AutoCAD 2008 Essential Training
Illustration by Don Barnett

AutoCAD 2008 Essential Training

with Jeff Bartels

Video: Object snaps

One thing is certain. We will never create a drawing by simply free-picking points on screen. If we want to draft accurately, we will need to know how to use AutoCAD's coordinate system to lock on to our geometry. I am going to open a drawing and I am going to our Open icon and we are going to come down to our Exercise Files folder, we will go into Chapter 5 and I am going to open up the number 2 drawing, Using OSNAPS. So I will highlight that guy and click Open to bring him up on screen. When I look at this drawing, I can see a finished version on the right and an almost finished version on the left. Our job throughout this session is to go through and finish each of the drawings.
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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

Object snaps

One thing is certain. We will never create a drawing by simply free-picking points on screen. If we want to draft accurately, we will need to know how to use AutoCAD's coordinate system to lock on to our geometry. I am going to open a drawing and I am going to our Open icon and we are going to come down to our Exercise Files folder, we will go into Chapter 5 and I am going to open up the number 2 drawing, Using OSNAPS. So I will highlight that guy and click Open to bring him up on screen. When I look at this drawing, I can see a finished version on the right and an almost finished version on the left. Our job throughout this session is to go through and finish each of the drawings.

Let's look at this guy first. If I want to finish this star shape, I am going to launch my Line command and it would be really nice if I knew what the coordinate of the end of that line was. Now I could look down in the lower left hand corner of my screen. I could check out the status bar, but I would only be guessing because as I move around those numbers change. So I need to know what the coordinate is, but you know what AutoCAD is a tool that will find that coordinate for me, that tool is called an Object Snap. So I am going to hit my Escape key to cancel out of the Line command and let's bring up the Object Snap toolbar on our screen.

I am going to come over and right-click on an existing tool and in the list of toolbars, I am going to come down to Object Snap. Let me click on this guy to turn him on. He pops up right in the middle of our screen. He is going to be important for this session, so I am going to keep him right in the middle. I am going to click, hold and drag and I will move him right up to here. I can use Object Snaps to lock on to my geometry. Let's start by looking at the endpoint Object Snap. I am going to launch my Line command. Now I would like to start my line from the endpoint of this line.

If I want to do that, AutoCAD is asking me to specify first point. I am going to come up, click my endpoint Object Snap and now if we look the command line, AutoCAD is looking for an endpoint. So as I move my cursor close to this line, notice AutoCAD brings up a little icon, tells me it's going to find the endpoint. If I left-click, AutoCAD just locked on to that location. Now I can go to my next point. I am going to come up and select endpoint again. I want to lock on to the endpoint right here. Now that I am done, I am going to hit my Escape key.

Let's take and finish this guy up, I am going to right-click to go right back into the Line command. AutoCAD says, where is your first point? Well I am going to come up and we are going to use an Object Snap. I am going to say the endpoint and I am going to hover by this line. Notice how far away from that endpoint I can be and still grab that endpoint. S long as I am 50% of the way to one side I can grab the endpoint. Notice as I get closed to the other side, AutoCAD is going to find the other endpoint. The thing I am trying to stress is you don't have to be right on it to grab it, OK.

So I can grab the endpoint from right here, let me just left-click, AutoCAD found it where do I want to go to, I am going to come up and click my endpoint Object Snap again and I grab the endpoint right here. Let me hit Escape. That is the endpoint Object Snap. It allows us to lock onto the endpoints of our geometry. Let's look at another one. I am going to pan this geometry up. Let's look at this center-point Object Snap, now the center point obviously allows us to snap to the center of our circles or our arcs.

Let's replicate the geometry we see on the right. Once again I am going to launch my Line command. I will click Line and then I am going to come over and I am going to click to this icon, represents my center Object Snap. Once again if we look at the command line, AutoCAD is saying center of. If I want to grab a center Object Snap, we need to look at the x or the cursor on my screen as AutoCAD's eyeball. As I move the cursor on top of my geometry, notice as soon as the eyeball hits the arc, AutoCAD finds the center. At this point, when the eyeball hits the arc, I can left- click and AutoCAD will find the center of that entity.

Let me come up and grab another center Object Snap and then we will put our eyeball on this arc and click. Once again, we don't have to move our cursor all the way to the actual location of the Object Snap. Let me hit Escape. Let's finish this guy up. I am going to launch the Line command. Where do I want to start? I want to start from the center of here and I want to go to the center of here and I want to go to the center of here. Alright let me hit Escape to finish.

That is the center-point Object Snap. Let's pan this up. We have another Object Snap for midpoint. I am going to use the midpoint Object Snap to replicate the geometry we see on the right. I am going to launch my Line command. This time we are going to come up and we are going to click this icon, this icon represents midpoint. Don't forget the little tool-tip that pop-ups. Sometimes it may take a little while before you remember what each one of these little cryptic symbols means. midpoint is right here, let me click that. AutoCAD says midpoint of what? As I bring my cursor down and put the eyeball on the entity, notice AutoCAD brings up a little symbol that represents midpoint. Each of the Object Snaps has a different symbol, midpoint happens to be a triangle.

