The Official Tube Bending Thread

heres a beauty of a homemade tube bender, and also one of his radius cutter.

http://www.youtube.com/watch?v=47QjQpqdMts

http://www.youtube.com/watch?v=uyTWmCeAJGs&feature=related

heres a good look at a radius cutter, would need to be cut deaper for a tube bender is all.

http://www.youtube.com/user/CARDAN531#p/u/26/c-G2FV67g4c

 

Nice!

 

hey guys i got a question about bending 4" SS pipe on a 5.5 CLR, does not matter what i do, (increase the pressure on my pressure die, push....) The wiper is positioned good, with no positive or negative rake, the mandrel is 4 ball brass! the wrinkles r located right at the beginning of the bend, and the rest looks fine!! i also checked the position of my clamp die, to make sure its clamping with the even pressure on the tube!! i m not sure what else to try, and dont feel like wasting money since this material is not cheap!!! if someone has any suggestions or solutions, please help!!!!! thank you!

 

What bender do you have?

 

robitec, schwarze R130-CNC-MR bender if that helps!!!!!

 

WOW!

I just checked out their website.



Now that is a bender!

Post up some pics of the bend and lets check it out.

 

hehehe, yeah its pretty big and powerful, i will post some pics tom, and hopefully someone will be able to help me! thank you in advance!!

 

here r some pics, of the bend, and again they r located right at the beginning!

 

Still having the problem?

 

Any more questions on tube bending?

 

Good stuff right here!

http://www.jalopyjournal.com/forum/showthread.php?p=6336436#post6336436

 

new to form
i just received a hossfeld 2 bender and im wondering how to bend to degrees when there isn't any degree scale on the hossfeld bender?

 

Search Ebay for angle finders

 

Sand bendng is not easy with flame heating. One time it took 5 pieces to get the bend to be within 10% of the dimension needed. We used a wood pattern and 4 oxy/ ac torches.Keeping the heat uniform was the biggest challenge.
Then we found the easy way to do it. You need to get the heat uniform throughout the pipe. The most effective way to do this is with high frequency induced current. Of course this process is not very affordable . I was lucky to know someone in the piping and boiler tube bending industry. We packed the 2" dia. w/ .120" DOM tubing with oiled sand. The placed it on a steel bending table which had holes drilled at various pitches. We installed roller pins in the table for shape need. Heated the pipe up 875 F with the current . It was orange hot. Then used the roller ram to push the pipe up against the stationary roller pins. Air cooled , followed with a water quench . The finished bend had no dimples, flat spots or kinks. And the bend dimension was dead on. My cost a couple cold cases and a bit of welding.

 

Hello HAMB members,
My first post here, looks like lots of info.
I found this site while searching for information on roll benders.
I hope to make my own as the size unit needed for the tube/pipe I wish to use is EXPENSIVE
I have access to an old commercial washer.
it is large industrial solution washer with a 200+ lb tub.
The unit has 3 motors ,air compressor w/air brake, water pump, full siemens/allen bradley control panel and a whole lots of plumbing related stuff that can be stripped off.
With the tub and front elements stripped it would start to look very similar to the 3 roll benders on the market that are capable of 4" SCH40.
This unit has gear reduction and lots of other control elements.
I am hoping to design to use existing rollers from BAILEIGH or similar.
So what do you think, am I on the right track?
I'll post pics soon.

 

Could that be caused by a worn die or rollers lead-in surface?
Hard to tell from the picture is that protruding out more than in?

 

I have a Jd square model 4 bender and I have been wanting to make a die to bend 1-5/8" od header tubing in a 3.5" radius. 5.5" radius just won't cut it. Will I be able to bend the tube with minimal distortion to 3.5" radius? And if so what wall thickness? Thanks

 

i think your going to need a mandrel bender, heres a chart that will tell what type of mandrel you need, i just watched a video of the jd 4 and if your a bright guy you could build a mandrel atachment for it.

http://www.omni-x.cz/en/c/mandrel-a...art/mandrel-and-wiper-die-selection-chart.htm

I have a Jd square model 4 bender and I have been wanting to make a die to bend 1-5/8" od header tubing in a 3.5" radius. 5.5" radius just won't cut it. Will I be able to bend the tube with minimal distortion to 3.5" radius? And if so what wall thickness? Thanks

 

The part that will be difficult is the mandrel that goes on the tube would have to attach to the follower part of a jd2 bender, so you would be limited on lengths you could bend . Does someone have pics of the homemade mandrels?

 

I dont think you could set up a JD2 with an internal mandrel easily.

 

can I bend a 1-5/8" tube in a 3.5 radius without it distorting bad with no mandrel?

 

What is the wall thickness.

 

Thats part of the question, what would you suggest? And is it even doable thick or thin? I guess 14 or 16 gauge are my options

 

No, that is way too thin to bend that tight without an internal mandrel.

 

I am in need of a hamb'r who has mastered a tube roller to make me a 13.5" X 3/4" ring for a custom steering wheel. I hate to sound cheap but I am not going to run out & bu equipment for one project so i fugured I'd ask here? If anyone can help or direct me to someone who can do it please PM me.
thanks,
Paul

 

Hi shane,

Im building my own tube bender and tube dies.

I have bending dies Sizes like in the picture (MM)
Tube 0.866 inch (22MM) CLR 5.51" (140 MM)
Tube 1.1 inch (28MM) CLR 7.87" (200MM)
Tube 1.25 inch (32MM) CLR 8.85" (225M)
Tube 1.49 inch (38MM) CLR 8.85" (225MM)

This is all done with the formula 3 to 4 times the outer tube diameter.....

I use standard mild steel tubing no fancy stuff, and a aluminium counter die (with a bit grease).

But it seems that i can't get a decent bend made with the 32mm die

you posted a reply you where saying you know everything about ube bending soooo


Hope to hear from you soon.


cheers

jeroen

 

I think you might be seeing that flattening due to your "true radius" counter bend die. Imagine if you were to bend tube over your knee. It's naturally going to want to flatten on the outside of the bend. A way to counter this effect is to have an elliptical shaped counter die to squeeze the material and not let it flatten.

See how our aluminum / bronze counter bend die is not "true radius?" Notice it is not perfectly round. It has an slight egg or elliptical shape. This helps with the flat bend problem.

Hope this helps.

 

Aha that sounds logical...

Is there a sort of formula or standard for how much elliptical shape i need, i mean 5% of the outside tube diameter for example?

I have more raw die material lying around, i think im making the next dies with a bigger CLR.

Thanks for your help.


greets

jeroen

 

Not sure of a formula or a % of an ellptical shape. (not sure I can share that info on a forum)

I'm sure any eliptical shape would be an improvement

 

I understand

I post the pictures of de new die and bend when i made them(i hope soon).

Greets