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  #1 (permalink)  
Old 05-21-2010, 05:19 AM
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how to .. bending pipe like so..

.

.. shown in picture (highlighted). This style I really like.... it looks like 1 piece bent from one axle block to another, how do you guys pull of such tight bends without crimping?

I made myself a bender, works great only I need sand, I tried very fine sand from a sandblaster but it just didnt work, maybe I didnt have the pipe full all the way not sure, with sand like that its hard to tell... so what sand is best used for bending pipe?
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Old 05-21-2010, 05:25 AM
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You need a rotary draw tube bender.
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Old 05-21-2010, 05:39 AM
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how small does the die have to be for that tight radius, everyting ive seen has a huge one.. the one I guilt is the smallest I could find, I think it might work if I could only figure out the whole sand process, which seems simple.
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Old 05-21-2010, 05:40 AM
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I hope you are talking about using tube not "pipe". Pipe is not suitable for motorcycle frames. But... I used 1.5" x .120" DOM Tube and a bender to form 2 pieces (90 degrees 4.5" radius) and joined the pieces with a sleeve.





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Old 05-21-2010, 05:47 AM
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This is what I use. You buy different dies with different radius depending on how tight of a bend you need.

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Old 05-21-2010, 06:01 AM
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yeah I just through pipe out there, its BOM 1.25 tubing im using... so yours is a two piece with a sleeve welded in the middle.. that will make things easier.. now just gotta figure out my bender.. what I made was a simple cheap bender like this ..



its not a mandrel bender but using sand like old school shoud do the trick no?
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Old 05-21-2010, 06:07 AM
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Quote:
Originally Posted by Doba View Post
yeah I just through pipe out there, its BOM 1.25 tubing im using... so yours is a two piece with a sleeve welded in the middle.. that will make things easier.. now just gotta figure out my bender.. what I made was a simple cheap bender like this ..



its not a mandrel bender but using sand like old school shoud do the trick no?
That won't do it. You can't avoid buying the proper bender.
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Old 05-21-2010, 06:53 AM
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oh man.. looks like I have to get my friends mandrel bender again, I used it and modified it for 1" pipe on my previous build, now going with 1.25" I'll have to modify it again.. was hoping to avoid that.
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Old 05-21-2010, 07:06 AM
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Quote:
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........ so yours is a two piece with a sleeve welded in the middle.. that will make things easier..


Doing them in 2 pieces made it much easier to get them square and parallel . I built a low $ jig out of pressure treated lumber to keep them square when I welded them together, it also made it easier to get 2 hoops exactly a like.

Donít rag on my jig too bad, Hey it worked good, sometime you got to use what you got. When welding them up It gave new meaning to "thatís a smoke'n jig you got there"


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Old 05-21-2010, 07:25 AM
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The bends shown in your example are probably bent on a 3" CLR die. A rotary draw bender is not a mandrel bender although a mandrel bender is usually rotary draw. A mandrel bend is for flow applications where you need a consistent inside diameter to the tube. A mandrel bender is not advisable for structural elements because it will significantly reduce the wall thickness on the outside radius of the bend. I too support bending two pieces and sleeving/slugging them together. Makes life much simpler.

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Old 05-21-2010, 07:47 AM
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Quote:
Originally Posted by Scum View Post
Doing them in 2 pieces made it much easier to get them square and parallel . I built a low $ jig out of pressure treated lumber to keep them square when I welded them together, it also made it easier to get 2 hoops exactly a like.

Donít rag on my jig too bad, Hey it worked good, sometime you got to use what you got. When welding them up It gave new meaning to "thatís a smoke'n jig you got there"


HAHA thats awesome, smiking jig LOL

either way you did an awesome job, If only I can make mine work out as good as you..

thanks for all the advice, its all up the bender now

Does anyone sell already bend tubing like that? then all id have to do is measure and sleeve it.. would be easier than reworking that bender or buying a new one for such a small job.
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Old 05-21-2010, 01:46 PM
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Hey .... that's my buddy Mike .... I use to work for him. Those "hoops" are 1 piece & he bends them himself. He does use a tube bender. He's got tons of dies so it's not an issue ... for him. That frame is one he did for Hank Young. I think it was the "Cold Iron" bike.

There are many thoughts on this subject .... one piece .... two with a inner sleeve .... both are good.

Do NOT just but weld two together tough .... you will loose some of the strength to the hoop.

Just my thoughts ....

PACO
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Old 05-21-2010, 02:19 PM
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Common knowledge tells me NOT to but weld those together, right away if done in two there must be some sort of sleeve... Hey PACO do you still have contact with your buddy? I wonder if he would bend me a couple if I were to supply him some dimensions.. shouldnt take long and Ill just cut and trim to my fitting. shipping something like that shouldnt be a problem... maybe hes interested.
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Old 05-21-2010, 03:01 PM
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I can hook you up. check your PM's

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Old 05-22-2010, 06:11 AM
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Thanks Bob, much appreciated you got PM

Thanks for the info as well PACO, but if Bob says he can do it thats fine, I mean its not a big job, I dont have to compare prices. Thanks guys
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