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Auto CAD Basics

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<span style="font-size: large;"><span style="font-family: 'Times New Roman', serif;"><b>                                                   Auto CAD  Basics</b></span></span></div>
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<span style="font-size: large;"><span style="font-family: 'Times New Roman', serif; text-indent: -0.25in;">1.<span style="font-family: 'Times New Roman';">     
</span></span><span style="font-family: 'Times New Roman', serif; text-indent: -0.25in;">One
Dimension</span></span></div>
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<span style="font-size: large;"><span style="font-family: "Times New Roman","serif";"><span style="font-family: 'Times New Roman', serif; text-indent: -0.25in;">2.<span style="font-family: 'Times New Roman';">     
</span></span><span style="font-family: 'Times New Roman', serif; text-indent: -0.25in;">Two
Dimension</span></span></span></div>
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<span style="font-size: large;"><span style="font-family: "Times New Roman","serif";"><b style="text-indent: -0.25in;">Principles of Projection</b></span></span></div>
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<span style="font-family: 'Times New Roman', serif; text-indent: -0.25in;">1.<span style="font-family: 'Times New Roman';">     
</span></span><span style="font-family: 'Times New Roman', serif; text-indent: -0.25in;">Orthographic
View</span></div>
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<span style="font-family: 'Times New Roman', serif; text-indent: -0.25in;">2.<span style="font-family: 'Times New Roman';">     
</span></span><span style="font-family: 'Times New Roman', serif; text-indent: -0.25in;">Isometric
View</span></div>
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<span style="font-family: 'Times New Roman', serif; text-indent: -0.25in;">3.<span style="font-family: 'Times New Roman';">     
</span></span><span style="font-family: 'Times New Roman', serif; text-indent: -0.25in;">Oblique
 View</span></div>
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<span style="font-family: 'Times New Roman', serif; text-indent: -0.25in;">4.<span style="font-family: 'Times New Roman';">     
</span></span><span style="font-family: 'Times New Roman', serif; text-indent: -0.25in;">Perspective
View</span></div>
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Orthographic View</span></b></span><br />
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<span style="font-family: Wingdings; font-size: large;">Ø<span style="font-family: 'Times New Roman';"> 
</span></span><span style="font-family: "Times New Roman","serif"; font-size: large;">First
Angle Projection</span></div>
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<span style="font-size: large;"><span style="font-family: "Times New Roman","serif";"><o:p></o:p></span><span style="font-family: Wingdings; mso-bidi-font-family: Wingdings; mso-fareast-font-family: Wingdings;">Ø<span style="font-family: 'Times New Roman';"> 
</span></span><span style="font-family: "Times New Roman","serif";">Third
Angle Projection<br /><o:p></o:p></span><u><span style="font-family: "Times New Roman","serif";"><br /></span></u></span></div>
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<span style="font-size: large;"><u><span style="font-family: "Times New Roman","serif";">First
Angle Projection</span></u><span style="font-family: "Times New Roman","serif";">In first
angle angle projection all views must be exchanged their place. For example If somebody
told you to draw a rough sketch of a  particular job which is which is said to view
in First angle projection. First Imagine its then draw a front view first, from
that imagine the bottom view draw at top, then right side view on the left and,
left on right at last draw top view at the bottom.</span><span style="font-family: "Times New Roman","serif";"> </span></span><br />
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<u><span style="font-family: "Times New Roman","serif";"><span style="font-size: large;">Third
Angle Projection<o:p></o:p></span></span></u></div>
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<span style="font-family: "Times New Roman","serif";"><span style="font-size: large;">In Third
angle projection draw as it is, Top view at the top, left view  at left, right view  at right and at the last bottom  view at bottom<o:p></o:p></span></span></div>
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<span style="font-family: "Times New Roman","serif";"><span style="font-size: large;">Show,
what you see. Or draw what  you see.<o:p></o:p></span></span></div>
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<span style="font-family: "Times New Roman","serif";"><span style="font-size: large;">Symbolic  View of First and Third Angle<o:p></o:p></span></span></div>
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<u><span style="font-family: "Times New Roman","serif";"><span style="font-size: large;">Isometric
View<o:p></o:p></span></span></u></div>
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<span style="font-family: "Times New Roman","serif";"><span style="font-size: large;">Draw an
