Learn Auto CAD basics in 21 lessons PDF

Preview

Summary

2317-asignment - Lecture notes 7,6...

Description

Learn AutoCAD basics: LESSON 1 Learning AutoCAD Basics Coordinate system In AutoCAD, the Drawing Area is composed of a sheet in which every location has the particularity of having its own coordinate represented by x, y and z.

Since we are going to be solely working in 2D in this series, we can forget about the z component of the coordinate system. Looking at the following image, you will notice that each corner of the figure has coordinates

Page 1 of 75

Though it is true you won’t be using this a lot while drawing in AutoCAD, we will spend a minute talking about it. At this point, I will suggest you disable the Dynamic input before trying the following. We will try creating the previous image using the coordinate system and the command window. It is simple, the concept will be to use the four points to draw the quadrilateral. To do that using AutoCAD: 1. Type LINE and Press Enter 2. Type 9,9 and Press Enter 3. Type 25,9 and Press Enter 4. Type 20,17 Press Enter 5. Type 14,17 Press Enter 6. Type 9,9 And Press Enter 7. Press Esc The first step allows activating the LINE command. (Learn more about the LINE command) The second step allows specifying the starting point of the line and the same goes for next steps. The last Step allows to Cancel the LINE command. In AutoCAD stroking Esc (ESCAPE) allows exiting a command. At this stage, you are not using the computer mouse, and you are required to pay close attention to the command windows while drawing. As we go, we will learn more about the command windows and how to use your mouse in AutoCAD.

Exercise Use the technique we have just learned to create the following.

Page 2 of 75

Note you can start from any point.

Learn AutoCAD basics: LESSON 2 Not like the previous LESSON , we are going to start learning cool things today. Not to say that LESSON 1 was useless, that helped to warm up. We have lately learned the basic basics in AutoCAD, and you should by now know the environment and I have no doubt that you are familiar with common words used here to describe stuff such as Command window, Status Bar, Navigation bar…

Learn AutoCAD Basics We will use the image below, and try learning all things we need to learn to be able to create something similar using AutoCAD. We’ve learned a little how to use the coordinate system to create lines in AutoCAD. In this Session, we will forget a little about the Cartesian coordinate system.

Page 3 of 75

It is true that using the Cartesian coordinate system we could draw lines with specified dimension, but this method is more convenient and is the one you will be making use of in the future. Read more about how you can create lines and play with their angle

Execution To create the image above

step 1 Draw the line of 80 units 1. Click on LINE 2. Specify the first point 3. Make sure the ORTHO mode is ON, Move your mouse rightward, type 80 and Press Enter 4. Press Esc

Step 2 Start the second line from the first point of the 80 units line, and draw the second line with an inclination angle of 58 degrees.

Page 4 of 75

Step 3 Draw the third line. It is a straight horizontal line.

Step 4 All you have to do now is to create a line from the 2 open points shown on the figure in step 3.

Exercise Here is a good exercise that will help you practice what we have just learned. I will suggest you learn how to use the ROTATE command in AutoCAD before trying to do the following exercise.

Page 5 of 75

In the case of difficulties, I would like you to know that I solved this step by step a few days earlier.

Learn AutoCAD basics: LESSON 3 Tutorial45 AutoCAD tips In this post, we will be learning how to use the TRIM, CIRCLE command while trying to replicate the image below. We have, in the last session, learned how to play with the LINE command and use Options of the Status bar. We will keep on playing with those features, adding up to them few others.

Page 6 of 75

Learning AutoCAD Basics The primary figure that will help easily replicate this exercise is the following.

Page 7 of 75

Two circles and two Rectangles. What is the easiest way to get to this? 1. Create the big rectangle using the LINE command 2. Use the Center of the top side of the triangle to create the two circles. For step 2, you need to turn the Midpoint ON if you want to be able to find the center of that segment while creating the circle Here is how to do it (right click on 1 and tick 2)

Page 8 of 75

Now you should be at the following point

Trim the big circle and Erase the top side of the rectangle

Page 9 of 75

Now, all we need to do is create the small Rectangle. Given the dimensions above, if we consider that the left corner of the figure is at the point of coordinates (0,0), we need to start the small rectangle at the point of coordinates (10,15) What we will do. 1. Move the UCS to the left down corner of the figure 2. Start the line at the point (10,15)

How to move the UCS to the left down corner of the figure 1. 2. 3. 4.

