Under normal circumstances, slender objects are easy to bend under pressure, but not easily deformed under tension. Adopt positive feed (feed from the tailstock to the headstock direction)
During turning, since the workpiece is clamped in the chuck,
The axial component force generated during cutting is directed to the headstock to press the workpiece, and it is easy to bend the slender shaft. And use reverse feed (feed from the headstock to the tailstock direction).
When turning, the axial component force generated by the cutting pulls the workpiece toward the tailstock. If the top tightening force is small at this time or an elastic rotary center is used, the workpiece is in tension, and it is not easy to cause bending and reduce the slenderness. Deformation of the shaft.