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Drafting Terminology: A Comprehensive Glossary for Technical Drawing, Exams of Social Sciences

United States International UniversitySocial Sciences

A comprehensive glossary of terms and definitions related to drafting, covering fundamental concepts, tools, and techniques used in technical drawing. It includes terminology related to measurements, scales, geometric constructions, cad software, and various types of lines and their applications. This resource is valuable for students and professionals in engineering, architecture, and design fields, offering a quick reference guide to essential drafting knowledge. It enhances understanding of drafting principles and improves communication in technical documentation. The document also covers drafting machine types, memory units, and geometric shapes.

Typology: Exams

2024/2025

Available from 08/16/2025

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ADDA DRAFTING CERTIFICATION: COMPETENCY
1(GENERAL TERMINOLOGY)
centimeters - Answer -1/100th of a meter
millimeters - Answer -1/1000ths of a meter
meter - Answer -basis for metric system; = to 100 cm, 1000mm, 10 dm, etc.
decimeter - Answer -1/10th of a meter
American Society of Mechanical Engineers - Answer -ASME
dekameter - Answer -10 meters
kilometer - Answer -100 dekameters; 1000 meters
25.4 - Answer -millimeters per inch
fraction - Answer -part of a whole, such has 1/2 or 1/4
1:2 - Answer -half scale
2:1 - Answer -double size
drawn to scale - Answer -drawing an object to a set proportion
metric system - Answer -decimal system of wights and measures based on the meter
and the kilogram; SI (international system) linear unit is millimeter
lettering - Answer -single stroke gothic; TOM Q. VAXY is all the letters that are as tall
as they are wide; drawn w/HB
foreshortened - Answer -surfaces do not give a clear or accurate representation of the
size or shape of the surface or features and should not be dimensioned; lines and
surfaces that are inclined to the picture plane appear this way
bisecting - Answer -dividing into two equal parts; drawn by setting compass length
greater than half of line's length and striking arc w/center at each endpoint, then drawing
a line perpendicular to the original line through the point where the arcs crossed
equilateral - Answer -all side lengths are equal
concentric - Answer -having a common center
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ADDA DRAFTING CERTIFICATION: COMPETENCY

1(GENERAL TERMINOLOGY)

centimeters - Answer - 1/100th of a meter millimeters - Answer - 1/1000ths of a meter meter - Answer - basis for metric system; = to 100 cm, 1000mm, 10 dm, etc. decimeter - Answer - 1/10th of a meter American Society of Mechanical Engineers - Answer - ASME dekameter - Answer - 10 meters kilometer - Answer - 100 dekameters; 1000 meters 25.4 - Answer - millimeters per inch fraction - Answer - part of a whole, such has 1/2 or 1/ 1:2 - Answer - half scale 2:1 - Answer - double size drawn to scale - Answer - drawing an object to a set proportion metric system - Answer - decimal system of wights and measures based on the meter and the kilogram; SI (international system) linear unit is millimeter lettering - Answer - single stroke gothic; TOM Q. VAXY is all the letters that are as tall as they are wide; drawn w/HB foreshortened - Answer - surfaces do not give a clear or accurate representation of the size or shape of the surface or features and should not be dimensioned; lines and surfaces that are inclined to the picture plane appear this way bisecting - Answer - dividing into two equal parts; drawn by setting compass length greater than half of line's length and striking arc w/center at each endpoint, then drawing a line perpendicular to the original line through the point where the arcs crossed equilateral - Answer - all side lengths are equal concentric - Answer - having a common center

180º - Answer - number of degrees in a triangle 360º - Answer - number of degrees in a circle [and quadrilateral] quadrant - Answer - one of four sections into which the coordinate plane is divided (and/or a circle) revision block - Answer - placed in upper righthand corner of page; brief listing of revisions made to a drawing since it was initially released to manufacture, includes revision zone, letter, date, and name of revisor and revising checker surface finish mark - Answer - can appear as checkmark, check with micron- smoothness number in it, a V, or an S with a line through it where it intersects the object line; indicates surfaces that are machine finished 8.5" x 11" - Answer - A-size layout 11" x 17" - Answer - B-size layout 17" x 22" - Answer - C-size layout 22" x 34" - Answer - D-size layout 34" x 44" - Answer - E-size layout 28" x 40" - Answer - F-size layout beam compass - Answer - compass where arm is extended by beam; allows large circles to be drawn two-bevel scale - Answer - scale where cross-section looks like trapezoid four-bevel scale - Answer - scale where cross-section looks like elongated hexagon opposite-bevel scale - Answer - scale where cross-section looks like parallelogram triangular scale - Answer - scale where cross-section looks like three-point star or throwing star; most common used v-type drafting machine - Answer - took place of t-squares along with elbow-type elbow-type drafting machine - Answer - took place of t-squares along with v-type 1 bite - Answer - smallest amount of memory in computer

