CLASS 7 Review: -Axonometric/Oblique Projections -Isometric Projection -Isometric
CLASS 7 Review: -Axonometric/Oblique Projections -Isometric Projection -Isometric view from multiview drawing Lab: -Sketching missing lines p.125. Turn in for grading at the beginning of class 9. (2 grades) -On A format draw an isometric view of on object from multiview drawing 54 (a) 1. Turn in for grading at the beginning of class 9.(06/13) Home work: - Study for Midterm Exam. Sketching missing lines p.125. Part 1. Find missing lines and draw them.
Part 2. On isometric grid paper draw an isometric view of each object. On A format draw an isometric view of on object from multiview drawing 54 (a) 1 Axonometric & Oblique Projection Axonometric Projection Type of axonometric drawing Axonometric axis a
1. Isometric A A C b B B D D
All angles are equal. c Axonometric axis a 2. Dimetric Two angles are equal. c
b C Axonometric axis a 3. Trimetric b c
None of angles are equal. Oblique Projection Parallel & oblique to picture plane A Line of sight A
B B C C D D Oblique Projection Oblique drawing angle 60o
All edges foreshorten about 0.8 time. Isometric Drawing Isometric drawing is a drawing drawn on an isometric axes using full scale. Isometric projection (True projection) Isometric drawing (Full scale) Forshorten Full scale
Positions of Isometric Axes Isometric axes can be arbitrarily positioned to create different views of a single object. Regular isometric Reverse axis isometric Long axis isometric View point is looking
down on the top of the object. View point is looking up on the bottom of the object. View point is looking from the right (or left) of the object. Distance in Isometric Drawing True-length distances are shown along isometric lines.
Isometric line is the line that run parallel to any of the isometric axes. Nonisometric lines Isometric axes Isometric Sketching Sketch from an actual object 1. Place the object in the position which its shape and features are clearly seen. 2. Define an isometric axis. 3. Sketching the enclosing box.
4. Estimate the size an and relationship of each details. 5. Darken all visible lines. Sketch from an actual object STEPS 1. Positioning object. 2. Select isometric axis. 3. Sketch enclosing box. 4. Add details. 5. Darken visible lines. Sketch from an actual object STEPS
1. Positioning object. 2. Select isometric axis. 3. Sketch enclosing box. 4. Add details. 5. Darken visible lines. Note In isometric sketch/drawing), hidden lines are omitted unless they are absolutely necessary to completely describe the object. Sketch from multiview drawing 1. Interprete the meaning of lines/areas in multiview drawing. 2. Locate the lines or surfaces relative to isometric
axis. Example 1 : Object has only normal surfaces Top Regular Top View H Front Side
W W Bottom View Side View H Front View D
D Reverse Front Side Bottom D Example 2 : Object has inclined surfaces
Nonisometric line y H y x Front View
x W Example 3 : Object has inclined surfaces x C x B A B
x x A y C y C B A
Nonisometric line Example 4 Regular x y C D B B
F Front View A C A E Reverse
D F E Circle & Arc in Isometric In isometric drawing, a circle appears as an ellipse. Sketching Steps 1. Locate the centre of an ellipse. 2. Construct an isometric square. 3. Sketch arcs that connect the tangent points. Circle & Arc in Isometric
Four-centre method is usually used when drawn an isometric ellipse with drawing instrument. Sketching Steps 1. Locate the centre of an ellipse. 2. Construct an isometric square. 3. Construct a perpendicular bisector from each tangent point. 4. Locate the four centres. 5. Draw the arcs with these centres and tangent to isometric square. Example 5 Irregular Curve in Isometric
Steps 1. Construct points along the curve in multiview drawing. 2. Locate these points in the isometric view. 3. Sketch the connecting lines.
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