Fusion360 to FreeCAD for CNC and CAD / CAM to LinuxCNC with the Path workbench

Introduction

This tutorial guides you through the process of transitioning from Fusion360 to FreeCAD for CNC and CAD/CAM applications, specifically focusing on using the Path workbench to mill a brass electrode. This change is beneficial for users looking for open-source alternatives that provide robust design and machining capabilities.

Step 1: Understanding the Differences Between Fusion360 and FreeCAD

• User Interface: FreeCAD has a more complex interface compared to Fusion360, which may require some time to get accustomed to.
• Features: FreeCAD is highly customizable and supports different workbenches for various tasks such as modeling, assembly, and CAM.
• Community and Support: Fusion360 has extensive official documentation and support, while FreeCAD relies on community forums and user-generated content for troubleshooting.

Practical Tip: Take time to explore FreeCAD’s interface and user settings to tailor it to your workflow.

Step 2: Setting Up FreeCAD for CNC

• Install FreeCAD: Download and install the latest version of FreeCAD from the official website.
• Add Path Workbench:
  • Go to the Addon Manager (found in the Tools menu).
  • Search for and enable the Path workbench for CNC operations.

Common Pitfall: Ensure that all dependencies are installed. Check for any missing components that could affect functionality.

Step 3: Designing the Brass Electrode

• Create a New Project: Open FreeCAD and start a new project.
• Select the Part Workbench: This is where you will design the electrode.
• Draw the Electrode Profile:
  • Use the sketching tools to outline the shape of the brass electrode.
  • Define dimensions accurately to ensure the design meets specifications.

Practical Tip: Save your work frequently to prevent data loss.

Step 4: Preparing the Design for Milling

• Switch to the Path Workbench: After completing the design, switch to the Path workbench.

• Create a Job:

  • Click on the 'Path Job' button to create a new milling job.
  • Select the tool and workpiece setup.

• Define Tool Paths:

  • Choose the appropriate milling operations (e.g., Pocket, Profile).
  • Adjust settings like feed rate and cutting depth according to the material and tooling.

Common Pitfall: Double-check the tool paths to prevent collisions with the workpiece.

Step 5: Exporting G-Code for LinuxCNC

• Generate G-Code:

  • Once the tool paths are established, use the 'Post Process' feature.
  • Select the LinuxCNC post-processor to generate compatible G-Code.

• Save the G-Code File: Choose a destination and save the file for use with your CNC machine.

Practical Tip: Always review the G-Code using a simulator to ensure it behaves as expected before running it on the CNC machine.

Conclusion

Transitioning from Fusion360 to FreeCAD can enhance your CNC machining capabilities with a flexible, open-source tool. By following the steps outlined, you can design and prepare a brass electrode for milling. Remember to familiarize yourself with FreeCAD’s interface, utilize community resources for support, and always verify your designs and G-Code before machining. For further exploration, consider diving deeper into FreeCAD’s advanced features or experimenting with different materials and designs in your CNC projects.