On Aug 11, 8:32*am, Ignoramus17579 ignoramus17...@NOSPAM.
17579.invalid wrote:
On 2009-08-11, Calif Bill wrote:



And hey, wait a minute! the Drill Doctor is an example of a machine
DESIGNED to grind HSS with a diamond wheel. I've done hundreds of bits
on mine, including a couple of broken ones that needed a lot of
grinding, and the wheel still cuts fine.

The wheel in Drill Doctor is not diamond, it is CBN.

i

Mine is diamond.