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  #16 (permalink)  
Old 04-09-2007, 06:10 PM
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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

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  #17 (permalink)  
Old 04-09-2007, 07:46 PM
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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.
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Old 04-09-2007, 08:30 PM
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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.


Later, mikey
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Old 04-09-2007, 09:40 PM
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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.
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Old 04-09-2007, 10:38 PM
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Some info on mandrel bending.

http://images.google.com/imgres?imgu...%3Den%26sa%3DG
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Old 04-09-2007, 11:35 PM
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Quote:
Originally Posted by powerrodsmike
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.


Later, mikey
my plan ws to use something like this:

with the jd2 bender. wht do u think? where can i find this insert?

how bad of a kink does the jd2 bender leave?
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Old 04-10-2007, 12:08 AM
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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.

later, mikey
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Old 04-21-2011, 07:29 AM
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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.
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Old 04-21-2011, 09:25 AM
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Quote:
Originally Posted by homernukem
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.

Look at the date of this thread, you are 4 years too late!
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