Roll cage tubing ????

Posted By: mac56

Roll cage tubing ???? - 11/12/14 01:18 AM

How do they check the thickness and material for a race car cage? We have 1 pulling club in Quebec that is going to start checking cages. There are to option for mild steel and chromoly. I believe they are going to use a sonic checker. Can they determine material this way or just thickness?
Thanks

Posted By: sg66mopar

Re: Roll cage tubing ???? - 11/12/14 01:47 AM

Just thickness with the sonic tester. They do have ways (usually chemical) to check the type of steel.

If it's like our local NHRA guys, they took my word for it.

Chromoly is stenciled from the steel mill so if it's not painted or coated they can see it's Moly.

Posted By: mac56

Re: Roll cage tubing ???? - 11/12/14 02:05 AM

Ok thanks. In our sport near all chassis are painted due to the enviorment we pull in.

Posted By: sg66mopar

Re: Roll cage tubing ???? - 11/12/14 02:38 AM

Generally speaking the moly tubing is available in different thicknesses than you would see with mild steel. If the chassis inspector is familiar with the common mild and moly wall thicknesses they'll probably know what they're looking at.

Posted By: 68-scatpack-rt

Re: Roll cage tubing ???? - 11/12/14 02:42 AM

I believe the common thickness for chromoly is: .083 and .120 is common for mild steel.
Common for roll bar tubing, that is.

Posted By: mac56

Re: Roll cage tubing ???? - 11/12/14 02:51 AM

The spec is .095 1.75 chromoly which I can buy in mild steel. Even though that is the spec I havent found that in chromoly.

Posted By: CMcAllister

Re: Roll cage tubing ???? - 11/12/14 03:01 AM

.095 x 1.75 CM is pretty stout stuff. I haven't fooled with any but I expect it would take a decent bender to bend that. AED in Indianapolis has tubing that size. No idea what it would take to get it to you. I hope your guys know how to calibrate the sonic testers correctly. Apparently when they started using them to check bars here, they didn't. Created a lot of problems later on when they learned how to do it right. I know of more than one car that had passed a couple of times and then all of a sudden wasn't legal.

Posted By: sg66mopar

Re: Roll cage tubing ???? - 11/12/14 03:15 AM

I bought some moly from onlinemetals.com and I believe they have the .095 x 1.75 tubing.

Posted By: mac56

Re: Roll cage tubing ???? - 11/12/14 03:35 AM

Im not far from the border so I just come across to pick stuff up so it isnt bad getting anything from the lower 48

Posted By: W.I.N. Racing

Re: Roll cage tubing ???? - 11/12/14 06:06 AM

You might want to look at one of these of they are going to sonic them they might also see if the meet some type of spec ???????????
Spec #/_______Tractors/__________________________Current Revision Date/__Price ($US)
47.1/ Driver Roll Cage for Use on 7,000 To 10,000 lbs. Tractors/ June 26, 1998/ 38.00
47.2/ Driver Roll Cage for Use on Tractors, Less Than 6,000 lbs./ June 26, 1998/ 38.00
47.3/ Driver Roll Cage for Use on �Mini-Rod� Tractors, Less Than 2,000 lbs./ June 26, 1998/ 38.00

Posted By: astjp2

Re: Roll cage tubing ???? - 11/12/14 08:23 AM

Also be on the lookout for fake CM, there was a bunch imported from China that did not meet spec even though it was labeled 4130 normalized...Tim

Posted By: calrobb2000

Re: Roll cage tubing ???? - 11/12/14 01:08 PM

hi
how do you know if it is fake 4130 ??

thank you !

Posted By: mac56

Re: Roll cage tubing ???? - 11/12/14 01:26 PM

Quote:

You might want to look at one of these of they are going to sonic them they might also see if the meet some type of spec ???????????
Spec #/_______Tractors/__________________________Current Revision Date/__Price ($US)
47.1/ Driver Roll Cage for Use on 7,000 To 10,000 lbs. Tractors/ June 26, 1998/ 38.00
47.2/ Driver Roll Cage for Use on Tractors, Less Than 6,000 lbs./ June 26, 1998/ 38.00
47.3/ Driver Roll Cage for Use on �Mini-Rod� Tractors, Less Than 2,000 lbs./ June 26, 1998/ 38.00

Bill that is exactly why we are changing the cage on this tractor. It has to meet the SFI 47.3 spec which is 1.75 .095 chromoly or 1.875 .083 mild which is over kill for the class because this spec is for ntpa 2000 hp minis. the club requesting this does not allow that class of tractor. It is like putting 8.90 cage in a twelve second car. The 2 choices seem out of wack to me be I haven't looked up how the 2 choices compare to each other.

