Donut and Helix in AutoCAD

Donut

The donut is defined as a solid-filled circle or filled ring object.

It consists of polyline connected end to end in a circular shape. We are required to specify the inside and outside diameter that determine the width of the donut.

The donut with specified input and output diameter will look like the below image:

If we want to create a solid filled circle, we need to specify the inside diameter of 0, which will look like the below image:

The donut with specified input and output diameter will look like the below image:

The donut command in AutoCAD is used to create a donut-shaped object, which can be used in different ways in a drawing, like the wheel of four-wheelers, design circuits, etc.

Consider the below image:

The above image displays how donut can be used.

Let's understand by an example.

The steps are listed below:

1. Select Donut icon under the Draw interface, as shown below:
   
   Or
   Type Do or donut on the command line or command prompt and press Enter.
2. Specify the inside diameter of the donut. For example, 3.
3. Specify the outside diameter of the donut. For example, 5.
4. Specify the center point of the donut on the viewport.
5. Press Esc or Enter to exit.

The created donut is shown below:

Helix

The helix is defined as the 2D or 3D spiral structure. It is also used to create threads, circular stairways, and springs.

We are required to specify a center point, radius, and base of the helix in 2D.

In 3D, we are required to specify a center point, radius, base point, and height of helix.

Consider the below image:

It signifies the points required to create a helix.

Let's understand with an example.

The steps are listed below:

1. Select the Helix icon under the Draw interface, as shown below:
   
   Or
   Type helix on the command line or command prompt and press Enter.
2. Specify center point of the base on the viewport or drawing area of AutoCAD.
3. Specify the base radius or diameter of the helix. For example, 4.
   It is shown below:
   
   For diameter, press D and enter the value of diameter.
4. Specify the top radius or diameter. For example, 0.5.
5. It is shown below:
   
6. For diameter, press D and enter the value of diameter.
7. Press Enter or Esc to exit.
   The helix will look like the below image:
   
8. To create a helix in Isometric or 3D, specify the helix height. We can also determine the turn or twist accordingly.