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Locking to geometry using object snaps

From: AutoCAD 2011 Essential Training

Video: Locking to geometry using object snaps

One thing is certain. we'll never create a drawing by simply free picking points on screen. If we want to draft accurately, we'll need to know how to use Object Snaps. Object Snaps allow us to lock on the specific coordinates on our geometry. Before we get started, take a look at my status bar. Notice the only Mode settings that I am running are Grid and Dynamic Input. If you are going to work along with me, make sure that your Mode settings match mine. On my screen, I have two rows of geometry: this row above represents finished shapes and the row beneath represents incomplete line work.

Locking to geometry using object snaps

One thing is certain. we'll never create a drawing by simply free picking points on screen. If we want to draft accurately, we'll need to know how to use Object Snaps. Object Snaps allow us to lock on the specific coordinates on our geometry. Before we get started, take a look at my status bar. Notice the only Mode settings that I am running are Grid and Dynamic Input. If you are going to work along with me, make sure that your Mode settings match mine. On my screen, I have two rows of geometry: this row above represents finished shapes and the row beneath represents incomplete line work.

Our goal in this lesson is to take the geometry that we see below and complete it such that it looks like the geometry we see above. I am going to pan the drawing over a little bit and we'll zoom in on this left side and we'll start with the rectangular shape. To finish this shape, I am going to use the Line command. So, I'll move up and launch Line and then I would like to start my line from the end point of this line. Now, I know that end point has a coordinate and I could wave around here and try and figure out what that is, but you know what, that wouldn't be very accurate.

Instead, I am going to use an Object Snap. I am going to hold my Shift key and right click, this brings up the Object Snap menu and we can use this menu to lock on to specific coordinates. I am going to select end point and then I'll click on this line segment. Notice how AutoCAD is locked on to that endpoint. To finish my line, I'll hold my Shift key and right click. I'll select Endpoint from the menu and I'll click on this line segment and then I'll hit Escape to exit the command.

To finish the shape, I'll hit my Spacebar to go back into the Line command. I'll Shift+right-click to bring up the menu and I'll select Endpoint. Let me mention this. AutoCAD will select the endpoint closest to your cursor. You don't have to be all the way on the endpoint to select it. As long as you are 50% of the way or greater along your line segment, AutoCAD will find the appropriate endpoint. So, if I click right here, AutoCAD snaps to that location. To finish my line, I'll Shift+right- click to bring up the menu, I'll select Endpoint and I'll click on this segment and hit Escape.

That is the Endpoint object snap. I am going to zoom out a little bit. we'll pan this over and to complete this drawing, we'll need the Circle command. So I'll move up and launch Circle. I would like to start my circle from the mid-point of this line. So I am going to Shift+right-click, I'll select Midpoint from the menu and then I'll click on this segment. Notice the icon for Midpoint is different than the icon that we see for Endpoint. Now, as I pull this out, I don't know what the radius of this circle is, but you know what, it doesn't matter.

I know that the radius goes out to the Shift+right-click> Endpoint of this line. Let's pan this over a little bit. To finish this drawing, I am going to launch the Line command. I would like to create my line from the Shift+ right-Click>Intersection of these two lines. I am going to click right at that intersection and then I'll Shift+right-click, I'll select Intersection from the menu and I'll click this intersection and I'll hit Escape. Then, I'll launch the Circle command and I would like to place the center of my circle at the intersection of this line segment and this one.

Unfortunately, I don't have a hard intersection that I can click on, but you know what, the Object Snap will still work. If I Shift+right-click, I'll select Intersection, and then I'll click on this segment and I'll move over and click on this segment and AutoCAD finds their extended intersection. Finally, the radius of this circle can be defined by the Shift+right-click>Endpoint of this line. Let's pan this over. This time we are going to look at the Center object snap.

To complete this drawing, I am going to launch the Line command and I'd like to create my line from the Shift+ right-click, I'll select Center. When you are grabbing a center point, think of your cursor as being AutoCAD's eye. If I place my eye on the arc, notice AutoCAD finds the center. if I click, AutoCAD will snap to that coordinate. I would like to draw this line to the Shift+right-click>Center, I'll click on this arc, and then I'll hit Escape to exit the command. It looks like we'll have to mix up a few Object Snaps to finish this drawing.