Posted By: jcc

Re: Roll cage tubing ???? - 11/12/14 05:45 PM

Quote:

hi
how do you know if it is fake 4130 ??

thank you !

It's in Chinese?

Or its wrapped like chopsticks?

Posted By: CMcAllister

Re: Roll cage tubing ???? - 11/12/14 09:54 PM

Quote:

hi
how do you know if it is fake 4130 ??

thank you !

Stay away from the Chinese stuff. You get what you pay for. Always ask where is it made.

Posted By: W.I.N. Racing

Re: Roll cage tubing ???? - 11/13/14 01:40 AM

Quote:

Quote:

You might want to look at one of these of they are going to sonic them they might also see if the meet some type of spec ???????????
Spec #/_______Tractors/__________________________Current Revision Date/__Price ($US)
47.1/ Driver Roll Cage for Use on 7,000 To 10,000 lbs. Tractors/ June 26, 1998/ 38.00
47.2/ Driver Roll Cage for Use on Tractors, Less Than 6,000 lbs./ June 26, 1998/ 38.00
47.3/ Driver Roll Cage for Use on �Mini-Rod� Tractors, Less Than 2,000 lbs./ June 26, 1998/ 38.00

Bill that is exactly why we are changing the cage on this tractor. It has to meet the SFI 47.3 spec which is 1.75 .095 chromoly or 1.875 .083 mild which is over kill for the class because this spec is for ntpa 2000 hp minis. the club requesting this does not allow that class of tractor. It is like putting 8.90 cage in a twelve second car. The 2 choices seem out of wack to me be I haven't looked up how the 2 choices compare to each other.

Problem is you need to buy both cert books to get the details...but cheaper in the long run vs wasting time and tube

Posted By: mac56

Re: Roll cage tubing ???? - 11/13/14 02:01 AM

I have a copy of the section Bill. A friend purchased it a while back.

Posted By: CMcAllister

Re: Roll cage tubing ???? - 11/13/14 02:32 AM

Quote:

Quote:

You might want to look at one of these of they are going to sonic them they might also see if the meet some type of spec ???????????
Spec #/_______Tractors/__________________________Current Revision Date/__Price ($US)
47.1/ Driver Roll Cage for Use on 7,000 To 10,000 lbs. Tractors/ June 26, 1998/ 38.00
47.2/ Driver Roll Cage for Use on Tractors, Less Than 6,000 lbs./ June 26, 1998/ 38.00
47.3/ Driver Roll Cage for Use on �Mini-Rod� Tractors, Less Than 2,000 lbs./ June 26, 1998/ 38.00

Bill that is exactly why we are changing the cage on this tractor. It has to meet the SFI 47.3 spec which is 1.75 .095 chromoly or 1.875 .083 mild which is over kill for the class because this spec is for ntpa 2000 hp minis. the club requesting this does not allow that class of tractor. It is like putting 8.90 cage in a twelve second car. The 2 choices seem out of wack to me be I haven't looked up how the 2 choices compare to each other.

1.75 is as common as it gets. Any chassis shop will have dies to bend that as long as the machine will do it. I have no idea where you would get 1.875 bent. Not a chassis shop that I know of.

Posted By: mac56

Re: Roll cage tubing ???? - 11/13/14 02:45 AM

What my buddy did was went with 2 inch .083 wall and that satisfied the sfi spec.

Posted By: astjp2

Re: Roll cage tubing ???? - 11/13/14 02:52 AM

Ask for made in the USA certification paperwork, any reputable supplier will provide it for a small fee, worth the effort.

http://aircraftproducts.wicksaircraft.co...amp;pagesize=50

certified good chit!

Posted By: Bigbeep

Re: Roll cage tubing ???? - 11/13/14 05:39 AM

Just a piece of advice. Keep a small piece of tubing that you use to build the cage with. When you have the inspection done take it with you just in case there are any issues with the sonic test. If so, have them check your small piece to check against the tester. Then use a ball end micrometer to prove the thickness is correct. Then they will have to set up the tester the correct way or get someone who knows how to use it the correct way.

Beep