Stone cNC engraving machine
BCTC BHLRB 7A3D | Seven Axis Robotic Stone Carving System
BCTC BHLRB 7A3D is a 7 axis robotic stone cnc engraving machine designed around KUKA industrial robots specifically for stone manufacturers of 3D sculpture, deep relief, architectural decoration, monuments, and other complex stone products.
BHLRB 7A3D is equipped with a 15 kW electric spindle with a maximum speed of 18500 revolutions per minute. This machine supports rough machining, detailed carving, drilling, and surface finishing of workpieces without the need to replace another machine. For stone companies transitioning from manual carving to digital production, BHLRB 7A3D provides a practical way to convert 3D models into repeatable machining processes.
Traditional CNC engraving machines can handle flat or relatively simple stones. But when it comes to sculptures, column tops, embedded architectural decorations, or deep relief monuments, it becomes relatively difficult.
Using BHLRB 7A3D, the robot has six axes for positioning and a seventh linear axis for moving along the workpiece. This enables cutting tools to follow complex surfaces while maintaining appropriate approach angles. This way, the actual processing range is larger, and there are fewer situations where operators manually reposition the stone.
The system is therefore particularly suited to work that requires:
- 3D stone carving
- Deep relief sculpture
- Composite surface
- Bottom cutting and recessed details
- Architectural stone decoration
- Monuments and commemorative carvings
- Customized decorative stone
Advantage
Prepare and verify the machining process before cutting.
BHLRB 7A3D stone cnc engraving machine uses integrated CAD/CAM/OLP software for offline programming. 3D models can be imported into software for processing strategy selection, tool path generation, virtual simulation, collision detection, and post-processing of robot controllers
The typical workflow is:
The typical workflow is:
3D model
1
>>
Tool path
2
>>
Virtual simulation
3
>>
Collision check
4
>>
Robot program
5
>>
Machining
6
One Spindle, Multiple Machining Tasks
The spindle is designed for more than simple engraving.
The spindle power is 15 kilowatts and has position and orientation control functions, which can be adjusted according to the material, tool, and processing stage. Low speed operation can be used to remove heavier materials, while high-speed operation is suitable for fine machining and surface finishing.
The supported tooling includes:
- Diamond blades for cutting and grooving
- Carbide and diamond-tipped routers for 3D carving and relief work
- Core drills and finger bits for holes and internal cavities
- Resin-bond polishing pads for surface finishing
How Seven Axes Changes the Equation?
There are 7 motion axes, among which J1~J6 are rotary joints, and J7 is the linear axis of the ground track (infinite stroke). Add two key capability dimensions compared to the 3/4/5 axis system:
- Redundant degrees of freedom allow the tool to reach any spatial orientation of the workpiece, including the bottom, back, and concave areas;
- In tool path planning, the inclination angle of the tool can be independently controlled to ensure that the cutting angle and normal deviation at each point on the surface are controlled within ± 2 °;
- The entire process is completed within a single clamping cycle, and the accumulated clamping error is reset to zero.
Technical Specifications
| Parameter | Specification |
| Model | BHLRB 7A3D |
| Robot Arm | KUKA Industrial Robot |
| Offline Programming | CAD/CAM/OLP |
| Spindle Power | 15 kw |
| Maximum spindle speed | 18500 RPM |
| Table Payload | 8000 kg |
| Table Rotation | Continuous rotation |
| Maximum Processing Size | 1200 × 2300 mm |
| Repeatability | <+0.06mm |
| Processable Materials | Granite, marble, quartz, quartzite, engineered stone, sintered stone, artificial stone, foam |
| Certification | CE, ISO 9001 |
FAQ
What is the maximum workpiece size the machine can process?
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The practical maximum processing envelope is 1,200 mm × 2,300 mm per setup.
What is a Stone CNC Engraving Machine used for?
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A Stone Engraving Machine is used for engraving, carving, relief work, 3D sculpture, architectural ornamentation, monument processing, and other customized stone applications.
Can BHLRB 7A3D process granite and marble?
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Yes. The 15 kW spindle allow the machine to process materials ranging from marble and limestone to harder granite and engineered stone.
What is the difference between a 7 axis robot stone carving machine and a 5 axis CNC machine?
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A 5 axis machine tool consists of three linear axes and two rotating axes. The tool posture is limited by the stroke, and there are blind spots such as bottom cutting and deep cavity machining. Complex workpieces often require multiple clamping. BHLRB 7A3D adopts a 6-joint arm and a 7th ground rail linear axis, with redundant degrees of freedom allowing the tool to reach any spatial orientation. It can complete the entire process from rough machining to polishing in a single clamping, and is suitable for large sculptures.
Start your robot stone carving journey
HLRB 7A3D is not a machine you impulsively purchase, but a strategic investment to reshape the factory's product portfolio, production capacity, and competitive positioning.
BCTC provides free pre order support for the following:
Technical consultation to evaluate whether BHLRB 7A3D is suitable for your product portfolio and production volume
Sample carving demonstration, provide us with a 3D model of your typical product, and we will process a physical sample for you to evaluate
Facility planning guidelines, such as floor area requirements, utility specifications, and environmental considerations
Virtual or face to face factory visit to BCTC robot stone processing demonstration center
Contact BCTC immediately to arrange consultation. Our robot application engineers will work with you to map the functionality of BHLRB 7A3D to your specific product requirements and help you build a business case for this transformative investment.
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