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Posted: 3/8/2008 3:21:00 PM EDT
[#1]
I'm guessing that'll be pretty fucking heavy.
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Posted: 3/8/2008 3:21:46 PM EDT
[#2]
its well needed though |
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Posted: 3/8/2008 3:23:22 PM EDT
[#3]
Its .283 pounds per cubic inch.
(4'*12"/foot)*(8'*12"/foot)*(1/4")*.283lbs/in^3=326 pounds for the full 4*8 sheet. Foot (length)*foot(width)*144*thickness (in inches)*.283 is what you need to get pounds of steel Edited to fix answer. Equation is right, I just left out a number in the calculator. |
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Posted: 3/8/2008 3:24:54 PM EDT
[#4]
Consider what will happen if you have an accident.
If you ran into something solid, that heavy plate of steel could easily slice through the cab, cutting you in half, and keep going. No, I am NOT joking. |
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Posted: 3/8/2008 3:25:19 PM EDT
[#5]
Find the density of the particular type of steel and calculate the volume. Solve for M. Density = Mass / Volume Edit: Spud beat me to it. |
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Posted: 3/8/2008 3:25:43 PM EDT
[#6]
Geez, what the hel;l are you trying to cover up/protect that you need a steel tonneau cover?
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Posted: 3/8/2008 3:26:12 PM EDT
[#7]
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Posted: 3/8/2008 3:26:49 PM EDT
[#8]
The specific gravity for steel is about 7.8 meaning it’s 7.8 times heavier than water.
A cubic foot of water weighs about 62.4 pounds. That means a cubic foot of steel weighs about 487 pounds. (62.4 x 7.8) Divide that by 48 (number of quarter inches in a foot) and it looks like it would weigh about 10.15 pounds per square foot. |
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Posted: 3/8/2008 3:27:18 PM EDT
[#9]
11 thousand dollars of audio equipment |
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Posted: 3/8/2008 3:27:39 PM EDT
[#10]
African steel or European steel
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Posted: 3/8/2008 3:27:44 PM EDT
[#11]
There you go. |
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Posted: 3/8/2008 3:28:37 PM EDT
[#12]
11g's worth of stereo equipment? You ride around in one of those glorified boom boxes?
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Posted: 3/8/2008 3:28:52 PM EDT
[#13]
theres no way it ways 1152 pounds |
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Posted: 3/8/2008 3:29:23 PM EDT
[#14]
its my business (shop vehicle and i compete in db drag) |
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Posted: 3/8/2008 3:31:53 PM EDT
[#15]
It's going to weigh approximately 327 pounds. The volume is 1,152 cubic inches, and he forgot to multiply that by .284.
.25 * 48 * 96 = 1,152 in^3 1,152 in^3 * .284 lb/in^3 = 327.168 pounds |
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Posted: 3/8/2008 3:32:46 PM EDT
[#16]
Should be about 320lb's IIRC...
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Posted: 3/8/2008 3:32:47 PM EDT
[#17]
lol
1100 lbs or about a 1/2 ton.* What kinda truck do ya have? Seroiusly though, make it out of something thinner and reinforce the edges and middle. It is going to be too heavy to lift......... *Yeah I know about the weight ratings on trucks. 
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Posted: 3/8/2008 3:34:32 PM EDT
[#18]
About 500lbs.
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Posted: 3/8/2008 3:35:07 PM EDT
[#19]
It wont keep out anyone determined to get in anymore than 14 gauge. Do yourself a favor and park in a better place with the thinner material.
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Posted: 3/8/2008 3:36:05 PM EDT
[#20]
Not to mention that they can get through the sheet metal walls of the bed using a pry bar. |
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Posted: 3/8/2008 3:36:26 PM EDT
[#21]
This sounds more right than 1100 lbs. I had a 3'x3' plate of 1/4" steel (I made a pistol target out of it) which I was just barely able to lug around. That thing was a fucking herniator and a half, but there's no way it weighed 300 lbs, which is would given the other calculation. 90lbs sounds about right for it. |
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Posted: 3/8/2008 3:48:08 PM EDT
[#22]
Sorry gents, you are correct, I did forget to multiply by density. The formula is right, but the result is 326 pounds. Whoops, quick response with good info, but wrong answer. Can't win them all eh?
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Posted: 3/8/2008 3:48:27 PM EDT
[#23]
Using the 'other calculation' it would weigh 92 pounds. |
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Posted: 3/8/2008 4:02:50 PM EDT
[#24]
thanks guys. maybe ill just use 1/8 steel with a metal frame underneath.
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Posted: 3/8/2008 4:17:00 PM EDT
[#25]
I came up with 489lb. If it is truly .283 pounds per cubic inch. 144 times 48 (thats a cubic foot in inches times 4x8' size)= 4912 (square inches). multiply that by .25 = cubic inches=1728 (cubic inches). 1728(total cubic inches) * .283 (pounds per cubic inch)=489.024
very simple math (ETA, though i might just be a retard )
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Posted: 3/8/2008 4:23:09 PM EDT
[#26]
4*8=32, not 48. |
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Posted: 3/8/2008 4:25:33 PM EDT
[#27]
It's .3 pounds per cubic inch.
Tonneau cover for the ultimate Road Warrior? |
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Posted: 3/8/2008 5:35:00 PM EDT
[#28]
Mild steel plate 1" x12" x 12" wieghs 40.8 pounds per sq. ft.
320 lbs will get you pretty close. 