So I will bring my cursor down and touch the line, left-click to grab the midpoint and where do I want to go? I want to go to the midpoint right here. Let me hit Escape and we will finish this guy up. I will go right back into the Line command and I want to go from the midpoint of the left side to the midpoint of the right. Let me hit Escape to get out of the command. That is the midpoint Object Snap. Let's pan up. We have got one for intersection. Intersection will allow us to snap to the intersection of existing line work, let's replicate this geometry. I am going to do it with circles.

So I am going to launch my Circle command. Where would I like the center-point of my circle to be? I am going to come up to my intersection Object Snap and click. I want to place my circle to the intersection right here. Now with the intersection Object Snap, you do have to be pretty close to the intersection because AutoCAD needs to see both lines. So let me left-click. AutoCAD found the intersection. Now I don't need to know what the radius is. You know you may be thinking well how is he going to know what radius to put in there? I am just going to use another intersection. If I click intersection, I can grab the intersection of this circle in the line.

Remember we don't have to enter a radius or a diameter for a circle, we can pick a point on screen as well. Alright let's finish it up. I am going to go right back to the Circle commands, let me right-click, Repeat Circle. And this time we are going to have to mix the Object Snaps up just a little bit. I am going to use endpoint first, endpoint of here to the intersection right there. Last one. Right-click, Repeat Circle and I want to go from the endpoint here to the intersection right there.

Using Object Snaps is the only way to create accurate geometry, because if I am using an Object Snap, I know that I am locking onto my coordinate with an accuracy of 14 spaces to the right of the decimal. Let me pan this up. I have got a couple more I'd like to look at. We are going to look at the quadrant Object Snap. Quadrant allows us to snap to the north, south, east or west areas of a circle or an arc. If I left-click on this circle, notice I get little blue squares. Those pop up at the quadrant locations. Let me hit Escape to deselect the circle and let's finish our basketball.

I am going to do this with the line command, so we will come up and launch Line. I want to draw a line from the quadrant. That quadrant icon is right here, Snap to Quadrant. If I put AutoCAD's eye on the arc, notice I can find the quadrant at the top. If I move close to the edge, I could find the quadrant over here, whichever one I happen to be closest to is one AutoCAD is going to grab. Let me click to grab this Object Snap. We will go to the quadrant down here. I will hit Escape to get out of the command and we will finish this guy. I am going to right-click, go right back into the Line command. I want to draw that line from the quadrant of the left side to the quadrant of the right. Let me hit Escape to finish.

Let me pan this guy up. We have got two more Object Snaps I want to look at. This one is tangent, it's important to know how to use the tangent Object Snap. Tangent will allow us to create geometry that is tangent to an arc. I am going to replicate this geometry using the Line command, so I am going to launch Line. Where do I want to start my line? I am going to come up and grab the tangent Object Snap. As I put AutoCAD's eye on the arc, notice the symbol is different for tangent. If I click and as I pull away, notice the line segment that I'm creating was always going to maintain its tangency to that arc.

So I am starting from that point. Where do I want to go to? I want to go to a point tangent to this arc. And when I click I get my line. Let me hit Escape to cancel out and we'll finish this guy up. I am going to right-click, Repeat Line. I want to start from a point tangent to this arc and I want to go to a point, we'll click tangent to this arc. Let me go and hit Escape. Pan this up. We will do the last one, perpendicular. Perpendicular will allow us to create geometry that is perpendicular to other geometry.

I am going to finish this guy using the Line command. So I am going to come over and launch Line, specify first point. This time we are going to mix the Object Snaps up just a little bit. I want to start from the endpoint here. I also could have chosen intersection if I wished and I want to go to a point perpendicular. Here's my perpendicular Object Snap. I will click this guy and when I put AutoCAD's eye on that line, notice no matter where I click on this line, AutoCAD is going to find the perpendicular location. So let me left-click to find that, I will hit Escape.

We will do one more and I want to create a line from the intersection here and I want to draw that perpendicular to this line. Let me left-click to grab that snap and I will hit Escape to get out of the command. Now Object Snaps are very valuable. We are going to be using these frequently from this point on, so I am going to dock this toolbar to my interface. And I am going to dock this to the right side. You maybe wondering, why don't you dock it to the left where all the other toolbars are? I do that for a reason because some times the Object Snap icons tend to look similar to some of the Draw icons.

We can see that the Line icon happens to look very similar to endpoint and the Circle icon happens to look very similar to center-point. So if I take and dock this toolbar to the right side, we can always remember that the Object Snaps are to the right and the Draw tools are to the left. From this moment on, we will always use Object Snaps as we draft. Using Object Snaps is the only way to guarantee that we are creating accurate geometry.

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