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-   -   Bending, flaring tight bends (https://vansairforce.net/community/showthread.php?t=85156)

Jim Edwards 04-15-2012 09:51 AM

Bending, flaring tight bends
 
I'm struggling with the flared tubing between the Andair fuel selector and the Andair fuel filter/boost pump. Here's the problem: My Parker Rolo Flare tool requires 3/4" of tubing to clamp the tube prior to making the flare and the AN819 sleeve adds another 1/2". Any tricks here to make the start of the bend closer to the flare? Thanks.

aerhed 04-15-2012 10:20 AM

Best you can do is flare first, then slide 819 to flare, then start bend behind the 819.

Buggsy2 04-15-2012 10:23 AM

What @aerhed said. Also, google for another flairing tool that doesn't require as much length as the standard Rolo Parker. I've heard they're out there.

131RB 04-15-2012 10:53 AM

Vince Frazier has a nice tip for this on his website worth taking a look at. Check out vincesrocket.com and look under the engine section.
Ryan

Aaron C 04-15-2012 01:17 PM

After spending many, many, many hours on this problem, I finally ended up just moving the Andair pump forward an inch or two. Then there was enough room to have a longer tubing piece, which made it possible to make the bends properly. I ended up ordering a new center cabin cover, but that was minor compared to all the hours spent trying to make the tube bends work beforehand.

TS Flightlines 04-15-2012 02:23 PM

Jim---
I modified my bender to move the nut and sleeve back--towards the bend arm. If I need to make a real tight bend, I bend the tube and install the nut after bending. I also made a mandrel to put inside the tube to support it against the bend brace on the bender. Works great.
Tom

Buggsy2 04-15-2012 02:39 PM

@Tom: would you mind posting a pic of your modified bender?

Jim Edwards 04-15-2012 03:35 PM

Many thanks to those who have responded. I greatly appreciate the suggestions. Aaron, I may end up using your method. (We share a common bond with the many, many, many hours invested in what looks so simple on paper.) Tom, I can't visualize exactly how you modified your bender (I have a Harbor Freight cheapie as well as an Imperial 370 FH) but I, too, have thought about inserting a mandrel to give the bender "hook" something to hold on to. With the 3/8" tubing that I am using, the smooth shaft from a 19/64" drill bit seems the right size. I'd appreciate a photo, also, when you have the time. Thanks again.

TS Flightlines 04-15-2012 07:05 PM

Hey Buggsy--Yep--I'll take a pic of it tomorrow and 'try' to post it. May need some help doing that. If not---I can email it to you.
Just so you'll know, Its a Imperial 470-FH. Nothing fancy, but I added a piece of angle to it so I can lock it in a vise. Much easier to use 2 hands and not fight it. I bend aluminum 5050-O and 304 stainless .035 wall with no issues.
(the stainless takes some muscle; thats the reason for the piece of angle and vise mounting).
Tom

TS Flightlines 04-16-2012 01:01 PM

i have pic ---just have to figure out how to upload them here!
Tom
:eek:


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