|04-21-2011 09:25 AM|
Look at the date of this thread, you are 4 years too late!
|04-21-2011 07:29 AM|
You guys seem to be putting the guy down. I'm sure he knows he'll have to pull the mandrel through while bending the pipe.
Not only that I'd love to be able to do this myself at my house.
|04-10-2007 12:08 AM|
That is a mandrel.
The JD2bender leaves no kink,, The dies as sold by JD are sized so it won't kink reasonably thin material.
Using a mandrel in that JD bender is a waste unless you get a smaller radius die to take advantage of the mandrel. Then you need to set up a frame on the back setion of the tube to keep the mandrel from pulling through the bend along with the material. Then it will need a way to retract the mandrel from the bent material. Real mandrel benders use a big hydraulic ram. That screws into the back end of that mandrel you pictured.
Try looking on ebay.
|04-09-2007 11:35 PM|
with the jd2 bender. wht do u think? where can i find this insert?
how bad of a kink does the jd2 bender leave?
|04-09-2007 10:38 PM|
Some info on mandrel bending.
|04-09-2007 09:40 PM|
Mandrel bending room
I was in Deytens Shipyard in Charleston SC recently. It is the old Charleston Naval Base. I was wandering around one day and came upon the old mandrel bending pipe shop. They had everything from a table top bender that made me drool to benders that where capable of 16" copper nickel pipe. I swear the mandrels were taller than me at 6'2". It was all totally unused and covered in dust. What a waste, I guess the Chinese do it cheaper.
|04-09-2007 08:30 PM|
That second bender is the JD 2 bender that I put a link to over a year ago in this thread. it is a very good bender, worth every penny . That chinese bender at the top can't even compare to the JD2.
If you don't want to spend any money,
Why don't you just pack sand inside of the tube and weld the ends up. You can get tighter bends in thinwall that way.
Homebuilt mandrel benders don't work well. You can't get the balls out after you bend the tube.. I have tried it. .
A true mandrel bender pulls the tube over the mandrel.
|04-09-2007 07:46 PM|
|123pugsy||I've got the bender on the top.Its only good for flat stock or solid round bar. It doesn't have tooling for tubes.|
|04-09-2007 06:10 PM|
what would be the difference between a bender like this:
and a bender like this:
the first bender is $80 and it comes with dies. The second bender is $300 and doesn't come with dies a degree ring or a handle.
Would the second bender to mandrel bends?
I am thinking if put a mandrel plug and ball inside the tubing it would help make some tubing that is "mandrel" bent
|04-07-2007 07:19 PM|
SOme Updated Questions
I was wondering if i could find a pipe bender or build one myself which could bend some small diameter piping. I will worry about the larger piping benders later.
How can i make a bender that will do mandrel bends? The piping i will most likely use is going to be from 1"-2" dia. with a pretty heavy wall thickness, nothing crazy but i doubt it would kink.
The material will also be steel
|02-04-2006 07:04 AM|
For something like that I would consider metal shaping the pieces..make a hammer form and strech and shrink the metal until you have the right shape..make 2 halves and weld them together for a finished tube..Only way I know in some kind of metal that is that thin..if it is on the intake side the material does not need to be all that thick..maybe even 20 gauge would do the job..
The JD2 which I have does fine for the structural stuff up to 2" like for chassis pieces..and can be used for header tubes as well..anything over 2" well that is another story..
Just look at what you need to do and give it some thought and it will come clear just what kind of technique to use..
If I were to make intake tubes for the same car over and over I may even consider fiberglass as we do use plastic these days for something like that and that may be a bit easier to do..
|02-04-2006 06:31 AM|
|oldred||The HF hydraulic outfits are "pipe" benders, there is a lot of difference between a pipe bender and a tubing bender. The tubing benders they have is for conduit and the like.|
|02-04-2006 01:40 AM|
also, the tubing size is not directly indicated, it says the dies come in X"-Y" from what i have researched these sized dies would bend anything bigger then 1 3/4"
|02-03-2006 09:05 PM|
try this link:
|02-03-2006 01:43 AM|
They make dies. There is alot of engineering data there on that site you will find useful. They make dies there that will bend 8" diameter tube in a 16" centerline radius so I'm sure that the 3 1/2 " tubing you want to bend will be a cinch. They build dies from 1' on up so you can get all of your dies there. Hope this helps, mikey
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