How to Use Spline in AutoCAD 2016

Understanding the Spline Tool in AutoCAD 2025

Introduction to Spline in AutoCAD

The spline tool in AutoCAD is essential for creating smooth, curved shapes that connect through designated points. It offers flexibility in drawing non-linear curves, making it vital for various design needs, such as architectural plans and mechanical drawings.

Activating the Spline Command

1. Initiate the Command: Begin by typing SPLINE into the command line and hit Enter. This action activates the spline command.
2. Defining Points: Click on your drawing area to define points the spline should pass through. Each click adds a vertex to your spline.
3. Finalizing the Spline: After positioning all desired points, press Enter to complete the spline creation.

Editing and Modifying Splines

Editing a spline may be necessary to refine its shape or to add points.

To Edit an Existing Spline:

1. Select the Spline: Click on the spline you wish to edit.
2. Access the Edit Tool: Navigate to the Home ribbon and expand the Modify panel. Choose the ‘Edit Spline’ tool from the options presented.
3. Adjust Vertices: Use the options provided to adjust control vertices or fit points to modify the shape as needed.

Converting Between Splines and Polylines

AutoCAD allows users to convert splines into polylines, which can then be manipulated further.

Converting a Spline to a Polyline:

1. Open SPLINEDIT Command: Type SPLINEDIT and press Enter.
2. Select the Spline: Click on the spline you want to convert.
3. Convert to Polyline: Enter ‘P’ in the command line and press Enter.
4. Specify Precision: Provide a precision value between 0 and 99 when prompted, indicating how closely the polyline will match the spline.

Adding Points to a Spline

New points can be essential for refining splines.

To Add a Point to a Spline:

1. Using Object Snap: For creating a new point, activate Osnap and utilize the ‘near’ option to position the point accurately.
2. Editing to Add Control Points: For adding a control point to an existing spline, use the SPLINEDIT command again, select the spline, then choose ‘Fit’ and opt for ‘Add’ to insert the new point.

Thickening a Spline

If a thicker spline is required, converting it to a polyline is necessary, which allows for width customization.

1. Use PEDIT Command: Type PEDIT into the command line and choose the converted polyline.
2. Set Width: When prompted, specify the width you want for the polyline, thereby thickening the spline.

Utilizing Object Snaps (Osnaps)

Osnaps are crucial in AutoCAD for ensuring precision. They help snap the cursor to specific points on objects, aiding in accurate drawing and editing.

Exploding a Spline

A spline can only be exploded once converted to a polyline.

1. Convert the Spline: Follow the conversion steps mentioned earlier.
2. Use Explode Command: Type EXPLODE in the command line after converting. This allows modifications to individual segments of the former spline.

Simplifying Polylines with Many Vertices

1. Select the Polyline: Click on the polyline you want to simplify.
2. Drafting Aids: From the Modify menu, select ‘Drafting Aids’ and then ‘Simplify Polys.’
3. Set Parameters: Specify any parameters for simplification and click OK.

Converting 2D Polylines to 3D

1. Access the Convert Panel: Navigate to the Modify tab and find the Design panel.
2. Select Polylines: Highlight the polyline(s) to be converted and press Enter.

FAQs

What types of designs benefit from using splines in AutoCAD?
Splines are particularly useful in architectural designs, product shapes, and industrial drawings, where smooth curves enhance visual appeal and structural integrity.

Can I create a spline that is not constrained by defined points?
Yes, you can create a spline using control vertices, allowing for greater flexibility in designing organic shapes without the restriction of predefined points.

Are there any limitations to using splines in AutoCAD?
While splines provide flexibility, they’re more complex than polylines and can be more challenging to manipulate. Additionally, converting splines to polylines may lead to a loss of some smoothness in curves.