I am going to launch my Circle command and I'd like to create the circle from the Midpoint of this line and I'll like to draw it to the Intersection, right here. Let's pan this over a little further. This time we are going to look at the Quadrant object snap. I am going to select this circle momentarily. Take a look at these blue squares. These guys represent the quadrant locations on the circle. You can find the Quadrant object snaps at the North, South, East, and West locations of an arc or circle.

I am going to hit Escape to deselect this. I'll launch my Line command and I would like to create my line from the Shift+right-click, I'll select Quadrant, and I'll click the arc. Notice that AutoCAD will find the quadrant closest to your cursor. I am going to click right here. I'd like to draw this to the Quadrant here, to the Quadrant here, to the Quadrant here.

Let's go to the center point now. I'll select Center. I'll click on the arc to find the center location and then I am going to right-click and select Close to finish the drawing. Let's pan this over a little further. This time we are going to look at the Perpendicular object snap. I am going to launch my Line command and I'd like to start my line from the Midpoint of this line and I would like to draw that to the Shift+right-click>Perpendicular, and then I'll select this segment.

Notice, I can click any place I like along this segment and AutoCAD will find the perpendicular location. Perpendicular means I am creating a 90 degree angle. Now, perpendicular also works in reverse. I am going to hit the Spacebar to go back into the Line command. I'll Shift+right-click and select Perpendicular and then I'll click this line segment first. Notice, as I pull away, I am creating a line segment that is perpendicular from that original entity. I would like to draw this line to the Shift+right-click>Midpoint of this line and I'll hit Escape.

Let's pan this over a little bit further and this time we'll look at the Tangent object snap. Tangent allows us to snap to a tangent point on an arc or circle and just a quick definition. If a straight segment is tangent to an arc, it intersects the arc at one and only one point. I am going to move up and launch the Line command and I'd like to start my line from the Shift+right-click>Tangent. I will click this arc and as I pull away, notice I hit the Rubber Band effect but AutoCAD is maintaining tangency with that arc.

I would like to draw this line to a point Shift+right-click>Tangent to this arc and I'll hit Escape. Let's hit the Spacebar to go back into the Line command. I would like to start my line from tangent to this arc to a point tangent to this one and I'll hit Escape. From this moment on, we will always use Object Snaps as we draw. Using Object Snaps is the only way to guarantee we're creating accurate geometry.

