Thread: Rollcage bending

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Building a cage is not as simple as it first appears, first you will need a Tube bender not a Pipe bender, they are 2 different things, Pipe is measured ID and Tube is measured OD
Like the others said use the .134 wall tube and the correct die.
Its important to read the rule book, I've had people build their own cages and fail tech, just because it looks like a monkeys playing frame don't mean its strong.

Originally Posted by roadster32

Building a cage is not as simple as it first appears, first you will need a Tube bender not a Pipe bender, they are 2 different things, Pipe is measured ID and Tube is measured OD
Like the others said use the .134 wall tube and the correct die.
Its important to read the rule book, I've had people build their own cages and fail tech, just because it looks like a monkeys playing frame don't mean its strong.

I agree except for the .134 thats a lot of extra weight. Most circle burner rules around here say 1 1/2 .095 minimum D.O.M.
I retrack the .134 statement as I didn't see that it was for drag racing.

Pro: I see your point about making nice with your tech guy. I run at an outlaw track, no tech to speak of.

Gary: If I knew then..... but... I've got the stock now so I'll forge ahead. My brother does the serious welding. He graduated from Tulsa a while back and has been doing it for years.

Jerry: I'll give it a try. Still have some scrap to use so I won't trash good stuff. The tubing is legal, I only said cheap in comparison to full price. A friend works in a local manufacturer who deals in bulk and we got it at their price.

Thanks again to you all.

If this cage is for drag racing..............it MUST be TIG welded!!!!...........rules state no more MIG welded roll bars or cages.

Originally Posted by sunsetdart

If this cage is for drag racing..............it MUST be TIG welded!!!!...........rules state no more MIG welded roll bars or cages.

That is not true:

http://www.crankshaftcoalition.com/w...legal_Roll_Bar

Untrue ! It says if using chrome molly it must be Tiged.

Originally Posted by sunsetdart

If this cage is for drag racing..............it MUST be TIG welded!!!!...........rules state no more MIG welded roll bars or cages.

I think you will find only Moly cages have to be TIG welded, Mild steel can be either MIG or TIG.

Originally Posted by sunsetdart

If this cage is for drag racing..............it MUST be TIG welded!!!!...........rules state no more MIG welded roll bars or cages.

Originally Posted by roadster32

I think you will find only Moly cages have to be TIG welded, Mild steel can be either MIG or TIG.

Exactly...
From the NHRA rule book

Section 20 - General Regulations 20.19
4:11 ROLL CAGE
All cage structures must be designed in an attempt to protect the
driver from any angle, 360 degrees. "All 4130 chromoly tube welding
must be done by approved TIG heliarc process; mild steel tube
welding must be approved MIG wire feed or TIG heliarc process.
Welding must be free of slag and porosity. Any grinding of welds
prohibited." Plating of chassis prohibited for all cars manufactured
after Jan. 1, 2003, unless otherwise noted in Class Requirements;
painting permitted. Additionally, roll cage must be padded anywhere
the driver’s helmet may contact it while in the driving position.