On Sat, 19 Jul 2014 16:16:03 -0700, wrote:

On Fri, 18 Jul 2014 18:33:37 -0500, "Lloyd E. Sponenburgh"
lloydspinsidemindspring.com wrote:

fired this volley in
m:

You have hit the core of the problem which is the deformation of a
thin-walled conduit while cutting. Following on from your thoughts I
suspect I should get much better results even using a hand cutter if I
put a mandrel through the conduit first. Maybe even a wooden one.

ALWAYS use a close-fitting mandrel when cutting thinwall _anything_.

'Rule of thumb'


Besides, do you want to then have to chamfer the i.d.? I use the
closest-fit I can get, and hard enough material so that the pipe cutter
won't cut into the mandrel. I can always re-sharpen the wheel, but
sometimes it's tough to get a short piece of tubing off a mandrel where
the tube has been swaged into the groove in the mandrel.


LOL!

I discovered this little fact probably as you were writing about it. I
grabbed the first piece of wood I could find which was a pick-axe
handle. I put the brass conduit as far as I could on the handle taper
which turned out to be too far. I cut a nice ring and now I have two
pieces of pretty brass decoration as neither piece will come off due
to the phenomenon you described.

g I think we've all had to learn that particular lesson the hard
way.


I cut a second conduit lower down on the handle with a good result.

I was just about to suggest putting cutter just beyond the end of the
handle, so the handle lent support, but wasn't directly under the
cutter.

Carry on.

--
Liberalism is the result of severe pathogens in our society.