isometric view refer with angle. Angle must be equal in both sides, if one side
it at 30 degree for other side too must have 30 degree then it is said to be
isometric view. <o:p></o:p></span></span></div>
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<u><span style="font-family: "Times New Roman","serif";"><span style="font-size: large;">Oblique
View <o:p></o:p></span></span></u></div>
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<span style="font-family: "Times New Roman","serif";"><span style="font-size: large;">If it
has one one side with the angle value, then it is said to be Oblique View<o:p></o:p></span></span></div>
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<u><span style="font-family: "Times New Roman","serif";"><span style="font-size: large;">Perspective
View<o:p></o:p></span></span></u></div>
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</span></span><span style="font-family: "Times New Roman","serif";">One
Point<o:p></o:p></span></span></div>
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</span></span><span style="font-family: "Times New Roman","serif";">Two
Point<o:p></o:p></span></span></div>
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</span></span><span style="font-family: "Times New Roman","serif";">Three
Point<o:p></o:p></span></span></div>
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<span style="font-family: "Times New Roman","serif";"><span style="font-size: large;">One
Point View<o:p></o:p></span></span></div>
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<span style="font-family: "Times New Roman","serif";"><span style="font-size: large;">The view
is seen or shown with one respective point<o:p></o:p></span></span></div>
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<span style="font-family: "Times New Roman","serif";"><span style="font-size: large;">Two
points View<o:p></o:p></span></span></div>
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<span style="font-family: "Times New Roman","serif";"><span style="font-size: large;">The view
is seen or shown with two respective points<o:p></o:p></span></span></div>
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<span style="font-family: "Times New Roman","serif";"><span style="font-size: large;">Three
Points View<o:p></o:p></span></span></div>
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<span style="font-family: "Times New Roman","serif";"><span style="font-size: large;">The view
is seen or shown with three respective points<o:p></o:p></span></span></div>
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<span style="font-family: "Times New Roman","serif";"><span style="font-size: large;"><u>Advantages
of Auto CAD software:</u><o:p></o:p></span></span></div>
<div class="MsoListParagraphCxSpFirst" style="mso-list: l3 level1 lfo5; text-indent: -.25in;">
<span style="font-size: large;"><span style="text-indent: -0.25in;"><span style="font-family: Wingdings;">  </span></span></span></div>
<div class="MsoListParagraphCxSpFirst" style="mso-list: l3 level1 lfo5; text-indent: -.25in;">
<span style="font-size: large;"><span style="font-family: 'Times New Roman', serif; text-indent: -0.25in;">        Time
Save</span></span></div>
<div class="MsoListParagraphCxSpMiddle" style="mso-list: l3 level1 lfo5; text-indent: -.25in;">
<span style="font-size: large;"><span style="font-family: Wingdings;">  </span><span style="font-family: "Times New Roman","serif";">Modification
can done later<o:p></o:p></span></span></div>
<div class="MsoListParagraphCxSpLast" style="mso-list: l3 level1 lfo5; text-indent: -.25in;">
<span style="font-size: large;"><span style="font-family: Wingdings;">  </span><span style="font-family: "Times New Roman","serif";">Team
work<o:p></o:p></span></span></div>
<div class="MsoNormal">
<span style="font-family: "Times New Roman","serif";"><span style="font-size: large;"><br /></span></span></div>
<div class="MsoNormal">
<span style="font-family: "Times New Roman","serif";"><span style="font-size: large;"><u>Applications:</u><o:p></o:p></span></span></div>
<div class="MsoNormal">
<span style="font-family: "Times New Roman","serif";"><span style="font-size: large;">    </span></span></div>
<div class="MsoNormal">
<span style="font-family: "Times New Roman","serif";"><span style="font-size: large;">    Mechanical,
Civil, Electrical, Medical <o:p></o:p></span></span></div>
<div class="MsoNormal">
<span style="font-family: "Times New Roman","serif";"><span style="font-size: large;"><br /></span></span></div>
<div class="MsoNormal">
<span style="font-family: "Times New Roman","serif";"><span style="font-size: large;"><u>Drafting:</u></span></span></div>
<div class="MsoNormal">
<span style="font-family: 'Times New Roman', serif; font-size: large; text-indent: -0.25in;">    </span></div>
<div class="MsoNormal">
<span style="font-family: 'Times New Roman', serif; font-size: large; text-indent: -0.25in;">    Part
Drafting</span></div>
<br />
<div class="MsoListParagraphCxSpLast" style="mso-list: l5 level1 lfo6; text-indent: -.25in;">
<span style="font-family: 'Times New Roman', serif; font-size: large; text-indent: -0.25in;">       Assembly Drafting</span></div>
</div>
</div>

