auto-balancing bench grinder arbors

[mattthemuppet]

thanks you two. The Norton wheel has always been pretty well balanced, although the bore isn't completely perpendicular to the sides, which is a bit of a pain. There wasn't any difference that I could tell in vibration between the grinder with nothing on it (smooth as silk) and the stone wheel, so I think the big problem is the wire wheel.

When I get home tonight I'm going to cut the groove deeper and wider to try some bigger bearings. No idea on how full the groove should be, but intuitively 1/3 sounds about right. More than half and they wouldn't be able to distribute themselves properly, at least that's how it looks in my head. I'll report back!