[Fot] Source needed for single-flare brake lines

[Bill Babcock]

Perhaps you have to try these fittings and tools to appreciate this, but
the 37 degree single flare is the coolest thing since sliced bread as
far as I'm concerned. They take seconds to make up, they never leak,
they don't crack or deform unless you're astonishingly ham-fisted, and
they're reusable. I've taken them on and off Peyote dozens of times with
no difficulty. I wouldn't use anything else.

In contrast I've struggled with double flares. They're hard to get
perfect, they get uglier each time you take them off and on (in
particular the lip of the flare where the sharp bend is gets thinner)
and you're not really supposed to reuse them at all--they're designed
for single tightening. Bubble flares even more so. I'm trying to find my
AN plumbing book that I bought from Aircraft spruce many years ago. The
Carroll Smith book is short on theory--just says to use them.

________________________________

From: Chuck Arnold [mailto:triosan at gmail.com]
Sent: Wednesday, January 10, 2007 11:02 AM
To: John Herrera
Cc: Fubog1 at aol.com; vinttr4 at geneseo.net; Bill Babcock;
hottr6 at hotmail.com; fot at autox.team.net
Subject: Re: [Fot] Source needed for single-flare brake lines


The point with JIC/AN/37 degree single flares with tube nuts and tube
sleeves is that the flare does not do the sealing.  The tube sleeve
applies stretch/push aginst the flare, sealing it to the mail fitting.
Reusable as the flare does not disotrt.  I have made hindreds of AN3, 4
and 6 JIC flares with the Aircraft Spruce single flare 37 degree flaring
tool in both steel and aluminum tubing.  To my knowledge, none have ever
leaked or cracked.
Chuck


On 1/10/07, John Herrera <jrherrera90 at hotmail.com> wrote:

	>hmmmm... exactly why I don't use single flare, they crack. I
would suggest
	>that the steel bundy tubing is perhaps more malleable than that
used in
	>aircraft? FWIW I never have cracking problems with automotive
type bundy
	>tubing.
	>Just speculation on my part though. This is an interesting
topic
	>nonetheless.
	>Glen

	That's probably it. That's why I put the "Dunno" disclaimer in.
The double
	flares would crack right around the outside of the overlapping
bend for the
	"double" part of the flare. Maybe something was wrong with our
tool.

	Single flares get radial cracks when students overtighten the
flaring tool;
	it squishes the material. Or from overtightening the B-nut in a
misguided
	attempt to fix a leak.

	John
	_______________________________________________
	Fot mailing list
	Fot at autox.team.net
	http://autox.team.net/mailman/listinfo/fot





--
Chuck Arnold