Type UCS Select the point Move the cursor on the x-direction and click Move the cursor on the y-direction and click

This is what you are supposed to get

Page 10 of 75

Notice the UCS

Now you can easily start the line at the point (10,15) and create the small rectangle.

Exercise

Page 11 of 75

hey! If you have any confusion about this, Just leave a comment below. Let me know what is confusing about this, I will make it clear for you

Learn AutoCAD basics: LESSON 4 The following should have nothing new to you if you have been here since the beginning. In this session, we are going to make good use of what we have learned so far. The image below will serve as today task. All Fillet in the following exercise are 5 units. (Learn more about the FILLET command in AutoCAD)

Page 12 of 75

Learning AutoCAD Basics You do not need to know the dimension of A to be able to accurately replicate the exercise. But it is crucial to know that the value of those lines are the same, that is the reason we called it A. As I said earlier, all FILLET are R=5. We have 3 FILLET in the following exercise.

Page 13 of 75

You will need to use the UCS command to place the circle at its appropriate distance using the same technique we used in the last session. The following information will also be important to know.

Basically, there is nothing added than the FILLET command here. Ignore the FILLET, complete the figure and you can get those FILLET done at the end of the task. Feel free to drop your thoughts below in case of any question or opinion. hey! If you have any confusion about this, Just leave a comment below. Let me know what is confusing about this, I will make it clear for you

Page 14 of 75

Updates! The following information was mistakenly omitted.

Learn AutoCAD basics: LESSON 5 Hope we are providing some insights to you with this series of learning AutoCAD through exercises. We previously worked on exercises that helped us master the following:     

The use of the LINE command in AutoCAD The use of the CIRCLE command in AutoCAD The use of the TRIM command in AutoCAD The USE of the UCS command in AutoCAD and more

Today, we are going to continue learning and the object that will allow us do that is shown below.

Page 15 of 75

As you can see the only added tools here is the POLYGON command which you will have to learn if you want to successfully replicate the image above.

Learning AutoCAD Basics It is important to have you see the following.

It is important to understand that the two polygons do not have same characteristics. The Polygon on the left side of the image is a 6 side polygon circumscribed about a circle of R=20 and the Polygon on the right is a 5 side polygon inscribed in a circle of R=15. (illustrated on the image using the dashed red circle) All fillet are R=10 units and remember that you need to learn how to create a polygon in AutoCAD before attempting to do this exercise.

A trick you can use It is possible to use the FILLET command on two parallel lines.

Page 16 of 75

Using all we have learned in previous sessions you should be able to come out of this one without any hassle.

Learn AutoCAD basics: LESSON 6 In this session, we will be challenging ourselves to learn how to play with the ARRAY command in AutoCAD. The image below is one of those that may best serve this purpose. It is to be noted that all slots are equally spaced around the circles. Feel free to visit the post where we practiced and talked about the use of the ARRAY command in AutoCAD.

Learning AutoCAD Basics There is not much to be done in this one but the proper use of the ARRAY command. All you will need is to have mastered the TRIM command, the LINE command, the FILLET command and the CIRCLE command. Below we have split annotations in different figures to avoid having a bushy image. Combine all information available on the figures if you want to accurately replicate today’s exercise.

Figure 1

Page 17 of 75

Figure 2

Page 18 of 75

Figure 3 The piece in the center of the exercise.

Page 19 of 75

Execution The following image might be helpful to you to have a good start

After proper TRIMMING, you will be left with the following

Page 20 of 75

Now all you need to do is to use the FILLET command to round edges and create objects that are in the center of the figure.

