Spare Parts 
Service & Support Centre 
Electronic Repair Facility 
Spindle Repair Facility 
Redundant Parts | Spindle Repair Facility - SRF |  |
Is your machine tool spindle noisy or producing a poor surface finish? Does it have excessiverunout, poor high-speed performance or suffer from vibration? If it does, the John Hart Spindle Repair Facility can help.
Refurbished Spindle Life
Machine tool spindle bearings are designed for extremely long working lives. There is no reason for a rebuilt spindle to give a shorter working life than the original unit if correctly rebuilt, tested and installed.
Spindle Failure
The enemies of spindle accuracy and long life are:
- Unintended Shock (machine “crash”)
- Damage to the Spindle main shaft
- Contamination in the lubrication system
- Over-demanding applications
Parts and Procedures
We only use factory bearings and greases to ensure that the critical pre-loads and interferences (measured in a few microns) are achieved. When the spindle has been rebuilt it is balanced on a NATA certified rig before being run-in on our PLC controlled spindle test rig. The spindle is exercised at different speeds to ensure that the grease is correctly dispersed within the bearings and temperatures are monitored to further verify that pre-loads conform to factory specifications.
Re-installation
Once our trained and experienced Service Engineers return to re-install and re-align the spindle and have verified the correct operation of the lubrication system the machine is ready to be returned to production.
Re-built Spindle Failure modes
A re-built spindle may fail due to:
- Contamination (during rebuild)
- Use of non-factory bearings (resulting in incorrect pre-loads and alignments)
- Inadequate balancing
- Incorrect lubrication or greasing
- Inadequate bedding in
Spindle Repair Facility Standards
At the John Hart Spindle Rebuilding Facility machine tool spindles are re-built to exacting standards, using the correct factory specifications, parts, and procedures. All metrology and assembly work is carried out in a clean-room and the almost obsessive attitude to cleanliness is extended throughout the entire Spindle Repair Facility workshop.
Factory Contacts
At John Hart we don’t have to rely on advice from general bearing suppliers, out of date procedures or guess expansion coefficients from catalogues. John Hart has access to factory information through our resident Mazak Engineer who is in contact with Mazak, Japan. This allows us to get the very latest information and advice to ensure that your re-built spindle performs to the highest standards.
Warranty and Ongoing Maintenance
Our warranty program and Preventative Maintenance schedules will then ensure that the re-built spindle continues to provide years of reliable, accurate service.
At the John Hart Spindle Repair Facility we are confident that we offer the most comprehensive, quality spindle re-build for your Mazak machine tool.
- Factory Parts and Specifications
- Factory Procedures
- Experienced Spindle Specialist
- Fastidious commitment to quality
- Balancing (NATA certified)
- Run-in/Pre-conditioning
- Skilled Re-installation and re-alignment
- Ongoing Warranty and Support
For more information on John Hart quality Spindle Refubishments contact National Customer Support