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Engineering Graphics_ ME-101_P8_15-06-21.pptx
- 1. Engineering Graphics_ ME-101 NIT Hamirpur by Dr. Somnath Dey, Ph.D. (IIT Bombay)
- 2. Isometric projection Pictorial representation of a 3D solid in one view. The actual sizes can be measured directly from the view. Isometric axes. Isometric lines. Isometric planes. Isometric scale. 1 2 cos30 3 BA BO 1 2 cos45 1 BP BO 2 9 0.815 3 11 BA BP
- 3. Isometric scale The lines which are not to the isometric axes are not reduced according to any fixed ratio. Such lines are called non-isometric lines.
- 4. Isometric view The view drawn with the true scale is called isometric view or isometric drawing. The view drawn with the isometric scale is called isometric projection. Each horizontal face will have its sides to the to sloping axes. Each vertical face will have its vertical sides to the vertical axis and the other sides to one of the sloping axes.
- 5. Isometric drawing of planes The front view of a square is given. Draw its isometric view.
- 6. Isometric drawing of planes The top view of a square is given. Draw its isometric view.
- 7. Isometric drawing of planes The front view of a hexagon whose surface is to the V. P. is given. Draw its isometric view. Box method
- 8. Isometric drawing of planes The front view of a circle whose surface is to the V. P. is given. Draw its isometric view. Method of points
- 9. Isometric drawing of planes The front view of a circle whose surface is to the V. P. is given. Draw its isometric view. Four-centre method
- 10. Isometric drawing of planes The front view of a semi-circle whose surface is to the V. P. is given. Draw its isometric view.
- 11. Isometric drawing of planes Figure below shows the F. V. of a plane to the V. P. Draw its isometric view.
- 12. Isometric drawing of prisms and pyramids Draw the isometric view of a square prism, side of the base 20 mm long and axis 40 mm long, when its axis is vertical.
- 13. Methods of drawing non-isometric lines Three views of a block are given. Draw its isometric view. Box method
- 14. Methods of drawing non-isometric lines Co-ordinate or offset method: Used for objects in which neither non-isometric lines nor their ends lie in isometric planes. ヰ s are dropped from each end of the edge to a horizontal or vertical reference plane. The points at which the ヰ s meet the plane, are located by drawing co-ordinates or offsets to the edges of the plane.
- 15. Co-ordinate or offset method Draw the isometric view of the truncated triangular pyramid shown below.
- 16. The orthographic projections of an object is given below. Draw the isometric view of the object.