By:Walter C. Brown

andDaniel P. Dorfmueller

By:Walter C. Brown

andDaniel P. Dorfmueller

PowerPoint By:

Daniel P. DorfmuellerPowerPoint By:

Daniel P. Dorfmueller

Copyright 2005 by The Goodheart-Willcox Co., Inc.

Section 2Print ReadingBasics

Section 2Print ReadingBasics

Unit 8Reading Scales and Dimensioning Drawings

Unit 8Reading Scales and Dimensioning Drawings

Scale dimensions from a print. Read dimensions on a print. Add and subtract dimensions. Identify the items that should be

dimensioned on different drawing types.

Scale dimensions from a print. Read dimensions on a print. Add and subtract dimensions. Identify the items that should be

dimensioned on different drawing types.

Learning ObjectivesLearning Objectives

Dimension LinesDimension Lines Dimension and extension lines were

discussed in the Lines and Symbols portion of Unit 4.

Dimension and extension lines were discussed in the Lines and Symbols portion of Unit 4.

Drawing ScaleDrawing Scale Construction projects are drawn to a

reduced scale. Common scale types used

Architect’s Scale1/4" = 1'-0" Every 1/4" on a drawing equals 1 foot of

actual length on the project.1/8" = 1'-0" or 1 ½" = 1'-0"

Engineer’s ScaleA 10 scale means that every 1" on a

drawing equals 10' in reality.Metric Scale

1:50 scale

Construction projects are drawn to a reduced scale.

Common scale types usedArchitect’s Scale

1/4" = 1'-0" Every 1/4" on a drawing equals 1 foot of

actual length on the project.1/8" = 1'-0" or 1 ½" = 1'-0"

Engineer’s ScaleA 10 scale means that every 1" on a

drawing equals 10' in reality.Metric Scale

1:50 scale

Types of ScalesTypes of Scales

Architect’s Scale

Engineer’s Scale

Architect’s Scale1" and 1/8"

Architect’s Scale 1/16" and 1/32"

Architect’s ScaleArchitect’s Scale

ScaleScale

3/32"

3/16"

1/8"

1/4"

3/8"

3/4"

1/2"

1"

1 ½"

3"

3/32"

3/16"

1/8"

1/4"

3/8"

3/4"

1/2"

1"

1 ½"

3"

3"

2"

2"

1"

½"

¼"

¼"

⅛"1/16"1/16"

3"

2"

2"

1"

½"

¼"

¼"

⅛"1/16"1/16"

Tick marksTick marks

Smallest tick markSmallest tick mark

Architect’s ScaleArchitect’s Scale

2"2"

½"½" 1"1"

⅛"⅛"

Identify the smallest tick marks. Identify the smallest tick marks.

Architect’s ScaleArchitect’s Scale

¼"¼" ½"½"

1"1" 2"2"

Identify the smallest tick marks.Identify the smallest tick marks.

Reading an Architect’s ScaleReading an Architect’s Scale

1 inch1 inch

1 inch1 inch

2'2'

4'4'

2 inches2 inches

2'2'2'2'

16'16'16'16' 2 inches2 inches

20'-6"20'-6"20'-6"20'-6"

2' -2' -2' -2' - 4"4"4"4"

Reading an Architect’s ScaleReading an Architect’s Scale

2' - 8½"2' - 8½"

Reading an Architect’s ScaleReading an Architect’s Scale

3'-8"3'-8"3'-8"3'-8"

5 5/8"5 5/8"5 5/8"5 5/8"

Reading an Architect’s ScaleReading an Architect’s Scale

Reading an Engineer’s ScaleReading an Engineer’s Scale

50 feet50 feet 100 feet100 feet

10 feet10 feet

1 inch1 inch1 inch1 inch

Reading a Metric ScaleReading a Metric Scale

2 meters2 meters

10 meters10 meters

How to Scale a LineHow to Scale a Line

12" in scale12" in scale0 mark0 mark

2'-10"2'-10"

Line up on the closest foot marking that still allows the line to trail into the fraction of a foot area.Line up on the closest foot marking that still allows the line to trail into the fraction of a foot area.

The scale is 1½" = 1'.The scale is 1½" = 1'.

How to Scale a LineHow to Scale a Line

12" in scale12" in scale

0 mark0 mark

8'-5½"8'-5½"

Line up on the closest foot marking that still allows the line to trail into the fraction of a foot area.Line up on the closest foot marking that still allows the line to trail into the fraction of a foot area.

The scale is ½" = 1'.The scale is ½" = 1'.

