AutoCAD 12 and higher versions

In this article I will make an introduction to EXTRUDE command and we will learn how to use it.

Modeling toolbox is a new feature in AutoCAD 2007. However, most of the tools that it includes already exist in previous versions of AutoCAD. EXTRUDE command is one of the most popular methods that is used for converting 2 dimensional entities into 3 dimensional solid entities.

Now let’s examine the command.

Enter “EXTRUDE” into the command line or select the button with circular shaped symbol as shown in the modeling toolbar in Fig. 2. AutoCAD will prompt you to select the entity that will be extruded.

Select objects to extrude:

Fig.3

After selecting the entity, AutoCAD prompts you to select any one of the EXTRUDE methods.

Specify height of extrusion or [Direction/ Path/ Taper angle] <36.2829>:

Let’s start by making EXTRUDE by using the first method. We can either enter a value along Z axis or we can select height dynamically by a mouse click.

Fig.4 EXTRUDE that was made by entering only height.

This time, let’s make EXTRUDE by using “Taper” option.

This time, we will apply EXTRUDE command to a circle.

Let’s execute the command and select the entity.

Select objects to extrude:

Fig.5

Select Taper angle option.
Specify height of extrusion or [Direction /Path /Taper angle] <0>: T
Enter angle value.
Specify angle of taper for extrusion <0>:15

Now, enter height value that will be given.

Specify height of extrusion or [Direction/Path/Taper angle] <0>:100

After completion of parameters, model will look like as shown in Fig. 6.

Fig.6

Now, let’s take a look at the model from side view and see how the angle and height values that we entered are being used.

Fig.7

And now, let’s make EXTRUDE by using Path method.

Specify height of extrusion or [Direction/ Path/ Taper angle] <0>: P

Fig.8

You can select a polyline as path. You can create a polyline by entering pline from command line. After completion of command and applying the command accordingly you will obtain the solid model as shown in Fig. 9.

Fig.9

Direction

This option is similar to Path option, however you have to select the coordinates of the points for which EXTRUDE operation will be made. Let me explain by giving and example.

Execute the EXTRUD command and select Direction option.
Select objects to extrude: ‘Select entity’
Specify height of extrusion or [Direction/Path/Taper angle] <0>: D
Starting and end points of the path is entered.
Specify start point of direction: 0,0,0
Specify end point of direction: 0,10,40

Fig.10

In order to understand the concept better, let’s run the “Dist” command and select points 1 and 2.

Command: di
DIST Specify first point: Specify second point:
Delta X = 0.0000, Delta Y = 10.0000, Delta Z = 40.0000

If you examine changes in x, y, z axis pairs as shown above, then you will understand what does 0,0,0-0,10,40 values that we gave for path means better.

Have a nice day…

“Always tell the truth and you never have to remember what you said.” – T.L. Osborn.

Related articles: See “3D Modeling” chapter in AutoCAD Lessons.

Technorati Tags: AutoCAD, Solid Modeling, 3D, EXTRUDE

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Last read: 28 August 2008, 5:20

3D, 3D Modeling, AutoCAD 2007