FreeCAD CAM Guide 2026

FreeCAD CAM Tutorial 2026: Generate CNC Toolpaths & G-Code

Learn how to use FreeCAD CAM to create CNC toolpaths from 3D models. Explore machining operations, tool selection, simulation, G-code export, and common mistakes.

Want to turn a 3D CAD model into a real mechanical component using a CNC machine? With FreeCAD, you can move beyond 3D modeling and explore computer-aided manufacturing (CAM) without purchasing expensive commercial CAD/CAM software.

FreeCAD includes a CAM Workbench that helps you create machining operations, generate toolpaths, simulate cutting processes, and export machine instructions in G-code format. Older tutorials and documentation may refer to this workbench as the Path Workbench. The exact interface and available operations depend on your installed FreeCAD version.

In this tutorial, you'll learn how to prepare a 3D model, configure a CAM job, generate CNC toolpaths, simulate machining, and export G-code for a compatible CNC machine.

01 What Is CAM in FreeCAD?

CAM stands for Computer-Aided Manufacturing. It connects a digital CAD model with the machining instructions required to manufacture a physical part.

The FreeCAD CAM Workbench allows you to define the raw material, select cutting tools, configure machining operations, and generate toolpaths for supported manufacturing workflows.

The typical workflow is:

1. Create or import a 3D CAD model.

2. Prepare the model for machining.

3. Create a CAM job.

4. Define stock material & setup.

5. Select tools & operations.

6. Generate and simulate paths.

7. Post-process the job for machine-compatible G-code.

FreeCAD's CAM workflow uses a machine-independent toolpath representation before a postprocessor translates it into instructions for a particular CNC controller.

02 What You Need Before Starting

•FreeCAD: A version with the CAM Workbench available.
•3D CAD model: A valid mechanical component created in FreeCAD or imported from a compatible CAD format.
•Stock material: The raw block or material from which the part will be machined.
•Cutting tools: Appropriate end mills, drills, or other tools for your intended operations.
•Machine information: Your CNC machine's work envelope, coordinate system, and supported controller format.
•Postprocessor: A suitable postprocessor for your CNC controller.

For this tutorial, imagine machining a simple rectangular aluminum plate with a central pocket and four mounting holes. This example demonstrates several common 2.5D milling operations.

1 Step 1: Create or Import Your 3D Model

Begin by opening FreeCAD and creating a new document. You can model your component using the Part Design or Part workbench, or import an existing model if its geometry is suitable for CAM operations.

For this example, create a rectangular plate with:

A flat top surface.
A central rectangular pocket.
Four mounting holes.
Clearly defined outer edges.

You can create the model using a sketch, Pad, Pocket, and Hole operations. Before proceeding, check the model for invalid or overlapping geometry. A clean, valid solid makes it easier to select machining features and generate reliable toolpaths.

Pro tip: Keep a separate copy of your original CAD model before preparing the CAM job. This helps you return to the original design if you need to revise machining features or stock settings.

2 Step 2: Open the CAM Workbench

Switch to the CAM Workbench using the workbench selector in FreeCAD. Depending on your version, the interface may display CAM-related commands, operations, tool libraries, simulation options, and post-processing tools. Review the available tools before beginning the job.

Common machining operations include:

Face: Removes material from a surface to create a flatter top face.

Profile or Contour: Machines an internal or external boundary.

Pocket: Removes material from recessed regions.

Drilling: Creates holes using appropriate drilling cycles.

Adaptive: Material removal using adaptive clearing where supported.

Engrave: Creates engraving paths for suitable geometry and tools.

3 Step 3: Create a CAM Job

Select the appropriate Job command in the CAM Workbench. The CAM job organizes information required to generate the machining program, including model, stock, tools, operations, and postprocessor configuration.

Configure the stock material

Stock represents the raw material that will be machined into your final component. For example, if your finished component measures 100 × 60 × 10 mm, raw stock could be 104 × 64 × 12 mm. Incorrect stock dimensions or alignment can cause toolpaths to start in unexpected locations.

Set the machining origin

Define the work coordinate origin according to your intended CNC setup (commonly the top surface near one corner). Your coordinate system, stock placement, work offset, and machine setup must agree.

4 Step 4: Select Cutting Tools and Configure Parameters

Choose the tools needed for your operations. For a simple plate, you might use an end mill for facing, pocketing, and contouring, along with a suitable drill or milling strategy for mounting holes.

