The Imperial System:

**The Metric System SI:**- It is based on a decimal system (ie. powers of ten). Therefore, it simplifies calculations by using a set of prefixes
- "milli" means 10^-3 or 0.001
- "centi" means 10^-2
- "deci" means 10^-1
- "deca" means 10^1
- "hecto" means 10^2
- "kilo" means 10^3 or 1000

- It is used by most other nations of the world, and therefore, it has commercial and trade advantage

The Imperial System:

- Used in majority by the US
- Much more complicated than the Metric System
- The units come from body parts
- Twelve inches = one foot
- Three feet = one yard
- Five and a half yards = one rod, pole or perch
- Four poles = one chain
- ten chains = one furlong
- Eight furlongs = one mile or 5280 feet

- Inches are divided using many "bases" 1/2 1/4 1/8 1/16 1/32

Date formats also vary from country to country.

What is the date represented by 08/11//19?

Using the US standard date format, it would be August 11th, where in Canada, it might be November 8th

You need to know your formats!

When you RECORD MEASUREMENTS - you MUST conform to a standard FORMAT

When you put your measurements into Sketchup, you must use this format in order to produce accurately scaled models

IMPERIAL measurements are formatted into FEET followed by INCHES ie 8' 2"

EXAMPLES

What is the date represented by 08/11//19?

Using the US standard date format, it would be August 11th, where in Canada, it might be November 8th

You need to know your formats!

**RECORDING MEASUREMENTS**When you RECORD MEASUREMENTS - you MUST conform to a standard FORMAT

When you put your measurements into Sketchup, you must use this format in order to produce accurately scaled models

IMPERIAL measurements are formatted into FEET followed by INCHES ie 8' 2"

- There is a single space between the two units
- Feet are denoted by an apostrophe '
- Inches are denoted by a quotation "
- When expressing a measurement in feet and inches, Inches should never be expressed >= 12
- Fractions of an inch can be expressed as a decimal, or as a numerator/denominator

EXAMPLES

- GOOD FORMAT:
- 83' 9 1/2" or
- 83' 9.5"

- BAD FORMAT
- 80' 49.5"
- 82.21'
- 82' 211/2"

- GOOD FORMAT:

PRACTICE makes perfect!Open the following link, and use the game to familiarize yourself with imperial measurement

- Leave the game set to use SIXTEENTHS
- Look near the top for the measurement you're supposed to identify
- You get up to THREE strikes
- DON'T GIVE UP until you have achieved a score of 300 or better!
- Click START NEW GAME when you're ready

Measurement ExerciseFollow the instructions provided by your teacher and complete this exercise

MEASURING EDGES & ANGLESA piece of woodworking stock has , EDGES and CORNERS

- A FACE is a flat surface, like the front or top of a box.
- An EDGE is a line along which two faces come together.
- A CORNER is a "point" on a shape, a vertex where several faces (and edges) come together.

*ALL STOCK must be "DRESSED" to ensure that the edges and faces are "SQUARE"*

What is "SQUARE"?In most projects, it's important that your stock is properly DRESSED so that all faces are SQUARE to each other

- Opposite Faces are parallel to each other
- Adjoining Faces are at 90* to each other
- These are also referred to as "RIGHT angles"

Framing Square

Combination Square

A "Square" is also a carpenter's tool with two edges meeting at 90* from each other used to trace or "scribe" perfect right angles. The first photo is a Framing Square and the next is a combination square.