3500B-X4H-SP
3500B-X4H-SP is a high precision integrated spindle unit manufactured by SKF. This pre-assembled spindle assembly incorporates precision matched bearings, cast housing, main output shaft and mounting flange as one complete unit. Preload setting is finished at factory so no on-site bearing fitting or clearance adjustment is required. Widely adopted for CNC grinders, high-speed PCB drilling machines, precision milling equipment and custom automated machining power heads for high-speed cutting and grinding processes. The suffix X4H stands for extended front shaft design; SP represents super precision grade with strict dimensional tolerance and factory preset precision preload.
Description
1. Product Overview
3500B-X4H-SP is a high precision integrated spindle unit manufactured by SKF. This pre-assembled spindle assembly incorporates precision matched bearings, cast housing, main output shaft and mounting flange as one complete unit. Preload setting is finished at factory so no on-site bearing fitting or clearance adjustment is required. Widely adopted for CNC grinders, high-speed PCB drilling machines, precision milling equipment and custom automated machining power heads for high-speed cutting and grinding processes. The suffix X4H stands for extended front shaft design; SP represents super precision grade with strict dimensional tolerance and factory preset precision preload.
2. Key Technical Features
2.1 Rotation Performance
Equipped with precision matched bearing sets to support high rotating speed under dry or minimal quantity lubrication working conditions. Bearing preload is calibrated and locked during production to guarantee consistent rotational accuracy during long-term continuous operation.
2.2 Mounting Structure
The square housing allows two installation options: horizontal base mounting via threaded holes on housing or front flange fixing onto machine frames. The modular design enables direct bolt-on assembly on equipment without extra custom machining.
2.3 Shaft Configuration
Front end features locating flange for mounting grinding wheels, chucks or tool holders. Rear side extends with solid drive shaft for connection with timing belt pulleys or servo motor couplings.
2.4 Sealing and Lubrication
Adopts fully sealed structure with built-in long-service-life grease lubrication and dust-proof sealing construction, effectively blocking coolant and grinding debris ingress. The replenishment interval of lubricant is long under normal operating environment.
3. Application Scope
Precision automation power spindle, high-speed PCB drill spindle, compact CNC grinding spindle, customized automatic polishing and cutting power head.
4. Installation and Maintenance Instruction
Secure the spindle housing firmly to machine base with standard fasteners and align driving parts properly to avoid eccentric load during operation. Check running temperature and abnormal noise periodically during routine inspection. Keep sealing surface intact to prevent foreign substance intrusion. Avoid excessive overload and overspeeding beyond rated parameters.
5. Spare Storage Requirements
Store unused spindle units in dry, dust-free warehouse away from corrosive atmosphere and heavy vibration. Apply anti-rust protection on exposed shaft ends before long-term storage.
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