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Trimming and extending geometry

From: AutoCAD 2011 Essential Training

Video: Trimming and extending geometry

In this lesson we are going to learn how to clean up our geometry. We are going to look at the Trim and Extend commands. Trim and Extend help us correct our line work after we have made changes. On my screen I have some simple geometry. Let's say I'd like to remove this line work on the inside of this small circle. To do that, I will launch the Trim command. Trim is located in the Modify panel of the Ribbon. The icon is right here. Now that I have launched the tool, take a look at the command line. AutoCAD is asking me to select a cutting edge. When we use the Trim command, we are essentially using one object to cut another.

Trimming and extending geometry

In this lesson we are going to learn how to clean up our geometry. We are going to look at the Trim and Extend commands. Trim and Extend help us correct our line work after we have made changes. On my screen I have some simple geometry. Let's say I'd like to remove this line work on the inside of this small circle. To do that, I will launch the Trim command. Trim is located in the Modify panel of the Ribbon. The icon is right here. Now that I have launched the tool, take a look at the command line. AutoCAD is asking me to select a cutting edge. When we use the Trim command, we are essentially using one object to cut another.

So I am going to select this circle as my cutting edge and then I will right-click. Then I will click the objects I'd like to Trim, and when I am finished, I will hit my Esc key. Notice AutoCAD trimmed those entities back to meet that cutting edge. Let's take a look at the exact opposite situation. Maybe I have had a design change. I am going to select this circle and then I will come over to my Property Changer, and I will change its radius to 5. I will hit Enter, and then I will move outside the palette and I will hit Esc to deselect the circle. Now, instead of my lines being too long, they are too short.

I would like to project my lines to meet this circle. To do that, I will use the Extend command. Extend is also located in the Modify panel. I am going to click this fly-out. Notice that Trim and Extend share the same menu. I will select the command and if we look at the command line again, this time AutoCAD is asking us for a boundary edge. Now, Trim and Extend work the exact same way, except instead of this edge cutting my objects, this edge will be used as the stopping point for my projected geometry.

I am going to select this circle as my boundary edge and I will right-click, and then I will click on each of these entities to project it to meet my boundary edge. When I am finished, I will hit Esc. Now, I'd like to show you a shortcut, because the Trim and the Extend commands are so similar that we can launch one from within the other. Let's pan this over a little bit. On my screen I have some simple line work. Let's see if we can convert this geometry into the shape of the ladder. To do that, I am obviously going to have to extend some of these lines and I will have to trim some of the others.

I am going to start by launching the Extend command since that was the one we used last, and then I will select this edge, and this edge as my boundary edges, and I will right-click. I will then click to extend this entity, and this one, this one, and this one. And instead of getting out of the command and launching Trim to finish this up, take a look at my cursor. If I hold my Shift key, I can toggle to the Trim command. By holding down Shift, the boundary edges become cutting edges. So I can click this entity, this one, I can trim this one, and this one.

When I am finished, I will hit Esc. So by holding down the Shift key, we can easily toggle from one command to the other. Alright! Now that we understand how to use Trim and Extend, let's try it out in a practical example. I am going to pan my drawing over. On my screen, I have a pair of windows. let's see if we can modify this window, such that it looks like the one on the right. First thing I am going to do is create the arched top. To do that, I will use the Circle command and I'd like to create my circle from the Shift+Right-click, mid-point of this line, and the circle dimension, I can get right down here.

the diameter of the circle must be 39. So I am going to right-click to access the Diameter sub-option, and then I will type 39, and hit Enter. Now, I am going to create the circle for this arc on the inside. We can get the dimension right here. I can see the radius of that circle is an inch-and-a-half less than the previous one. So I am going to re-launch the Circle command, I'd like to create my circle from the center of this one, and take a look at the command line. I can see the radius of the previous circle was 19.5.

If I take one-and-half away from that, the radius of this circle must be 18, Enter. Let's zoom-in a little bit. Now, I can start cleaning up my geometry. I am going to launch the Trim command, and I will select this line as my cutting edge, and I will right-click, and I would like to remove the bottom half of these circles, and then I will hit the Esc key. Now, I don't need these little ends out here. So I am going to launch the Trim command again. I will select this arc as my cutting edge and I will right-click and now I will click to remove these ends.

Now, before I exit the command, I am going to hold down my Shift key, and then I will click each of these lines to project them up to meet that edge. Now that I am finished, I will hit Esc. Okay, the only thing I have left to do is remove a whole bunch of little tiny pieces. Once again, I will launch the Trim command, and instead of selecting a whole bunch of cutting edges, take a look at my cursor. I can either select objects or if I hit Enter, everything in this drawing becomes a cutting edge. Now, it's very easy. I can just come around here and click all the pieces that I'd like to remove and when I am finished, I will hit Esc.

As you can see the Trim and Extend commands have essentially the same workflow, jumping from one to the other is as simple as pressing your Shift key. Knowing how to use both of these commands will allow you to quickly and accurately clean up your geometry.

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This video is part of

Image for AutoCAD 2011 Essential Training
AutoCAD 2011 Essential Training

100 video lessons · 20310 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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