 40 10 TOP VIEW
    • x y FRONT VIEW TOP VIEW L.H.SIDE VIEW FOR F.V. FOR S.V. FOR T.V. PICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD ORTHOGRAPHIC PROJECTIONS
    • FOR F.V. FOR S.V. FOR T.V. X Y FRONT VIEW TOP VIEW L.H.SIDE VIEW ORTHOGRAPHIC PROJECTIONS PICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD
    • FOR T.V. FOR S.V. FOR F.V. PICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD ORTHOGRAPHIC PROJECTIONS FRONT VIEW TOP VIEW L.H.SIDE VIEW X Y
    • FOR F.V. FOR S.V. FOR T.V. ORTHOGRAPHIC PROJECTIONS X Y FRONT VIEW TOP VIEW L.H.SIDE VIEW PICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD
    • FOR T.V. FOR S.V. FOR F.V. PICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD ORTHOGRAPHIC PROJECTIONS FRONT VIEW TOP VIEW L.H.SIDE VIEW X Y
    • FOR T.V. FOR S.V. FOR F.V. PICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD ORTHOGRAPHIC PROJECTIONS FRONT VIEW TOP VIEW L.H.SIDE VIEW X Y
    • FOR T.V. FOR S.V. ORTHOGRAPHIC PROJECTIONS FOR F.V. FRONT VIEW TOP VIEW L.H.SIDE VIEW X Y PICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD
    • FOR T.V. FOR F.V. FOR S.V. ORTHOGRAPHIC PROJECTIONS FRONT VIEW TOP VIEW L.H.SIDE VIEW X Y PICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD
    • FOR T.V. FOR F.V. FOR S.V. PICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD ORTHOGRAPHIC PROJECTIONS FRONT VIEW TOP VIEW L.H.SIDE VIEW X Y
    • FOR T.V. FOR F.V. FOR S.V. ORTHOGRAPHIC PROJECTIONS FRONT VIEW TOP VIEW L.H.SIDE VIEW X Y PICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD
    • 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.
    • An example :   Make free-hand sketches of front, top and right side views of the pictorial view shown below.
    • Step 1 :
    • Step 2
    • Step 3 :
    • Step 4 :
    • Step 5 :