What is the advantage of tailstock spindle having left handed threads ?

What is the advantage of tailstock spindle having left handed threads ?

Avoid advancement of barrel when rotated clockwise

Ensure that the barrel advances with clockwise movement of hand wheel

Reduce the tendency for excessive movement of the barrel

Avoid jamming of spindle and hand wheel

Answer is:

Ensure that the barrel advances with clockwise movement of hand wheel

Explanation:

Advantage of tailstock spindle having left handed threads is that it ensure that the barrel advances with clockwise movement of hand wheel.

What is the advantage of tailstock spindle having left handed threads ?

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