Post on 01-Apr-2015
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CHAPTER 3:Drafting Equipment
Mrs. KampfEngineering Graphics I
Drafting BoardDrawing sheet attached to it.9X12, 16X21 or 18X24Wood with vinyl coverStay flat and straight
T-SquareA head that lines up with a true
edge of the drafting boardStraightedge provides a true
edgeMetal, wood with plastic
TrianglesUsed with t-square45° has a 90° angle and two 45°30° -60° triangle has a 30° a 60°
and a 90°
ProtractorUsed to measure or lay out
anglesright, acute, obtuse
Irregular CurvesFrench curvesUsed to draw noncircular curves
like spirals and ellipses.
TemplatesSave time in drawing shapes of
details.
VellumTracing paper that has been
treated to make it more transparent.
ANSIAmerican National Standards
Institute
ISOInternational Standards
Organization
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”
Case instrumentsDrawing instruments that come
in a set.
DividersLines can be divided and
distances can be transferred with this
Bow and Friction-joint
CompassTrue circles or arcs can be drawn
with thisBow and Friction-joint
Bow instrumentsCan be adjusted with either a
center wheel or a side wheelEasy to use and accurate.
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
EraserVinyl erasers for film, kneaded,
pink pearl, gum, Magic rub
Erasing shieldUse to avoid erasing nearby lines
accidentallyPlastic or metal and have
different size and shape openings
ScalesInstruments used to lay off
distances and make measurements
Full size or some proportionScaled.
Architect’s scaleInch ScaleDivided into proportional feet’
and inches”Used for drawing buildings
Mechanical Engineer’s scaleInches and fractions of an inch
divided to represent inchesUse for drawing machine parts
Civil Engineer’s scaleInches divided into decimalsUnits could be inch, feet, miles
etcUsed for maps and drawings of
roads