Design web ME 1110 – Engineering Practice 1 Engineering Drawing and Design - Lecture 3 Pictorial projections Prof Ahmed Kovacevic School of Engineering and Mathematical Sciences Room CG25, Phone: 8780, E-Mail: [email protected] www.staff.city.ac.uk/~ra600/intro.htm 1 Ahmed Kovacevic, City University London Design web Objectives for today How to represent a 3-D object effectively on a 2-D drawing surface with a single view (pictorials) How to generate pictorials using only hand drawing tools Recognize types of pictorials 2 Ahmed Kovacevic, City University London Design web Exercise DrE-2 for this week 3 Ahmed Kovacevic, City University London Design web 4 Ahmed Kovacevic, City University London Design web 5 Ahmed Kovacevic, City University London Design web Pictorials Definition: A sketch developed for ease of visualization that shows an objects height, width, and depth in a single view Particularly useful for non-technical audiences » Pictorials are generally not dimensioned » Surfaces are often shaded » Hidden lines are not shown Helpful in the ideation phase of design May be easily drawn with CAD programs 6 Ahmed Kovacevic, City University London Design web Pictorials Parallel Projection » Oblique Pictorials – Parallel projectors are not perpendicular to the projection plane » Axonometric Pictorials – Projection lines are perpendicular to the projection plane as in a multiview drawing – Example is Isometric Perspective Projection » Conveys information about distance and size » Not as common as parallel projection 7 Ahmed Kovacevic, City University London Design web Pictorials 8 Ahmed Kovacevic, City University London Design web Axonometric views 9 Ahmed Kovacevic, City University London Design web Theory of isometric projection 10 Ahmed Kovacevic, City University London Design web Isometric projection - drawing 11 Ahmed Kovacevic, City University London Design web Size 12 Ahmed Kovacevic, City University London Design web Positions of isometric axes and their effect on the view created 13 Ahmed Kovacevic, City University London Design web Isometric and non-isometric lines 14 Ahmed Kovacevic, City University London Design web An isometric drawing Hidden lines are usually not shown 15 Ahmed Kovacevic, City University London Design web The basic steps used to create an isometric sketch of an object 16 Ahmed Kovacevic, City University London Design web Isometric representation of circles 17 Ahmed Kovacevic, City University London Design web 18 Ahmed Kovacevic, City University London Design web Steps used to construct a sketch of an isometric cylinder 19 Ahmed Kovacevic, City University London Design web Steps used to construct a sketch of a semi-ellipse 20 Ahmed Kovacevic, City University London Design web Angles and irregular shapes in an isometric sketch 21 Ahmed Kovacevic, City University London Isometric Assembly Drawing Design web 22 Ahmed Kovacevic, City University London Design web Oblique projection 23 Ahmed Kovacevic, City University London Design web Types and angles of oblique projections 24 Ahmed Kovacevic, City University London Design web How to generate oblique projection The construction of an oblique sketch is a multistep process that begins by boxing in the front view, adding details, and then boxing in the depth dimension 25 Ahmed Kovacevic, City University London Design web Yes and No for oblique projections 26 Ahmed Kovacevic, City University London Design web Perspective projections 27 Ahmed Kovacevic, City University London Design web Vanishing point 28 Ahmed Kovacevic, City University London Design web Horizon line position 29 Ahmed Kovacevic, City University London Design web How to create a one point perspective? 30 Ahmed Kovacevic, City University London Design web Exercise DrE-2 31 Ahmed Kovacevic, City University London.