If drilling - not on a lathe ? -

I'd use a cone drill that maxes out to that size.
It self centers and if several steps are in action -
will continue. Mine have carbide blades on a slot
in the cone and does nice in high chrome steel.

A twist drill won't center - as the hole is already there.
It would have to be centered and the drill driven there as
on a lathe.

I'd be concerned to balance - Please plan on truing them
up with a diamond as an unbalanced wheel can explode.

Martin

Bill wrote:
"Bill" wrote in message
...
"CW" wrote in message
m...
"Bill" wrote in message
...
"Michael Faurot" wrote in message
...
Bill wrote:

IIRC, someone provided some info about how to bore out the centers of
the wheels. I don't have a DP yet though, so I'm not sure where that
leaves me for the time being.
My recollection of drilling out the centers of the grinding wheels, is
that I didn't use a drill press. I believe I used a brace[1] as I
wanted
to be sure nothing would get out of control on me. Once the bit
started chewing on the plastic, there wasn't much material in the
actual grinding wheel that needed to be removed.

[1]: The brace I used is a little different than the typical one you
find. Mine has four fingers in the chuck and can properly grip
standard drill bits.

Michael,

I can understand your wish to make sure nothing would get out of control
on such an operation! I have a brace (and some of the standard auger
bits that
accompanied it)--I was just keeping it around for "posterity", maybe I
should
check if I have a 1" auger bit. That's what I would use, correct?
You don't want to use an auger bit as it will not center on the hole. Use
a regular twist bit.
Thank you for your comment. I may need to purchase one of those regular
1" bits.
I hope they have them for 3/8" drive! I'll go take a look at Sears...

Bill

Sears has them for about $28...1/2" drive of course. I don't think I'm
comfortable doing
this without a drill press anyway. Maybe I can pay someone at Woodcraft to
drill.

Thank you,
Bill