Spindle Repair

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:

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.

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.

Re-Installation

Spindle 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:

Factory Contacts

John Hart Factory Contacts
At John Hart we don’t just rely on electrical manuals or generic “equivalents”. Instead we have access to factory information, procedures and parts 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 PCB will perform properly.

Warranty and Maintenance

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.

For more information on John Hart quality Spindle Refubishments contact National Customer Support