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Posted: 3/8/2008 5:49:36 PM EDT
[#29]
#252lbs per sheet or 7.875lbs per sq ft. You guys and all your formulas....
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Posted: 3/8/2008 5:51:56 PM EDT
[#30]
Right around 430 pounds... good luck! ETA.. the extra weight is the steel that will need to be added to reinforce the sheet to keep it from bowing and flexing. |
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Posted: 3/8/2008 6:00:36 PM EDT
[#31]
About 325 pounds, by my estimation using mild steel, and thats not including any holes drilled for mounting, hardware, variations in the thickness of the steel and so on.
Way to much. Get a lockable cover and hope no one decides to see what you've got locked up. Better yet, get a van. -Local |
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Posted: 3/8/2008 6:02:14 PM EDT
[#32]
van wont be as loud as a 4th order bandpass. with the setup im going for i shold break 160db |
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Posted: 3/8/2008 6:02:48 PM EDT
[#33]
not a good idea dude... Fiber glass! |
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Posted: 3/8/2008 6:05:25 PM EDT
[#34]
i do quess i could laminate expanded metal between layers of fiberglass |
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Posted: 3/8/2008 6:25:09 PM EDT
[#35]
Fail. Sawzall. Fender.
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Posted: 3/8/2008 6:35:30 PM EDT
[#36]
they wont get very far seeing that there will be frame rail in there way. its a body dropped truck so the frame rail is 4 inches into the bedside plus the cantilever for the bed bags) they they got to cut through the frame rail all the suspension. then through the amp rack then they got to un screw the amps from the amp racks while reaching through the side of the bed. all they cant open the tailgate seeing that its welded shut |
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Posted: 3/8/2008 7:47:08 PM EDT
[#37]
hey, just call me a retard okay 
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Posted: 3/8/2008 8:44:41 PM EDT
[#38]
It may be welded shut, but is it sheet metal? |
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Posted: 3/8/2008 8:53:15 PM EDT
[#39]
Aluminum on a steel frame will work just as well...
Something like .060 2024 or 7075 T6 should be enough (eg thick enough to resist cutting with hand-shears)... If they can cut through that, they have a cut-off saw/angle-grinder or other power-tools... And that will get through 1/4 steel too... Remember: they don't have to defeat the 1/4 steel all the way around... Just at the locking point(s)... P.S. If you can build it out of sheet metal (steel, aluminum, whatever)... I can probably figure out a way to get in using portable tools... (No, not a burglar... Airframe & Structures mechanic for the Army... ) |
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Posted: 3/9/2008 6:44:18 AM EDT
[#40]
Probably ought to try one, you'll get a better answer. A sheet of steel 48X96X 1/4 inches is 1152 cubic inches. Steel is approximately 0.30 pounds per cubic inch. If you use 0.28 or 0.29, you'll be close enough, but the final weight is contingent on the weight added by the joints and paint, so a larger number should be used for estimating. The weight of that 1/4 inch thick sheet is 1152(0.3) = 346 pounds, there's no way around that. |
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Posted: 3/9/2008 6:50:33 AM EDT
[#41]
Easier to make the gear removable rather then try to protect it.
If someone wants it they WILL get it, 1/4 steel cover or not. |
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Posted: 3/9/2008 6:50:56 AM EDT
[#42]
 
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Posted: 3/9/2008 6:52:21 AM EDT
[#43]
yeah thats what i was thinking let alone if you roll it..... |
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Posted: 3/9/2008 6:55:48 AM EDT
[#44]
You know, it'd be just as easy to take the whole damn truck. Hook, winch, and go. perhaps you should chain it to the ground...
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Posted: 3/9/2008 7:02:55 AM EDT
[#45]
Even with 1/4", you'll have to have some kind of frame. And, I would be willing to bet that unless you use an completely unreasonable amount of weld to secure the frame to the plate, you will have endless rattles. The rattling may, in turn, cause random weld failures. |
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Posted: 3/9/2008 9:29:35 AM EDT
[#46]
Dude, you didn't actually answser 50 cal's question; but I have to say, 'IF' you're one of those idiots that drive around with the Bass turned up so high it rattles windows from 4 blocks away then you deserve what ever misfortune that befalls you. If you're 'business' is selling or installing that shit, even more so!!!... 
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Posted: 3/9/2008 9:35:53 AM EDT
[#47]
Steel has a density of about 8g/cc, or 8 times heavier than water. An inch is about 2.54 centimeters, so a square inch is 2.54^2 square inches, or 6.45 square centimeters. A 4x8' piece of steel has about 29721 square centimenters. A quarter inch is .635 centimeters, so multiply 29721 by .635 and you get 18873. That much water would weigh 18873 grams. But steel is eight times heavier, so this plate would weigh about 150984 grams, or about 332 pounds. |
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Posted: 3/9/2008 9:41:53 AM EDT
[#48]
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Posted: 3/9/2008 11:30:03 AM EDT
[#49]
OP should have asked "best way to protect $11k in a pickup?" (not unreasonable to have that much in range trip, etc.)
would be better thread, but the 1/4" cover is funny. I guess 400 lbs isn't that much.... but gotta be better way to do it. rock on |
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Posted: 3/9/2008 11:44:30 AM EDT
[#50]
General purpose 1045 steel= 10.21#'s per sq.ft.
4x8 sheet= 32sq.ft. 326.72#'s ETA- Numbers provided by Ryerson. This is who, the company I work for, gets its metal from. |
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