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This video is part of

Image for AutoCAD 2011 Essential Training
AutoCAD 2011 Essential Training

100 video lessons · 20285 viewers

Jeff Bartels
Author

 
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  1. 2m 8s
    1. Welcome
      1m 29s
    2. Using the exercise files
      39s
  2. 23m 33s
    1. Understanding model space
      3m 44s
    2. Accessing AutoCAD's tools
      3m 2s
    3. Leveraging dockable palettes
      3m 1s
    4. Monitoring the Status bar
      1m 28s
    5. Understanding the anatomy of a command
      2m 14s
    6. Customizing AutoCAD's preferences
      3m 13s
    7. Accessing help
      3m 38s
    8. Saving a workspace
      3m 13s
  3. 19m 42s
    1. Opening an AutoCAD drawing
      3m 2s
    2. Understanding mouse functions
      2m 44s
    3. Zooming, panning, and regenning
      4m 24s
    4. Working in a multiple-document environment
      2m 39s
    5. Saving your work
      2m 29s
    6. Saving time with templates
      4m 24s
  4. 14m 35s
    1. Constructing lines
      2m 20s
    2. Locking angles with the Ortho and Polar modes
      4m 49s
    3. Drawing circles
      4m 10s
    4. Activating the Heads-Up Display
      3m 16s
  5. 14m 48s
    1. Defining a unit of measure
      6m 28s
    2. Constructing geometry using architectural measurements
      4m 6s
    3. Working with metric units
      4m 14s
  6. 23m 45s
    1. Understanding the Cartesian coordinate system
      4m 53s
    2. Locking to geometry using object snaps
      7m 42s
    3. Automating object snap selection
      7m 26s
    4. Using temporary tracking to find points in space
      3m 44s
  7. 19m 30s
    1. Drawing rectangles
      4m 56s
    2. Drawing polygons
      3m 4s
    3. Creating an ellipse
      5m 9s
    4. Organizing with hatch patterns
      6m 21s
  8. 29m 46s
    1. Making geometric changes using the property changer
      3m 38s
    2. Moving and copying elements
      4m 28s
    3. Rotating elements
      3m 48s
    4. Trimming and extending geometry
      5m 10s
    5. Creating offsets
      6m 16s
    6. Erasing elements
      2m 46s
    7. Undoing and redoing actions
      3m 40s
  9. 11m 52s
    1. Selecting objects using windows
      3m 46s
    2. Adding and removing from selections
      3m 43s
    3. Using keyboard shortcuts
      4m 23s
  10. 51m 12s
    1. Creating fillets
      3m 52s
    2. Creating chamfers
      3m 51s
    3. Copying objects into a rotated pattern
      4m 20s
    4. Copying objects into a rectangular pattern
      4m 58s
    5. Stretching elements
      4m 4s
    6. Creating mirrored copies
      2m 12s
    7. Scaling elements
      5m 0s
    8. Leveraging grips
      7m 20s
    9. Exploding elements
      5m 47s
    10. Joining elements together
      3m 44s
    11. Editing hatch patterns
      6m 4s
  11. 32m 19s
    1. Understanding layers
      2m 43s
    2. Creating and adjusting layers
      7m 20s
    3. Using layers to organize a drawing
      9m 17s
    4. Changing popular settings using the layer control
      3m 30s
    5. Understanding the BYLAYER property
      3m 37s
    6. Restoring previous layer states
      3m 42s
    7. Using existing geometry to set the current layer
      2m 10s
  12. 37m 43s
    1. Creating single-line text
      3m 11s
    2. Justifying text
      5m 18s
    3. Controlling appearance using text styles
      6m 10s
    4. Annotating with multi-line text
      5m 10s
    5. Editing text
      4m 32s
    6. Creating bulleted and numbered lists
      3m 29s
    7. Incorporating symbols
      5m 28s
    8. Correcting spelling errors
      4m 25s
  13. 28m 37s
    1. Creating general dimensions
      4m 13s
    2. Creating continuous and baseline dimensions
      2m 13s
    3. Controlling appearance using dimension styles
      4m 57s
    4. Modifying dimensions
      6m 6s
    5. Creating multileaders
      2m 53s
    6. Controlling appearance using multileader styles
      3m 23s
    7. Modifying multileaders
      4m 52s
  14. 25m 19s
    1. Inserting blocks
      4m 34s
    2. Creating blocks
      6m 41s
    3. Leveraging blocks
      5m 39s
    4. Redefining blocks
      3m 1s
    5. Building a block library
      5m 24s
  15. 13m 50s
    1. Querying a drawing using rollover tooltips
      2m 9s
    2. Taking measurements using the Distance command
      3m 2s
    3. Modifying properties using the Quick Properties tool
      4m 25s
    4. Automating calculations using the Quick Calculator feature
      4m 14s
  16. 36m 6s
    1. Creating quick plots
      6m 4s
    2. Selecting a pen table
      5m 48s
    3. Choosing line weights
      4m 32s
    4. Creating a layout, pt. 1: Choosing a paper size
      2m 42s
    5. Creating a layout, pt. 2: Inserting a title block
      2m 29s
    6. Creating a layout, pt. 3: Cutting viewports
      6m 9s
    7. Reusing layouts
      4m 3s
    8. Organizing layouts
      4m 19s
  17. 16m 49s
    1. Using the Annotative property to automatically size text
      4m 13s
    2. Using the Annotative property to automatically size dimensions
      4m 34s
    3. Using the Annotative property to automatically size multileaders
      3m 58s
    4. Changing the scale assigned to annotations
      4m 4s
  18. 6m 56s
    1. Saving drawings to other formats
      2m 27s
    2. Plotting to the Design Web format
      2m 15s
    3. Plotting to PDF
      1m 20s
    4. Sending drawings via email
      54s
  19. 22s
    1. Goodbye
      22s

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