career & technical education basic drafting skills 003.03 demonstrate correct drawing procedures
TRANSCRIPT
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°
VERTIC
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 LinesCenter Lines
Dimension LinesExtension Lines
Leader Lines
Light(F or HB)
Construction LinesGuidelines
Single View Drawing Assignment