This document defines technical drawing and its standards. It discusses the classifications of drawings such as artistic and technical. It also describes different drawing media and methods of reproduction like diazo, blueprints, microfilming, xerography and photostatting. The document outlines the engineering alphabet and guidelines for lettering. It explains sketching techniques and instrumental drawing tools like the drawing table, T-square, scale, compass and templates. Geometric figures and polygons are also defined. References are provided at the end.

1. Mini Paper DRAW 110L (Engineering Drawing I)
By: John Paul Espino
De La Salle University – Dasmarinas
Facebook.com/Johnpaul.dss

3. Definitions of Technical Drawing
and its Standard
3
John Paul B. Espino IEE12
M 0700 – 1000
DRAW110L
• The practice or skill of
delineating objects in a precise
way using certain techniques of
draftsmanship, as employed in
architecture or engineering.
• Standards - ISO "A series"

4. Classifications of Drawings4
John Paul B. Espino IEE12
M 0700 – 1000
DRAW110L
• Artistic Drawing
• Technical Drawing

5. Drawing Media and Reproduction5
John Paul B. Espino IEE12
M 0700 – 1000
DRAW110L
• Diazo - a copying or coloring process using a diazo
compound decomposed by ultraviolet light.
• Blueprints - a design plan or other technical drawing.
• Microfilming - a length of film containing
microphotographs of a newspaper, catalog, or other
document.
• Xerography - a dry copying process in which black or
colored powder adheres to parts of a surface
remaining electrically charged after being exposed to
light from an image of the document to be copied.
• Photostatting - PHOTOSTAT. : a device for making a
photographic copy of graphic matter; also : a copy
made by this device.

6. Engineering Alphabet6
John Paul B. Espino IEE12
M 0700 – 1000
DRAW110L
• Guidelines and letter proportion – all letters
should be in the same height, proportion and
inclination.
• Common Errors

7. Sketching Techniques7
John Paul B. Espino IEE12
M 0700 – 1000
DRAW110L
• The best pencil for lettering on most surfaces are the H, F, and HB
grades.
• Hold your pencil in the position shown. It should make approximately
a 60o angle with the paper.
Pencil Techniques

8. Instrumental Drawing8
John Paul B. Espino IEE12
M 0700 – 1000
DRAW110L
• Drawing Table - is, in its antique form, a kind of
multipurpose desk which can be used for any
kind of drawing, writing or impromptu
sketching on a large sheet of paper or for reading
a large format book or other oversized document
or for drafting precise.
•
• T- square - a T-shaped instrument for drawing or
testing right angles.
• Metric scale - is the system of measurement used
in the metric system.
• Triangles (45x45, 60x30 scale) - A three-
sided ruler, typically has two equal sides which
meet at a 90 degree angle joined to a third side at
a 45 degree angle. Used to identify true bias lines
or to square a corner.

9. Instrumental Drawing9
John Paul B. Espino IEE12
M 0700 – 1000
DRAW110L
• Compass - an instrument for drawing circles and arcs and measuring
distances between points, consisting of two arms linked by a movable joint, one
arm ending in a point and the other usually carrying a pencil or pen.
• Pencil - an instrument for writing or drawing, consisting of a thin stick of
graphite or a similar substance enclosed in a long thin piece of wood or fixed in
a metal or plastic case. The best pencil for instrumental drawing on most
surfaces are the H, F, and HB grades.
• Mechanical Pencil - a pencil with a plastic or metal case and a thin
replaceable lead that may be extended as the point is worn away by twisting the
outer casing.
• Irregular Curve - is a set of pixels that define a curve that does not fit the
perimeter of a conic section.

10. Instrumental Drawing10
John Paul B. Espino IEE12
M 0700 – 1000
DRAW110L
• Templates - a shaped piece of metal, wood, card, plastic, or other material
used as a pattern for processes such as painting, cutting out, shaping, or
drilling.
• Technical Pen - is a specialized instrument used by an engineer, architect,
or drafter to make lines of constant width for architectural, engineering,
or technical drawings. A "rapidograph" pen is a trademarked name for one
type of technical pen.

11. Instrumental Drawing11
John Paul B. Espino IEE12
M 0700 – 1000
DRAW110L
• Drawing Paper - a paper specially prepared for the use of
drawers (such as draftsmen or sketchers).
• Dusting Brush - a brush used for dusting.
• Drafting machine - is a tool used in technical drawing, consisting
of a pair of scales mounted to form a right angle on an articulated
protractor head that allows an angular rotation.

12. Instrumental Drawing12
John Paul B. Espino IEE12
M 0700 – 1000
DRAW110L
• Geometric figures/ Polygons - is a
plane figure that is bounded by a finite
chain of straight line segments closing in a
loop to form a closed chain or circuit. These
segments are called its edges or sides, and
the points where two edges meet are
thepolygon's vertices (singular: vertex) or
corners.

13. References
13
John Paul B. Espino IEE12
M 0700 – 1000
DRAW110L
• www.m-w.com
• Google Search Definitions
• wikieducator.org/images/9/9c/FT101.pdf
• web.aeromech.usyd.edu.au
• https://www.google.com.ph/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=technical+drawing+deifinition
• https://www.google.com.ph/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0CCIQFjABahUKEwi1suKi
0fTHAhWWf5IKHZgsCBo&url=http%3A%2F%2Fwww.merriam-webster.com
• https://www.google.com.ph/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0CAcQjRxqFQoTCPG0l
LPB9McCFYMVkgodkoQKSQ&url=http%3A%2F%2Fwww.mclarenelectronics.com
• https://www.google.com.ph/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CB8QFjAAahUKEwix1JL
b1vTHAhUPFpIKHTCdDvU&url=http%3A%2F%2Fwww.vcaa.vic.edu.au
Bibliography
John Paul Bacolod Espino (March 19, 1998) is a 16 years old male Filipino student, son of Corazon B. Espino
and Diosdado B. Espino. He graduated in Maddalena Starace School Elementary (2011) and Highschool at
2015.

14. References
 https://www.google.com.ph/webhp?sourceid=chrome-
instant&ion=1&espv=2&ie=UTF-8#q=technical+drawing+deifinition
 https://www.google.com.ph/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad
=rja&uact=8&ved=0CCIQFjABahUKEwi1suKi0fTHAhWWf5IKHZgsCBo&url=http%3
A%2F%2Fwww.merriam-
webster.com%2Fdictionary%2Fdrawing%2520paper&usg=AFQjCNGPQ3pW6oeRk
RNtxo_00j9c1yn_rg&bvm=bv.102537793,d.aWw
 https://www.google.com.ph/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&ca
d=rja&uact=8&ved=0CAcQjRxqFQoTCPG0lLPB9McCFYMVkgodkoQKSQ&url=http
%3A%2F%2Fwww.mclarenelectronics.com%2FProducts%2FProduct%2FTyre%2520
Pressure%2520Receiver&bvm=bv.102537793,d.aWw&psig=AFQjCNF0NlICMqJmoj
EYKx9vWbS_f-2wmA&ust=1442250889262076
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