Because you may not know all of a project’s requirements when it begins you usually base the first draft of a design on projected needs. As the plan goes forward, you make adjustments for new requirements as they arise. As more people enter the project additional design restrictions come into play and the design is further modified. This process continues throughout the project from the first draft to the end product.
In this chapter, you will review much of what you’ve already learned. Through out the process, you will look at some techniques for setting up drawings to help manage the continual changes a project undergoes. You will also be introduced to new tools and techniques you can use to minimize duplication of work. AutoCAD can be a powerful timesaving tool if used properly. TIUschapter examines methods of harnessing tha t power
Editing More’ Efficiently
The apartment building plan you’ve been working on is currently incomplete For example, you need to add the utility room you created in Chapter 11. In the real world, this building plan would also undergo innumerable changes as the project developed. Wall and door locations would change, and more notes and dimensions would be added. However, in the space of this book’s tutorials this
book can’t develop these drawings to full completion. But it can give you a sample of what is in store while using AutoCAD on such a project
In this section you will add a closet to the Unit plan (you will update the Plan file later in this chapter). In the editing you’ve already done you’ve found that you use the following commands frequently Move Offset Fillet Trim overrides. Now you willleam some ways to shorten your editing by using them more efficiently.
Editing an Existing Drawing
First, let’s look at how you can add a closet to the Unit plan. You’ll begin by copying existing objects to provide the basis for the closet.
1. Open the Unit file.
2. Make Wall the current layer by trying the following: Click the Make Object’s Layer Current tool on the Object Properties toolbar and then click a wall line.
3. Make sure the Notes and FIr-pat layers are frozen. This will keep your drawing clear of objects you won’t be editing.
If you didn’t create a Unit plan you can use 12a-uni t. dwg from the companion CD-ROM.
4. If they are not already on turn on Noun/Verb Selection and the Grips feature. Also turn off Running Osnaps and Polar Tracking for now. They may get in the way of point selection in these exercises.
5. Click the right-side wall and then click its midpoint grip.
6. Enter C…Ito start the Copy mode then enter @2′<180…l. Metric users should enter @60<180.J (see Figure 12.1).
7. Press the Ese key to exit the Grip mode.
8. Zoom in to the entry area shown in Figure 12.2.
9. Click Offset on the Modify toolbar or type 01.
10. At the Offset stance 0 r the rough: prompt use the Nearest Osnap and pick the outside wall of the bathroom near the door as shown in Figure 12.2.
11. At the Second point: prompt use the Perpendicular Osnap override and pick the other side of that wall (see Figure 12.2).
12. Click the copy of the wall line you just created, and then click a point to the left of it.
13. Press .J to exit the Offset command
In steps 9 and 10 of the previous exercise, you determined the offset distance by selecting existing geometry. If you know you want to duplicate a distance but don’t know what that distance is, you can often use existing objects as references.
Next use the same idea to copy a few more lines for the other side of the closet.
1. Click to highlight the two horizontal lines that-make up the wall at the top of your view.
2. Shift-scnck the midpoint grips of these lines (see Figure 12.3).
3. Click again one of the midpoint grips and then enter C.J to select the Copy option.
4. Enter B.J to select a base point option.
5. Use the upper-right comer of the bathroom for the base point and the lower right corner of the kitchen as the second point.
6. Press the Ese key twice to clear the grip selection
In these exercises you are asked to enter the grip options through the keyboard. This can be a quicker method to access the Copy and Base grip options You can also right-click your mouse and select the Copy and Base options from the popup menu.
Now you’ve got the general layout of the closet. The next step is to clean up the comers. First you’ll have to do a bit of prep work and break the wall lines near the wall intersections as shown in Figure 12.4
1. Click Break on the Modify toolbar. This tool creates a gap in a line arc or circle.
2. Click the vertical wall to the far right at a point near the location of the new wall (see Figure 12.4).
3. Click the vertical line again near the point you selected in step 2 to create a small gap as shown in Figure 12.4. .
4. Use the Break tool again to create a gap in the horizontal line at the top of the unit near the door as shown in Figure 12.4.
5. Click Fillet on the Modify toolbar or type F.J and join the comers of the wall as shown in Figure 12.5.
If Fillet is not trimming lines type Trimmode-l U. This sets the Trimmocle system variable to 1 which causes the Fillet and Chamfer tools to “trim” objects back to their intersection points
Insteps 2 and 3 above, you didn’t have to be too exact.about where to pick the break points because Construct :> Fillet takes care of joining the wall lines exactly.
Now you are ready to add the finishing touches.
1. At the closet door location draw a line from the midpoint of the interior closet wall to the exterior (see the top image of Figure 12.6). Make sure this line is on the Jamb layer .
2. Offset the new line 3′ in both directions (90cm for metric users). These new lines are the closet door jambs.
3. Erase the first line you drew at the midpoint of the closet wall.
4. Click Trim on the Modify toolbar or type Tr
5. Click the two jambs, and then press .J.
6. Type F.J to invoke the Fence selection option; then click a point to the left of the wall as shown in the bottom image of Figure 12.6.
7. As you move the cursor you see a rubber-banding line from the last point you picked. Click a point to the tight of the closet wall so the rubber-banding line crosses over the two wall lines, as shown in the top image of Figure 12.6.
8. Press .J to finish -vour fence selection. The wall lines trim back to the jambs
9. Press .J again to exit the Trim command.
10. As shown in Figure 12.7, add the door headers and the sJriding doors and assign these objects to their appropriate layers.
11. Use File >Save to save the file. If you used the file from the companion CD-ROM, use File> Save As and save the file under the name Unit
You can.use the Match Properties tool to make a set of objects match the layer of another object. Click Match Pperties on the Standard toolbar seler title objects whose layer you want to match and then select-the objects you want to ass~n to the objects layer. SeeChapter 6 for-more on the Match Properties tool.
In this exercise, you Used the Fence selection option to select the objects you wanted to trim. You could have selected each line individuallv by clicking them but the Fence selection option offered ‘you a quick way to select a set of objects without having to be too precise about where they are selected. You’ll get a closer look at the Fence selection option a bit later in this chapter.
This exercise also showed that it’s easier to trim lines back and then draw them back in than to try to break them precisely at each jamb location. At first this may seem counterproductive, but trimming the lines and then drawing in headers actually takes fewer steps and is a less tedious operation than some other routes. And the end result is a door that is exactly centered. on the closet space.