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ME 101ME 101
ENGINEERING GRAPHICSENGINEERING GRAPHICS
The University of GaziantepThe University of Gaziantep Faculty of EngineeringFaculty of Engineering
ENGINEERING GRAPHICSENGINEERING GRAPHICS
Dr. Oğuzhan YILMAZDr. Oğuzhan YILMAZ ((Assist.ProfAssist.Prof..))Mechanical Engineering Department
Room: 319oyilmaz@gantep.edu.tr
http://www.gantep.edu.tr/~oyilmaz
Orthographic ProjectionOrthographic Projection & & Auxiliary ViewsAuxiliary Views
Introduction and Objectives
ME 101ME 101Orthographic ProjectionOrthographic Projection
� This lecture introduces how to visualize an object from its orthographic
views.
� To do so, methods, procedure and the meaning of basic features are
explained in detail.
� Students are required to understand and practice to visualize an object
Dr. Oğuzhan Yılmaz
� Students are required to understand and practice to visualize an object
using with given orthographic views and to gain an ability of reversal
drawing of an object and drawing of missing views.
Orthographic Reading & Prerequisites of Reading
ME 101ME 101Orthographic ProjectionOrthographic Projection
� Orthographic reading is a meaning of understand the language of technical drawing.
� Reading a drawing is the process of recognizing and applying the principles of orthographic projection to interpret the shape of an object from the orthographic
views.
Dr. Oğuzhan Yılmaz
� Before reading a drawing, the one should familiar with the principles of
orthographic projection:
� Arrangement of views and their projection
� The location of height, width and depth
� What line, surface and plane represent etc.
ME 101ME 101Orthographic ProjectionOrthographic Projection
Orthographic Reading & Prerequisites of Reading
Dr. Oğuzhan Yılmaz
Top
First-Angle Projection
Procedure of Reading
ME 101ME 101Orthographic ProjectionOrthographic Projection
� Orient yourself with the given views
� Obtain a general idea of the over-all shape of the object. Focus on the dominant
features and their relations to one another.
� Start reading the simpler individual features. Look at all views carefully.
� Read the unfamiliar or complicated features. Remember that every point, line,
Dr. Oğuzhan Yılmaz
� Read the unfamiliar or complicated features. Remember that every point, line,
surface and solids appear in every views and you must find the projection of each in
the views.
� While reading, relationship between the various portions or elements of the object.
Such items are the number and spacing the holes, placement of ribs, tangency of
surfaces, and the proportions of hubs etc. and they all be remembered and noted.
� All views must be read carefully.
The Meaning of Lines
ME 101ME 101Orthographic ProjectionOrthographic Projection
A line on a drawing indicates:
1. The edge view of a surface
2. An intersection of two surfaces
3. A surface limit
Dr. Oğuzhan Yılmaz
� A line on a view may mean any one of these three conditions.
� The corresponding part of another view must be examined to determine the
meaning.
The Meaning of Lines
ME 101ME 101Orthographic ProjectionOrthographic Projection
Dr. Oğuzhan Yılmaz
The meaning of areas
ME 101ME 101Orthographic ProjectionOrthographic Projection
� Area can be defined as the contour limits of a surface or combination of tangent
surfaces as seen in different orthographic views.
Dr. Oğuzhan Yılmaz
The meaning of areas in projection
ME 101ME 101Orthographic ProjectionOrthographic Projection
Dr. Oğuzhan Yılmaz
The meaning of areas in projection
ME 101ME 101Orthographic ProjectionOrthographic Projection
Dr. Oğuzhan Yılmaz
The meaning of areas
ME 101ME 101Orthographic ProjectionOrthographic Projection
Dr. Oğuzhan Yılmaz
The meaning of areas
ME 101ME 101Orthographic ProjectionOrthographic Projection
Dr. Oğuzhan Yılmaz
Reading corners and edges
ME 101ME 101Orthographic ProjectionOrthographic Projection
Fro
nt
Dr. Oğuzhan Yılmaz
Fro
nt
Top
Reading corners and edges
ME 101ME 101Orthographic ProjectionOrthographic Projection
Dr. Oğuzhan Yılmaz
Reading corners and edges
ME 101ME 101Orthographic ProjectionOrthographic Projection
Dr. Oğuzhan Yılmaz
Reading corners and edges
ME 101ME 101Orthographic ProjectionOrthographic Projection
� A cylinder will appear
as a circle in one view
and a rectangular
shape the other two
views.
Dr. Oğuzhan Yılmaz
Learning to read by sketching and modeling
ME 101ME 101Orthographic ProjectionOrthographic Projection
A drawing is interpreted by mentally understanding the shape of the object represented.
Dr. Oğuzhan Yılmaz
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