If the NSK speed reducer is connected between the motor and the spindle,it reduces the rotating speed and increases the torque while keeping the motor speed unchanged. • Maximum allowable motor speed: 30,000rpm • Maximum rotating speed at the cutting tool: 7,650rpm • Speed Reduction Ratio: 1 / 3.92 • Speed Reducing Mechanism: By planetary gear system • Weight: 3.81 oz. • NSK Catalog Number: AS11414