Abstract: The present invention relates to an improved spindle. The spindle uses improved shrink fit technology. This spindle is heated by means of an electric heating coil. This causes the internal diameter of the spindle bore to expand large enough to fit a toolholder that is manufactured to the predetermined size of 0.0015 per inch of diameter larger than the internal diameter of the spindle bore when both are measured at room temperature. After the toolholder is placed in the spindle a refrigerant blast cools the internal diameter of the spindle bore. This causes the spindle to grip the toolholder in an extremely rigid fashion having a desirable effect on the overall concentricity of the toolholder. The improved shrink fit technology is apparent when removing the toolholder from the spindle. The toolholder is manufactured using a predetermined type of steel with a lower thermal expansion rate than that of the internal diameter of the spindle bore.