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27. Tutorials in AutoCAD (examples step by step) - 3D Draw 1

For example, I will show step by step "how to line up a 3D object shown in the picture below.
This view of the 3D model of the SE Isometric

Drawing 3D model in AutoCAD - stepby step

First on the drawing refer to dimensions and appearance of the 3D body. We can see that this 3D object can draw in two
ways. We can draw from the beginning of the 3D body (box - square) but it can draw in the first 2D drawings and using Extrude and Union etc etc. I'll start immediately with a 3D body and will use the Extrude command and
Subtract subtract basic 3D body parts.

But before we start drawing a study that looks at us all game for a better understanding of the 3D model and when we
take away certain parts of the base that we follow the steps.

So we have the following views

View 3D model in AutoCAD

Of course, these views may be different but it all depends on how you started to draw. This view of the 3D model (pictured above) SE Isometric.  This is the view of the 3D model (image below) SW Isometric



STEP 1

So we draw a 3D model of the outer dimensions 90x60x50 in the SE Isometric view. UCS us in its original position WORLD


Now let's go with a command from the toolbar BOX MODELING draw a 3D model of rectangular

Command: _box
Specify first corner or [Center]: [click on the desktop left mouse]
Specify other corner or [Cube / Length]: L [we determine that we draw a 3D model using enrollment size]
Specify length <80.0000>: 50 [length of the 3D model]
Specify width <75.0000>: 90 [Beam 3D model]
Specify height or [2Point] <40.0000>: 60 [height of the 3D model]
Command: ESC


Now we have drawn a basic 3D model


STEP 2

If you look at a 3D model of the finished shape you can see that the two ways we can add a model that will be deducted from the base. We can work through the top and looked over the FRONT view. I went through the FRONT view. So with
regard to the dimensions quoted I drew two rectangles (Recetangle command) at the ends of the model which will later be cut Extrude and Subtract command.

Command: _rectang
Specify first corner point or [chamfer / Elevation / Fillet / Thickness / Width]:
Specify other corner point or [Area / Dimensions / Rotation]: D
Specify length for rectangles <10.0000>: 15
Specify width for rectangles <10.0000>: 60


Now I have this situation.


STEP 3

The next step is to create a 3D model of our rectangle which will extrude. Make sure you are not tampering with the
position of the UCS. So click on a command button on the toolbar EXTRUDE MODELING and then select the rectangle and pressing ENTER, type the value -30.

Why value MINUS?

MINUS because if you look at the position of UCS then we find that our Z axis in the opposite direction from that in which we extrude our rectangle. And if we remember our coordinate system, if we go below the plane which consists of X and Z axis (or Y and Z axis), then our value is in the minus (see coordinate system). Do not you just confuses the 2D coordinate system. In 3D we have a Z axis and it is always taken in combination with the X axis or Y axis, so again we have a plane. (XZ or YZ).

Why the value of 30? So look a little elevation on the drawing. If the total width of the 3D model 90 have a
part that is listed the value of 60 then a simple calculation (90-60 = 30)

3D Coordinate sistem in AutoCAD

STEP 4

The next step is to subtract subtract red model from the basic yellow. So click on the Subtract command to subtract the underlying model. If you do not know that then you have not read this web tutorial from the beginning. See
Subtract command.
Now we have this situation.


STEP 5
The next step is to subtract the base of the 3D model on the other side. Of course, the same action again but this time the view is RIGHT in it again draw rectangles measuring 40x20 (90-50 = 40 and 20 have the elevation drawing)

Command: _rectang
Specify first corner point or [chamfer / Elevation / Fillet / Thickness / Width]:
Specify other corner point or [Area / Dimensions / Rotation]: D
Specify length for rectangles <90.0000>: 40
Specify width for rectangles <60.0000>: 20


It looks like as shown below. Here you see that I am drawing rectangles directly to SE Isometric view (for another example)


STEP 6

The next step is to create a 3D model of our rectangle which will extrude. Make sure you are not tampering with the
position of the UCS. So click on a command button on the toolbar EXTRUDE MODELING and then select the rectangle and pressing ENTER, type the value -50.


STEP 7

The next step is to subtract subtract red model from the basic yellow. So click on the Subtract command to subtract the underlying model. If you do not know that then you have not read this web tutorial from the beginning. See Subtract command.        

Now we have a final look of our 3D model

Example drawing 3D model in AutoCAD step by step