I need a tube mandrel bent. 1.25 OD 0.095 Wall

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[Casey L]

Hey Everyone,

I need to get 10 foot section of 1.25 OD x 0.095 Wall DOM tubing bent to my specifications. The main hoop must be a continuous high quality bend. A first attempt at using an Oxy torch has failed, I need to have the hoop bent on a mandrel bender.



Does anyone here have the ability or would like to help me out. It is for the UMass Lowell Formula SAE Racecar. The main hoop radius can be plus or minus 2 inches or so. I also have a pervious attempt at the roll hoop that I can bring with me to show you what the bend should look like.

We are willing to pay for any services. If you would like to sponsor us with your time all money is tax deductable. It is not in our budget to buy a JD^2 bender at the moment but we may be able to buy the die if that is required.

Thanks!

[Mitch]

this should go in the wanted section.

Also, I would like to see pics of the build of this car if/when they are "declassified".

[Casey L]

More Information At
http://fsae.antilag.org/forum/index.php

And Here are Images of the old Roll Hoop that will fail tech inspection


And if mod's want to move this topic please do, I didn't know what forum to post it in.

[Mitch]

thanks Casey, thats pretty cool looking, what is the top speed of that?

[Casey L]

I don't know yet, it has not driven yet!  It is still in a prototype status. We redesigned the torsen differential and mounting system and we have to chop the frame up to fix the roll hoop.

But realistically they top out at about 90MPH. It is a 600cc GSX-R Motor with a 25mm intake restrictor.

[BiGdAdDeE]

Bay State can do it......call Bob down there.  He bent tube for me before to my specs and I am sure he can help you out!!

[Casey L]

I have called Bay State the last couple of days, I have not been able to get a hold of Bob. Know if he is in the shop this week?

[jps4jeep]

Baystate does not have a mandrel bender.

I have a friend that has one, I will PM you his info

[jon]

Baystate does not have a mandrel bender.

I have a friend that has one, I will PM you his info

Unless something has changed recently, Bob definately has a mandrel bender.

[jps4jeep]

As far as I know Bob has a tube bender, JD2 I believe, not a mandrel bender. a mandrel bender would use a flexible mandrel placed inside the tube/pipe, a pressure die and wiper die to keep the equal diameter then entire length of a bend. Bob's tube bender does not have that capability as far as I know. If I am wrong, then I am wrong.

[Switch]

what about an exhaust shop?  I don't know if they could do something that thick, but it's worth a shot.

[HEYzipupyourfly]

casey when do you need this done by? my bender will do that but you have to get a little creative. I have a few 1.5" dies. if you want some weekend stop up and we can see if it can be done. I dont have any crazy compass' or protractors etc to measure exact degrees though.
let me know.

[jon]

As far as I know Bob has a tube bender, JD2 I believe, not a mandrel bender. a mandrel bender would use a flexible mandrel placed inside the tube/pipe, a pressure die and wiper die to keep the equal diameter then entire length of a bend. Bob's tube bender does not have that capability as far as I know. If I am wrong, then I am wrong.

There are a variety of definitions for Mandrel Bender.  Yours is correct, but most of the world considers a JD2 style bender a "mandrel" bender as opposed to a "shoe" bender like in harbor freight.  As the tubing is drawn over the die instead of forcibly bent. 

Very few places have a true mandrel bender(per your definition), and those that do are usually production houses.  Most that I have seen don't use a flexible mandrel, but actually use a steel ball attached to a long rod that is held inside the tube. You are more likely to see a NC tubing bender at an exhuast shop or the like.

I am quite familiar with Formula SAE and know a few of the people writing the rules.  They are using the term mandrel bender to differentiate between the "kink-o-matic" shoe style bender.  There was an issue with cages being built with the harbor freight tools or the "Torch and twist" method.  They had kinks or locally anealed areas and were deforming badly when a rollover occurred.  They changed the cage rules at that time.

The JD2 or pro-tools bender everybody has should be fine for his need.

[jps4jeep]

well is considering things is acceptable, fine

[Ian]

well is considering things is acceptable, fine

a couple beers at lunch?