In article , Alden Hackmann says...

How about a wheel that is tapped (half) and reamed (half)? Would the phenolic
threads hold up? I would think so. Would the
half that's bored straight be enough to stabilize it?

I would say that if the phenolic is about an inch thick now,
one half inch of threads would probably do fine. A half inch
of straight shaft would certainly center it up properly.

I would suggest putting the blank in a chuck, and profiling one
face, and then drilling and tapping the entire thickness. Then
go in with a boring bar and bore out to the shaft diameter.

The final step would be holding in a mandrel, *centered* on
the finished bore, with a center hub as I previously described,
and turn the OD. Then the OD will be exactly concentric
with the bore.

Jim

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