Emulate 3D Surface Machining – FreeCAD CAM Tip 11 (3D Surface Toolpath Hack)

Download link for the Face to ZDepthCorrection macro: https://ko-fi.com/s/96e64a2bfa Learn how to emulate a 3D surface operation in FreeCAD CAM using a standard Pocket operation to avoid unwanted internal cuts and then moving the toolpath to follow the curve of the surface (and a free Macro). This method is perfect for CNC users looking to mill complex surfaces while keeping full control over toolpaths. In this FreeCAD CAM Tip, you'll discover how to: Set up a Pocket operation to mimic 3D surfacing Move and align the toolpath to match a curved surface Prevent cutting into unwanted internal areas Optimize G-code for a cleaner, safer machining process This technique is ideal for CNC machinists using FreeCAD who want more flexibility in surface milling without creating complex full 3D operations. If you enjoyed learning how to emulate 3D surface machining in FreeCAD, take it further with my new project. In this step-by-step tutorial, we apply real 3D surface machining to engrave a logo directly onto a curved part, combining Part modeling, 3D surface operations, and a FreeCAD macro for accurate engraving toolpaths. A great follow-up to see these surface machining concepts used in a complete, real-world project! — Curved Engraving in FreeCAD 1.1 | Full CAD-CAM Machining Workflow:    • 3D Curved Engraving in FreeCAD 1.1 | Full ...   Watch more FreeCAD CAM tips here:    • FreeCAD CAM Tips – Smarter Toolpaths & G-C...   Want to see this 3D surface trick in action on a full FreeCAD CNC project? Watch “CNC CAM G Code – making a 3D project for CNC to celebrate 1000 subscribers” — it’s a complete workflow from modeling to milling, using this same macro-based method for curved toolpaths:    • 3D CNC Tutorial | Curved Intarsia & Inlay ...   0:00 Introduction – How to Emulate 3D Surface Milling in FreeCAD 1:01 Milling Surface Options: 3D Surface Operation & 3D Pocket (and why they fail) 1:38 Generate a Projection of the 3D Surface for Toolpath Control 1:59 Create a Machining Face from the Surface Projection 2:47 Set Up a New CNC Job Using a Pocket Hack 3:50 Generate a Pocket Toolpath for Surface Emulation 4:53 Adjust the Toolpath to Follow Curved Surfaces (Free Macro Available) 6:00 Troubleshooting Toolpath Errors and Fixing Common Issues 6:26 Why This Pocket Hack Improves 3D Surface Machining 7:11 Limitations of the Hack and How to Overcome Them 9:50 Final Recap – Download the Free Macro from Patreon If you want to support me, please subscribe to my Patreon or buy a one time support through the following links: My Patreon page:   / opensourcecnc   Big Thanks ($10):   / one-time-big-thanks-244233   Thanks ($3):   / one-time-thank-you-244228   The Macro required to make this work:   / freecad-add-face-101314830   You can book a one on one session with me, to sort things out if you need help with certain projects or situations:   / one-hour-one-on-138672386   #FreeCAD #CNC #CAM #GCode #CNCmachining #3Dsurface #SurfacingTrick