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Constructing a 2D drawing

From: AutoCAD 2011: Migrating from Windows to Mac

Video: Constructing a 2D drawing

Even though the arrangement of our tools looks different between the Windows and Mac version of AutoCAD, the functionality of the tools is virtually identical. For this reason, you will find that making the transition from the Windows platform to the Mac requires almost no learning curve. In this lesson, I am going to demonstrate a typical 2D workflow by creating a small mechanical part. On my screen, I have a finished example of the part we will be creating; we will be drawing everything except for the dimensions. In the interest of time, I have already created my layers. I am going to open up the layer control and I will set the center lines layer current.

Constructing a 2D drawing

Even though the arrangement of our tools looks different between the Windows and Mac version of AutoCAD, the functionality of the tools is virtually identical. For this reason, you will find that making the transition from the Windows platform to the Mac requires almost no learning curve. In this lesson, I am going to demonstrate a typical 2D workflow by creating a small mechanical part. On my screen, I have a finished example of the part we will be creating; we will be drawing everything except for the dimensions. In the interest of time, I have already created my layers. I am going to open up the layer control and I will set the center lines layer current.

Let's start by creating this vertical centre line. I will do that by launching the Line command. I am going to start my line right here and my Ortho was locked which is great. I will pull this up and click and then I will press Escape to finish the command. Now let's recreate this horizontal centerline. I am going to press the Space Bar to go right back into the Line command, and I'll click right about here, I will pull this over to the left and click, and then I will press Escape.

Now I have a nice intersection where I can start building my geometry. This intersection represents the central location of these circles. I am going to open the layer control and I will set the part layer current, then I will launch the Circle command. I will create my circle at the Shift Right-Click to bring up my objects snap overrides. I will select Intersection and I will click right here, will create the larger circle first, this guy has a radius of 3.15. I am going to press the Space Bar to repeat the Circle command.

Let's create the next circle at the center of this one; a heavy running object snap set for center and this guy has a diameter of 3. Now if we look at the command line, we can see that I have the same options that I have on the Windows version. I could press D for diameter or I can right click and select Diameter from the menu. I am going to enter 3 and I will press Return. All right, let's take care of this circle of above. What I am going to do is offset this centerline up, 5.65 units.

I will launch the Offset command. My distance is 5.65. I will select my line, and then I will click to this side. When I am finished, I will press Escape. Let's launch the Circle command again. I will create a circle at the intersection right here. We will do the smaller circle first this time. This one has a diameter of 1.6. Let's repeat the Circle command by pressing the Space Bar. I will select the center of this circle and the larger circle has a radius of 1.65.

To create these lines that connect the circles, I am going to use the Line command. I will start my line from my point tangent to this arc and I will draw to a point tangent to this arc, and I will press Escape. Now I can use the same workflow to create the line on the other side or I could launch the Mirror command. I will select my geometry and press Return, and I then I will define my mirror line by selecting the endpoint here, and since my Ortho was locked, I really don't have to be specific with the next point.

I can just pull it straight down and click and then press Return to finish the command. Let's take care of this notch. I am going to find the left edge first; I will do that by offsetting my centerline to the left half this distance. I will launch the Offset command, now what is my distance? I am going to type a 'cal. I am going to launch the internal calculator and my Expression will be 1.25 divided by 2. I will then select the line and click to the side.

When I am finished, I will press Escape. To create the geometry, I am going to use the Rectangle command. I would like to create my rectangle at the intersection right here. Then I will right-click. I would like to create this using the Dimensions option. I know that my rectangle has a length of 1.25 and it has a width of 0.75. Finally I will click on screen to set the opposite corner of the rectangle.

All right, to clean up this geometry, I am going to use the Trim command. I would like to use this edge, this one, this one and this one as cutting objects and I will press Return. And I would like to trim this line, and this one and this one. Now I don't need this vertical line anymore. I am still in the Trim command. I am going to right click. There is an Erase option here. I will select that, I will click my line and then I will press Return. When I am finished, I will click the Escape key.

To make my centerline extensions a consistent length, I am going to offset the outside of this part to 0.5 units. So let's launch the Offset command. My distance is 0.5. I will offset this line out, this one, this one and this one, and I will press Return. Then I will launch the Trim command. I will select this line, this one, this one and this one and press Return, and I will trim off the extensions here.

I will use another crossing window to get these. I will select this one and this one, when I am finished, I will press Return. To erase this extra geometry, I'm going to launch the Erase command and at the Select object's prompt, I am going to type P for previous, and AutoCAD reselects my previous selection. I will then press Return again to finish the command. Before we finish, I would like to do one more thing: I would like to clean up the centerlines. These always looks nicer when the dashes fall at the centers of the circles.

Unfortunately, there is no automatic process to do this; we have to do it manually. So what I am going to do is zoom-in and I am going to create a couple of circles that represent the size of the gap, and the size of the dash. Let's launch the Circle command and I will create a circle from the center of this one and I will place my circle right here. The diameter of the circle represents the size of the gap. I am going to go right back into the Circle command, I will create it at the center of this circle, and I will pull this circle into here.

The diameter of this circle represents the size of the dash. I can now use these circles to trim and clean up my centerlines. Now I do need one extra set, let me back up a little. I will launch Copy command and I will select these circles. I will copy them from the center of this circle to the center of this one and I will press Escape. Next, I will launch Trim command, I will make a window selection to grab these circles, and I will press Return.

And I will trim out this piece and this one, this one and this one, and I will press Return. Finally, I am going to erase the extra circles. I will do that by launching the Erase command. I will type P for previous and I will press Return. As you can see, once you get used to the streamlined interface, it's very easy to hit the ground running. Since the Mac version of AutoCAD lets you leverage your current AutoCAD skills, you could be productive with your very first drawing.

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AutoCAD 2011: Migrating from Windows to Mac

35 video lessons · 4150 viewers

Jeff Bartels
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