ENS 207 engineering graphics. Lecture 1: Introduction to engineering graphics. Information. Lecturer: Kemal Turan. Book. Engineering graphics with AutoCAD 2008 James D. Bethune PEARSON Additional material will be provided if necessary. Schedule
Lecture 1: Introduction to engineering graphics
1. Try to write a description of
2. Test your written description
by having someone attempt to make a sketch from your
can you easily understand that …?
Basic Knowledge for Drafting
Drawing standards are used so that drawings transmit
the same meaning to everyone who reads them.Standards
Standards are set of rules that govern how technicaldrawings are represented.
American National Standard Institute
International Standards Organization
The language is known as “drawing” or “drafting” .
A drawing can be done using freehand, instrumentsor computer.
Composition of Graphic Language
Graphic languagein “engineering application” use
linesto represent the surfaces, edges and contoursof objects.
The lines are sketched without using instruments other than pencils and erasers.
Instruments are used to draw straight lines, circles, and curves concisely and accurately. Thus, the drawings are usually made to scale.
The drawings are usually made by commercial software such as AutoCAD, solid works etc.
High-quality drawing pencils help produce good quality technical sketches and drawings.
The hard leads in this
group (left) are used
accuracy is required,
as on graphical
charts and diagrams.
The softer leads in this
group (right) are
sometimes used for
line work on
but their use is limited
because the lines are
apt to be too light.
These grades are for
general-purpose work in
technical drawing. The
softer grades (right) are
used for technical sketching,
and other freehand work
on mechanical drawings.
The harder leads (left) are
used for line work on
machine drawings and
architectural drawings. The
H and 2H leads are widely
used on pencil tracings for
These leads are too
soft to be useful in
They tend to produce
smudged, rough lines
that are hard to erase,
and the lead must be
These grades are used
for artwork of various
kinds, and for full-size
details in architectural
You might be surprised how much your drawings benefit from finding a style of pencil that suits your use. Soft pencils, such as HB or F, are mainly used in freehand sketching.
Choose a pencil that:
• Is soft enough to produce clear black lines, but hard enough not to
smudge (leke, mrlja) too easily.
• Is not so soft that the point breaks
• Feels comfortable in your hand.
• Grips the lead without slipping.
* May also be used as a vertical sheet size at 11" tall by 8.5" wide.