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ČeštinaCHIRON HSK 63A spindles repair – CNC service and balancing
Overhaul of two CHIRON HSK 63A spindles – precision bearing replacement, taper restoration and express door-to-door delivery
Two spindles from the renowned CHIRON brand, operating in machines from the same manufacturer and equipped with HSK 63A tapers, arrived at our service center. These components are crucial for maintaining the highest machining quality – responsible for transmitting torque to the tool and ensuring stability during cutting. In both cases, the customer reported clear signs of wear that negatively affected production: increased noise, noticeable vibrations and a drop in dimensional accuracy of machined parts.
Spindle specifications
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Manufacturer: CHIRON
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Taper: HSK 63A
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Machine: CHIRON
Step one
CHIRON HSK 63A spindle diagnostics
Detailed diagnostics confirmed that the problem was caused by worn spindle bearings. We decided to replace them with FAG bearings of the highest K5 precision class. Such bearings feature minimal rolling resistance, excellent stability at high rotational speeds and very low radial and axial runout.
Installing components of this class ensures the spindles will operate just as precisely – and often even better – than when they left the factory. The replacement process included removing worn elements, cleaning the housings, checking geometry and installing the new bearings in conditions ensuring full cleanliness and controlled temperature.
Step two
HSK 63A taper restoration
The next stage was restoration of the HSK 63A tapers. Over time, due to intensive use, their surfaces develop micro-damage, deformations or dents. This results in poorer tool seating, lower machining quality and the risk of vibration. Our restoration procedure includes precise taper geometry measurements, removal of all damage, and precision grinding to restore dimensions in accordance with the manufacturer’s specifications. After the work was completed, the tapers regained their original geometry, ensuring secure and stable tool clamping.
Step three
CHIRON spindle balancing
After restoring the tapers, we proceeded with precision spindle balancing. For these CHIRON models, we carried out balancing to the highest possible accuracy class – 0.4G according to ISO 1940. This process is crucial as it minimizes vibration transferred to the tool and workpiece, improving surface quality and extending the life of both the bearings and the entire spindle assembly. Balancing is performed on specialized measuring machines, allowing precise rotor mass correction through targeted drilling or adding material in strategic points. The result is quiet, stable operation and significantly reduced mechanical loads during operation.
Express repair
Door-to-door service
In this case, turnaround time was particularly critical. The customer required the spindles in express mode, so we offered a comprehensive door-to-door service. The spindles were collected directly from the customer, securely packed in special transport crates with cushioning inserts and moisture protection. This solution ensures full safety of the components during transport, eliminating the risk of mechanical damage or contamination.
After completing all work, performing functional tests, final measurements and preparing the documentation, the spindles were immediately prepared for shipping. Delivery took place on a Saturday, which for our team is no issue – we understand how important time is in production and that every day of downtime means losses. Both spindles travelled nearly 400 kilometers to return to work in the customer’s machines as quickly as possible.
Final result
The two CHIRON HSK 63A spindles, after FAG K5 bearing replacement, taper restoration and 0.4G balancing, now operate with the precision of new units – and in many respects exceed factory specifications. The customer received fully operational components ready for intensive use, and the entire process – from collection to delivery – was completed in record time while maintaining the highest quality and safety standards.
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