Engineer’s ScaleEngineer’s Scale

Scales:Scales:

1" = 10' (may also be 100', 1000', or even 10,000')

1" = 20'

1" = 30'

1" = 40'

1" = 50'

1" = 60'

1" = 10' (may also be 100', 1000', or even 10,000')

1" = 20'

1" = 30'

1" = 40'

1" = 50'

1" = 60'

How to Scale a LineHow to Scale a Line

Line up on the closest foot mark that still allows the line to trail into the fraction of a foot area.Line up on the closest foot mark that still allows the line to trail into the fraction of a foot area.

The scale is ¾" = 1'.The scale is ¾" = 1'.

Is this correct?Is this correct?

How to Scale a LineHow to Scale a Line

12" in scale12" in scale 0 mark0 mark

6'-11½"6'-11½"

Line up on the closest foot mark that still allows the line to trail into the fraction of a foot area.Line up on the closest foot mark that still allows the line to trail into the fraction of a foot area.

The scale is ¾" = 1'.The scale is ¾" = 1'.

How to Scale a Line with an Engineer’s ScaleHow to Scale a Line with an Engineer’s Scale

164'164'

The scale is 1" = 40'.The scale is 1" = 40'.

Adding and Subtracting DimensionsAdding and Subtracting Dimensions

Find the missing dimension.Find the missing dimension.

5'-6" +5'-6" + 3'-1" =3'-1" = 8'-7"8'-7"

24'-3"24'-3"- 8'-7"- 8'-7"

23'-15"23'-15"- 8'-7"- 8'-7"

15'-8"15'-8"

24'-3"24'-3"

5'-6"5'-6" 3'-1"3'-1"??

Test Your KnowledgeTest Your Knowledge

Take 10 minutes to answer the Test

Your Knowledge questions on page

108 of the text.

Take 10 minutes to answer the Test

Your Knowledge questions on page

108 of the text.

Test Your KnowledgeAnswersTest Your KnowledgeAnswers

1. C. ¼" = 1'-0"2. D. Construction standards using the

metric system have not been established

3. C. 1:504. C. Thickness of wall5. B. 4:126. False7. False8. True

1. C. ¼" = 1'-0"2. D. Construction standards using the

metric system have not been established

3. C. 1:504. C. Thickness of wall5. B. 4:126. False7. False8. True

Test Your KnowledgeAnswersTest Your KnowledgeAnswers

9. False10. True11. A. 1" B. 1" C. ¼" D. ¼"12. 10

9. False10. True11. A. 1" B. 1" C. ¼" D. ¼"12. 10

Activity 8-1

Reading Prints for Dimensions- Frame Residence

Activity 8-1

Reading Prints for Dimensions- Frame Residence

Complete the questions in Activity 8-1 on page 109 using the large prints 8-1a and 8-1b.

Complete the questions in Activity 8-1 on page 109 using the large prints 8-1a and 8-1b.

1. 17'-4"2. 6'-0"3. 69'-4"4. 26'-4"5. 4"

1. 17'-4"2. 6'-0"3. 69'-4"4. 26'-4"5. 4"

6. 8'-0"7. 12"8. 2'-0"9. 4'-6"10. 45'-0"

6. 8'-0"7. 12"8. 2'-0"9. 4'-6"10. 45'-0"

Activity 8-2

Reading Prints for Dimensions– Brick Residence

Activity 8-2

Reading Prints for Dimensions– Brick Residence

Take 10 minutes to complete the questions in Activity 8-2 on page 110 of the text. Use large prints 8-2a and 8-2b.

Take 10 minutes to complete the questions in Activity 8-2 on page 110 of the text. Use large prints 8-2a and 8-2b.

1. 1/8" = 1'-0"2. 72'-0" x 36'-0"3. 30'-3", 11'-2"4. 9"5. 18" x 9"6. 8"7. A. 24'-0"

B. 16'-3"

C. 24'-10"

8. 71'-2" x 35'-2"9. 1'-10"

1. 1/8" = 1'-0"2. 72'-0" x 36'-0"3. 30'-3", 11'-2"4. 9"5. 18" x 9"6. 8"7. A. 24'-0"

B. 16'-3"

C. 24'-10"

8. 71'-2" x 35'-2"9. 1'-10"

10. 14'-6" x 20'-0"11. 27'-6"12. A. 7'-7½"

B. 8'- 1 ½"C. 8'- 1 ½"

13. 1:1214. A. 13

B. 7 7/8"C. 12D. 9"

15. 14'-10"

10. 14'-6" x 20'-0"11. 27'-6"12. A. 7'-7½"

B. 8'- 1 ½"C. 8'- 1 ½"

13. 1:1214. A. 13

B. 7 7/8"C. 12D. 9"

15. 14'-10"

Activity 8-2AnswersActivity 8-2Answers

Activity 8-3Reading and Drawing Using ScalesActivity 8-3Reading and Drawing Using Scales

Take 10 minutes to complete Activity 8-3 on page 112 in the text.

