On 2010-07-13, Ignoramus3537 wrote:
On 2010-07-13, Lloyd E. Sponenburgh lloydspinsidemindspring.com wrote:
"Robert Swinney" fired this volley in
:

DRO ??

Bob Swinney

Drill relocation option.

Special tool on his mill.

(Digital Read-Out) G

I have a DRO. The issue is, if I move to point (1.2345, 6.5432), and
plung the drill down, will the hole really be in thast point or
somewhere close due to drill wandering.

Better if you start with a spotting drill -- or even a center
drill -- which are not long enough to flex much. But if you use a split
point, you will still have very good centering compared to a standard
chisel-point jobber's drill. Using screw-machine length drills
(shorter) will also provide less flex room.

I keep a set of split-point screw machine length drills for
frequent use, and a 1/2" split point drill (jobber's length) in the
stand by the lathe for starting holes for boring. I've also got a set
of 1/16th to 1/2" jobbers length drills with split points.

To show how little walking there is, I used the 1/16" bit to
hand held electric drill in place a cross hole in a 1/4" shaft for a
cotter key (to keep the track roller for the garage door from walking
out of its brackets), and the hole was close enough to straight
diametrical so I would not be ashamed to show it to anyone.

Enjoy,
DoN.

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