ball radius turner needed

[toag]

not a bad idea! and you'd only need 1/2 of the cut of part, that way you wouldnt have a upward and downard force (twist really) on your toolholder.

I would also look into Andy's stuff at MLA. he has a boring/ball turning casting that looks sawweeett!
http://www.statecollegecentral.com/metallathe/MLA-13.html

 

[mikey]

I would use a graver - it is perfect for this kind of work.

 

[n3480h]

I've used the method jamesmelville suggested to turn brass rod into a shape like an aircraft spinner. It worked well.

Tom