PMK High-Frequency Extra Long Spindles are specifically engineered for deep-hole grinding and specialized machining tasks where standard spindle reaches are insufficient. Featuring an extended, reinforced housing, these motorized spindles maintain extreme stability and precision even at the furthest reaches of their operational envelope.

Each unit is dynamically balanced and equipped with high-precision angular-contact bearings, ensuring smooth, vibration-free performance up to 60,000 RPM. The specialized design minimizes heat transfer and thermal expansion, which is critical for maintaining dimensional accuracy in deep-cavity workpieces.

Key benefits

• Extended Reach: optimized for deep internal grinding and complex machining zones that standard spindles cannot access.
• High-Speed Stability: capable of reaching up to 60,000 RPM while maintaining ultra-low runout (sub-micron levels).
• Thermal Management: integrated high-efficiency cooling channels prevent heat buildup along the long housing, ensuring consistent machining accuracy.
• Structural Rigidity: motorized design with heavy-duty housing minimizes deflection under load, ideal for finishing hard materials.
• Modular Integration: standard mounting interfaces allow for easy installation on cylindrical grinders, internal grinders, and custom machining platforms.

Applications

• Deep-hole internal grinding for aerospace and automotive engine components.
• Precision machining of long tubular workpieces and hydraulic cylinders.
• Specialized mold and die finishing requiring extended tool reach.
• Toolroom upgrades and retrofit projects for high-accuracy grinding equipment.