Everything we rebuild is dynamically balanced to G0.4 mils peak to peak or better at maximum rated RPM, and the balancing data ships with your spindle. expert staff using state-of-the-art equipment to G0.4 mils peak to peak or better at the maximum rated RPM.  The balancing data is recorded, documented, and provided to you, the customer with the delivery of your spindle.  This level of care will ensure your spindle achieves the best possible surface finishes, the longest life, and operates quietly.