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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!
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