Welding Blueprints and Symbols

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2. Scale

• Is a tool which enables _______engineers________, architects and contractors to obtain measurements of buildings and structures from scaled drawings and maps

3. Scale

• Characteristics include:

- ______common_________ lengths – 4, 6, 12, 18, 24 and 36 inches

- most commonly used size is approximately

12 3/4 inches in length with only 12 inches of markings

- usually _______three________-sided or beveled

4. Scale

• Characteristics include:

- typically made of _____plastic__________, wood or metal

- available as an architect’s scale or engineer’s scale

- uses the imperial system (inch) or ______metric_________ (millimeter) for measurements

5. Architectural Scale Tools

- Are used by _____architects__________ on large and small projects

- Are always reads as X = 1 foot, 0 inches

– example: 1/2 inch = 1 foot, 0 inches

- Are read from the left or right, depending on _______scale________ used

6. Architectural Scale Tools

• Are three-sided and have ______11_________ scales with graduations of 16, 3, 1 1/2, 1, 3/4, 1/2, 3/8, 1/4, 3/16, 1/8 and 3/32 to the

____foot___________

– the 16, or full scale, is a standard 12 inch ruler scale

7. Architectural Scale Sizes

• Include:

- 12 inches = 1 foot, 0 inches or ____full___________ size

- 3 inches = 1 foot, 0 inches or 1/4 size

- 1 1/2 inches = 1 foot, 0 inches or 1/8 size

- 1 _____inch__________ = 1 foot, 0 inches or 1/12 size

- 3/4 inch = 1 foot, 0 inches or 1/16 size

- 1/2 inch = 1 foot, 0 inches or 1/24 size

8. Architectural Scale Sizes

• Include:

- 3/8 inch = 1 foot, 0 inches or 1/32 size

- 1/4 inch = 1 _____foot__________, 0 inches or 1/48 size

- 3/16 inch = 1 foot, 0 inches or 1/64 size

- 1/8 inch = 1 foot, 0 inches or 1/96 size

- 3/32 _____inches__________ = 1 foot, 0 inches or 1/128 size

9. Architectural Scale Tools

• Are beveled with ________eight_______ scales having graduations of 1/8, 1/4, 1/2, 1, 3/8, 3/4, 1 1/2 and 3 inches per foot

– the scale “below” 0 represents _______fractions________ of one foot for the scale used

10. Engineering Scale Tools

- Are used by engineers on _______drawings________ of buildings, roads, bridges, topographical maps and high precision drawings

- Include:

– ______three_________-sided scale, labeled 10, 20, 30, 40, 50 and 60 – beveled with four scales in graduations of 10, 30, 40 and 50

11. Engineering Scale Tools

- Contain units of measurement which are _______equal________ to parts per inch

- Are read from left to right

– whole numbers represent _______feet________ multiplied by 10 and the small marks between represent individual feet

- example: six marks to the right of the whole number five would represent 56 feet

12. Engineering Scale Sizes

• Include:

- 10 - _______full________ size or 1 inch = 10 feet

- 20 - half size or 1 inch = 20 feet

- 30 - 1 inch = 30 feet

- 40 - _______quarter________ size or 1 inch = 40 feet

- 50 - 1 inch = 50 feet

- 60 - 1 inch = 60 feet

13. Steps to Using a Scale Tool

- _______match________ the scale to the scale on the drawing

− example: 1 inch = 1 foot, 0 inches, use the 1 scale or 1/12 size

− example: 1:20 or 1 inch = 20 feet, use the 20 scale or 1/2 size

- Select an object to measure and select the appropriate tool for the

_____scale__________ provided

14. Steps to Using an Architectural Scale

- Locate the ________appropriate_______ scale

- Align the ________zero_______ with one side of object being measured

- Read the foot measurement at the opposite end of object being measured

15. Steps to Using an Architectural Scale

- Note the whole foot mark closest to zero

- If the foot mark does not align, slide the scale ____left or right___________ to align the noted whole foot mark with the end of the measurement

- Align the smaller ____fractional___________ marks with the beginning of the measurement

16. Steps to Using an Architectural Scale

- Read the marks in ________fractions_______ of inches

- Add this number to the

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