How did I know that would get your attention?
For the gentleman looking to drill and tap a steel ball.... I have just unearthed a small store of 23mm bearing balls. (Ex Case tractor axle ISTR).
Free to good home:-)
regards
I wonder what happened to my home-made Newtons cradle? (Except I ground a flat on the balls and brazed brass nuts to them.)
I heard that some program like Mythbusters tested various sizes of steel balls for Newton's cradles, and as the balls got bigger they bounced worse. Did anyone see that?
I suspect that steel balls the size of cannon balls would damage themselves, and be too dangerous to be touched by the public. I did some tests on bouncing 25mm steel rod which looked promising. I was going to put the rods inside light plastic balls.
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