Page 21 of 75

Learn AutoCAD basics: LESSON 7 The present is one of a kind. It is good to know that the objective is not only to be able to use AutoCAD commands but also to use-your-brain-cells to help combine all these commands to get to the final image. One thing you should have in mind is that there is more than a way to get to a destination using AutoCAD, just remember to check your dimensions at the end of the exercise and make sure they match ones mentioned on the image-exercise. We will look a little deeper into the OFFSET command today. It is needed.

OFFSET command in AutoCAD

Page 22 of 75

The OFFSET command helps create parallel lines and parallel curves. If you have an object and want a similar parallel object to it, this command will be helpful.

Page 23 of 75

Page 24 of 75

To use the OFFSET command 1. 2. 3. 4.

Click on the OFFSET icon Specify the OFFSET distance and Press Enter Select object to OFFSET Specify a point on side to OFFSET

Learning AutoCAD Basics The use of the ROTATE command will be required in this exercise, as well as the OFFSET command. Below you will find diverse dimensions to help the replication of this session’s task.

Figure 1

Figure 2

Page 25 of 75

Execution You need to start from the outer part of the object.

After getting the above figure done, OFFSET all circles with 10 units inwards, and OFFSET all line with 15 units inwards. And you should end up here.

Page 26 of 75

All you need to use the TRIM command and the FILLET command to get all done.

Learn AutoCAD basics: LESSON 8 Tutorial45 AutoCAD tips We hope your assessing skill has improved, meaning you are more able to judge the difficulty of an exercise just by looking at it. In this post, we are going to keep on using basic AutoCAD commands and focus more on how to combine their use to accomplish a specific task.

Learning AutoCAD Basics The following are the images we are going to be using today.

Figure 1

Page 27 of 75

Figure 2

Page 28 of 75

Execution Start by creating the following.

The first object you should create is the red circle. Then make sure the QUADRANT mode is activated in the Object snap settings, this will help you snap the center of those big circles at the point A.

Page 29 of 75

(Right click on 1 and tick 2) After proper trimming, you will end up with the following image

Use the OFFSET command on the red part to obtain the following. OFFSET distance = 12.5 units Page 30 of 75

Draw a line from the two openings of the object, and create a circle using the middle point B of the line you have just created.

Page 31 of 75

We have not talked about the small circles 30 and 60 degrees away from the vertical. Using techniques we have used to create objects in previous DAYS, those should not be a problem.

Learn AutoCAD basics: LESSON 9 Tutorial45 AutoCAD tips We slow down a little today, and we would like you to come back and use some basic commands we think we have not made use of enough. Now, we are going to look at the CHAMFER command and play with the UCS command a little bit more than we did in the past days.

Learning AutoCAD Basics Here is the object we will try replicate in this session, pretty quick one huh!?

We have been into more difficult situation!

Page 32 of 75

Execution Remember you can do it your own way, but here is how I will suggest you do it. Start with the following. Four lines, you have all dimensions, pretty easy

Then, use a line to close the object. You need not to know the length of this line, just use those two points to get it.

Page 33 of 75

Now use the CHAMFER command on the left upper corner. The Chamfer distances are 33 x 33 units. Learn how to use the CHAMFER command in AutoCAD

Page 34 of 75

We have made an extensive use of the UCS command earlier. Move the UCS to the position shown on the picture below, that will allow you to get the circles we are trying to create at their right positions.

After Getting the UCS at the position shown above, the center of the bigger circle will be at the point of coordinates (36,36) and the center of the small circle will be at the point of coordinates (84,20)

Learn AutoCAD basics: LESSON 10 Tutorial45 AutoCAD tips One of the command we have not been using since the beginning of this series is the MIRROR command. We expect to force its use with today’s session. Today’s rule will be a bit altered in the sense that we wish you use the MIRROR command. How? If you look closely at the image below you will notice that the object is a sort of symmetric. Imagine a vertical line cutting it into two, both sides will be just identical mirrored copies.

Learning AutoCAD Basics Here is the object of today’s experiment.

