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Jdizzle
12-18-2007, 05:34 PM
i still have no idea how to do this at all so say

my box is 53in long, 18inch tall, 4in top depth, 12in bottom depth what would that equal out to? and care to explain it?

djman37
12-18-2007, 05:36 PM
you could
1. google trapezoid volume formula
2. try the12volt for their calc.
3. break the trapezoid into rectangle and triangle volumes to get trap volume.

Anniku989
12-18-2007, 05:37 PM
Length x average depth x height

53L x 8D x 18H = 7632in^2

Take half of the sum of the top and bottom depth to find the average depth

mlstrass
12-18-2007, 05:39 PM
Use the calc here:

http://www.the12volt.com/caraudio/boxcalcs.asp#wed2

Jdizzle
12-18-2007, 05:39 PM
i already did i could only find area forumlas not any volume

miker
12-18-2007, 05:40 PM
53, 8, 18... 8x18= 144... 144x52= 7632/ 2 (b/c it's a tri.) = 3816 in cubed.

Then you do 4x18x53= 3816+3816 + 7632... then divide that by 1728 (1 cubic foot) and you get
4.42 cubes

Jdizzle
12-18-2007, 05:40 PM
wow nice thanks alot guys

mlstrass
12-18-2007, 05:40 PM
Wedge2 volume calculator...........

shortyg83
12-18-2007, 05:46 PM
53, 8, 18... 8x18= 144... 144x52= 7632/ 2 (b/c it's a tri.) = 3816 in cubed.

Then you do 4x18x53= 3816+3816 + 7632... then divide that by 1728 (1 cubic foot) and you get
4.42 cubes

Yea i dont think that is right at all.

Im pretty sure his box would be 3.2cubes

ultimate157
12-18-2007, 05:50 PM
53, 8, 18... 8x18= 144... 144x52= 7632/ 2 (b/c it's a tri.) = 3816 in cubed.

Then you do 4x18x53= 3816+3816 + 7632... then divide that by 1728 (1 cubic foot) and you get
4.42 cubes
You have to take into account wood thickness.

Yea i dont think that is right at all.

Im pretty sure his box would be 3.2cubes
yes, 3.2 cubes after subtractiong wood volume.

miker
12-18-2007, 05:51 PM
Umm no... It is right... Yeah lol /\/\/\/\ I just rounded..

ultimate157
12-18-2007, 05:54 PM
Umm no... It is right... Yeah lol /\/\/\/\ I just rounded..

Read my edit. You forgot box to subtract wood thickness.

miker
12-18-2007, 05:57 PM
Read my edit. You forgot box to subtract wood thickness.

Ahh.. Dang your right...

miker
12-18-2007, 05:58 PM
**** a whole cube?

Immacomputer
12-18-2007, 07:06 PM
i already did i could only find area forumlas not any volume

Area times distance equals volume.

djman37
12-18-2007, 07:27 PM
i already did i could only find area forumlas not any volume

Area times distance equals volume.

kids these days. I bet if it was on an Xbox they could do it:eek:

bjfish11
12-18-2007, 07:36 PM
Im getting 3.2 cubes as well...

IonSQL
12-18-2007, 07:40 PM
3.1616112268518518518518518518519cf.... rounded off of course :)

bjfish11
12-18-2007, 07:45 PM
3.1616112268518518518518518518519cf.... rounded off of course :)

Nice.... but I think your a LITTLE bit off :laugh:

ultimate157
12-18-2007, 07:48 PM
3.1616112268518518518518518518519cf.... rounded off of course :)

Much further off than you think ;)

It would take trig and more time than I want to spend to find that accuracy.

~3.2 is good enough though :)

IonSQL
12-18-2007, 07:49 PM
Nah, just takes AutoCAD ;)

ultimate157
12-18-2007, 07:52 PM
Nah, just takes AutoCAD ;)

It also depends on how you cut the front, top/bottom, and sides as to how the outside dimensions correlate to the inside :)

bjfish11
12-18-2007, 07:53 PM
It also depends on how you cut the front, top/bottom, and sides as to how the outside dimensions correlate to the inside :)

HUH? lol

IonSQL
12-18-2007, 07:53 PM
true, but using those dimensions, in a perfect world.... well, there ya go :)

93EXT
12-18-2007, 07:57 PM
use Rockfords site.

ultimate157
12-18-2007, 08:00 PM
HUH? lol

Let me make a terrible MS paint drawing ... will help explanation.

In the top picture, the wood thickness is .75 + the width of the angled cut.

In the bottom picture, it would only require .75 to be subtracted for internal volume calculation :)

http://i22.photobucket.com/albums/b342/Ultimate157/trapezoidalboxtop.jpg

IonSQL
12-18-2007, 08:02 PM
top = yucky :(

ultimate157
12-18-2007, 08:03 PM
top = yucky :(

Didn't say it would look good :laugh:

IonSQL
12-18-2007, 08:04 PM
lol

bjfish11
12-18-2007, 08:05 PM
Let me make a terrible MS paint drawing ... will help explanation.

In the top picture, the wood thickness is .75 + the width of the angled cut.

In the bottom picture, it would only require .75 to be subtracted for internal volume calculation :)

http://i22.photobucket.com/albums/b342/Ultimate157/trapezoidalboxtop.jpg

It would be very hard to build a box like that.... To get a good angle, you need to angle both pieces.

If you only angle one piece, and try to butt it up with a square edge, the thicknesses wont match up ;)

IonSQL
12-18-2007, 08:07 PM
Less surface area too for the joint too...

bjfish11
12-18-2007, 08:10 PM
So theoretically, if Im thinking clearly, no matter the orientation of the panels, the volume should be the same? Correct?

ultimate157
12-18-2007, 08:26 PM
So theoretically, if Im thinking clearly, no matter the orientation of the panels, the volume should be the same? Correct?

Assuming all other dimensions are the same (top depth, bottom depth, and height) then the first picture would have a higher volume than the bottom.

At least this is how I based my argument. probably would've been good to know in the beginning :laugh:

bjfish11
12-18-2007, 08:30 PM
Well... here would be the two ways you could correctly build it... If Im thinking right, volume shouldnt change...

http://i171.photobucket.com/albums/u282/bjfish11/untitled.jpg

ultimate157
12-18-2007, 08:34 PM
Well... here would be the two ways you could correctly build it... If Im thinking right, volume shouldnt change...

Http://i171.photobucket.com/albums/u282/bjfish11/untitled.jpg

I see what you're saying.

bjfish11
12-18-2007, 08:39 PM
Yea. Couldnt tell if you would be able to understand what I was saying, given my sub par design skills... lol

Lakota
12-18-2007, 11:42 PM
Tripple integration :)