Bending 4130 Tube - Chevelle Tech
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post #1 of 20 (permalink) Old Jan 27th, 20, 5:24 PM Thread Starter
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Chris
 
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Bending 4130 Tube

So I am looking at installing a 5-point rollbar in my car so that I can get down to 10.00s ET's, that said I need a rollbar. I was planning on completing the work myself. Question is what is everyone using to bend up 4130 chromoly tubing. Will a generic tube/pipe bender work with the correct dies or is there something special I am missing.


any help/comments would be appreciated, I know some on here have done it on there own for a fraction of the cost.

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post #2 of 20 (permalink) Old Jan 28th, 20, 12:22 AM
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Jason
 
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Re: Bending 4130 Tube

Quote:
Originally Posted by GoFast Beaumont View Post
So I am looking at installing a 5-point rollbar in my car so that I can get down to 10.00s ET's, that said I need a rollbar. I was planning on completing the work myself. Question is what is everyone using to bend up 4130 chromoly tubing. Will a generic tube/pipe bender work with the correct dies or is there something special I am missing.


any help/comments would be appreciated, I know some on here have done it on there own for a fraction of the cost.
This is the bender I have:

https://www.trick-tools.com/Pro-Tool...luxe105HD_5804
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post #3 of 20 (permalink) Old Jan 28th, 20, 6:11 AM
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Rob
 
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Re: Bending 4130 Tube

You'll need a bender as described above, plus the necessary die(s) which are not cheap. Although a roll bar doesn't require certification, NHRA requires TIG welding on chromoly, but tech inspectors probably wouldn't question a MIG welded roll bar.

Any reason you wouldn't go with a prefab roll bar? It would save time and money.
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post #4 of 20 (permalink) Old Jan 28th, 20, 10:21 AM Thread Starter
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Chris
 
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Re: Bending 4130 Tube

Quote:
Originally Posted by 66rat View Post
You'll need a bender as described above, plus the necessary die(s) which are not cheap. Although a roll bar doesn't require certification, NHRA requires TIG welding on chromoly, but tech inspectors probably wouldn't question a MIG welded roll bar.

Any reason you wouldn't go with a prefab roll bar? It would save time and money.


well I have a generic harbor freight bender already, i figured a person could use it. second right now is the exchange is 37%. With that said the shipping is also a killer for a oversized item.


generic roll bar, i have not really seen one fit the way i would like to see it. Building one on my own can get things placed were it is not invasive, the car is a street car.


i do have a tig welder to take on the task without problems

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post #5 of 20 (permalink) Old Jan 28th, 20, 10:51 AM
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Re: Bending 4130 Tube

The Harbor Freight bender flattens or collapses the tubing when bending. I built a shoe with sides to use with this bender. The shoe prevented the tube from collapsing. It worked. You had to use a little effort to release the tube from the shoe after bending.
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post #6 of 20 (permalink) Old Jan 28th, 20, 12:22 PM
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Gary
 
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Re: Bending 4130 Tube

It takes hydraulic machines using bending mandrels to bend roll cage tubing plus you need a little knowledge of the the math to design and bend a roll bar that fits properly. Then you need the proper fabrication and welding equipment and knowledge to install it. Just reading your post you need to bite the bullet and find a good chassis shop and farm this job out. If you really want to tackle it yourself buy a vehicle specific roll cage from someone like [email protected] that's designed to fit
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post #7 of 20 (permalink) Old Jan 28th, 20, 1:13 PM Thread Starter
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Chris
 
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Quote:
Originally Posted by 25C 70 View Post
The Harbor Freight bender flattens or collapses the tubing when bending. I built a shoe with sides to use with this bender. The shoe prevented the tube from collapsing. It worked. You had to use a little effort to release the tube from the shoe after bending.
Got any pictures you could share, that would be great.

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post #8 of 20 (permalink) Old Jan 28th, 20, 1:15 PM Thread Starter
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Chris
 
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Quote:
Originally Posted by gnicholson View Post
It takes hydraulic machines using bending mandrels to bend roll cage tubing plus you need a little knowledge of the the math to design and bend a roll bar that fits properly. Then you need the proper fabrication and welding equipment and knowledge to install it. Just reading your post you need to bite the bullet and find a good chassis shop and farm this job out. If you really want to tackle it yourself buy a vehicle specific roll cage from someone like [email protected] that's designed to fit
Challenge accepted 😉

Pretty sure I can handle this one. Really nothing complicated about it. Just not sure about my equipment for bending the materials.
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post #9 of 20 (permalink) Old Jan 28th, 20, 1:44 PM
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Gary
 
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Re: Bending 4130 Tube

You cant bend the tubing without the proper equipment and even the least expensive ones are expensive. If you want to make your own cage and install it use half inch conduit to bend patterns and have a shop bend the tubing to match.
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post #10 of 20 (permalink) Old Jan 28th, 20, 3:13 PM
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Rick
 
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Re: Bending 4130 Tube

Quote:
Originally Posted by GoFast Beaumont View Post
Challenge accepted 😉

Pretty sure I can handle this one. Really nothing complicated about it. Just not sure about my equipment for bending the materials.
A harbor freight bender simply cannot bend 4130 tubing without deforming the tubing. It requires a bender with dies.


On mild steel you might be able to make a slight curve with that style benders, but a 90'ish bend for a roll cage is simply not possible.


As mentioned, 4130 requires TIG welding to be NHRA legal.

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post #11 of 20 (permalink) Old Jan 28th, 20, 7:28 PM
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Re: Bending 4130 Tube

just get a length of 1 5/8 by .083 moly and give it a try with the closest die to that size you have, then you will know-if it doesn't work try the sand tactic
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post #12 of 20 (permalink) Old Jan 28th, 20, 8:37 PM
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Re: Bending 4130 Tube

Chis, I will have to see if my buddy that I built it for still has it. I built it back in the late 90's. We bent a lot of 1 1/2 dom tubing with it. Later on I used a Greenlee computerized bender, possibly a 854, using the thin wall die, this bender was at my place of employment and now resides in my garage - computer on it took a dump. A few of my fiends use the manual benders to build dirt track cars. But they are not bending chrome moly either. I know there is a lot of strength difference between dom and seam weld, don,t know about chrome moly
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post #13 of 20 (permalink) Old Jan 29th, 20, 12:39 AM
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Chris
 
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Re: Bending 4130 Tube

If you choose to use a company locally, I'd talk to Grant Reierson out of Edmonton. I think his shop's name is Capitol Gear Motorsports. He drives a 66 Nova that I've seen in person. It has a very nicely done chromoly cage that tucks up nice and tight.


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post #14 of 20 (permalink) Old Jan 29th, 20, 9:10 AM
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Re: Bending 4130 Tube

Bending tubing takes practice. You can shop around for something like a manual Greenlee bender or even the one shown above but you will need a job-specific tubing bender for what you want to do. I would buy some inexpensive thinner wall mild steel tubing and make lots of practice bends before you start bending moly. You're going to make mistakes and it's really hard to straighten tubing out once you bend it. You're also going to want to get a tubing notcher. Here again, buy a decent one. The cheap ones are nothing but a PITA to use and you spend as much time cleaning up the cut as you would doing it by hand.
JMO.

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post #15 of 20 (permalink) Old Jan 29th, 20, 9:12 AM
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Re: Bending 4130 Tube

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Originally Posted by DragRacer View Post
How do you like that bender? I was eyeing one of those a while back when I had my car apart. Decided to put it back together this time without a bar but there will come a day.

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