Spiral Stairs in AutoCAD 3D | AutoCAD| CIVIL 3D

Creating spiral stairs in AutoCAD Civil 3D involves drawing the 2D path, creating the 3D structure, and then assembling the components to form a complete spiral staircase. Here’s a step-by-step guide to help you design and model spiral stairs in AutoCAD Civil 3D:

Step 1: Set Up Your Workspace

1. **Switch to 3D Modeling Workspace**:
  - Open AutoCAD Civil 3D.
  - Click on the gear icon in the bottom-right corner of the window to open the workspace selector.
  - Select "3D Modeling" from the list.

2. **Activate the 3D Tools**:
  - Ensure that the "3D Tools" tab is visible on the ribbon. If not, right-click on the ribbon and select "Show Tabs"  "3D Tools".

Step 2: Draw the 2D Path of the Spiral Stairs

1. **Draw the Centerline**:
  - Use the "Circle" tool to draw a circle representing the center of the spiral staircase.

  ```plaintext
  - Home  Draw  Circle
  ```

2. **Draw the Spiral Path**:
  - Use the "Helix" tool to draw the spiral path of the stairs.
  - Specify the base radius, top radius (usually the same as the base for a uniform spiral), and the height of the helix.

  ```plaintext
  - Home  Draw Helix
  - Specify base radius, top radius, and height
  ```

Step 3: Create the 3D Treads

1. **Draw a Tread Profile**:
  -

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