I know this has probably been covered and yes I have done the search. But I can't find anything relevant as the board keeps locking up and I have a sloooow fawking dial up connection.

Form ARCA rule book- Round steel seamless tubing with a minimum outside diameter measurement of 1.5" and a minimum wall thickness of .120 is compulsory for the basic roll cage.

Does seamless mean it has to be DOM?? My current cage is made of HREW 2"x.120. How have the tech inspectors been enforcing this. I have heard of some guys running sewer pipe and getting away with it.

I am asking because we are ordering the tubing to do my brothers cage and if I need to redo mine I might as well order it now and get us both a better price.

No, it does not need to be DOM. It must be .120 wall minimum, however....

As far as I know HREW is OK, some one should be able to confirm. I think they are refering to a seam on the outside of the tube.

Joe

HREW should be fine. But i would wait to build the cage, or if you have to build it now, make it so it can easily be changed later. I heard that RCAA is gonna be changing their cage/chassis requirements next year, big-time. Kinda sux cause i just got a new cage... ohh well-

Just so ya know

DOM is not seamless....the seam is nicely finished as it is Drawn Over the Mandrel...but it still has a seam.

True seamless tubing or pipe is a specialty product used for high pressure gas / liguid conveyance - not for building rigs.

My guess is they didn't mean to say "seamless tubing"

Originally posted by elf_cruiser
HREW should be fine. But i would wait to build the cage, or if you have to build it now, make it so it can easily be changed later. I heard that RCAA is gonna be changing their cage/chassis requirements next year, big-time. Kinda sux cause i just got a new cage... ohh well-

when will we know what the new rules are???

I suppose sometime before the 2003 season starts. Prolly this winter, or next spring???

I know Mike has the new requirements. But I don't have them.

Originally posted by BillaVista
Just so ya know

DOM is not seamless....the seam is nicely finished as it is Drawn Over the Mandrel...but it still has a seam.

True seamless tubing or pipe is a specialty product used for high pressure gas / liguid conveyance - not for building rigs.

My guess is they didn't mean to say "seamless tubing"
1018 is seamless tubing . They take a solid rod and pierce it with a hot poker. It's about half way in-between HREW and DOM in price

So your running HREW... you painted your cage right? How are they going to know there was a seam there?

1018 is seamless tubing .

Well, to be perfectly correct - the designation 1018 has nothing to do with the process by which the product is formed. 1018 is a type of steel - in this case a low carbon steel with a relatively higher content of, I think it's manganese, not totally sure. Just specifying 1018 does not mean seamless tubing...same way saying 1020 does not mean DOM. process and type of steel- 2 different things. Now, it may be that seamless tubing is very commonly made from 1018, the way DOM is commonly made from 1020 - but we're talking about 2 different things, strictly speaking. No reason you can;t make bolts, fan blades, whatever out of 1018 or 1020 or whatever the heck you like.

Just to be anal about it:flipoff2:

Originally posted by BillaVista


Just to be anal about it:flipoff2:

Just what I was expecting:flipoff2:

Here is what my steel supplier has for 1018 seamless


1018 COLD DRAWN AND HOT FINISHED SEAMLESS TUBE
--------------------------------------------------------------------------------
1018 is normally used in the manufacturing of cold drawn and hot finished seamless tube. The production of seamless tube is generally made by piercing a hot rolled bar. Hot finished is generally furnished in the unannealed condition, whereas cold drawn seamless is supplied in the unannealed or S/R annealed conditions, depending on the size.
American Specifications: ASTM A519

British Specifications: 070 M 20, 080 A 15

Applications: Axles, shafts, gears, bearings

Size Range: 1/8" - 24" (3 mm - 610 mm) OD; .0218" - 3.00" (.6 mm - 76 mm) wall

Hey Lance, is there any chance we could get ya to post the new changes ?? If they make DOM required , then I might as well buy enough for both rig$$$$$$$. FAWK

Originally posted by Lance
I know Mike has the new requirements. But I don't have them.

come on, it's fun to share.

I'll see what I can do. But I know for SURE that DOM is not required, and that you must use .120 wall (or greater).

Will they make exceptions for using chromoly? .080 wall is around the same strength as .120 regular but it weighs a lot less. They will let you run it in NHRA and if its good enough to hit a wall at 300 mph it should be good enough for crawling