CNC Milling Spindle
120XDJ24G12
Compact high-speed synchronous motor spindle with BT40 interface. 12 kW output, 24,000 r/min maximum speed, and sub-micron runout accuracy for light milling, engraving, and small CNC machining centers.
120XDJ24G12 CNC Milling Spindle
The 120XDJ24G12 is a compact high-speed synchronous motor spindle engineered for light milling, precision engraving, and small CNC machining centers. With a slim 120mm housing diameter, 12 kW of continuous power, and a maximum speed of 24,000 r/min, this spindle excels in high-speed material removal of aluminum, plastics, and non-ferrous alloys.
The G-type synchronous permanent magnet motor delivers constant torque across a broad speed range, ensuring consistent surface finishes even under varying cutting loads. Equipped with P4 precision angular contact ball bearings in a tandem-O arrangement and a water-cooling jacket, the 120XDJ24G12 maintains thermal stability and runout accuracy within 1 micron. The standard BT40 tool interface provides broad compatibility with readily available toolholders, while the integrated motor-spindle architecture eliminates belts and gears for near-zero transmission loss. This spindle is ideal for high-speed light milling, engraving, mold texturing, and small-part precision machining.
Download Drawing Get a QuoteDetailed Parameters
| Speed (r/min) | 24000 |
| Power (kW) | 12 |
| Torque (Nm) | 4.8 |
| Voltage (V) | 380 |
| Current (A) | 26 |
| Motor Type | Synchronous Permanent Magnet Motor (G-type) |
| Tool Interface | BT40 (DIN 69871) / HSK E40 optional |
| Bearing Type | P4 Precision Angular Contact Ball Bearings |
| Bearing Arrangement | Tandem-O (TO) |
| Bearing Lubrication | Grease |
| Runout Accuracy | ≤ 0.001mm at spindle nose |
| Cooling Method | Water-jacket cooling with external chiller (min 6 L/min flow) |
| Housing Diameter | 120mm |
| Housing Length | ~420mm |
| Spindle Weight | ~45 kg |
| Tool Clamping | Hydraulic drawbar |
| Drawbar Force | 10 kN |
| Sensor Integration | 2x PT100 temperature sensors |
| Protection Class | IP54 |
| Noise Level | ≤ 70 dB(A) at max speed |
| Balancing Grade | G0.4 per ISO 1940-1 |
| Mounting Orientation | Vertical / Horizontal |
Available Options & Customizations
- HSK E40 tool interface for high-speed toolholding
- Ceramic hybrid bearings (Si₃N₄ balls) for extended high-speed life
- Oil-air micro-lubrication for continuous high-speed operation
- Rotary encoder for rigid tapping and spindle orientation
- Built-in vibration sensor for condition monitoring
- Custom voltage and frequency per regional requirements
Engineered for High-Speed Light Milling
The 120XDJ24G12 combines compact dimensions with synchronous motor precision for exceptional performance in small machining centers.
Synchronous Motor (G-type)
Permanent magnet synchronous motor maintains constant speed under varying loads for consistent surface finish.
P4 Precision Bearings
High-precision angular contact bearings in TO arrangement for superior rigidity at 24,000 rpm.
24,000 rpm Capability
High maximum speed enables fast feed rates and superior surface quality in aluminum and non-ferrous alloys.
Integrated Motor-Spindle
Rotor mounted directly on spindle shaft eliminates belts and gears for zero transmission loss.
Efficient Water Cooling
Spiral water jacket with optimized flow channels maintains stable temperature during extended high-speed runs.
Precision-Balanced Rotor
Dynamically balanced to G0.4 grade for ultra-low vibration across the full 24,000 rpm speed range.
Compact 120mm Housing
Slim 120mm outer diameter enables easy integration into small machine tools and engraving machines.
Universal BT40 Interface
Standard BT40 tool interface ensures wide compatibility with readily available toolholders and accessories.
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Applications: High-speed light milling · Precision engraving and mold texturing · Small CNC machining centers · Aluminum and non-ferrous alloy machining · Small-part precision manufacturing · PCB and electronics housing machining