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CHAPTER 3:Drafting Equipment
Mrs. KampfEngineering Graphics I
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Drafting BoardDrawing sheet attached to it.9X12, 16X21 or 18X24Wood with vinyl coverStay flat and straight
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T-SquareA head that lines up with a true
edge of the drafting boardStraightedge provides a true
edgeMetal, wood with plastic
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TrianglesUsed with t-square45° has a 90° angle and two 45°30° -60° triangle has a 30° a 60°
and a 90°
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ProtractorUsed to measure or lay out
anglesright, acute, obtuse
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Irregular CurvesFrench curvesUsed to draw noncircular curves
like spirals and ellipses.
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TemplatesSave time in drawing shapes of
details.
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VellumTracing paper that has been
treated to make it more transparent.
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ANSIAmerican National Standards
Institute
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ISOInternational Standards
Organization
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PaperSize A - Letterhead 8.5” X 11”Size B - Tabloid 11” X 17”Size C - 17” x 22”Size D - 22” X 34”Size E - 34” X 44”
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Case instrumentsDrawing instruments that come
in a set.
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DividersLines can be divided and
distances can be transferred with this
Bow and Friction-joint
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CompassTrue circles or arcs can be drawn
with thisBow and Friction-joint
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Bow instrumentsCan be adjusted with either a
center wheel or a side wheelEasy to use and accurate.
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Graphite pencils17 degrees of hardness or gradesGrade you use depends on paper
type, line weight and darkness of lines made
6B to 9H, #2/HB is middleHardness, Blackness, Fine Point
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EraserVinyl erasers for film, kneaded,
pink pearl, gum, Magic rub
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Erasing shieldUse to avoid erasing nearby lines
accidentallyPlastic or metal and have
different size and shape openings
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ScalesInstruments used to lay off
distances and make measurements
Full size or some proportionScaled.
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Architect’s scaleInch ScaleDivided into proportional feet’
and inches”Used for drawing buildings
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Mechanical Engineer’s scaleInches and fractions of an inch
divided to represent inchesUse for drawing machine parts
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Civil Engineer’s scaleInches divided into decimalsUnits could be inch, feet, miles
etcUsed for maps and drawings of
roads