CHAPTER 3: Drafting Equipment Mrs. Kampf Engineering Graphics I

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