Career & Technical

Education

Basic Drafting Skills

003.03

Demonstrate correct drawing procedures

Aligning & Taping Paper

Align paper on parallel edge (or T-square) Fasten top two corners with strips of drafting

tape Lower parallel edge (or T-square) and fasten

bottom two corners with strips of drafting tape

Drawing Lines

Use parallel edge (or T-square) to draw horizontal lines Lean pencil at about 60°

Use triangles to draw vertical and inclined lines

Drawing Lines at Standard Angles

15°

45°

30°

75°

60°45°

60°

75°

15°

30°

HORIZONTAL 0°HORIZONTAL 0°

90°

VER

TIC

AL

Drawing Parallel Lines

Move parallel edge (or T-square) and triangle to line up with given line AB

With parallel edge (or T-square) held firmly in place, slide triangle into position and draw required line

A

B

REQ’D LINE

Drawing Perpendicular Lines

Move parallel edge (or T-square) and triangle until a side of the triangle lines up with the given line AB

With parallel edge (or T-square) held firmly in place, reposition triangle across line and draw required line

AB

REQ’D LINE

Drawing the Border

TITLE BLOCK AREA

.38

.50

7.63

8.50

.38 10.25 .38

11.00

Recommended layout forA size sheet

Drawing the Title Block

Title block contains information such as drafter, date, and scale Dimensions shown are recommended and may be varied to

accommodate the user’s requirements

INFORMATION RELATEDTO PREPARATION OFDRAWING INCLUDESNAME OF DRAFTER,ENGINEER, CHECKER,ISSUE DATE, ETC.

COMPANY NAMEAND ADDRESS

TITLE

SIZE CAGE CODE DWG NO. REV

SCALE SHEET

1.753.25

4.256.25

.382.383.88

.25.63

1.38

2.00

Centering a Single View Drawing

5.50

1.50

3.00

8.75

1.75 1.75 1.75 1.75

Centering a Single View Drawing

Step 1

4.38 4.38

2.75

2.75

Centering a Single View Drawing

Step 2

1.50

3.00

1.75 1.75 1.75 1.75

Centering a Single View Drawing

Step 3

Centering a Single View Drawing

Step 4

Scale Drawings

Measurements can be full size or in some exact proportion to full size

Triangular scales are typically used to allow for more scales per stick

Scales are noted on drawings as Drawn units = actual units Drawn units : actual units

Reading a Mechanical Scale

160 1 2

FRACTIONAL INCH SCALE (FULL SIZE)

116

14

18

12

1 2 316

Reading a Mechanical Scale

FRACTIONAL INCH SCALE (HALF SIZE)

0 144 42

240

312

3871

41 2

21

Reading a Decimal Scale

DECIMAL INCH SCALE (FULL SIZE)

50(.02) 0

2 4 6 81

2 4 6

1.50.74 1.12

Reading a Decimal Scale

DECIMAL INCH SCALE (HALF SIZE)

HALFSIZE

0 1 2 3 4 5 6 7 8

1.70.50 5.903.20

Reading a Metric Scale

1:1 SCALE (1mm DIVISIONS)

mm1:1

0 10 20 30 40 50 60 70 80

42246 66

Reading a Metric Scale

HALF SCALE (2mm DIVISIONS)

mm1:2

0 20 40 60 80 100 120 140 160

282 62 110

Measuring Angles w/ a Protractor

Angles are measured in units called degrees A circle is divided into 360 parts (360°)

Each part is 1° An angle of 43° is measured with a protractor

43°

Alphabet of Lines

Construction lines Thin and light .020” (0.5mm) Hard lead (4H)

Visible lines Thick and dark .028” (0.7mm) Softer lead (F or HB)

Alphabet of Lines

Hidden lines Thin and dark .020” (0.5mm) Softer lead (F or HB) .125” (3mm) long dashes w/ .030”

(1mm) spaces in between

.0625"

.125"

Alphabet of Lines

Center Lines Thin and dark .020” (3mm) Softer lead (F or HB) .125” (0.5mm) dash in center w/ .030”

(0.1mm) spaces between longer lines

.125"

.0625".75" - 1.5"

Alphabet of Lines

Dimension, Extension, Leader Lines Thin and dark .020” (0.5mm) Softer lead (F or HB)

6.125”

Alphabet of Lines

Thickness

Thick

(.028”/.07mm)

Thin

(.020”/.05mm)

Darkness

Dark

(F or HB)Visible Lines

Hidden Lines

Center Lines

Dimension Lines

Extension Lines

Leader Lines

Light

(F or HB)

Construction Lines

Guidelines

Single View Drawing Assignment