Auto CAD Basics

Auto CAD Basics 1. One Dimension 2. Two Dimension Principles of ...

Modifying AutoCAD Drawing Objects

<div dir="ltr" style="text-align: left;" trbidi="on">
It’s been a while since I wrote the last AutoCAD tutorial. Let us 
continue the AutoCAD basic. The last tutorial discuss about how to draw 
in AutoCAD. Let us refresh our memory how we use the drawing tools. To 
draw in AutoCAD, we activate the tool, then <a href="http://cad-notes.com/2010/02/autocad-precise-input-specifying-point-coordinate/">define the coordinate</a>. You might need to <a href="http://cad-notes.com/2010/03/exercise-coordinate-input-drafting-tools/">use drafting tools to help you to define the precise position</a>.
 Modifying object is a bit different. Some tools also require you to 
input coordinate. But there is one more thing you should learn to modify
 object: selecting your objects.<br />

There will be time you need to modify your objects. It might because 
you make a mistake, or because sometimes it’s easier and faster you 
modify them later. Let us see the tools we can use to modify the 
objects.<br />

You can find the tools in <strong>AutoCAD ribbon, home tab>modify panel</strong>.
 There are many tools you will see here. Most of the tool name are 
self-explanatory. Like several previous posts, I will not describe each 
tool. You can always get the tool description by moving your pointer 
above the tool. Wait a little longer, then you will get more detailed 
description.<br />

What I want to emphasize here, is <strong>how we use AutoCAD modify tools</strong>.
 There are several possibilities of what you will see after activating a
 modify tool. Most basic modification tools will ask you to select 
objects to modify. And sometimes the tool will also ask you to define 
point coordinates. Some other tools will ask you several more options.<br />

Let us try several AutoCAD modify tool.<br />

<h3>
Copy/Move</h3>
Try to activate copy or move tool.<br />

<blockquote>
Command: _copy<br />
<span style="color: red;"><strong>Select objects: 1 found </strong></span><br />

<span style="color: red;"><strong>Select objects:<br />
</strong></span><span style="color: green;">Current settings:  Copy mode = Multiple<br />
</span><span style="color: blue;">Specify base point or [Displacement/mOde] <Displacement>: Specify second point<br />
or <use first point as displacement>: 700</span><br />

Specify second point or [Exit/Undo] <Exit>:</blockquote>
<ul>
<li>After you activate the copy tool, AutoCAD will ask you to select 
objects you want to modify. There are many ways that you can use to <strong><a href="http://cad-notes.com/2009/07/10-ways-to-use-autocad-object-selection/">select objects in AutoCAD drawing</a></strong>. The basic way to do it is by clicking each object you want to modify, or create a rectangular selection.</li>
<li>Next question is the tool option. Of course the option will be 
different for each tool. Try them or read the documentation for more 
details.</li>
<li>The last thing you need to do is defining the reference points to place the duplicate object.</li>
</ul>
All three question is the common steps you need to go through when you use modify tools.<br />

<h3>
Scale</h3>
Now let us try scale tool.<br />

<blockquote>
Command: _scale<br />
Select objects: Specify opposite corner: 1 found<br />

Select objects:<br />
Specify base point:<br />
Specify scale factor or [Copy/Reference]: 2</blockquote>
Scale tool will ask you to select object, define the base point, then the scale factor. Very similar steps with copy, right?<br />

<h3>
Array</h3>
Now array. Array is a little different. Not like most modify tool, it use dialog box.<br />

Rectangular array have several options, and select object button. But
 it doesn’t require you to define a point. However, polar array does 
need you to define the center point of array.<br />

