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In article ,
(DoN. Nichols) wrote:

It would be nice to have a tool specifically made for chamfering
steel line before double flaring, using a file doesn't always
work out well and the results give so-so uniformity...

Something sort of like chalking a pool cue if you get my drift.

Any ideas?

Yep! There is a tool made for cartridge reloaders (firearms) to
apply after a case-length trimmer. (The case stretches a little with
each firing, and it eventually needs to be trimmed back to length.) One
end looks like a Severance brand multi-flute countersink, and the other
looks like the inverse (only three flutes, IIRC) with a guide pin to
start it roughly centered.

One of these should to a nice job of both chamfering the ID and
the OD to remove burrs.

The one which I have was made by RCBS.

A quick web serach finds the web page describing it:

URL: http://www.rcbs.com/default.asp?menu=1&s1=4&s2=3&s3=17

The pin may be a bit too large for the 1/4" copper or steel line, as
it is expecting a minimum ID to hold a .17 bullet (0.170").

But Severance does make some OD chamfering tools which are like
an inverse of their multi-flute countersinks.

Thanks Don.

I'll stop by the gunsmith on monday and see what he can get his
hands on. I googled on "Severance" and found their website, I'll
probably call them monday also.
I make a lot of brake and fuel lines for cars and trucks, the
success of the double flare depends on how well the tubing is
chamfered, many times you only get one shot at it before you have
to start from scratch.