Line maintenance projects are: the main bearing replacement, the spindle taper hole grinding, spindle's dynamic balance is positive, the stator coil winding, replace the spindle rotor replacement, spindle, spindle disc springs pull claw change, solving the problem of top PCB drilling and milling spindle die, motorized spindle high-speed motor waterway impassability, motorized spindle high-speed motor partial problem, electric spindle vibration problem of high fever, the spindle noise is big problem, the electric spindle high-speed motor  radial runout slants big problem.