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.
An operation performed on a lathe that feeds a tool at an angle to the length of the work piece in order to create a conical shape.
Taper turning on lathe can be produced by
1) Taper Turning by Tail-stock set-over method
2) Taper Turning by Swiveling the compound rest method
3) Taper Turning by Taper turning attachment method
4) Taper Turning by Form tool method