What Do you think of this cage?

[Rx3]

Ok Brian I think you are going about this all wrong. If you are serious about taking your car to the track, the first thing you need to do is check with the sanctioning body you plan to be competing with and find out EXACTLY what kind of cage is allowed or mandatory according to the rules. Verify the construction clauses for the cage. Bolts may not be an option. Then go look for a cage. Just slapping in some 350 dollar cage is going to be a waste of money if you find out when you goto the track that you can’t use it because it doesn’t meet (safety) spec.

If you already did all this, then carry on.

What kind of track racing were you planning on exactly anyhow?

[Zer0DazE]

@krazyjon

first of all dont hate on the hot ghost flames. i liked um

subscribed

thats because you have a pink i-pod.

[Oroc]

@JnJSpdShop

If you want I could put you in contact with someone who does certified cages at a very resonable price in DOM or mild steel

I will second this guy :tup: one of the best in the area attention to detail is phenominal

[dozr]

If you dont mind dropping the car off in detroit, I know someone who might do it… but hes not cheap. But then again, is anything that comes from Prodrive cheap?

[turbo_ls1_ss]

@Oroc

I will second this guy :tup: one of the best in the area attention to detail is phenominal

vitez?

[system]

@turbo ls1 ss

vitez?

I was talking about Jay Vitez Racecars, not sure about OrangeIROC

[Ninja]

@fairgentleman Z

agreed

If you were using a bolt in cage the bolts should be double shear, that is two bolts 90* of each other.

There is another local resource that will be building cages very very soon. I only know of SCCA road racing requirements (6 - 8 point), which is 50X better than that death trap.

All you want is just a main hoop attached at the rear struts or do you want a real cage?

double shear is when a bolt has two points of shearing force… I’m confused when you say two bolts 90 degrees of eachother…

A single bolt can be in double shear.

http://www.ijee.dit.ie/OnlinePapers/Interactive/Philpot/bolted_double.htm

take away the top or bottom plate… and you get single shear… which is generally frowned upon since double shear is twice as strong.

[fairgentleman_Z]

@Ninja

snip

Yeah, Yousif said the same.

I saw somewhere the use of two bolts. Say you have a tube, and another tube that acts as a sleeve for the first. Then they had two bolts, perpindicular to the other, a couple inches spacing. In case one failed.

But know that I think about it more the “sleeve” would prevent movement that would cause the failure I am thinking of…

Do you like Cheetos?

[albaaboog]

ok
did some calculations and found that the a 1.5 inch .120 mild steel tubing will fail long before a grade 8 bolt in fact the the yield stregnth of 1018 mild steel is 36ksi while a military grade 8 bolt has a yeild stregnth of 120ksi plus it is in double shear assuming the bolt is 5/16 the load before deformation is 18,398 lbs while for the steel tubing with that axial load on it, would deform 2.6 inches

if you are not sure run the numbers mec of solids was not my best class

[fairgentleman_Z]

@albaaboog

snip

My requirement is 5/16" Grade 5 minimum.

And “military” grade is just plain bullshit, trust me.

[Ninja]

@albaaboog

ok
did some calculations and found that the a 1.5 inch .120 mild steel tubing will fail long before a grade 8 bolt in fact the the yield stregnth of 1018 mild steel is 36ksi while a military grade 8 bolt has a yeild stregnth of 120ksi plus it is in double shear assuming the bolt is 5/16 the load before deformation is 18,398 lbs while for the steel tubing with that axial load on it, would deform 2.6 inches

if you are not sure run the numbers mec of solids was not my best class

Im not sure the issue is that the bolt will fail… because if that were the case, all frames would be bolted together and not welded. I see the bolted cage being more of an issue in upredictability… if the cage does fail, I think the bolted peice comes with a level of uncertainty under failure.

When you have all the joints welded… you can more easily predict how a cage will deform… this is just my thought…

All I know is that bolted frame members are usually frowned upon and welded peices are more desired. I can’t really supply a rock solid scientific argument other then the one I suggested here.

EDIT: maybe if the boys at GForce are reading this one of them can chime in.

[albaaboog]

I am not saying that that particular roll cage is good. I am just saying that the bolt don’t make it bad. I know little about roll cage geometry to make that call .