AutoCAD 2008 Essential Training
Illustration by Don Barnett

AutoCAD 2008 Essential Training

with Jeff Bartels

Video: Cartesian coordinates

In this session, we are going to take a closer look at Model space, otherwise known as our drafting board. Our approach is going to be a little bit different because we are going to look at a Model space from the computer's point of view. Taking this behind the scenes look can be very helpful in teaching us how AutoCAD maintains our line work. Model space is essentially an infinitely large sheet of graph paper. We use this graph paper to construct our geometry and AutoCAD uses this graph paper to maintain our accuracy. AutoCAD maintains our accuracy through the use of baselines.
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  1. 3m 27s
    1. Welcome
      1m 6s
    2. Introduction to AutoCAD
      1m 29s
    3. Using the exercise files
      52s
  2. 23m 16s
    1. Modelspace
      2m 21s
    2. Toolbars
      3m 24s
    3. Pulldowns
      3m 36s
    4. AutoCAD's command line
      1m 46s
    5. Dockable palettes
      3m 23s
    6. The Status bar
      2m 59s
    7. Saving your workspace
      2m 12s
    8. Essential settings
      3m 35s
  3. 19m 8s
    1. Opening an AutoCAD drawing
      3m 1s
    2. Mouse functions
      2m 2s
    3. Zooming, panning, and regen
      5m 11s
    4. The multiple-document environment
      3m 24s
    5. Saving your work
      2m 34s
    6. Using templates
      2m 56s
  4. 16m 37s
    1. The Line command
      3m 17s
    2. ORTHO and POLAR modes
      5m 45s
    3. The Circle command
      3m 27s
    4. The Heads-Up display
      4m 8s
  5. 15m 51s
    1. Defining units of measure
      6m 13s
    2. Drafting with architectural units
      5m 1s
    3. Drafting with metric units
      4m 37s
  6. 20m 52s
    1. Cartesian coordinates
      5m 50s
    2. Object snaps
      10m 27s
    3. Automating object snaps
      4m 35s
  7. 23m 33s
    1. Rectangle
      4m 22s
    2. Ellipse
      6m 0s
    3. Hatch
      8m 34s
    4. Polygon
      4m 37s
  8. 23m 28s
    1. Move and Copy
      6m 45s
    2. Rotate
      5m 6s
    3. Offset
      6m 1s
    4. Erase
      2m 6s
    5. Undo and Redo
      3m 30s
  9. 12m 38s
    1. Windows and crossing windows
      4m 49s
    2. Removing from selections
      3m 44s
    3. Using key-ins
      4m 5s
  10. 1h 4m
    1. Trim and Extend
      6m 55s
    2. Fillet
      5m 3s
    3. Chamfer
      6m 36s
    4. Array
      8m 2s
    5. Mirror
      6m 54s
    6. Stretch
      5m 51s
    7. Scale
      5m 19s
    8. Grips
      7m 37s
    9. Explode
      4m 17s
    10. Polyline edit
      7m 48s
  11. 26m 8s
    1. Layers
      3m 32s
    2. The Layer Properties Manager
      9m 8s
    3. Layer control
      4m 30s
    4. The ByLayer property
      5m 27s
    5. The Layer Previous command
      3m 31s
  12. 43m 16s
    1. Single-line text
      3m 47s
    2. Text justification
      7m 3s
    3. Text styles
      7m 31s
    4. Multi-line text
      6m 30s
    5. Editing
      3m 24s
    6. Bulleted and numbered lists
      4m 7s
    7. Symbols
      6m 19s
    8. Spell-checking
      4m 35s
  13. 29m 0s
    1. Creating dimensions
      8m 36s
    2. Dimension styles
      6m 39s
    3. Callouts
      6m 42s
    4. Tweaking dimensions
      7m 3s
  14. 14m 53s
    1. The Distance command
      4m 17s
    2. The Property Changer
      6m 31s
    3. The Quick Calculator
      4m 5s
  15. 25m 10s
    1. Creating and inserting blocks
      10m 16s
    2. Using blocks
      5m 47s
    3. Modifying blocks
      4m 8s
    4. Building your library
      4m 59s
  16. 48m 45s
    1. Quick plots
      6m 42s
    2. Selecting a pen table
      5m 37s
    3. Layouts pt. 1: Choosing paper
      3m 23s
    4. Layouts pt. 2: Inserting a title block
      3m 13s
    5. Layouts pt. 3: Cutting a viewport
      6m 18s
    6. Layouts pt. 4: Reusing layouts
      4m 16s
    7. Scale factors
      4m 0s
    8. Sizing modelspace text
      7m 17s
    9. Sizing modelspace dimensions
      4m 48s
    10. Sizing linetypes
      3m 11s
  17. 10m 1s
    1. Drawing compatibility
      3m 5s
    2. E-transmitting
      3m 12s
    3. Saving to the Design Web format
      3m 44s
  18. 20s
    1. Goodbye
      20s

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Watch the Online Video Course AutoCAD 2008 Essential Training
6h 58m Beginner May 13, 2008

Viewers: in countries Watching now:

AutoCAD is a computer-aided drafting and design program that is the industry standard for a wide variety of 2D and 3D work. AutoCAD 2008 features several improvements over previous versions, but the core functionality and workflows have remained consistent for years. Users who have any of the more recent editions of the software will find AutoCAD 2008 Essential Training to be a valuable resource. Instructor Jeff Bartels has taught and used AutoCAD for a decade, and in this course he focuses on the difficult to master concepts that matter most to professional AutoCAD users. Exercise files accompany the course.