Page 35 of 75

We’ve said earlier that the object is symmetric, let’s see what a part of it would look like. (The line in red seeing as the line of symmetry)

Page 36 of 75

After removing all FILLET, here is what the image looks like

Page 37 of 75

Here are some information that might be helpful

Page 38 of 75

You can just do the inverse operation to mount that object walking from the last image right above this to the first image we had in the beginning of this session.

Learn AutoCAD basics: LESSON 11 Tutorial45 AutoCAD tips

Here is an exciting one! We have just noticed we needed to add more ingredient to our experiment today, for some reasons. Last LESSON , we noticed the exercise we were working on made it too easy to escape the MIRROR command, today, we are coming with one which is meant to make it almost impossible to accomplish without making use of the MIRROR command.

Page 39 of 75

Learning AutoCAD Basics Figure 1

Page 40 of 75

Figure 2

Figure 3 The two red lines are both axes of symmetry of the object.

Page 41 of 75

Figure 4 Details about the object inside the ellipse.

Figure 5

Page 42 of 75

Execution The ELLIPSE command in AutoCAD We will need to use the ELLIPSE command in this session.

To use the ELLIPSE command 1. 2. 3. 4.

Click on the ELLIPSE icon Specify the center of the ellipse Move the cursor in the direction of the first axis, type its value and press Enter Type the value of the second axis and press Enter

The Polar tracking For this experiment, we will make use of the POLAR TRACKING. Activating the following mode of the POLAR TRACKING will contribute to ease our task.

Creating the Ellipse Page 43 of 75

The ellipse is bent with an angle of 45 degrees. 1. 2. 3. 4. 5.

Activate the ELLIPSE command Specify the center of the Ellipse Track 45 degrees Type 70.5 and press ENTER Type 52 and press ENTER

You should have the following.

After creating the ellipse all you need to do is find the center line of the ellipse, OFFSET the ellipse and the line with an OFFSET value of 15.5. The resulting image should look similar to the following.

Page 44 of 75

Use the TRIM command to obtain the wanted object.

Creating the remaining piece To create the cross, you need to: Step 1 Create the following, you can find the length of the red line using the information given earlier.

Page 45 of 75

Step 2 Create a mirrored copy of the current object, the line of symmetry should be a line with and inclination angle of 45 degrees starting from the left end of the drawing.

Step 3 Create a vertical line that will serve as the new line of symmetry. The new line must have an end common with the center of the newly create circle.

Page 46 of 75

You don’t have to select the highlighted circle while you use the MIRROR command. After obtaining the figure we have just obtained, you can use the same trick to get the other part of the image. And that will be it. Combining both structures should not be an issue.

Learn AutoCAD basics: LESSON 12 Tutorial45 AutoCAD tips

All here is a déjà-vu. Last session, we’ve learned how to use the ELLIPSE command in AutoCAD, in this session we are coming back with an even easier ellipse. BUT, but now, the focus will be made on something totally different. in Learn-AutoCAD-LESSON -6, we have worked with the ARRAY command for the first time. Today you will need that command line more than EVER. And it is compulsory to have mastered it before trying the coming exercise.

Learning AutoCAD Basics NOTE: Element in the array are equally spaced around the ellipse. hey! If you have any confusion about this, Just leave a comment below. Let me know what is confusing about this, I will make it clear for you

Page 47 of 75

Figure 1

Figure 2 On the following image, the red line represents the PATH of the array. It resulted of an OFFSET of 5 units from the outer ellipse.

Page 48 of 75

More details about the star

Objects in the array The object in the array is nothing but the following

Page 49 of 75

You can find the dimension of the circles on the first image above.

Execution The only thing that might be hard to accomplish here is the array. There is nothing like ARRAYELLIPSE in AutoCAD, what you need to do to create this array is using the ARRAYPATH. To use the ARRAYPATH command using an ELLIPSE, you need to cut the ellipse into two and use the ARRAYPATH on each of the side, that is it. We would like to let you fight with it and figure it out yourself, using the information we provided above.