BT40 120MM Milling Spindle for High-Torque Vertical Milling Machines
The BT40 120mm Milling Spindle is a heavy-duty mechanical core engineered for industrial Vertical Milling Machines (VMC) that demand a balance of high rotational speed and extreme clamping rigidity. Featuring a standard BT-40 nose taper, this spindle ensures seamless integration with a wide range of industrial tooling for efficient material removal. The unit is designed with a precision-ground 120H6 locating diameter and a 165mm flange, providing a stable, high-accuracy mounting profile within the machine headstock. To handle the high-load demands of industrial milling, it features a specialized 4+2 bearing configuration, utilizing high-precision 7012 P4 bearings at the front and 7010 P4 bearings at the rear. With an 8000 RPM peak performance and low-maintenance grease-packed lubrication, this 410mm spindle assembly delivers the mechanical stability and rotational accuracy required for superior surface finishes in professional machining environments.
- Industrial BT40 Nose Taper for high rotational accuracy and torque
- High-Speed 8000 RPM capability for diverse machining tasks
- Robust 4+2 Bearing Configuration for maximum load stability
- Precision P4 Grade Bearing Assembly (7012 & 7010)
- Maintenance-free Grease-Packed lubrication system
- High-Rigidity 120H6 Locating Diameter with 165mm flange
- Compatible with modern industrial CNC systems and VMC architectures
Comparative Technical Spindle Motor Configurations Matrix
Use the structural data catalog matrix below to evaluate power outputs, maximum RPM, operating voltages, and cooling styles across standard TriQuench CNC spindle models.
| Spindle Capacity | Operating Speed | Operating Voltage | Cooling System |
|---|---|---|---|
| 12.0 kW | 18,000 RPM | 380 V | Water-Cooled |
| 0.8 kW | 24,000 RPM | 220 V | Air-Cooled (Long Shaft) |
| 3.7 kW | 40,000 RPM | 380 V | Water-Cooled ISO20 |
| 9.0 kW | 18,000 RPM | 380 V | Air-Cooled |
Technical Specifications
| Technical Parameter | Engineering Specification Value |
|---|---|
| MODEL NUMBER | MTMSBT40120 |
| NOSE TAPER | BT-40 |
| MAX SPEED | 8000 RPM |
| LOCATING DIAMETER | 120H6 |
| TOTAL LENGTH | 410 mm |
| FLANGE DIAMETER | 165 mm |
| LUBRICATION TYPE | Grease Packed |
| BEARING SETUP | 4 Front + 2 Rear |
| BEARING TYPES | front: 7012 P4 | rear: 7010 P4 |
| MECHANICAL | bodyType: Belt Driven Milling Spindle | precisionGrade: Industrial High Precision | applicationCompatibility: Vertical Milling Machine (VMC) |
Industrial Applications
| Usage Scenario | Target Industry |
|---|---|
| Industrial Vertical Milling Machines (VMC) | Heavy Engineering and Tooling |
| Medium-to-Heavy Duty Metal Milling and Drilling | Automotive Component Manufacturing |
| Die and Mold Component Fabrication | Aerospace Fabrication |
| Automotive and Aerospace Machining Centers | Industrial Machine Tool OEM |
| Precision Component Manufacturing | Precision Fabrication Studios |
| High-Stability Spindle Retrofitting and OEM Integration | General Engineering |
Technical FAQ & Operational Guide
What are the benefits of the 4+2 bearing configuration?
The 4+2 setup uses four high-precision bearings at the front to handle the primary radial and axial cutting forces, while two rear bearings provide rotational stability. This configuration significantly enhances the spindle's rigidity, allowing for heavier cuts and better surface finishes during industrial milling.
Does this spindle require daily lubrication?
No. This spindle is grease-packed, which means it is factory-lubricated for its operational lifespan under normal conditions. This reduces maintenance downtime and ensures consistent performance without the need for an external oil mist system.
Why is the 120H6 locating diameter important?
The 120H6 specification refers to a high-precision tolerance for the spindle body diameter. This ensures a perfect, concentrated fit into the machine headstock, which is vital for maintaining micron-level rotational accuracy and absorbing high-torque vibration.
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