<h3>
Summary</h3>
Basically you need to select objects, change some settings, and 
define points. Not necessarily all of them, but most of the modify tool 
do. We will do some exercise later. In the mean time, try the modify 
tools by yourself to get familiar with them.<br />

<h3>
Noun-verb vs Verb-noun selection</h3>
I’m not really sure about this, but I guess the default workflow to 
modify object in AutoCAD is using verb-noun selection. You activate the 
tool, then select the objects. However, you can also select your object 
first, then activate the tool. This is a default workflow in most 
Windows applications: noun-verb selection.</div>

Modifying AutoCAD Drawing Objects

It’s been a while since I wrote the last AutoCAD tutorial. Let us continue the AutoCAD basic. The last tutorial discuss about how to draw ...

Controlling UCS for Angled Drawing and Local Coordinates

<div dir="ltr" style="text-align: left;" trbidi="on">
If you already familiar with 3D modeling in AutoCAD, then you must be
 familiar with controlling coordinate system. The coordinate system you 
define will be a UCS (User Coordinate System). In 2D, there are many 
things that you can do by controlling coordinate system. In this 
article, we are going to discuss how to control it and why.<br />

<h2>
So Why Would We Need to Move/Rotate Our Coordinate?</h2>
<ol>
<li>Working on angled coordinate/object.<br />
UCS (user coordinate system) icon is showing you X axis and Y axis, an 
the origin. As you know, we input the point coordinate base on those 
axis. When we need to draw angled object in AutoCAD, in some cases it 
would be easier if we rotate the coordinate temporarily.</li>
<li>Working on local coordinate.<br />
Surveyor often need to work with local coordinate, but they may not mess
 up with the global coordinate. In AutoCAD, we can consider World 
Coordinate System (WCS) as global coordinate and User Coordinate System 
(UCS) as local coordinate.</li>
</ol>
*What a coincidence. When I’m thinking about this post, Autodesk release a video on YouTube: <a href="http://www.youtube.com/watch?v=ypV27ugOz3E" target="_blank">tip to work on angled portion of your drawing</a>.<br />

<h2>
How We Can Control the Coordinate System?</h2>
In the old days, we type UCS [enter] and choose the options. We still
 can do it now, but if you are not command line big fan, you may want to
 use the ribbon panel. Go to view tab, coordinates panel. All the 
options are here.<br />

The tools on first row, are used to move, save, or reset coordinate system to world coordinate system (WCS).<br />

On the second row, you can use the tools to rotate AutoCAD coordinate
 system using coordinate axis. Except the last one, the one with the 
light bulb is for turning UCS icon on or off.<br />

The last row, there are tools that you can use to quickly aligned the coordinate by view, object, or picking 3 points.<br />

Try to see AutoCAD extended tool tip to see more explanation.<br />

<h2>
Examples</h2>
<h3>
Aligned Objects</h3>
Let us see the building footprint below.<br />

Let’s say we need to draw the interior, parking lot and more objects 
to complete the AutoCAD drawing. It would be easier to rotate the 
coordinate system to complete the job. In this example, I use object and
 pick a line in the drawing.<br />

As you can see, the UCS icon is now moved and aligned to the top most line (I pick that line).<br />

Now when we create rectangle, linear dimensions, etc it will be 
aligned to the current UCS orientation. And don’t forget, ortho mode and
 polar tracking also using the XY axis! Try to create linear dimension 
and see how it works.<br />

<h4>
Rotating View</h4>
Still find it difficult? Many of us prefer to work with the object 
aligned to our screen. No problem. After you rotate the UCS, now you can
 set the <strong>viewpoint preset</strong>. Type VP then [enter], you should see the dialog below. Or using DDVPOINT command also works.<br />

Change the viewing angles option to <strong>relative to UCS</strong>. And change the from X Axis to 0.<br />

Click OK. You should see now the view rotated!<br />

Don’t you think this is much easier than working on rotated object? 
When you need to restore the view, open the view point presets dialog 
again, and choose <strong>absolute to WCS</strong>. Click OK. To restore coordinate system, click world coordinate on ribbon (the one with the earth globe)<br />

<h3>
Using Local Coordinates</h3>
Sometimes you need to draw or annotate relative to local coordinate 
and not to world coordinate. You surveyors should familiar with this. If
 you are in manufacturing industry, you probably need to annotate 
part/assembly coordinates, or holes coordinates. In Architecture 
drawing, you may need to annotate the elevation view.<br />

