Answer is:
To avoid damage to the centre drilled hole of the job
Explanation:
Ball centre is sometimes used for tapering by the "set-over tail stock" method. The standard centres cannot sit squarely in the center hole when the tail stock is set over.
![Why the ball centre is preferred in tail stock offset method?](https://mcqfinder.in/uploads/images/objective-questions/turner-set-2-taper-turning/turner-set-2-taper-turning-id-26-e.jpg)
Answer is:
Form tool method
Answer is:
8 mm
Answer is: