Motor City Machine Tool specializes in GMN spindle repair for CNC machine tools such as: HMCs,
VMCs,  and Grinding Machines.  

We replace and in stall new: precision bearings, seals, o-rings, and all damaged components.
All components are tested:  Motor  winding, drawbars, encoders, and Vibration Analysis is performed on all
spindle bearings.

We can rebuild your GMN milling spindle, GMN turning spindle, GMN grinding spindle, GMN  Spindle
Motors, GMN HMC spindle, GMN VMC Spindle, and High frequency GMN spindle.





All GMN Spindle Repairs are test run to maximum rpm
GMN Spindles are initially ran at 5% of maximum speed.
Bearing Temp & vibration are checked.  Once verified to be with  OEM specs,
the rpm is increased to 10% of max. rpm.
All spindle units are checked before & during the increase of rpm at all intervals
Once they are proven to be within OEM specs they are increased by 10% intervals
of the max rpm until achieved.
When max rpm is achieved the spindle is ran for 1-2 hours
Bearings are monitored for velocity and displacement
Only when bearing temperatures & the vibration analysis readings are within OEM spec is the unit approved
for shipment.



Lead Times                                                                             Warranty
1-3 Days for Emergency Repair                                               All GMN Spindle Repairs have a
1-2 Weeks Standard Repair                                                      full 1 year warranty.
GMN Spindle Repair
Motor City Machine Tool Repair can rebuild any GMN VMC spindles, GMN HMC spindle, GMN grinding spindle, GMN
high frequency spindle, GMN motorized spindle etc....  We stock all necessary components to ensure the best possible
lead times.  
Sales@motorcityrepair.com

32535 Schoolcraft Rd
Livonia, MI 48150
(734) 261-8600  Office