This example, shows a rough elevation view (yes it’s bad and lazy 
drawing, I know), but the elevation level is not showing correctly. The 
bottom red line should be at 0,00 elevation. It’s because ordinate 
dimension use 0,0 as origin. We need to move the origin before create 
the ordinate dimension.<br />

So after we restore the UCS to World coordinate, the dimension will 
use the world coordinate value? Nope. See below. The right dimensions 
was created in word coordinate. The left dimensions on local coordinate.
 The value never changed even we move the UCS around to new places.<br />

So how do you use UCS to increase drawing productivity? Is there any other tips you want to share with us?</div>

Controlling UCS for Angled Drawing and Local Coordinates

If you already familiar with 3D modeling in AutoCAD, then you must be familiar with controlling coordinate system. The coordinate system y...

Exercise: Coordinate Input and Drafting Tools

<div dir="ltr" style="text-align: left;" trbidi="on">
You have learned how to <a href="http://cad-notes.com/2010/02/autocad-precise-input-specifying-point-coordinate/">provide coordinate input in AutoCAD</a>, and using <a href="http://caddskills.blogspot.in/2013/11/autocad-precise-input-drafting-tools.html">AutoCAD drafting tools</a>.
 Let us do a little exercise before continue to the next topic. We are 
going to use some AutoCAD drawing tools and drafting tools.<br />

<h3>
Using the Metric Template</h3>
We are using metric template for this AutoCAD tutorial. If you 
haven’t set the default template to metric, create a new file from 
AutoCAD menu: new>drawing. Do not click the new file button on quick 
access toolbar! The button will use the default template and AutoCAD 
will not ask you which template you want to use. Select acadiso.dwt as 
template then click open.<br />

<h3>
Using Drawing Tools</h3>
You can access AutoCAD drawing tools on AutoCAD ribbon, home tab, draw panel.<br />

Activate rectangle.<br />

<h4>
To Input Coordinate</h4>
Click anywhere on your screen. The active field should be X field.<br />

<ul>
<li>Type 50 to define 50 units to the right (the X positive). Press 
comma. This will lock the X value and move the active field to Y field.</li>
<li>Type 150 then press enter. This will define the second point Y value 150 units up (Y positive).</li>
</ul>
<img alt="AutoCAD_dynamic_input" border="0" height="83" src="http://1-ps.googleusercontent.com/x/www.cad-notes.com/cad-notes.com/wp-content/uploads/2010/03/338x83xAutoCAD_dynamic_input.png.pagespeed.ic.qVYBurWc4I.png" style="border-width: 0px; display: inline;" title="AutoCAD_dynamic_input" width="338" /><br />

You just define a rectangle by defining X and Y value.<br />

<h4>
Using Object Snap Tracking</h4>
Activate rectangle again<br />

<blockquote>
Hint: You can press [enter] to reactivate last tool</blockquote>
Move your pointer above the right-bottom corner of the previous 
rectangle. Wait for a moment and move your pointer to the right. You 
will see dashed line and the dynamic input mentioning ‘extension: 
DISTANCE<ANGLE’. Move your pointer horizontally, sticky to the X 
axis. Type 700 then press [enter].<br />

Type 50,150 [enter] to define the next point.<br />

You’ve just created another rectangle by defining the distance from another object.<br />

<h4>
Using Object Snap</h4>
Activate rectangle again. This time snap the first point to the top right corner. Click to define the first point.<br />

Type 30,700 [enter] to define your rectangle.<br />

<h4>
Creating Arc</h4>
AutoCAD has many method to draw an arc, depends on what points do you have as references.<br />

This time click the 3-point method. Pay attention to what AutoCAD is asking you. Specify start point of arc or ↓<br />

The down arrow is showing that there are options related to this 
tool. Press down arrow. There is one option for this tool: Center. 
Select it.<br />

Now AutoCAD is asking for center point. Click point 1 as the center 
point. Point 2 as start point, and point 3 as the end point. If you draw
 arc using start-end point, then AutoCAD will draw it counter-clock 
wise.<br />

