On 2010-05-05, Garrett Fulton wrote:

wrote in message
...
On May 3, 11:38 pm, "Bill Noble" wrote:
while the 99% scream about politics, can the three remaining people who
remember anything about metal and working chime in here?

I use a chucking reamer to make accurate holes after drilling them on my
lathe (these are adapters of various kinds) - I center drill, then drill,
then put the reamer into the drill chuck to ream. But there is a problem -
drill chucks, even on the best of days are not high precision - the spec
is
.015 runout measured 2 inches from the chuck at 1/2 max diameter (from the
Jacob's site) - so with a chucking reamer that is 6 to 8 inches long, that
.015 becomes a much more significant number. The answer is, of course some
kind of floating holder - and I can get ones in various configurations -
so
the question is, what makes sense? Glenco makes nice units with a MT3
(male and female) so one can put them in series with the chuck, there is
quite a range of other units

thoughts, about this subject please (no politics - let's see if it's
possible)

--
Bill -www.wbnoble.com

There are floating reamer holders, gunsmiths use them all the time
with chambering reamers. I assume they're a standard item in the
supplier catalogs. Here are a couple, don't look too complicated to
make:
http://www.midwayusa.com/Search/#rea..._1-2-4_8-16-32

Stan

Rank amateur machinist that I am, I have to ask this dumb question. The
reamer used in this gunsmith floating holder would have to be prevented from
turning once engaged in the hole, right? With a tap wrench, etc.?

A chucking reamer does not have the flats needed for a tap
wrench to be of use. That only works with a hand reamer (which also has
a much longer lead-in taper).

The floating reamer holder allows the reamer to self center, but
prevents it from freely rotating.

Enjoy,
DoN.

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