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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.
If you have ever used a copy machine to make enlargements or reductions of images you are already familiar with the concept of scale. Just like we can make our images larger or smaller using a copy machine, we can make our entities larger or smaller by using the Scale command. Let's play around with Scale. I'm going to open a couple of drawings, I'm going to come up and click on my Open icon. Inside the Chapter 9 folder within our Exercise Files directory I'm going to scroll down, I have got 3 drawings that I would like to use within my Chapter 9 Demonstration.
So I'm going to click my MP3 player drawing and highlight it. And then I'm going to hold my Shift key and I'm going to click the Basketball drawing and I have highlighted all 3 of these files. Now I'm going to come over and click my Open button and AutoCAD will open all three of these drawings. Since AutoCAD supports the multiple document environment, each of these drawings is open. For right now we are going to work with the MP3 player. Let's say I would like to make a design change to this guy. I would like to change the size of the thumbwheel. I can do that by using the Scale command.
If I would like to adjust the Scale, I'm going to come over to my Modify toolbar and click my Scale icon. When I do AutoCAD is asking me to select objects, which objects would I like to resize. Now I do have several objects here so I'm going to click on the upper left hand corner outside my thumbwheel and we will create a nice window around all of these entities. Let me click to finish the window. And then we will right-click so that AutoCAD knows we have done selecting objects. Now that they are selected AutoCAD is asking to me to specify a base point. At what point what I like my geometry to get larger or smaller.
Well, I'm going to use the center point of the thumbwheel and I happen to have a running Object Snap set for center. So I'm going to move my cursor around to the Arc and click, notice that I move my cursor, I'm getting a rubber-band effect for my scale. Now I could free pick a point on the screen if I wish but instead I'm going to type in a Scale factor. Notice that the current Scale factor setting is 1. 1 means essentially no change, there would be a one to one scale. I'm going to type in 0.5 for my scale and hit Enter.
I just converted that thumbwheel to half its original size. Let's scale it again. I'm going to access Scale from the right-click, I'm going to right-click, go to Repeat Scale, select Object, let's use a key in. How about if I set P for Previous and hit Enter? I just re-selected that geometry. Let me right-click to finish the selection, specify base point once again I'm going to make this larger or smaller based on it center point. So I'm going to move my cursor onto the Arc and click and this time I'm going to apply a Scale factor of 2.
I would like to make this thumbwheel twice as big as it is right now. When I hit Enter, I just change the Scale. Now this is an example of using the Scale command for a design change. Scale also comes in handy when we have trouble with our units. Let me show you what I mean. I'm going to close this drawing. Let me come up and click little x to close this drawing. And remember that I still have two other drawings open. Let's do a side-by-side comparison. I'm going to come up to my Window pulldown and I am going to come down and select tile vertically, this will give me a nice side-by-side of each of my drawings.
If I click in a window that window becomes active so I can adjust my view. Let me pen this guy a little bit. Let me click in my Basketball drawing, we will pen him over just a little bit. Now the drawing on the left was created such that one unit equals 1 foot. The drawing on the right was created such that one unit equals one inch. Watch this I'm going to drag my basketball from its drawing into the Basketball Court drawing. I can do that by clicking on the entity and as soon as it highlights I'm going to click and hold on the dashed line and I can drag this into the court drawing.
I will release, notice my basketball is coming in way too big. Why, because in this drawing AutoCAD just sees 9.39. So when the basketball comes in it's coming in at 9.39 feet in diameter. Let me zoom in and let's correct the Scale. I'm going to change the Scale by launching my Scale command, let me come over and click the Scale icon. And in the Select objects prompt, I will select my basketball and then I will right-click to finish my selection.
Base point let's scale him about the center point I will just move my cursor on the Arc because I have a running Object Snap set for center. And I will click, and what is my Scale factor, well the difference between inches and feet is 112. So I'm going to type in 1/12 just like the fraction. And when I hit Enter I have just scaled that basketball to the appropriate size. In fact if I was to use the Move command, select my basketball, specify a base point, we will pick any point here, will zoom in, it will in fact fit through the hoop now.
Whether we need to resize our entities is part of a design change or to correct the difference in drawing units we can accurately make our entities larger or smaller by using the Scale command.
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