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Beside milling metal, the machining of stone makes the highest demands in the CNC manufacturing. When it comes to deep machining of granite, marble and slate, it turns out if the machine construction is stable enough in all axes to avoid the bending of the components during the machining process. An unstable built CNC router cannot process the milling paths precisely and produces inaccurate results. You can visualise this by imagining a machine which is supposed to mill a straight line into stone, but due to the bending of the Z-axis, the milling cutter shifts left and right which makes it impossible for the machine to create a straight line.
Trying to engrave fonts as a 3D relief in solid stone, many homemade CNC routers fail because of low-quality components or non-professional mounting. How to design a stable machine with steel components and a high-frequency spindle which is sturdy enough to mill stone accurately in the low-price segment? Asking this question is crucial before buying a CNC machine. A standard milling motor is sufficient for machining wood, brass or plastic. But milling solid stone like granite you need the performance of a high-frequency spindle for getting good results. In the following pictures you the quality of stone engravings made by the RaptorX milling machine and an HF-spindle:
Fonts engraved with V-Carving

Sunken and raised writing in marble

3D stone engraving in marble

Before purchasing a machine, you should know that milling marble or granite requires a much more robust CNC router and a high-frequency spindle than milling Softwood or plastic.
Of course, you need to spend more money on such a machine due to the high-quality component used for building the machine.
The following tips will help you to buy an appropriate CNC router for machining stone:
You should better expect to spend more money. Usually, cheap CNC routers cannot mill resistant stone in the deep.



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Jacob from United States
I am a beginner at CNC, I’ve never used a CNC machine before and with in a day I was carving. An awesome machine for a beginner to learn as hobbyists. I used the manual and the help video. One hour to assemble and test, very friendly and easy to use. It’s a good buy for the money. I would definitely recommend this machine to someone getting into CNCs.
Weinstein from France
I've been using CNC plasma SYP2060-300A and I am very impressed with this unit.
This unit is of higher quality, made in China. Five stars all the way!
Stone Bridge Saw from 🇪🇸 Carlos García — Spain
Good choice for kitchen countertop fabrication. We can cut granite and marble accurately, including sink openings and straight cuts.Thank you Aillen
4 Axis Stone CNC Machine from 🇮🇹 Marco Rossi — Italy
We purchased this SYS1225-4Axis machine for stone columns and curved surfaces. The 4-axis function gives us much more flexibility.
Stone CNC Router from 🇫🇷 Pierre Martin — France
SYS2030 Very suitable for marble engraving and relief carving. The machine produces detailed patterns and the water cooling system works well.
Fiber Laser Marking Machine from 🇩🇪 Thomas Schneider — Germany
We use the SYJF-50W fiber laser for stainless steel and aluminum marking. The marking is precise and the software is convenient for daily production.
ATC CNC Router from 🇨🇦 Robert Miller — Canada
The SYM1325 ATC system works smoothly and makes production much faster. We use it for wood furniture and custom signage with very good results.
CNC Wood Router from 🇦🇺 James Carter — Australia
SYM1530 ATC Very good router for cabinet doors and furniture panels. The automatic tool changer saves a lot of working time during production.
🇬🇧 Daniel Wilson — UK CO2 Laser Cutting Machine from
SYJ1390-300W We mainly cut acrylic and MDF. The cutting edges are clean, and the machine is easy to operate. Very satisfied with SENYO’s support
SYS1530-2 Excellent machine for granite and marble engraving. from 🇺🇸 Michael Johnson — USA
The 4-axis function makes 3D carving much easier, and the machine frame feels very solida.