ellipse - Answer - a foreshortened circle having a major and a minor axis 60 - Answer - number of minutes in a degree 60 - Answer - number of seconds in a minute of a degree counterdrill - Answer - to form a conical shoulder in a drilled hole by enlarging it with a larger drill countersink - Answer - to recess a hole with a cone-shaped tool to provide a seat for a flathead screw drill - Answer - a tool with a conical point used to machine holes in a part ream - Answer - to enlarge a hole to a more accurate size AND surface finish tap - Answer - tool used to cut internal threads die - Answer - tool used to cut external threads rhombus - Answer - parallelogram with four congruent sides rhomboid - Answer - a quadrilateral of which only the opposite sides and angles are equal square - Answer - quadrilateral with four congruent sides and congruent angles; internal angles 360º rectangle - Answer - quadrilateral with four congruent angles parallelogram - Answer - quadrilateral with two pairs of parallel sides hexagon - Answer - polygon with six sides; internal angles add up to 720º pentagon - Answer - polygon with five sides; internal angles add up to 540º heptagon - Answer - polygon with seven sides; internal angles add up to 900º octagon - Answer - polygon with eight sides; internal angles add up to 1080º nonagon - Answer - polygon with nine sides; internal angles add up to 1260º decagon - Answer - polygon with ten sides; internal angles add up to 1440º hard drive - Answer - saving component of CAD; computer hardware that holds and spins a magnetic or optical disk and reads and writes information on it

plotter - Answer - output device; sophisticated printers used to produce high quality drawings such as blueprints, maps, and circuit diagrams input devices - Answer - keyboard, mouse, etc. that are needed to externally control various features on the computer output devices - Answer - monitor, printer, plotter; receives signal from the computer in order to complete various tasks such as printing, playing sound or displaying graphics graphics card - Answer - video card; controls how/what you see on a computer and how it looks wire frame - Answer - 3D object with connecting lines with no surfaces shown CPU - Answer - central processing unit; interprets and carries out the basic instructions that operate a computer true size - Answer - A surface that is shown in its actual size if a plane is parallel to the plane of projection RAM - Answer - random access memory ROM - Answer - read-only memory leader line - Answer - lines that are unbroken, thin (.3mm) and used to connect a specific note to a feature (esp. with arrow and for circles; no precedence (note line)) centerline - Answer - thin lines (.3mm) consisting of alternate long and short dashes, forming a 3mm cross in the center of circles and should extend 8mm outside the feature; represent centers of circles or arcs, and axis of symmetry, or a path of motion; has precedence over hidden lines dimension line - Answer - thin lines (.3mm) terminated with uniformly sized arrowheads used to indicate extend and direction on dimension; MAY NEVER BE CROSSED visible object line - Answer - thick line (.6mm) that represents visible eyes or contours of the part; has precedence over everything but cutting-plane lines border line - Answer - thick line (.6mm) used to indicate edge of drawn space, review block, title block,etc extension line - Answer - thin lines (.3mm) spaced 1.5 mm away from the feature been dimensions and 3mm past arrowhead of dimension; used to indicate the point or line to which the dimension applies

diameter - Answer - A straight line passing from side to side through the center of a circle or sphere. circumference - Answer - Distance around the circle trapezium - Answer - quadrilateral where no two sides are parallel eccentric - Answer - not sharing a common center tangent [line or arc] - Answer - A line or arc in the plane of a circle that intersects the circle in exactly one point. scalene triangle - Answer - a triangle with no congruent sides (and thus no congruent angles) isosceles triangle - Answer - a triangle with two congruent sides (and thus two congruent angles) equilateral triangle - Answer - a triangle with all sides congruent (and thus all angles congruent) parallel lines - Answer - lines in the same plane that never intersect complimentary angles - Answer - Two angles that add up to 90 degrees supplementary angles - Answer - Two angles whose sum is 180 degrees radius - Answer - A straight line from the center to the circumference of a circle or sphere. sector - Answer - Area of section of a circle with a central angle at the center perpendicular lines - Answer - lines that intersect at ninety degrees straight line - Answer - shortest distance between two points dodecagon - Answer - polygon with twelve sides