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Roll Cages - Southern Ontario

Posted by hudson 
john vanlandingham
John Vanlandingham
Junior Moderator
Location: Ford Asylum, Sleezattle, WA
Join Date: 12/20/2005
Age: Ancient
Posts: 13,994

Rally Car:
Saab 96 V4



Re: Roll Cages - Southern Ontario
February 06, 2006 12:17AM
PAddy Wrote:
-------------------------------------------------------
> The knee bar is debatable, but went in anyways. I
> sat in my seat today, and I have about 3.25"
> between my upper thigh and the bottom of the bar,
> but if I end up adjusting the seat to get a better
> view, I may end up moving the bar up if feasible.
> I like the idea of having a crossmember there, but
> the space is somewhat lacking with all the heater
> stuff sitting in there...

What the hell you have National health Insurance, don't worry.
>
> In terms of the gusseting, I would really like to
> see some sort of explanation for why plate gussets
> are more failure prone than a taco in a region
> like the main hoop's X brace. Not a 'everyone
> else does it' explanation, a real reason I can
> draw on paper and think about.

Fer fucks sake Paddy cut a piece of 1/8 plate place it ONCENTERLINE on your bicep and forarm, then have a freiend grab you hand and apply closing force.
The are not merely neutral things, they tranfer loads to a POINT, the end and can tend to collapse the tube there.

These are
> accessory braces in any case (originally it was
> only supposed to be the X in the diagonals), so I
> am not particularly concerned, since the whole
> extra X more than compensates for a small stress
> raiser (if it exists) in the rear stays. Keep in
> mind the number of sanctioning bodies which still
> require 1/8" plate gussets in all cage
> junctions...not that it's ideal, but I think it's
> still plenty good.

No it is demostrably and obviously a BAD THING waiting to cause damege The sactioin bodies that REQUIRE the things are dinosuar brained meat heads.
That's no reason to not chop the fuckin things out and weld in something along the sides.
LOOK AT STRESSED constructions like any motorcycle steering head in the last FORTY FUCKING YEARS. They did the "On center thing" in the mid 50s. Steering heads BROKE OFF in quick time.
Frames made with thinner but on both sides, what care guys call TACO style are vastlty LIGHTER and last for YEARS doing FAR CRAZIER shit.
Learn for fucks sake.
>
> In terms of the reinforcements of the door bars, I
> don't think either type of gusset (be it triangle
> or taco) does much good in that regard. A taco
> will just fold upon a side crush, and I don't
> think the triangles will spread the load well
> since they're in the middle of the tube. Really,
> to distribute the stress I'm considering just
> welding a big plate across the whole outside of
> the connection, which would actually give a
> reasonable spreader plate.
>
> We're all going to diiiiiiieeeeee.....
>
> Patrick McVeigh
> Toronto, On
> Ford Sierra - Gp 5






John Vanlandingham
Sleezattle, WA, USA

Vive le Prole-le-ralliat

www.rallyrace.net/jvab
CALL +1 206 431-9696
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PAddy
Patrick McVeigh
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Location: Toronto, ON
Join Date: 12/21/2005
Age: Settling Down
Posts: 358

Rally Car:
Student Loans



Re: Roll Cages - Southern Ontario
February 06, 2006 08:14AM
> What the hell you have National health Insurance,
> don't worry.

Yah, but I too have been laid up with a bum knee before for 2 months, and I didn't much enjoy it. Not to mention I work in 2 hospitals here and have come to the conclusion that I'd rather avoid them if at all possible....


> Fer fucks sake Paddy cut a piece of 1/8 plate
> place it ONCENTERLINE on your bicep and forarm,
> then have a freiend grab you hand and apply
> closing force.
> The are not merely neutral things, they tranfer
> loads to a POINT, the end and can tend to collapse
> the tube there.

Hokay, I did this, and it pinched me at a point. Then I bent a "U" out of some galvanized 20ga sheet, and it pinched to a slightly bigger point as well (hurt more too). So long as the joint at the elbow remains fixed, everything is going to pinch at a point first.


> No it is demostrably and obviously a BAD THING
> waiting to cause damege The sactioin bodies that
> REQUIRE the things are dinosuar brained meat
> heads.

Waiting to cause damage? Think how hard a hit I'd have to take to crush the main hoop downward enough to stress the reinforcing X enough to push a 1/8" edge through a 0.095 or whatever it is tube. I am more concerned for people without the X in the main hoop like Skye and yourself.


> That's no reason to not chop the fuckin things out
> and weld in something along the sides.
> LOOK AT STRESSED constructions like any motorcycle
> steering head in the last FORTY FUCKING YEARS.
> They did the "On center thing" in the mid 50s.
> Steering heads BROKE OFF in quick time.
> Frames made with thinner but on both sides, what
> care guys call TACO style are vastlty LIGHTER and
> last for YEARS doing FAR CRAZIER shit.
> Learn for fucks sake.

Lighter? The plate doesn't even weigh 10 lbs. I hope to avoid making my main hoop reinforcements a stressed construction for as long as possible, but at least they're there.
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john vanlandingham
John Vanlandingham
Junior Moderator
Location: Ford Asylum, Sleezattle, WA
Join Date: 12/20/2005
Age: Ancient
Posts: 13,994

Rally Car:
Saab 96 V4



Re: Roll Cages - Southern Ontario
February 06, 2006 11:11AM
lighter gauge steel times two, not less avrodupois



John Vanlandingham
Sleezattle, WA, USA

Vive le Prole-le-ralliat

www.rallyrace.net/jvab
CALL +1 206 431-9696
Remember! Pacific Standard Time
is 3 hours behind Eastern Standard Time.
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