Internal Grinding Spindle
80MD120Y1.5
Ultra-high-speed internal and micro grinding spindle with P2 ceramic hybrid bearings (Si3N4). 120,000 r/min, 1.5 kW, runout 0.0005mm for micro-bore and miniature component grinding.
80MD120Y1.5 Internal/Micro Grinding Spindle
The 80MD120Y1.5 is an ultra-high-speed internal and micro grinding spindle engineered for the most demanding precision grinding applications involving very small bores, miniature components, and micro-features. Operating at an extraordinary 120,000 r/min with 1.5 kW of power from an ultra-high-frequency motor, this spindle achieves the wheel surface speeds required for effective grinding with micro-diameter mounted points and grinding quills up to 6mm.
P2-grade ceramic hybrid angular contact ball bearings with silicon nitride (Si3N4) balls -- the highest precision bearing class available -- ensure exceptional rotational accuracy with runout of just 0.5 micron at the spindle nose. The ceramic hybrid construction provides superior thermal stability, reduced friction, and extended bearing life at extreme speeds compared to all-steel bearings. A dedicated oil-air cooling circuit manages the thermal environment within the compact 80mm housing. Weighing only 8 kg, the 80MD120Y1.5 integrates into high-precision jig grinding machines, coordinate grinding machines, CNC internal grinding machines, and specialized micro-machining centers. It is the definitive solution for grinding fuel injector nozzle bores, watch-making components, micro-bearing races, spinneret holes, and other applications where form accuracy is measured in fractions of a micron. Operating at ≤62 dB(A) with G0.2 balancing grade, this spindle sets the standard for ultra-precision micro-grinding.
Download Drawing Get a QuoteDetailed Parameters
| Speed (r/min) | 120000 |
| Power (kW) | 1.5 |
| Torque (Nm) | 0.12 |
| Motor Type | Ultra-High-Frequency Asynchronous Motor |
| Bearing Type | P2 Ceramic Hybrid Angular Contact Ball Bearings (Si₃N₄ balls) |
| Bearing Arrangement | Tandem (DT) with calibrated spring preload |
| Runout Accuracy | ≤ 0.0005mm (0.5 micron) at spindle nose |
| Cooling Method | Oil-air cooling (bearings + motor jacket) |
| Lubrication | Oil-air micro-lubrication (high-precision metering) |
| Housing Diameter | 80mm |
| Housing Material | Alloy Steel (42CrMo4) |
| Spindle Weight | ~8 kg |
| Max Grinding Quill | 6mm |
| Collet Interface | Precision collet system (1mm - 8mm shank range) |
| Noise Level | ≤ 62 dB(A) at max speed |
| Balancing Grade | G0.2 per ISO 1940-1 |
| Protection Class | IP54 |
| Sensor Integration | Built-in temperature sensor (PT100) + vibration monitoring |
| Mounting Orientation | Horizontal |
| Operating Environment | Climate-controlled (20 ± 2°C recommended) |
| Application | Internal bore grinding / micro grinding / miniature components |
Available Options & Customizations
- P2 hybrid ceramic bearings with special clearance class
- High-pressure oil-air lubrication system
- Custom grinding quill diameters (3mm, 4mm, 5mm, 6mm)
- Built-in acoustic emission sensor for gap control
- Spindle frequency converter package
- Increased IP65 protection for wet grinding
Ultra-Precision for Micro-Grinding
The 80MD120Y1.5 features P2 ceramic hybrid bearings and 120,000 rpm capability for the most demanding micro-grinding applications.
120,000 rpm Maximum Speed
Extreme rotational speeds for micro-diameter grinding wheels and mounted points.
P2 Ceramic Hybrid Bearings (Si₃N₄)
Highest precision bearing class with silicon nitride balls delivers exceptional 0.5 micron runout accuracy.
Ultra-High-Frequency Motor
Specialized motor design for smooth, vibration-free operation at 120,000 rpm.
Oil-Air Cooling System
Comprehensive thermal management for ultra-high-speed continuous operation.
80mm Compact Housing
Minimal diameter for access to very small bores and confined spaces.
0.5 Micron Runout
Class-leading rotational accuracy for the most demanding micro-grinding applications.
Lightweight 8 kg Design
Minimal mass for precision machine axis movements and fine positioning.
≤62 dB(A) Ultra-Quiet Operation
Exceptionally low noise levels ideal for laboratory and precision workshop environments.
Request a Quote for 80MD120Y1.5
Tell us your micro-grinding requirements and machine specifications. Our engineering team will provide a detailed proposal with pricing, lead time, and integration support. 24-hour response guaranteed.