We do Rebuilds and Remanufacturing of All ATT Hardinge spindles

Our ATT Hardinge spindle repair processes are the best in the business. We have state-of-the-art in-house resources and trained technicians, so that your repaired spindle will be better than new when we ship it back to you. More importantly, we have full access to parts as well as complete manufacturing capabilities that allows us to repair your machine tool spindle properly the very first time. GTI Spindle is the company for your ATT Hardinge spindle service and repair needs.


ATT Hardinge Spindle Rebuild Services


Our technicians thoroughly inspect the spindle to identify the problem correctly before moving ahead with any spindle repair work. All spindles are subjected to the following 5-point assessment:

Incoming Vibration Analysis

Incoming vibration analysis is performed in order to determine: bearing condition, level of unbalance and/or any other defect frequencies that may exist.

Assembled ATT Hardinge Spindle Inspection

Pilot ID or taper runout on tool end of shaft to determine possible spindle crash or improper tooling.

Rear taper runout inspection to determine possible over tightening of belts or improper pulley fit.

Preload test to determine bearing wear or spindle crash.

Disassembled Spindle Inspection

Pilot ID or taper inspection to determine spindle crash, improper tooling or overheating. Bearing journal inspection to determine improper bearing fits or use of spindle after initial failure.

Overall shaft condition to determine crash, overheating, lack of coolant or overloading.

Bearing Condition

An inspection of bearings is performed by trained bearing specialists to determine lack of lubrication, over speeding, spindle crash, overloading, loss of preload, contamination (coolant or other material) or overheating due to electrical problems. In addition, we have the access to all Bearing OEM’s facilitation and personnel.

Engineering Recommendations

We recommend spindle design changes or enhancements to improve ATT Hardinge spindle longevity and/or performance. For example, if a spindle has failed due to contamination, a design change such as new labyrinth nuts, air purging, hybrid bearings, or improved sealing design will be recommended and implemented.

What GTI Provides:


The spindle needs to be removed from the machine tool. Removal can be done either by the customer themselves or by GTI technicians who can be sent to the client’s site for removal of the spindle.


Post planning of ATT Hardinge spindle repair corrective actions, rebuilding as well as preventative maintenance work advice is given which needs to be taken care of before installing the spindle back into the machine.


The spindles are tested to check if all the machine interface parts such as encoders, proximity switches etc. are functioning properly and all spindles have to pass the vibration analysis and review of an autonomous GTI QC manager.


ATT Hardinge machine tool spindle post repair are reinstalled and checked for performance and reliability; which can be executed upon customer request by a GTI technician. Detailed documentation of the repair work is provided to all GTI customers.

Our ATT Hardinge spindle repair service will give you a spindle that will return to the floor as good as new. We offer one year warranty after every repair and re manufacturing. Call us at 888.473.9675 or you can mail us at info@gtispindle.com for an estimate on time and cost.

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