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  #31 (permalink)  
Old 01-02-2009, 11:14 AM
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Quote:
Originally Posted by powerrodsmike
IIRC, the minimum centerline bend radius that I could get out of my homemade dies was about 3.5 times the OD of the tube. Anything less and they'd kink.

Later, mikey

It all depends on the wall thickness of your tube. The thicker the tube, the tighter you can bend.

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  #32 (permalink)  
Old 01-02-2009, 11:45 AM
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Quote:
Originally Posted by BAILEIGH
It all depends on the wall thickness of your tube. The thicker the tube, the tighter you can bend.
Is there a chart or calculation that can tell you what the minimum bend that can be attained using a given wall thickness? Using a rotary draw type bender, and not a mandrel bender?

Later, mikey
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  #33 (permalink)  
Old 01-02-2009, 12:06 PM
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Quote:
Originally Posted by powerrodsmike
Is there a chart or calculation that can tell you what the minimum bend that can be attained using a given wall thickness? Using a rotary draw type bender, and not a mandrel bender?

Later, mikey
Not really......minimum wall thickness vs.. CLR will all depend on what style and what quality of tube bender you have.

Here is an example:

Some rotary draw benders provide little or no outside support on the tube as it is being bent. So the bend quality will be different than a bender that has a nice counter bend die assembly that forces the material into the die set. I can only speak for our benders, but I'll try to answer your question.

What are you building? What size of tube are you trying to bend? What is the material?
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Old 01-02-2009, 01:29 PM
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It was more of a general question, I usually experiment with stuff and learn as I go.
As I said in a previous post, I have a hossfeld # 2, and that does tubing bends much like a rotary bender, if you have the 180 degree die set for a given tube size. The die set comes with a die, and matching back block and draw block, which holds the tube tight to the die while bending, supports the outside of the tube, and is designed to create tension on the tube while it is being bent.

I know their technology is good , as some of the listed bends for various die sets are pretty tight. They list the material, OD and minimum wall thickness and a bend centerline radius for all of the dies they sell.
For example, their 28643 die set will bend 1 5/8 10gauge DOM or ERW 1020 tubing in a 180* with a 3 1/4" CLR.


Later, mikey
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Old 01-02-2009, 06:24 PM
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Hello Shane
Welcome to Hotrodders.

What would you suggest for the 4 link bars on an coil over sprung(front and rear) rpu in the neighborhood of 1500-1800 lbs.
Shane
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  #36 (permalink)  
Old 01-03-2009, 06:50 AM
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Quote:
Originally Posted by BAILEIGH
That is an odd application. What are you building?

Are you sure you are measuring your desired CLR correctly?
We build a lot of hairpins for the front and rear suspension. We have a good customer that is having trouble with the 7/8"-.156 wall tube hairpin bending in higher HP applications. We make a lot of the 1" stuff.
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Old 01-05-2009, 07:47 AM
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Quote:
Originally Posted by Chevrolet4x4s
Hello Shane
Welcome to Hotrodders.

What would you suggest for the 4 link bars on an coil over sprung(front and rear) rpu in the neighborhood of 1500-1800 lbs.
Shane
Not sure on that one.
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  #38 (permalink)  
Old 01-06-2009, 05:19 AM
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Quote:
Originally Posted by scrimshaw
Pipe is a vessel for carrying fluids. It is made to an INSIDE measurement and this measurement should remain consistent regardless of the outside measurement.
Incorrect. Piping meant for fluid transfer has a nominal diameter and is manufactured to a standard outside diameter. The wall thickness (schedule) varies which means that the inside diameter changes. For example, all 2" pipe has an outside diameter of 2 3/8", which is the nominal diameter. The wall thickness varies from .154" for sch. 40, to .218" for sch. 80. There are also lighter and heavier thicknesses available.
Tubing also has a standard outside diameter, however it is the actual diameter. 2" tubing is 2" o.d., and also comes in varying wall thicknesses.
As for strength, a common carbon steel piping grade is ASTM A53 Gr. B which is seamless and has a tensile strength of 60,000 psi. A common tubing grade as used for roll bars and cages is 4130 Chrome Moly steel with a tensile strength of between 81,200 and 97,200 psi.
Just wanted to clear that up....

Steve
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Old 01-06-2009, 08:59 AM
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Quote:
Originally Posted by steve392
Incorrect. Piping meant for fluid transfer has a nominal diameter and is manufactured to a standard outside diameter. The wall thickness (schedule) varies which means that the inside diameter changes. For example, all 2" pipe has an outside diameter of 2 3/8", which is the nominal diameter. The wall thickness varies from .154" for sch. 40, to .218" for sch. 80. There are also lighter and heavier thicknesses available.
Tubing also has a standard outside diameter, however it is the actual diameter. 2" tubing is 2" o.d., and also comes in varying wall thicknesses.
As for strength, a common carbon steel piping grade is ASTM A53 Gr. B which is seamless and has a tensile strength of 60,000 psi. A common tubing grade as used for roll bars and cages is 4130 Chrome Moly steel with a tensile strength of between 81,200 and 97,200 psi.
Just wanted to clear that up....

Steve
Hi Steve

I feel like we are arguing semantics and while I can't fault you for what you wrote I still think what I wrote was correct. Yes - within a specified size the OD does not change but the specified size doesn't really correspond to the OD it has to do with the ID at a certain wall thickness.

For example a 1 inch pipe is made to carry an approx. amount of fluids so it's inside diameter is sized for that amount. Sch. 40 has an ID of 1.049" and sch80 has ID of 0.957 both very close to 1" but it's OD is 1.315.

A 10 inch pipe has an ID of 10.020 (sch 80) and 9.750 (sch40) so the ID is still close to the specified pipe size whereas the OD is 10.75" - much bigger than 10 inches.

The specified size originally was directed at ID rather than the OD at these wall thicknesses because pipe is manufactured for fluid flow, although like many codes, original guidelines have become blurred with new technologies, materials and manufacturing methods.
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Old 01-06-2009, 09:56 AM
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Also meant to say that the ID of a pipe remains consistent throughout ie at joints the pipe gets bigger or it is flanged and bolted so there is minimum interuption to fluid flow whereas a tube is usually sleeved on the inside as we don't care about ID on a tube.

Sorry Baileigh for interupting your thread just wanted to clarify my post.
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  #41 (permalink)  
Old 01-27-2009, 11:13 AM
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Anyone have any other question about tube rolling or bending?
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