Cannot be released, the collision tool bearing is locked, the cutting tool is hit, the bearing accuracy is lost, the combination of the pulling tool cannot be pulled tightly, the bearing is locked, the accuracy is severely worn, the heat is severe when rotating at high speed, it only makes noise without turning, and the sound is prone to constant noise. When cutting, it stops without changing speed or gear, cannot stop accurately, the accurate stop position is inaccurate, the water circuit is blocked, and when it reaches * * *, there is noise. When working, the sound becomes louder, especially hot, the temperature difference between the inner and outer rings of the bearing is large, the water circuit is blocked, and there is rust at the inlet and outlet. It often leaks oil, vibrates, and the no-load current is too high. The whole machine is balanced and debugged, and after running for a while, it is overloaded with 0L. As soon as the power is turned on, Severe heating, occasional tripping, can be used again after restarting, high operating current, rusted return water circuit, rapid heating after bearing replacement, and continuous water leakage, Frequent burning, large jumping, water ingress, wear and tear of the rotary joint, moisture absorption, oil leakage, inability to rise and rotate due to excessive load, bearing replacement needed, old burning encoder stuck and did not automatically stop, water outlet rotary joint kept breaking and unable to move up and down, air leakage, rough taper hole, corrosion and radial jumping of taper hole, internal grinding of taper hole, taper hole repair, poor taper grinding and pulling tool, burnt taper hole grinding coil, spindle gripping tool alarm tool clamping problem, unable to clamp, dynamic balancing, running in table