The Arc Tool: Free AutoCAD Tutorial

Topics Covered in This AutoCAD Tutorial:

The Arc Tool

Exercise Preview

Exercise Overview

In this comprehensive exercise, you'll master the Arc command by completing a practical drawing of a trash bin container and adding door swings. This real-world application demonstrates how arcs are essential for creating accurate architectural and mechanical drawings, skills that remain crucial for CAD professionals in 2026's design landscape.

Using the Arc Tool

1. Begin by opening the file Arc-Bin Container.dwg. This exercise file contains the foundation elements you'll need to practice arc creation techniques.

2. You'll now utilize the Arc command to complete the floor of the bin container. The Arc tool offers multiple methods for creation, and while you can follow Command Line prompts for basic options, the Ribbon interface provides access to advanced options that aren't available through command-line input alone. This flexibility makes the Ribbon approach particularly valuable for precision work. Navigate to the Draw panel in the Ribbon and click the Arc dropdown menu to access these enhanced options.

   

3. Select Start, End, Radius from the dropdown menu. This method requires you to specify a start point, an end point, and then define the radius value. Understanding AutoCAD's directional conventions is critical here: by default, angles and arcs are measured and created in a counter-clockwise direction. This means your start and end points must be positioned so the arc flows counter-clockwise from the starting location. Zoom in on the right door hinge for precision, then click on the center intersection of the hinge for your start point, as shown in the diagram below. For the end point, select the corresponding hinge intersection on the opposite side. When prompted for the radius, enter 60 units.

   

4. With the container floor complete, you'll now create the door swings using a different arc method. First, change your current layer to Doors to maintain proper drawing organization—a best practice that becomes increasingly important in complex projects. From the Arc dropdown menu, select Start, Center, End. Remember that counter-clockwise creation rule: click and snap to the upper-left corner of the right door for your Start Point, as indicated in the diagram below. For the Center point, click the hinge intersection where you began the previous arc. Finally, select the midpoint of the floor arc you created in the previous step as your End Point.

   

5. Continue building your door swing by selecting Start, Center, End from the Arc dropdown once again. Note an important workflow detail: because you're using a specific Arc tool option rather than the default command, you cannot simply press Enter to repeat the previous operation—doing so will revert to the tool's default settings. Maintaining your counter-clockwise approach, select the midpoint where you concluded the previous door swing as your new Start point. For the Center, choose the hinge intersection on the opposite side. Complete the arc by selecting the upper-right corner endpoint of the right door as your End point, following the diagram below. Don't be concerned if the endpoints of your door swing arcs appear slightly misaligned—this is normal and will be corrected in the next step.

   

6. The Arc tool generates arcs as segments of perfect circles, which means endpoints may not always align precisely with your intended locations. This mathematical precision is actually a strength of the tool, but it requires fine-tuning for practical applications. Fortunately, AutoCAD's Grips system provides an elegant solution for these minor adjustments. Select each arc individually and use the grip points (small squares) to make precise corrections. This grip-editing capability exemplifies why AutoCAD remains the industry standard for technical drawing—it combines mathematical accuracy with practical flexibility.

   Right door swing (use red square grip to correct it):

   

   Left door swing (use red square grip to correct it):

   

7. Save and close the file to preserve your work. You've now successfully demonstrated multiple arc creation methods and learned essential grip-editing techniques that will serve you throughout your AutoCAD career.