1. 003.03 Demonstrate correct drawing procedures
Basic Drafting Skills
003.03
Demonstrate correct drawing procedures

2. 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

3. 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

4. Drawing Lines at Standard Angles
90° VERTICAL
75°
75°
60°
60°
45°
45°
30°
30°
15°
15°
HORIZONTAL 0°

5. 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

6. 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 A B
REQ’D LINE

7. Drawing the Border Recommended layout for A size sheet 11.00 10.25 .50
TITLE BLOCK AREA
.38
.50
7.63
8.50
10.25
11.00
Recommended layout for
A size sheet

8. 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 RELATED
TO PREPARATION OF
DRAWING INCLUDES
NAME OF DRAFTER,
ENGINEER, CHECKER,
ISSUE DATE, ETC.
COMPANY NAME
AND ADDRESS
TITLE
SIZE
CAGE CODE
DWG NO.
REV
SCALE
SHEET
1.75
3.25
4.25
6.25
.38
2.38
3.88
.25
.63
1.38
2.00

9. Centering a Single View Drawing
5.50
1.50
3.00
8.75
1.75

10. Centering a Single View Drawing
Step 1
4.38
2.75

11. Centering a Single View Drawing
Step 2
1.50
3.00
1.75

12. Centering a Single View Drawing
Step 3

13. Centering a Single View Drawing
Step 4

14. 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

15. Reading a Mechanical Scale1 16 1 8 1 4 2 3 16 1 2 1 16 1 2
FRACTIONAL INCH SCALE (FULL SIZE)

16. Reading a Mechanical Scale3 8 7 2 1 1 4 1 44 42 2 40 3
FRACTIONAL INCH SCALE (HALF SIZE)

17. Reading a Decimal Scale
1.50
1.12
.74 50
(.02) 2 4 6 8 1
DECIMAL INCH SCALE (FULL SIZE)

18. Reading a Decimal Scale
.50
1.70
3.20
5.90
HALF
SIZE 1 2 3 4 5 6 7 8
DECIMAL INCH SCALE (HALF SIZE)

19. Reading a Metric Scale 1:1 SCALE (1mm DIVISIONS) 6 66 24 42 mm 10 2010 20 30 40 50 60 70 80
1:1 SCALE (1mm DIVISIONS)

20. HALF SCALE (2mm DIVISIONS)
Reading a Metric Scale 2
110 62 28 mm
1:2 20 40 60 80
100
120
140
160
HALF SCALE (2mm DIVISIONS)

21. 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°

22. Alphabet of Lines Construction lines Visible lines Thin and light
.020” (0.5mm)
Hard lead (4H)
Visible lines
Thick and dark
.028” (0.7mm)
Softer lead (F or HB)

23. 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
.125"
.0625"

24. 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"
.75" - 1.5"
.0625"

25. Alphabet of Lines Dimension, Extension, Leader Lines Thin and dark
.020” (0.5mm)
Softer lead (F or HB)
6.125”

26. 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
Construction Lines
Guidelines