<blockquote>
Hint: You can use command line to change option. Type the
 capital letter to choose available option then [enter]. If there are 
more than 1 character in capital letter, type all of the capital 
letters.<br />

<strong>Specify next point or [<span style="color: red;">A</span>rc/<span style="color: red;">H</span>alfwidth/<span style="color: red;">L</span>ength/<span style="color: red;">U</span>ndo/<span style="color: red;">W</span>idth]:</strong></blockquote>
Nothing hard right? :) When you draw with AutoCAD drawing tools, you 
will only need to change options if necessary, then define the points. 
Look for some drawing samples and try to draw it. You may submit your 
inquiry here, probably I can help.<br />

Next, we will learn to use modify tools.</div>

Exercise: Coordinate Input and Drafting Tools

You have learned how to provide coordinate input in AutoCAD , and using AutoCAD drafting tools . Let us do a little exercise before contin...

AutoCAD Precise Input: Drafting Tools

<div dir="ltr" style="text-align: left;" trbidi="on">
You have learned how to precisely specify points by their 
coordinates. However, sometimes we need other methods to define points. 
There are some drafting tools that we can use to help us in specifying 
points.<br />

<h3>
AutoCAD Object Snap</h3>
Object snap is a tool that you can use to refer for a location from 
existing objects. For example, a center point of an arc or circle. You 
can snap to a reference point after you see the snap symbol on that 
point. Below is an example for midpoint snap.<br />

Object snap is only working when AutoCAD is asking you for a point. 
You will not see the object snap symbol when AutoCAD is not asking for 
point.<br />

<h4>
Object Snap Settings</h4>
There are many modes of object snap you can use. Activating all of 
the object snaps is not a wise decision. You will find difficulties 
snapping to objects when you have complex drawing. You need to decide 
which object snaps you commonly use. To activate or deactivate object 
snaps, you can right click on object snap button, and choose the object 
snap.<br />

You can also click settings… to open the settings dialog box. You can
 turn off the object snap (for all modes of snap) or you can 
check/uncheck a single snap mode.<br />

<blockquote>
Hint: You can press F3 to turn on/off object snap.</blockquote>
<h4>
Overriding Snap Mode</h4>
You have decided which object snaps you mostly use. However, you will
 need to use other snap mode eventually. And sometimes when the drawing 
become very crowded, you will wish only one snap mode is active. No need
 to change the object snap settings.<br />

You can simply hold [shift], right click your mouse. AutoCAD will 
show you snap override context menu. This will ignore your object snap 
settings temporarily, and use only the snap mode you choose. Remember, 
you can only use object snap when AutoCAD is asking you for a point!<br />

<h3>
Polar Tracking</h3>
When you draw an object, and your pointer is about parallel to 
AutoCAD axis, what will happen? It’s getting sticky and the angle show 
multiplication of 90 degrees. This is the polar tracking. It will track 
your pointer when at certain angle and snap your pointer. You can type 
the relative distance without typing the angle. This is very useful when
 you need to draw parallel lines. Simply move your pointer, snapped to 
the axis and type the desired distance.<br />

By default, it will track your pointer when it’s at 90 deg, 180 deg, 
270 deg, and 360 deg. We can change the incremental value by right 
clicking the polar tracking button, and choose incremental angle from 
the list.<br />

Try to take a look in settings dialog for more control.<br />

<h3>
Object Snap Tracking</h3>
Object snap tracking works with object snap. If you turn object snap 
off, then this tool will not work. This tool will help you to define a 
point from another point in an object.<br />

In this example, I want to define a circle center 400 units to the 
right of a rectangle corner. So I activate circle tool, place my pointer
 above the corner point. Wait for a while until AutoCAD recognize the 
point, and move your pointer to the right. The dynamic input should say 
‘extension:…’. Type the distance and press [enter].<br />

You can use more than one point as reference. In this example, I use object snap tracking to find a rectangle center.<br />

Or to find extended intersection from two lines.<br />

I guess now you have enough knowledge to start drawing with AutoCAD precisely. We will start an exercise on the next tutorial.</div>

AutoCAD Precise Input: Drafting Tools

You have learned how to precisely specify points by their coordinates. However, sometimes we need other methods to define points. There a...

