I had a somewhat similar problem. In my case, I needed to drill two orthogonal holes through 1/8" diameter brass balls used as part of miniature universals. The jig and procedure is described here...
http://www.homemadetools.net/forum/d...-spheres-27292
Drilling larger holes in larger spheres involves a different approach...
http://www.homemadetools.net/forum/d...-spheres-27291

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