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Old 12-10-2003, 10:24 PM
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Bending Tube

Hi all,

I have been slowly building a tube chassis in and around the existing unibody structure of my vehicle.

I got my hands on a tube bender, it is a hydraulic type



The tube that i am bending is 1 1/2 inch OD with a 1/8 inch wall seamless cold drawn mild steel.

The problem that i face is that the tube keeps either creasing and folding at the bend. I tried packing the tube with sand and heating it up and the tube cracked.

Am i doing something wrong. Do i need to heat the tube real hot???

Thanks
Richard

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Old 12-10-2003, 10:29 PM
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You need a larger bender that controls the tubing better.
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Old 12-10-2003, 10:35 PM
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Do you mean like one of the swinging arm types. A larger version of the one that i have wouldn't make a difference would it???
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Old 12-10-2003, 10:39 PM
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Don't really know, but I think you need to clamp the pipe better. Also, I think a roller would bend it better. Im no expert, but it just seems to me that it would work better that way. I think your bender is made for thinner tubing.
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Old 12-10-2003, 10:48 PM
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Thanks heaps.

I might see if i can use some parts from this one to make a swinging arm type.
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Old 12-10-2003, 10:53 PM
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Maybe if you didn't try to make the bend all at once. Bend a little take it out, check it, bend a bit more. Don't try to bend the same spot. Make the bends more gradual.

Trouble with that is , it probably won't fit your body as well.

Just my 2 cents.
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Old 12-11-2003, 05:15 AM
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I have one of these tubing benders too. They are designed basically for conduit but will work for exhaust tubing and should work for what you're doing as well. What you need to do is fill the tubing with sand and tape over both ends. Then bend the tubing. The sand will keep it from kinking.

Good luck,

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Old 12-11-2003, 12:18 PM
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The bender you have is for Pipe. The shoes do not fit tubing and there is too much slop in the shoes and they don't hold the tubing tight enough to keep it from kinking. Get a bender that has shoes designed for Tubing....Big difference between tubing and pipe.........GlennK
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Old 12-11-2003, 02:58 PM
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Well i tried the sand idea and insted of the tubing folding, it just snapped.

I then tried some other tube, it was hydraulic tube, same diameter (1 1/2 inch) but with about a 5mm wall on it. It bent fine.

I then tried some mild steel seamed tubing, with a 2inch OD and a 1/8 wall. It bent fine also.

I am going to try a different type of bender today.
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Old 12-11-2003, 05:35 PM
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On the tube bender , what I do is pack whatever size pipe I am trying to bend with sand that way the sand keeps the pipe from crinkling in,. just tape the ends up and pack as much sand that you can inside the pipe. this is an oldschool method I learned from my pawpaw. then I bought a better tube bender for $2500.
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Old 12-13-2003, 08:32 AM
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Regarding the bender, if you're serious about bending a chassis or a cage, consider a protools model 105 or a jd3 or jd3 bender. Both of these models are specifically designed to bend dom or hrew tubing. (not pipe) and will do a much better job. The issue has been addresses, the pipe fits the dies differently and that is why you're having problems.

Look at lowbuck tools and places such as rockbuggy supply for great prices on those benders.

Here is an excellent page on tube bending which may help:
Bending 101 It was written by some experts in the off road world who know much more than myself.


Good luck!
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Old 08-28-2008, 01:00 AM
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Tubing bending can get complicated.
Here is what is going on.

Tubing is measured by the OD and pipe is measured by the ID and schedule#.
Pipe can be + or - .025 and tubing od is usually within .002 thousandths.

The bender you are using is not for tubing, it is for pipe.
The die does not fit the tube perfectly. It WOULD fit a pipe perfectly.
It is what is called a COMPRESSION bender. When the die is pushed up
It causes the bottom of the tube to be compressed and the outside of the tube is expanding.
There is another method that works better because the tube is dragged thru a shoe and wiper die so the compression of the bottom of the tube happens more gradually along the bend.
The best method is called a MANDREL bender where a snake of small segments like a snake is inserted into the tube and a jack screw turns and expands the "snake" inside the tube so the walls do not collapse.
The thinner the tube the more diffacult the bending. The thicker the tube the easier it gets.
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Old 08-28-2008, 12:35 PM
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Wow, talk about digging up an old post. Still relevant info though.
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Old 08-28-2008, 12:41 PM
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The internet boundries are big.
By the way that ROTH car on your avatar was made when i was about 14 years old ! Blast from the past eh? Hahahahahha
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Old 01-02-2009, 10:34 AM
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I have spoke with tons of guys who have the same problems with this ram style bender.

Roll cages and frames should be bent with a rotary draw or rotary compression bender and not a ram bender.
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