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First, if the material is too long, there will be a tool making phenomenon during the cutting process.
Second, the lathe clearance is too large, and the screw clearance can be beaten.
Third, the procedure is wrong.
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Try the spindle tightly, or see the spindle runout.
When the spindle is running for a period of time, the bearing is heated sharply, and the gap between the jacket and the ball is too small, resulting in the bearing rotating inflexibility, and even burning. Just send away a little spindle nut!
It's best not to put your phone at the head of your bed!
The workpiece turned out by the lathe has a taper, which means that the center of the machine tool chuck and the tailstock are not concentric, that is, the axis of the workpiece is not parallel to the route taken by the tool holder.
Peach swords can be hung, or peach carvings can be placed.
You can't have too many things at the head of the bed, and it's easy to dream.