AutoCAD Precise Input: Specifying Point Coordinate

You have learned how to use AutoCAD drawing tools. When you activate 
an AutoCAD drawing tool, there are two possibilities what AutoCAD will 
ask you: options or specifying points. Some AutoCAD tools ask your 
confirmation for settings before asking you for a point. You will need 
to define points eventually. In this tutorial, we will discuss how we 
can give precise input when AutoCAD asking us for a point location.<br />

<h3>
Drawing Object versus AutoCAD Scale</h3>
First, let us discuss how we should draw in your AutoCAD drawing, 
relevant to your scale. We draw our object in real size. If you have 5 
feet length object, then draw 5 feet length line. If you have 100 cm 
length object, then draw it 100 cm length. I have to emphasize this 
because I found some people don’t work this way. They have 100 cm length
 object, and because they plan to plot it to 1:100 scale, they draw it 1
 cm length. It’s a no-no.<br />

We always draw the objects in their real size in CAD… any CAD 
applications. We only use scale for plotting purpose. We are drawing in a
 limitless area. Well, I know this is not true. But most CAD application
 can handle your design size.<br />

AutoCAD only has 2 units by default: inch (imperial) and mm (metric) 
for plotting. So we better use that two units to avoid confusion when we
 plot (later about this). So if you work in metric, and you want to draw
 1 m length line, draw it 1000 mm.<br />

So AutoCAD only recognize mm and inch? No. Only for plot purpose. We 
can use other units like feet, cm, or m, but I recommend you to use inch
 or mm for the first time.<br />

<h3>
‘Classic’ versus Dynamic Input</h3>
Since AutoCAD 2006 (correct me if I’m wrong) Autodesk introduce 
‘dynamic input’ to AutoCAD users. If you’ve just installed AutoCAD, then
 this feature by default is on. If you or someone turn it off, try to 
turn it on. Give it a try first. Later, if you don’t like it, you may 
turn it off. Click the dynamic input button in drafting settings group.<br />

The method in defining coordinate using dynamic input or ‘classic’ input is a bit different. However they have the same concept.<br />

<h3>
Relative Coordinate</h3>
Activate line tool. We will try this basic tool to comprehend how we can talk with AutoCAD about point coordinate.<br />

AutoCAD will ask you for first point. Since we don’t have anything in
 our drawing yet, just click anywhere to define a start point.<br />

<h4>
Polar Coordinate</h4>
After you place the first point, AutoCAD will show you dynamic input 
like image below. By default the dynamic input will ask for polar 
coordinate input.<br />

Drawing description<br />

<ol>
<li>The line length</li>
<li>The line angle, relative to positive X axis</li>
<li>The tool option</li>
</ol>
<img alt="AutoCAD_polar_input" border="0" height="111" src="http://cad-notes.com/wp-content/uploads/2010/02/AutoCAD_polar_input.png" style="border-width: 0px; display: inline;" title="AutoCAD_polar_input" width="275" /><br />

You can simply type the line length, press tab to move to angle field, type the angle value and press [enter].<br />

When you use more complex AutoCAD tool, you probably need to change 
the tool options. You can press down arrow to see available options. For
 AutoCAD line tool, there is only ‘undo’ option. This will cancel the 
last line segment.<br />

The value shown by dynamic input is relative coordinate. It means it 
shows the distance between your pointer and previous point. So if you 
want to draw a horizontal 100 length line: after you click the first 
point, type 100 for length, press [tab] to move to angle field type 0 
then [enter]. It will create a line with 100 unit length, and parallel 
to positive X axis.<br />

What will happen if you type 100 for length, and 180 for angle? Try it!<br />

<blockquote>
Hint: You can also define the length and angle by typing distance<angle. For example 100<30.</blockquote>
<h4>
Cartesian Coordinate</h4>
The other common coordinate we use is Cartesian coordinate, by 
defining X and Y value. We can do this by typing X,Y when dynamic input 
is asking for next point. After we press comma, then the dynamic input 
will show you X and Y value like this.<br />

25,50 means 25 units to the right, then 50 units to the top.<br />

If you type positive value, then the next point will be to X/Y 
positive axis. But if you type negative value, it will be to negative 
axis FROM your last point. Try it!<br />

