Machining a hemispherical cavity in the end of a bar. Any tips?

What size lathe are you using? The 100mm large size might be a challenge on my 11 inch Logan. And I sure don’t want to waste a piece of aluminum that large.
But I might make the tool just to see it work. Maybe I need some wooden bowls?
jimsehr
Colchester student 1800.
 
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