Create Cam Gcode From STL In Freecad

Rev. JMoney

To generate a CAM program (G-code) from an STL file in FreeCAD, you’ll need to first convert the STL mesh into a solid model, then create a CAM job and define the machining parameters, and finally, generate the G-code.

Here’s a step-by-step guide:

1. Import and Convert STL to Solid:

  • Import: File > Import > Select your STL file.
  • Switch to Part Workbench: Go to the top menu and select Part Workbench.
  • Create Shape: Select the imported mesh and choose Part > Create Shape from Mesh.
  • Convert to Solid: Select the newly created shape and choose Part > Convert to Solid.

2. Prepare for CAM (Optional):

  • Refine (Optional): If you want to make the solid model cleaner or more accurate, you can refine it: Part > Refine Shape.
  • Create Body (Part Design Workbench): For easier editing, you can create a Body using Part Design > Create Body. This will also add a BaseFeature.

3. Switch to CAM Workbench and Define Job:

  • Switch to CAM Workbench: Go to the top menu and select CAM Workbench.
  • Create Job: Click on the “Job” button and select your solid model (the one you converted from the STL file).
  • Define Job Parameters: Set the material, tool, and other machining parameters according to your CNC machine and project requirements.

4. Define Operations:

  • Choose Operations: Select the operations you need for your project (e.g., pocketing, drilling, profiling).
  • Define Operation Parameters: Set the parameters for each operation (e.g., tool path, cut depth, speed).

5. Generate G-Code:

  • Generate G-Code: After defining all the operations, use the CAM tool to generate the G-code file.
  • Export G-Code: Export the G-code file to a format compatible with your CNC machine.

Important Considerations:

  • Accuracy: STL files are often not perfectly accurate representations of a solid model. Refining the solid model after conversion can improve machining accuracy.
  • CAM Software: FreeCAD’s CAM Workbench can generate G-code, but it might require a bit of learning to master the various operations and parameters.
  • Post-Processing: FreeCAD can generate G-code in its own dialect, which needs to be translated to the correct format for your CNC machine. This is done through post-processing.

This video demonstrates how to create a cam shape in FreeCAD: https://www.youtube.com/watch?v=F37wccyEubI