Gone Tubin' pics of chop deux

[Carpenter]

max, arches work more effectively against impact or pressure, in a single axis.

Exactly.

 

[Letterman]

Where's the picture of the tube bender that you were going to post? Tease.

Yeah I would love to see what you used to make them bends!

 

[mengleff]

wow. that's f@ckin cool.

i have a feeling pics of this are going to be popping up on bunches of boards...

 

[Beezil]

 

[Fore Wheeler]

nice sh!t there B, explains alot.

 

[Rufies97XJ]

nice sh!t there B, explains alot.

yes it does...
No wonder Sean want's one... wow.

 

[Letterman]

wow that is nice, I can get one at harborfreight for $19.95 right?

 

[Georgia Mike]

So,Beezil.....I was just kinda wunderin'....you know....if you didn't mind...well,you know......if you wanted to and all.........



You gonna make up some standard weld together interior cage kits for us less fortunate loyalists???




I'm serious,by the way

 

[Drewman]

In talking about the strength of curved steel a major topic was left out, "Cold Working". When the steel is bent it puts tension on one side and compression on the other. When these stresses are imopsed on the steel the atomic crystaline structure of the steel forms dislocated layers, (think of sheets of paper sliding around on top of each other). As you start to move layers of the steels crystal structure around it becomes harder and harder to move the other layers because the layers that were moved intially prevent the unmoved layers from moving. This in turn creates a stiffer part. A good example would be to take a peice of .25 inch diameter 1020 or therabouts steel and bend it into a "L" shape, now try to bend it back staight again. It will be much harder to bend it back because its been cold worked. This principle works great in logitudally stressed members. But as previoulsy mentioned when it comes to pure tesion or compression stick with straight tubing.

Nice Cage!

 

[Kaczman]

Beezil, I hate you.

Are you still planning on skinning it with Al, or are ya gonna leave it tubed out?


-Jon

 

[MaXJohnson]

Originally posted by Beezil:
max, arches work more effectively against impact or pressure, in a single axis.

I used the analogy of the top decks of steel coil flatbeds....

arches were used in architectural forms, before modern materials allowed post and lentil to be a reality.

both are very strong, in different ways.

tension vs. compression

Originally posted by Rev Den: "Now support only the ends of the tube and exert pressure against a line perpendicular to the supported ends. A curved tube will support more pressue that a straight tube. A good example is a unloaded flatbed truck. You will see a curve up in the center."

Originally posted by rockcralwinxj: "Reminds me of the VW commercials talking about how arches are the strongest. Example : domed stadiums, Ancient irrigation aquaducts, and really high train track bridges. All depends on which direction the pressure is exerted on the arch."

All three of you have come to the same conclusion: An arch is a very strong shape when the load is in a very specific direction. So, if all that tubing is merely for impact protection, it should work great as long as Beezil's driving style insures impact in the optimal direction.

If, on the other hand, some of the tube members are meant to carry loads in tension and compression to work with each other, use of curved tubes will be weaker than straight tubes.

The flat bed truck is a poor analogy. An arch is strong because its shape directs the force of a given load through the legs to a strong foundation. The foundation is carrying the load. The flat bed truck is unconstrained at each end and therefore depends solely on beam strength. The arch isn't there to add strength. The designers realize that under load the bed will bend a certain amount and build in a curve in the opposite direction to compensate.

In the case of Beezil's cage, the curved tubes are constrained at each end, but in many cases the attachment is in the middle of another tube member. This will not provide the required resistance required of an arch.

It's still sexy.

If Beezil was born a girl, he'd probably always wear low-cut blouses and keep his "hi-beams" on.

 

[Hunter-LynchburgVa]

Beez, what kind of input function do you feed the computer to get the bend you want, say for example for that rear horseshoe, or any of those bends?

Hunter

 

[hpi_jeep]

beezil can make coil springs with that

 

[Economos]

I can't even think straight right now... holy sh!t.

 

[Beezil]

max, you are making peffect sense, and the topic/debate would be an awesome thread....

I think we should start a new one, wanna?

I'm not very conerned about weak points.

the rear was made for look primarily, the drivers cockpit is all triangulated, rollover protection the priority, and is trail tested on a moderate lay-over....nothing budged.

hunter, the programming is elementary.

first input is radius, second input is length, third input is speed.

and unlimited numer of lines of code can be inputed.

the radius is determined by material, which is inputted seperately in a database.

before a new material is rolled, you would manually roll three tubes, the deflection roll (a2 roll) is put in a position to create a graceful bend, a moderate bend, and a sharp bend.

you tell the machine where its a2 roll was (position) and input the radius.

the radius of a rolled tube is found using an arc meter....

the machine also needs to know tangent point of the rolls, the tooling diamters, the material diamter and elasticity modulus to calculate spring back.....

might sound confusing, but its actually quite simple.

 

[Beezil]

oh yeah, on a progressive shape like a parabola, once the machine "knows" how to position is deflecting roll to give a desired radius, it has a shape program....

in the parabola shape screen, all you have to do is input width and height, and the amount of "steps"

a parabola with 5 steps would have a radius centered at the apex, and two mirrored radii at each leg.

3 diffeent radii in total.

that parabola would look kinda ghetto though.....

the big horizontal parabola I used has 13 steps. one at the apex and 6 on each leg. Each individual radius is "blended". you can't see the transition os different steps....

does that make any sense?

 

[Economos]

Beez, are you having trouble with your server cause some of your pics aren't comming up for me.

Edit: There they go, nevermind BJ.

 

[Chark]

Nice job Metal Monkey...... 1st a couple questions....due to my not keepin' up with the board. What brand of shock are you running? Also are the spring packs homebrew? After....reading the entire thread.....I noticed once again, Sean aka...OneTon's still longing for your equipment....hell I guess if that's what rocks your pony....I'm not one to judge. Again, nice job!

 

[Georgia Mike]

"Inputted"

Beez,you're really from the south,ain't ya? Come on now,don't lie. It's nuthin' to be ashamed of Now,about those cage kits.......

 

[BrianG]

oh crap gotta change my pants again...3rd time today.