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Bending small tubing

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Old 03-13-2006, 05:10 PM
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redfox435cat
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Default Bending small tubing

I got 3 vipers now. one for fun and a couple to race with. With the stock engine mount you have to go out the side with the fuel tubing. Anyway this is a real tight bend. Any suggestions on making tight bends in 1/8-5/16 brass or aluminum tubing without chiggering it up
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Old 03-13-2006, 05:27 PM
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Default RE: Bending small tubing

One way to bend such tubing is to get a tool made for the job. One I use is simply a stout spring the inside diameter of which is about the same as the outside diameter of the tubing; just put the tube inside the spring and bend away. Once bent like you desire, simply remove the tubing from the spring. I believe that Tower sells sets of these tools for different size tubing. Another way is to put a piece of cable in the tube and then bend it; when bent properly pull out the cable.
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Old 03-13-2006, 05:53 PM
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Default RE: Bending small tubing

ORIGINAL: touch and go
I believe that Tower sells sets of these tools for different size tubing.
You mean these things? http://www2.towerhobbies.com/cgi-bin...?&I=LXR791&P=7

I've got a set, they work pretty well.
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Old 03-13-2006, 06:06 PM
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Default RE: Bending small tubing

Or do you mean these Dubro benders?

http://www2.towerhobbies.com/cgi-bin...?&I=LXE228&P=7

Enjoy,

Jim
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Old 03-13-2006, 07:16 PM
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Default RE: Bending small tubing

right on. I figured something had to exist Hopfully no more pin holes in my fuel line from dork marks[:'(]
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Old 03-13-2006, 09:26 PM
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Default RE: Bending small tubing

If you are not already doiong it, you can anneal the tubing to make in soft and easier to bend. Heat it orange with a propane torch then immediately quench in water. In this state it can be bent with your fingers.
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Old 03-13-2006, 09:51 PM
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Default RE: Bending small tubing

Bend carefully or your tubing will develop a kink that cannot be removed.

Enjoy,

Jim
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Old 03-13-2006, 09:54 PM
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Default RE: Bending small tubing

R8893, after you anneal and bend the copper tubing must you harden it again?

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Old 03-13-2006, 10:28 PM
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Default RE: Bending small tubing

Not unless you want to.
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Old 03-13-2006, 11:10 PM
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Default RE: Bending small tubing

Go to http://members.aol.com/harryhig/Tools1.htm and see the Biso Tubing Bender. I usually insert a length of nylon string trimmer line into the tube to add some internal support.
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Old 03-14-2006, 12:18 AM
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Default RE: Bending small tubing

DuBro also has a tubing bender for 1/8" brass tubing that seems to work real well. In fact, on the few times I've used it since I bought one, it seems to do a smoother job than the spring benders I've had since my college days.
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Old 03-14-2006, 07:02 AM
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Default RE: Bending small tubing

Surprised that no one suggested using soft tubing for the vent line. Half the problem goes away without any effort.

In a pinch I have used electrical wire inside of brass tubing to prevent collapse. My fuel feed line is always straight.

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Old 03-15-2006, 11:58 PM
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Default RE: Bending small tubing

last idea and its guarantied . fill tubing with fine grain sand and seal both ends then bend it on a screw the angle and tight a turn as u need slowly.
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Old 03-16-2006, 09:12 PM
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Default RE: Bending small tubing

tried annealing it just for S+G's and it worked very well. It's been 10 yrs since high school metal shop. Just curious how to re harden it. is it just heat it up and cool it real fast in water, I thinking that is what makes it brittle, or were hardening powders involved. either way it seems strong enough to hold fuel. Though this dubro bender make this pointless, works great, but we got nothing but time right
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Old 03-17-2006, 10:57 AM
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Default RE: Bending small tubing

The fuel tubing is softened (annealed) by heating and quenching.

To harden the brass, it must be work hardened.

K&S sells copper tubing also but it too is rather hard.
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Old 03-18-2006, 09:37 PM
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Default RE: Bending small tubing

Thanks everyone for all the great posts, I've decided to buy the DuBro tube bender. I already have the spring type of tube benders, but I don't like them.
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