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Autocad for dummies - Byrnes D.

Byrnes D. Autocad for dummies - Wiley publishing, 2007. - 435 p.
Download (direct link): autocad2006.pdf
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AutoCAD prompts for the upper-right corner. The command line reads:
Specify upper right corner <12.0000,9.0000>:
50 Part I: AutoCAD 101
Figure 3-2:
Starting a new drawing from a template.
8. Type 100,75 (no spaces) and press Enter.
The values you enter appear in the dynamic input tooltip and the command line.
100 x 75 corresponds to 10 inches by 7.5 inches (a little smaller than an 8.5-x-11-inch piece of paper turned on its long side) times a drawing scale factor of 10 (because you’re eventually going to plot at 1:10 scale). See Chapter 4 for more information about drawing scales.
9. Right-click the SNAP button on the AutoCAD status bar and choose Settings.
The Snap and Grid tab of the Drafting Settings dialog box appears, as shown in Figure 3-3. (In AutoCAD LT, the dialog box might look slightly different.)
10. Change the values in the dialog box, as shown in Figure 3-3: Snap On checked, Grid On checked, Snap X Spacing and Snap Y Spacing set to
0.5, and Grid X Spacing and Grid Y Spacing set to 5.
(When Equal X and Y Spacing is checked, changing the X spacing value causes the Y spacing to automatically update to the same number, thereby saving you typing.)
Snap constrains your crosshairs to moving in an invisible grid of equally spaced points (0.5 units apart in this case). Grid displays a visible grid of little dots on the screen (5 units apart in this case), which you can use as reference points. The grid doesn’t appear on printed drawings.
11. Click OK.
You see some grid dots, 5 units apart, in the drawing area. If you move your mouse around and watch the coordinate display area on the status bar, you notice that it moves in 0.5-unit increments.
Chapter 3: A Lap Around the CAD Track 51
Figure 3-3:
Snap and Grid settings.
12. Choose ViewOZoomOAll.
AutoCAD zooms out so that the entire area defined by the limits — as indicated by the grid dots — is visible.
13. Click the Save button on the Standard toolbar or press Ctrl+S.
Because you haven’t saved the drawing yet, AutoCAD opens the Save Drawing As dialog box.
14. Navigate to a suitable folder by choosing from the Save In drop-down list and/or double-clicking folders in the list of folders below it.
Remember where you save the file so you can go back to it later.
15. Type a name in the File Name edit box.
For example, type Detail or My Plate is Base.
Depending on your Windows Explorer settings, you may or may not see the .dwg extension in the File Name edit box. In any case, you don’t need to type it. AutoCAD adds it for you.
16. Click the Save button.
AutoCAD saves the new DWG file to the folder that you specify.
Whew — that was more work than digging a post hole — and all just to set up a simple drawing! Chapter 4 goes into more detail about drawing setup and describes why all these gyrations are necessary.
52 Part I: AutoCAD 101_______________________________________________________________
Drawing a (Base) Plate
With a properly set up drawing, you’re ready to draw some objects. In this example, you use the RECTANG (REC) command to draw a steel base plate and column, the CIRCLE (C) command to draw an anchor bolt, and the POLYGON (POL) command to draw a hexagonal nut. (Both the RECTANG and POLYGON commands create polylines — objects that contain a series of straight-line segments and/or arc segments.)
AutoCAD, like most CAD programs, uses layers as an organizing principle for all the objects that you draw. Chapter 5 describes layers and other object properties in detail. In this example, you create separate layers for the base plate, the column, and the anchor bolts, which may seem like layer madness. But when doing complex drawings, you need to use a lot of layers in order to keep things organized.
Rectangles on the right layers
The following steps demonstrate how to create and use layers, as well as how to draw rectangles. You also see how to apply fillets to objects and offset them. (Chapter 5 describes layers in detail, and Chapter 6 covers the RECTANG command. Chapter 7 explains the FILLET (F) and OFFSET (O) commands.) Start by creating a Column layer and a Plate layer, and then drawing a column on the Column layer and drawing a square base plate on the Plate layer by following these steps:
1. Make sure that you complete the drawing setup in the previous section of this chapter and have the drawing open in AutoCAD.
2. Click the Layer Properties Manager button on the Layers toolbar.
The LAYER (LA) command starts and AutoCAD displays the Layer Properties Manager dialog box as shown in Figure 3-4.
3. Click the New Layer button.
AutoCAD adds a new layer to the list and gives it the default name Layer1.
4. Type a more suitable name for the layer on which you’ll draw the column and press Enter.
In this example, type Column.
5. Click the color swatch or name (white) in the Column layer row.
The Select Color dialog box appears.
Chapter 3: A Lap Around the CAD Track 53
Figure 3-4:
Creating a new layer.
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