SCALING I, Page 112Using the Architect’s scale, measure the lines using the scale indicated below the line. SCALING II, Page 113Using the Engineer’s scale, measure the lines using the scale indicated below the line.

DIMENSIONING I, Page 114Using an Architect’s scale, draw the length of the dimension, in the scale indicated, on the line provided.DIMENSIONING II, Page 115Using an Engineer’s scale, draw the length of the dimension, in the scale indicated, on the line provided.

Take 10 minutes to complete Activity 8-3 on page 112 in the text.

SCALING I, Page 112Using the Architect’s scale, measure the lines using the scale indicated below the line. SCALING II, Page 113Using the Engineer’s scale, measure the lines using the scale indicated below the line.

DIMENSIONING I, Page 114Using an Architect’s scale, draw the length of the dimension, in the scale indicated, on the line provided.DIMENSIONING II, Page 115Using an Engineer’s scale, draw the length of the dimension, in the scale indicated, on the line provided.

Optional ActivityOptional Activity Fill in all blank dimensions to the nearest inch. Assume all walls are 4" thick.

Fill in all blank dimensions to the nearest inch. Assume all walls are 4" thick.

3’0

” do

or

3’0

” do

or

Scale: 1/4" = 1'-0"Scale: 1/4" = 1'-0"

4’-4” wide window4’-4” wide window

28’-4”28’-4”13’-4”13’-4”

12’-6”12’-6”

24’-6”24’-6”4”4” 4”4”

10’-3”10’-3”2’-6”2’-6”7’-10”7’-10”

25’-6”25’-6”

6’-

3”

6’-

3”

9’-

2”

9’-

2”

12

’-8

”1

2’-

8”

4”4”

10

’-2

”1

0’-

2”

4’-

2”

4’-

2”

2’-

0”

2’-

0”2

’-1

”2

’-1

”

4”4”

ccLL

ccLL

Optional Activity AnswersOptional Activity Answers

3’0

” do

or

3’0

” do

or

Scale: 1/4" = 1'-0"Scale: 1/4" = 1'-0"

4’-4” wide window4’-4” wide window

28’-4”28’-4”13’-4”13’-4”

12’-6”12’-6”

24’-6”24’-6”4”4” 4”4”

10’-3”10’-3”2’-6”2’-6”7’-10”7’-10”

25’-6”25’-6”

6’-

3”

6’-

3”

9’-

2”

9’-

2”

12

’-8

”1

2’-

8”

4”4”

10

’-2

”1

0’-

2”

4’-

2”

4’-

2”

2’-

0”

2’-

0”2

’-1

”2

’-1

”

4”4”

15’-0”15’-0”

12’-10”12’-10” 2’-2”2’-2”

14’-10”14’-10”

2’-10”2’-10”

3’-11”3’-11”

2’-

7”

2’-

7”

1’-

8”

1’-

8”

8,-

2”

8,-

2”

10

’-6

”1

0’-

6”

4’-

0”

4’-

0”

Optional Activity HandoutOptional Activity HandoutFill in all blank dimensions to the nearest inch. All walls are 4" thick.Fill in all blank dimensions to the nearest inch. All walls are 4" thick.

3’0

” do

or

3’0

” do

or

Scale: 1/4"= 1'-0"Scale: 1/4"= 1'-0"

4’-4” wide window4’-4” wide window

28’-4”28’-4”13’-4”13’-4”

12’-6”12’-6”

24’-6”24’-6”4”4” 4”4”

10’-3”10’-3”2’-6”2’-6”7’-10”7’-10”

25’-6”25’-6”

6’-

3”

6’-

3”

9’-

2”

9’-

2”

12

’-8

”1

2’-

8”

4”4”

10

’-2

”1

0’-

2”

4’-

2”

4’-

2”

2’-

0”

2’-

0”2

’-1

”2

’-1

”

4”4”

ccLL

ccLL

END OF UNIT 8END OF UNIT 8

It’s all about the scale of things!It’s all about the scale of things!