Topics include:
  • Opening, viewing, saving, and sharing drawings
  • Customizing the workspace
  • Mastering drawing fundamentals and specialized commands
  • Defining units of measure and controlling accuracy
  • Making primary modifications and major changes to a drawing
  • Organizing layers and reusable content
  • Annotating and dimensioning
  • Plotting with layouts
  • Sizing linetypes, modelspace text, and dimensions for a plot
Subject:
CAD
Software:
AutoCAD
Author:
Jeff Bartels

Cartesian coordinates

In this session, we are going to take a closer look at Model space, otherwise known as our drafting board. Our approach is going to be a little bit different because we are going to look at a Model space from the computer's point of view. Taking this behind the scenes look can be very helpful in teaching us how AutoCAD maintains our line work. Model space is essentially an infinitely large sheet of graph paper. We use this graph paper to construct our geometry and AutoCAD uses this graph paper to maintain our accuracy. AutoCAD maintains our accuracy through the use of baselines.

The first baseline I want to talk about is a major east/west baseline, otherwise known as the X-axis. Now, the X-axis is also a number line and any value to the right of zero is considered positive x, any value to the left of zero is considered negative x. Now, there is another baseline AutoCAD uses. This is a major north/south baseline, it is called the Y-axis. The Y-axis is also a number line. Any value above the X-axis is considered a positive y, anything below the X-axis is considered negative y. This system of using an x and y axis to organize our locations and space is called the Cartesian Coordinates system.

Now, this graph paper that we see on screen is completely invisible when we draft. We won't see this as we draw, but it is there. It is going on in the background and AutoCAD uses this system to organize our geometry. AutoCAD uses the Cartesian Coordinates system to identify all locations and space. Now, AutoCAD uses a fancy name for locations and space, AutoCAD uses the word coordinates. AutoCAD references coordinates using the format x, y. Now, take a look at the area where the x and y axis intersect.

That intersection has a coordinate value of 0,0 because each of the axes is intersecting at the zero location. Now, the intersection of the x and y axis also has a name, it's called the origin. All AutoCAD coordinates are measured from the origin. For instance, I am going to bring some points up on screen. We will see how this works. If I wish to bring up a location right here, this guy has a coordinate value of 4,2. That's because he is 4 units in the positive x direction and he is 2 units in the y direction.

It's kind of like playing Battleship. Let me bring up another point. Let's look at this guy. This guy has a coordinate value of 3,9, because he is 3 over in the x and he is 9 up in the y. Let's pop up another one. What about this coordinate? This guy has a value of -6,4, he is -6 in the x direction and he is 4 in the y direction. Last one, we bring up one down here. This guy has a coordinate value of -5,-7. He is -5 in the x and he is -7 in the y.

Let's look at the Cartesian Coordinates system from my perspective. Let's assume I am creating a line in AutoCAD. If I am creating a line, I start out by picking my start point and then I pick my end point to complete my life. Let's look at how AutoCAD views this line. AutoCAD views this as a line segment that was drawn from coordinate -8,-3 to coordinate 8,10. Now, I am going to return to my AutoCAD environment. Now that we understand how coordinates work, I want you to take a look at the lower left-hand corner of our screen in our status bar.

Remember, this is the area that represents the current coordinate location of our cursor. Hopefully, this makes more sense now as I move my cursor, we can see the exact location on my invisible graph paper where my cursor is located. One more thing, take a look at this guy in the lower left-hand corner. This is our UCS icon. This icon right now is telling us the current direction of our positive X-axis and our positive Y-axis. I would I like to create a couple pieces of geometry using coordinates. Before I start, I am going to come down and I am going to turn off my Heads Up display, I am going to turn off my Dynamic Input.

This guy tends to take some liberties when we are entering coordinate values. And if I turn him off temporarily, we won't have any problems. Let's create a circle and this time, I am going to place it using coordinates. I am going to come over and launch my Circle command by clicking on it and AutoCAD says specify center point for my circle. I am going to type in 25,25. I am typing in an actual coordinate where I want the center of that circle to be located. Let me hit Enter. I am creating that circle at coordinate 25,25. As far as my radius, I am going to type in 10.

We will just create a circle with a radius of 10. Let's make one more circle. I am going to right-click, select Repeat Circle. Specify center point. I am going to use the coordinate 75,25. Now hit Enter. Based on my coordinate values, the circle happens to be 50 units to the right of the first circle. And I am going to hit Enter and accept the default because I want to create the same size circle. Each of these circles was drawn using a coordinate. I want to do one more thing. Let's take and draw a line from the center of one circle to the center of the other.

I am going to launch the Line command. I would like to draw a line from the center of this circle and I happen to know what that coordinate is. So I am going to type in 25,25 from my coordinate. I will hit Enter, that's where I am starting from. I would like to draw this line to the center of this circle and we happen to know what its coordinate is. Let me type in 75,25 and hit Enter. I am all done with the command. So I am going to right-click and select Enter to exit. Most of the time, we will not be entering coordinates as we draft.

However, it is important for you to understand the fundamental way AutoCAD processes our line work in the background. Think of it this way. AutoCAD is a vector application whose job is simply creating and maintaining geometry. Everything we draft is mapped out on an underlined x/y coordinate system and AutoCAD uses this system to maintain the accuracy of our drawings.

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