The reasons for the main shaft shaking are as follows:
The tail of the main shaft is not tightened or cannot be tightened;
The gap between the safety pin and the safety pin sleeve, and between the safety pin sleeve and the safety pin seat hole is large;
The main shaft bearing fence is deformed or the bearing is worn;
The inner hole of the ring die is out of round by ≥0.30;
The gap between the two rollers is not adjusted evenly, etc.
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