"Ignoramus17579" wrote in message
...
On 2009-08-11, DoN. Nichols wrote:
On 2009-08-11, Ignoramus17579
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

[ ... ]

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

That may depend on when it was made. Mine came with a diamond
wheel according to the maker. And I ordered a spare when I got mine.

Enjoy,
DoN.


Looks like I am wrong. I will check mine again.

i

On their website -- the actual Drill Doctor website, not the distributor
website -- they say one wheel is good for around 200 drill bits. If they're
using diamond, that fits. That's not very long for a superabrasive wheel of
any kind.

Diamond actually holds up OK grinding steel until it gets very hot. I don't
know how fast the DD setup runs, but it could last for a while with diamond.

--
Ed Huntress