Tool diameter and geometry

Spindle speed & Feed rate

Cutting depth, step-down, and step-over

Tool number and tool-change settings

Do not copy arbitrary feed rates or spindle speeds from another project. Use verified cutting data appropriate for your setup, material, and machine rigidity.

5 Step 5: Generate the CNC Toolpaths

With stock and tools configured, add machining operations in the intended order (Facing, Pocket Milling, Drilling, and External Contouring). Recalculate paths and verify geometry selection.

6 Step 6: Simulate the Machining Process

Never assume a generated toolpath is safe simply because FreeCAD created it successfully. Use simulation tools to check for unexpected cuts, rapid collision risks, and correct depths.

Important: CAM simulation is a verification aid, not a guarantee of safe machining. Review the final setup, tooling, and fixtures before running the program.

7 Step 7: Export G-Code Using the Correct Postprocessor

Post-processing converts FreeCAD's internal toolpath representation into G-code appropriate for a particular CNC controller. Verify units, coordinate conventions, work offsets, and safety moves before saving the output.

Common FreeCAD CAM Problems & Solutions

Problem	Possible Cause	What to Check
Toolpath does not generate	Invalid geometry or unsuitable operation settings	Check geometry, feature selection, and parameters
Toolpath in wrong position	Incorrect stock alignment or origin	Review job placement and coordinate system
Pocket is not fully machined	Incorrect depth, boundary selection, or tool access	Check pocket geometry, depth, and tool diameter
Wrong machining units	Inconsistent unit or postprocessor settings	Verify input values and generated G-code units
Tool collision risk	Poor clearances, incorrect heights, missing fixtures	Inspect rapid moves, retract heights, and setup
G-code rejected by machine	Incompatible postprocessor or unsupported commands	Check controller dialect and post configuration

FreeCAD CAM vs. Traditional CAD Modeling

CAD Modeling

Defines the component's geometry
Uses sketches and 3D features
Produces a digital design model
Focuses on design intent and dimensions

CAM Programming

Defines how the component will be machined
Uses tools, stock, and machining operations
Produces toolpaths and machine instructions
Focuses on material removal & manufacturing setup

Best Practices for CNC Toolpath Generation

1. Validate your CAD model: Check geometry before creating CAM job.

2. Use realistic stock dimensions: Include sufficient material allowance.

3. Confirm tool specs: Verify geometry, feeds, speeds, and depths.

4. Plan machining sequence: Consider workholding and tool access.

5. Inspect every operation: Review paths individually.

6. Verify postprocessor: Match output to actual machine and controller.

7. Check generated G-code: Review code before running.

8. Controlled first run: Follow safety procedures and dry-run tests.

Is FreeCAD CAM Worth Learning in 2026?

FreeCAD CAM is worth exploring if you want to connect mechanical design with CNC manufacturing using an open-source CAD environment. It provides a useful learning path for students, hobbyists, makers, and engineers.

Start with a simple component, learn how each machining operation works, and gradually move toward more complex parts.

Frequently Asked Questions

1. Can FreeCAD generate CNC G-code?

Yes. FreeCAD's CAM Workbench can generate toolpaths and export machine instructions through an appropriate postprocessor. The resulting G-code must match the target CNC controller.

2. Is FreeCAD CAM free?

FreeCAD is open-source software available without a commercial software license fee. You should still account for any costs associated with machine tools, hardware, tooling, and manufacturing equipment.

3. Can I use FreeCAD CAM for CNC milling?

Yes. The CAM Workbench includes milling operations such as facing, pocketing, profiling, and drilling, although specific capabilities depend on the installed version and operation support.

4. What is a postprocessor in FreeCAD?

A postprocessor converts FreeCAD's internal toolpath representation into a G-code dialect compatible with a particular CNC controller.

5. Should I simulate toolpaths before exporting G-code?

Yes. Simulation and code inspection help identify potential programming problems. However, they do not replace machine-specific verification, workholding checks, or safe operating procedures.

6. Can FreeCAD CAM replace commercial CAM software?

It may suit some hobby, educational, and manufacturing workflows. Whether it can replace a commercial CAM package depends on your machining requirements, required strategies, controller support, and production needs.

FreeCAD CAM in 2026: Generate CNC Toolpaths from a 3D Model

FreeCAD CAM Tutorial 2026: Generate CNC Toolpaths & G-Code

01 What Is CAM in FreeCAD?

02 What You Need Before Starting

1 Step 1: Create or Import Your 3D Model