By: Walter C. Brown and Daniel P. Dorfmueller PowerPoint By: Daniel P. Dorfmueller Copyright 2005 by The Goodheart-Willcox Co., Inc.

Section 2 Print Reading Basics

Unit 8 Reading Scales and Dimensioning Drawings Learning Objectives 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 Objective are listed on page 99 of the text.

Dimension Lines Dimension and extension lines were discussed in the Lines and Symbols portion of Unit 4. Discussed on page 99 of the text.

Drawing Scale Construction projects are drawn to a reduced scale. Common scale types used Architect’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 Scale A 10 scale means that every 1" on a drawing equals 10' in reality. Metric Scale 1:50 scale Introduced on page 100 of the text.

Architect’s Scale 1/16" and 1/32" Types of Scales Architect’s Scale Engineer’s Scale Architect’s Scale 1" and 1/8" Image may be found on page 100 of the text. Architect’s Scale 1/16" and 1/32"

Architect’s Scale Tick marks Smallest tick mark Scale 3/32" 3" 3/16" 1/8" 1/4" 3/8" 3/4" 1/2" 1" 1 ½" 3" 3" 2" 1" ½" ¼" ⅛" 1/16" Tick marks Presented on page 100 of the text.

Identify the smallest tick marks. Architect’s Scale Identify the smallest tick marks. 2" 1" ½" ⅛"

Architect’s Scale Identify the smallest tick marks. ½" ¼" 1" 2"

Reading an Architect’s Scale 2' 1 inch 4' 1 inch 2' 2 inches 2 inches 16'

Reading an Architect’s Scale 2' - 4" 20'-6"

Reading an Architect’s Scale 2' - 8½"

Reading an Architect’s Scale 3'-8" 5 5/8"

Reading an Engineer’s Scale 50 feet 100 feet 1 inch 1 inch 10 feet

Reading a Metric Scale 2 meters 10 meters

How to Scale a Line The scale is 1½" = 1'. Line up on the closest foot marking that still allows the line to trail into the fraction of a foot area. 2'-10" 12" in scale 0 mark

How to Scale a Line The scale is ½" = 1'. Line up on the closest foot marking that still allows the line to trail into the fraction of a foot area. 8'-5½" 12" in scale 0 mark

Engineer’s Scale Scales: 1" = 10' (may also be 100', 1000', or even 10,000') 1" = 20' 1" = 30' 1" = 40' 1" = 50' 1" = 60' Presented on page 101 of the text.

How to Scale a Line The scale is ¾" = 1'. Line up on the closest foot mark that still allows the line to trail into the fraction of a foot area. Is this correct?

How to Scale a Line The scale is ¾" = 1'. Line up on the closest foot mark that still allows the line to trail into the fraction of a foot area. 6'-11½" 12" in scale 0 mark

How to Scale a Line with an Engineer’s Scale The scale is 1" = 40'. 164'

Adding and Subtracting Dimensions Find the missing dimension. 24'-3" 5'-6" 3'-1" ? 5'-6" + 3'-1" = 8'-7" Introduced on page 106 of the text. 24'-3" - 8'-7" 23'-15" - 8'-7" 15'-8"

Test Your Knowledge Take 10 minutes to answer the Test Your Knowledge questions on page 108 of the text.

Test Your Knowledge Answers C. ¼" = 1'-0" D. Construction standards using the metric system have not been established C. 1:50 C. Thickness of wall B. 4:12 False True

Test Your Knowledge Answers False True A. 1" B. 1" C. ¼" D. ¼" 10

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. 17'-4" 6'-0" 69'-4" 26'-4" 4" 8'-0" 12" 2'-0" 4'-6" 45'-0"

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.

Activity 8-2 Answers 1/8" = 1'-0" 72'-0" x 36'-0" 30'-3", 11'-2" 9" B. 16'-3" C. 24'-10" 71'-2" x 35'-2" 1'-10" 14'-6" x 20'-0" 27'-6" A. 7'-7½" B. 8'- 1 ½" C. 8'- 1 ½" 1:12 A. 13 B. 7 7/8" C. 12 D. 9" 14'-10"

Activity 8-3 Reading and Drawing Using Scales Take 10 minutes to complete Activity 8-3 on page 112 in the text. SCALING I, Page 112 Using the Architect’s scale, measure the lines using the scale indicated below the line. SCALING II, Page 113 Using the Engineer’s scale, measure the lines using the scale indicated below the line. DIMENSIONING I, Page 114 Using an Architect’s scale, draw the length of the dimension, in the scale indicated, on the line provided. DIMENSIONING II, Page 115 Using an Engineer’s scale, draw the length of the dimension, in the scale indicated, on the line provided.

Optional Activity Fill in all blank dimensions to the nearest inch. Assume all walls are 4" thick. 3’0” door Scale: 1/4" = 1'-0" 4’-4” wide window 28’-4” 13’-4” 12’-6” 24’-6” 4” 10’-3” 2’-6” 7’-10” 25’-6” 6’-3” 9’-2” 12’-8” 10’-2” 4’-2” 2’-0” 2’-1” c L

Optional Activity Answers 3’0” door Scale: 1/4" = 1'-0" 4’-4” wide window 28’-4” 13’-4” 12’-6” 24’-6” 4” 10’-3” 2’-6” 7’-10” 25’-6” 6’-3” 9’-2” 12’-8” 10’-2” 4’-2” 2’-0” 2’-1” 15’-0” 12’-10” 2’-2” 14’-10” 2’-10” 3’-11” 2’-7” 1’-8” 8,-2” 10’-6” 4’-0”

Optional Activity Handout Fill in all blank dimensions to the nearest inch. All walls are 4" thick. 3’0” door Scale: 1/4"= 1'-0" 4’-4” wide window 28’-4” 13’-4” 12’-6” 24’-6” 4” 10’-3” 2’-6” 7’-10” 25’-6” 6’-3” 9’-2” 12’-8” 10’-2” 4’-2” 2’-0” 2’-1” c L

END OF UNIT 8 It’s all about the scale of things!