HSD AT 90 Spindle Repair & Automatic Tool Change Rebuild
Overview
The HSD AT 90 is a compact automatic tool change spindle designed for CNC routers and light machining centers requiring high tool-change cycle reliability.
Unlike manual MT spindles, the AT 90 includes:
- Integrated drawbar system
- Pneumatic clamp release
- Tool presence detection compatibility
Official Technical Specifications HSD_Cat_Composite_mar24_Web_ENG…
- Body Diameter: 90 mm
- Max Speed: 24,000 rpm
- Motor Technology: Asynchronous
- Taper Options: ISO30 / HSK variants (depending on configuration)
- Cooling: Fan or liquid (depending on version)
Common AT 90 Failure Modes
1️⃣ Clamp Force Loss
Belleville washer fatigue reduces retention force.
Symptoms:
- tool pullout marks
- inconsistent finish
- tool release errors
2️⃣ Bearing Wear
High-speed operation amplifies imbalance.
3️⃣ Pneumatic Seal Degradation
Moisture in compressed air causes:
- slow tool release
- incomplete clamp engagement
Rebuild Process
- Full disassembly
- Bearing replacement
- Drawbar rebuild
- Belleville washer stack replacement
- Clamp force test
- Balance verification
- Thermal run test