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Old September 25th, 2011, 01:05 PM   #1
cerial
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Default Clear field of vision?

Been looking at various cages and how they perform in rolls taking account for the weight. I really like the cage from trentfab my old design is very loosely based upon it. But, they have a support across the center of the windshield. Is there any way I could possibly make this support removable so that this could be street legal in regards to field of vision so that I don't get pulled over by every rookie that wants to chat.
The current solution is having a 1.5 od bar between the front and rear dash that rides on a 1.75 odx250 3"long bar that can be slid up against a wedge mounted on the upper windshield bar and held in place by a hitch pin both on the bottom and top. But would Like some feed back on this.
Here is a craptastic sketch if your confused about what I'm talking about.
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Old September 26th, 2011, 08:06 AM   #2
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I like that you named your sketch "craptasticsketch.jpg", nicely done.

Not to overthink this, but I don't really like the hitch pin idea. Go with something like this, it's clean, strong, and won't make noise as you drive when the tubes are installed.

http://www.kartek.com/Product/Fabrication/Clamps.html

Side note, has anyone been pulled over or cited for having windshield bars in their field of vision?
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Old September 26th, 2011, 08:28 AM   #3
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X 2 on the tube clamps. I've never used them personally, but have seen them used for various applications and they work beautifully.
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Old September 26th, 2011, 10:14 PM   #4
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That clamp is a great idea never even considered using that size bolts due to sheering but that design seems firm.

I try to think of every scenario. It is more to pass inspection then anything. Although I have went over the form and it is more about lights and the wheels being covered then anything.

It would just suck to build this weld in some windshield bars paint it then need to cut out and grind down the bars and tear apart the dash. Personally yea, I don't see anyone around here saying anything. But it is something I could see myself getting pulled over for on a boring day or becoming a issue when I go to get a assembled title on this.

Those threads stripping or the allen bolt itself sheering is something that I do see happening though with smaller bolts. Your right though pins of any type would vibrate like a mother driving me nuts. The bottom really does not need a pin of any type I was not thinking there the pin should go through the wedge connecting both bars together. The bottom being 1.5 od with the 1.75x250 diameter over it should leave no room for it to vibrate. I see grinding down the 1.5 od a bit to make it easier to slide the bar and adding a grease fitting so I can put just enough between the two pipes so that they do not squeal. When the bar is down I could see using those allen bolts though with that collar welding one piece to the pipe and the other to the dash it would surly keep it from moving anywhere.
The wedge thing is going to be a location for the rear view mirror preventing anyone from saying it was blocking my view in any way. I would just need to move the mirror around to put up the bars.

I could use some type of bolt(s) to attach the tube to the wedge or have a 2x3" piece cut making the wedge out of one piece then drilling/adding a threaded slug inside welded at both ends then grinded down flush. I could also put slugs into the tube ends and drill out a hole for the bolt to fit through. With 2 APR bolts drilled tightened at both ends into the slug against the tube the bolt would be the fail point.
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Old September 27th, 2011, 11:37 AM   #5
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Quote:
Originally Posted by cerial View Post
I try to think of every scenario. It is more to pass inspection then anything. Although I have went over the form and it is more about lights and the wheels being covered then anything.
Just get it inspected before welding in the windshield bars?

Quote:
Originally Posted by cerial View Post
The bottom being 1.5 od with the 1.75x250 diameter over it should leave no room for it to vibrate. I see grinding down the 1.5 od a bit to make it easier to slide the bar and adding a grease fitting so I can put just enough between the two pipes so that they do not squeal.
Ew, greasy dash tubes... that wouldn't be my first choice. If you're dead set on making them removeable, you're probably not as concerned about absolute cage strength, right? You're not racing this thing, right? Just do a single vertical tube in the center of the windshield and use two interlocking tube clamps or some engine cross-over tube disconnect flanges and just bolt them together.

No stainless lug nuts man, don't overthink this.
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Old September 27th, 2011, 09:51 PM   #6
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No, I'm not racing this or anything like that. I'm not building this thing not to any rule guidelines or whatever just going off a proven design. Heck, the doors will be removable and have power windows. At 70" wide 60" tall and 130" running 35's(end to end including the tires not just the frame) long, I'm building it as a secondary driver/weekend toy actually. I would like to scratch the belly at rocks/valleys a bit this time next year hopefully. But, this will more be for playing in the woods, or over landing for a long weekend pulling a small off-road trailer around the orv trails by the bridge then taking the expressway back down at 75mph.
I just see this as a vulnerable part of the cab that could cause injury and looking of street legal way to lessen that. The uprights behind the driver are beefed and triangulated, so are the a pillars, and the uprights on the hood. The windshield should not(hope not)cave in more then a few inches if it does any.
I'm just thinking of more scenarios of like standing it on the rear end and having it come down backward and crush the windshield kind of deal(kind of like this idiot does
). This is one of those better then nothing false security kind of things.
I'm really secure of how the design is coming along as far as safety vs weight in the limited dimensions I want. I am over thinking on some items like this. Sure I can collar and sleeve it to get that added strength I want.
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