John Doe wrote:
Mike Spencer wrote:

Cydrome Leader writes:

I grabbed a drill doctor 750X to play with. It sounds great in concept.

Here's my first thoughts from playing with it for an hour last night.
Gee, I've been using a little gadget I bought at Sears in the 70s with
great results. Has the same adjustable degrees of freedom as an
industrial version I used in a Michelin millwright/machine shop
mounted on a big pedestal grinder. The Michelin one handled over 2"
dia. while mine only does less than 3/4". Dunno what it's called or
who made it, unpromising pot metal construction but no problems in 40
years. Keep it mounted on its own little wheeled stand with a cheapo
spindle, old pump motor and the right side-grind wheel.

Post a YouTube video, or at least a picture. Or find a picture of it on
google images or wherever.

Sounds like the old General Tools No.825 AKA Craftsman #6677 drill jig.
Been around for ages AND if you pay attention to the directions they
work real well.

http://www.generaltools.com/825--Ori...ent_p_213.html

in use
https://www.youtube.com/watch?v=BQuFlmIPw3A

I have one myself and the only things I did different was to go buy a
separate grinder and side cutting wheel so it could be used easier.
I mounted it so that the wheel cuts at 90 degrees to the cutting edge on
the flute. That was done by simply attaching the jig on the centerline
of the grinder shaft so it contacts the wheel at the top. This was done
in response to a few people commenting on the bit orientation causing
possible fractures of the cutting edge due to the stress risers from the
grinding marks.

--
Steve W.