How to Add Spline on AutoCAD?

Step-by-Step Guide to Adding a Spline in AutoCAD

Adding a spline in AutoCAD involves several steps that allow users to create smooth, flowing curves based on fit points or control vertices. Follow these detailed instructions to learn how to add a spline to your drawing in AutoCAD 2025.

Starting a New Drawing

1. Open AutoCAD: Launch the application.
2. Create a New Drawing: Click on the "New Drawing" option or select it from the File menu.

Accessing the Spline Tool

1. Locate the Draw Panel: Navigate to the "Home" tab.
2. Select Spline: Click on the "Spline" icon from the Draw panel. Alternatively, you can type "SPL" in the command line and press Enter.

Specifying Points for the Spline

1. Choose the Start Point: Click on the drawing area to set the beginning of your spline, or enter specific coordinates in the command line.
2. Add Additional Points: Continue to place more points by clicking in the drawing area or by entering their coordinates. The spline will curve through these points.
3. Finalize the Spline: When you have added all necessary points, press Enter to complete the spline. If you wish to close the spline into a loop, type "C" and then press Enter.

Editing a Spline

1. Access the Edit Spline Tool: Go to the "Home" ribbon. Expand the "Modify" panel and click on "Edit Spline."
2. Select Your Spline: Click on the spline to edit it. AutoCAD provides options for modification, such as adding or removing control points.

Changing a Polyline to a Spline

1. Use the PEDIT Command: Type "PEDIT" in the command line to convert a polyline into a spline.
2. Select the Polyline: Click on the polyline you wish to convert. Follow the prompts to complete the conversion.

Making a Spline Thicker

1. Convert to Polyline: To set a thickness, first convert the spline to a polyline using the PEDIT command.
2. Set the Width: Once converted, adjust the global width to increase the line’s thickness as desired.

Understanding Splines and Their Use

Splines are mathematical curves that create smooth transitions through specified points. In the context of AutoCAD, they allow for more organic shapes compared to standard straight lines composed of polylines. The primary distinction is that splines offer more flexibility and smoother curves, suitable for complex design requirements.

Frequently Asked Questions

What is the difference between a spline and a polyline in AutoCAD?
Splines are smooth curves defined by a series of control points, while polylines are composed of straight line segments. Splines provide more fluidity and are often used for more natural shapes.

How can I explode a spline in AutoCAD?
To separate a spline from other combined objects, type "EXPLODE" or "X" in the command line, select the spline, and press Enter. This will break the spline into individual components.

Can I create a 3D spline in AutoCAD?
Yes, you can create a 3D spline in AutoCAD by using the appropriate 3D commands. Access the "3D Spline" tool from the Draw panel and follow similar steps as in creating a 2D spline, adjusting for Z-coordinates as needed.