I know these work well on flat or almost flat surfaces, but he is doing
the
drilling in a rathe small tube. These devices don't really work well in
those circumstances.

Joe, I disagree. Im my experience the cogsdill burraway tools work
well when deburring holes that go into or out of a curved surface. In
fact, my first experienvc with these tools was using them to deburr
holes in tubing.

Eric,

I can agree that they work well on some tubing, but I think this application
is a rather small tube. In other words, the ID curve is probably small
enough to make the deburring tool hit only on the "sides" of the hole but
not the "top" and "bottom" if viewing the tube horizontally.

The cutter works on a spring action if we are both talking about the same
device... And more pressure is applied to the thin wall aluminum tube when
it is sprung in farther as would happen on a tight radius of a small
diameter tube...

Then again, I've been known to be wrong often so all of my theory-thinking
above may be worthless. grin

Regardless, I think the best bet to deburr the inside of a small tube is to
run a precision reamer or drill down the tube from the open end. As long as
that tool is .001 to .002 oversized as compared to the second tube that will
be inserted into the first that was drilled, you will get a great fit and
all the burrs should disappear more quickly.

That method will work on any tube that has a semi-smooth interior as long as
you can get a reamer or drill with an extension long enough... And it won't
really matter what the burr size is so a feed controlled drilling machine
might not even be necessary.

Regards,
Joe Agro, Jr.
http://www.autodrill.com
http://www.multi-spindle-heads.com

V8013

My eBay: http://tinyurl.com/3n8gj