R8 Arbor Questions

Focusing on threads to register concentricity is unproductive. Just counterbore a shallow depth and turn boss size to size, that takes up on a shoulder, not bottom on the bore. Concentric, square, perpendicular and rigid all in one.
Bingo.

PS. Ever see someone theoretically 'assure' position with flat head screws, as if they are dowels? The body and flat head portion are never concentric or consistent in relation to clocking of the eccentricity to threads. And if you refasten with same screws but in other positions it'll not be same as before either.
 
With a boring head, it seems to me that it's purpose is to 'not be concentric' so concentricity of the mount should make no difference. Not so with other types of tools.
Aaron
 
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