HSD MTR 1120-170 Spindle Repair & High-Torque Industrial Rebuild
Overview
The HSD MTR 1120-170 is a heavy-duty electrospindle engineered for sustained torque output in industrial CNC environments. It is designed for:
- Structural composite machining
- Hardwood processing
- Heavy aluminum cutting
- Large-format gantry systems
Unlike high-speed ES spindles, the MTR 1120-170 emphasizes torque stability over extreme RPM capability.
Official Technical Specifications HSD_Cat_Composite_mar24_Web_ENG…
- Body Diameter: 177 x 145 mm
- Max Speed: 18,000 rpm
- Torque S1/S6 (40%): 10.7 / 12.9 Nm
- Power S1/S6 (40%): 13.5 / 16.2 kW
- Rated Voltage: 380V
- Taper: ER32
- Cooling: Shaft-driven fan / Electric fan
- Weight: ~12.5 kg
What Makes This Model Different
- Lower maximum RPM (18k)
- Higher torque concentration
- Larger bearing stack
- Designed for sustained load rather than burst cutting
🔍 Common Failure Modes – MTR 1120-170
1️⃣ Load-Induced Bearing Fatigue
Sustained heavy cutting accelerates axial load fatigue.
Symptoms:
- vibration under deep cuts
- heat at nose during long cycle times
- gradual loss of rigidity
2️⃣ Thermal Drift
Air-cooled systems under sustained load can overheat if airflow is compromised.
3️⃣ ER32 Interface Wear
Collet wear causes:
- runout increase
- chatter
- poor surface finish
4️⃣ Fan System Degradation
Fan-driven cooling systems degrade over time.
Rebuild Process
- Full teardown
- Heavy-load bearing replacement
- Shaft inspection
- ER interface correction
- Fan replacement if needed
- Rotor balance verification
- Extended load test