I have both, the black diamond does a better job, but is a bit slower
because you have to match the collet. the finish with the black diamond is
as good as its going to get with type of machine.
"Chuck Sherwood" wrote in message
...

I am researching drill bit grinders. I thought I wanted a Darex M5 but
I ran across a Black diamond brand. I don't know much about them, but
they seem to have a good reputation. Any advice on what to look for,
what to avoid etc? How many different models are there?
I realize they use collets and it appears the one I found has a complete
set.

thanks
chuck