util hacer bolas en el torno

http://www.shinyobjectdesign.com/staff/paul/holescreek/images/Image041.jpg




http://www.shinyobjectdesign.com/staff/paul/holescreek/downloads/Holescreek%20Logan%20Lathe%20Ball%20Turner%20Full%20040206.jpg

http://www.shinyobjectdesign.com/staff/paul/holescreek/downloads/Holescreek%20Logan%20Lathe%20Ball%20Turner%20Left%20040206.jpg

http://www.shinyobjectdesign.com/staff/paul/holescreek/downloads/Holescreek%20Logan%20Lathe%20Ball%20Turner%20Right%20040206.jpg

http://foro.metalaficion.com/index.php?topic=20975.15

http://foro.metalaficion.com/index.php?topic=15245.0  http://www.machinistblog.com/downloads/Patterson/Ball%20Tool.pdf