<h3>
Global Coordinate</h3>
If you work in land surveying industry, then you will need what we 
call global coordinate. You may want to precisely draw points or objects
 from a benchmark point. The intersection point of AutoCAD X and Y axis 
is the 0,0 coordinate.<br />

Remember: by default positive X axis is to the right, and positive Y to the top.<br />

We can input global coordinate by add prefix hash tag # before typing
 the XY value. If you add the # prefix, then AutoCAD will ignore the 
previous point, and measure your point from AutoCAD global 0,0 
coordinate. Give it a try!<br />

<h4>
Using AutoCAD ‘Classic’ Input</h4>
All the above input mode is if you have the dynamic input turned on. 
If you turn it off, then inputting coordinate is slightly different. You
 will probably see many veteran AutoCAD users still using this way. The 
main reason people don’t like using dynamic input is because they feel 
it’s disturbing their view.<br />

If you turn dynamic input off then:<br />

<ol>
<li>When you type X,Y value, you are defining global coordinate.</li>
<li>To define relative coordinate you need to add prefix @ before typing X, Y. It will be @X,Y.</li>
<li>It also applies to polar coordinate. You have to type @distance<angle for relative coordinate.</li>
</ol>
It is up to you which one you will use. However, I recommend you to 
use dynamic input because it is the common way to define coordinate in 
other CAD applications.<br />

We will have some exercise next.</div>

AutoCAD Precise Input: Specifying Point Coordinate

You have learned how to use AutoCAD drawing tools. When you activate an AutoCAD drawing tool, there are two possibilities what AutoCAD w...

Using Template and Setting Your Unit

<div dir="ltr" style="text-align: left;" trbidi="on">
There’s not much in this tutorial. However, I consider this is very important part for the rest of the tutorial. <br />

I found most AutoCAD users never aware about using template. And 
worse, sometimes they just open existing drawing, erase the drawings, 
and use the existing styles and objects. Avoid this, since this will 
make your files corrupted.<br />

What is a template? Template is a starting point of your work. There 
are some default settings you, your company use. Each industry may have 
different template, even the drawing come from the same company.<br />

How can use template? When you choose file>new, AutoCAD will ask 
you to choose your template. When you first time starting AutoCAD, it 
will use the default imperial template. If you work in metric, create 
another file and close the first one.<br />

<h3>
AutoCAD Drawing Unit</h3>
When you draw with AutoCAD, AutoCAD doesn’t recognize what unit you 
are using. It just know you are drawing a 5 unit length line. However, 
this is useful to set the unit when you work further. Especially when 
you work with someone else, with different unit.<br />

You can check and change your unit by accessing application <strong>menu>drawing utilities>units</strong>.<br />

If you use metric as template, it’s already use millimeters. Imperial
 using inch. Keep in mind that AutoCAD use mm and inch only as default 
unit in plotting. So if you don’t want to have headache figuring what 
scale to use, stick to mm or inch. You can use other units, but you need
 to adjust the scale value when plotting.<br />

<h3>
AutoCAD 2010 Initial Setup</h3>
There is a new feature in AutoCAD 2010 that we can use to easily 
manage our template: initial setup. You probably have set it when the 
first time running AutoCAD 2010. But if you are not sure, let us define 
our initial setup.<br />

Click the option button in your ribbon>view tab>windows panel.<br />

This will open options dialog box. Switch to user preferences tab, and click the initial setup.<br />

On the first page, select your industry. Click next.<br />

On the second page, select which tools you want to add to your ribbon.<br />

On third page, you can specify your default template. This is the one
 AutoCAD will open every time you star AutoCAD. If you already have your
 template, you can select it. But as we just started here, let us just 
new default drawing. But use metric/imperial.<br />

<h3>
Using Template</h3>
And how we can create our own template? You can find the <a href="http://cad-notes.com/2009/09/preparing-your-autocad-template/">detailed tutorial here</a>.
 You can bookmark it to learn it later. We haven’t touch many area in 
the tutorial yet. However, I need to emphasize that you have to consider
 your template (which will affect drawing units) from very early stage. </div>

Using Template and Setting Your Unit

There’s not much in this tutorial. However, I consider this is very important part for the rest of the tutorial. I found most AutoCAD use...