View Full Version : Finding Volume of an Odd-Shapped Box?

Pr1m3

01-15-2009, 01:17 PM

Hi there, I was messing around in SketchUp and made a box for 2 12"s, and I was trying to figure out the volume, and I can't figure it out.

Any idea how to do it?

This is what it looks like:

http://img165.imageshack.us/img165/1155/212boxtopcopyjo5.jpg

http://img165.imageshack.us/img165/1613/212boxfrontcopydl3.jpg

http://img165.imageshack.us/img165/2019/212boxanglecopyip0.jpg

Louisiana_CRX

01-15-2009, 01:20 PM

fill it up with sand ....then pour all the sand into a large square shaped box...then it will become as simple as measuring the volume of sand in the square box...:)

99grandprixGT

01-15-2009, 01:21 PM

fill with water.

bball09124

01-15-2009, 01:22 PM

Use math.

Pr1m3

01-15-2009, 01:24 PM

See the plan was to figure out the volume before I built the box.

Anyone else? Or should I just give up a build a rectangular box?

mokedaddy

01-15-2009, 01:25 PM

Divide the box into sections, taking the volume of each part and adding them together.

assuming that is a right angle you figure the full square and divide by 2.

If its not 45° or are not very diligent at math then fill it up with sand. Or packing peanuts will also give you a descent guestimation.

Pioneer~Saturn

01-15-2009, 02:07 PM

^Yea, devide and concur. And pythagoreans therom will come in hand I'd bet..:)

quins90lac

01-15-2009, 02:08 PM

fill with packing peanuts then pour them in to a 12in square box thats one cubic foot

Pioneer~Saturn

01-15-2009, 02:13 PM

He wants to calculate before making it, guys..

Undisputed King

01-15-2009, 11:24 PM

I think making an enclosure like that would be a pain in the *** with all the angles, and all the trig involved in making the cuts, what about the port? The bottom of the port will be longer that the top, what will you do to compensate? I think your better off with a simpler enclosure, take Calc III, you would be able to figure out the volume, I know we learned how last semester, im sure if I had the eqn's of the odd face, I would be able to figure it out, but that requires to crack open my book.

jdawg

01-15-2009, 11:27 PM

i learned how to calculate volume in middle school.

KyleBechtold

01-15-2009, 11:27 PM

well what subs will be in it? and if you don't make it slant back it would be easier to calculate/build

shaneb

01-15-2009, 11:32 PM

Break it up into different shapes and calculate those shapes volume, then add.

Skip01

01-15-2009, 11:39 PM

Fill it with resin than remember how many cans it took......BAMMMM........its that easy

jdawg

01-15-2009, 11:40 PM

you could also go back to 8th grade and relearn math

Undisputed King

01-15-2009, 11:48 PM

http://i8.photobucket.com/albums/a20/DIRT-RIDER/Enclosure.jpg

Assuming that both the triangles on the top an bottom are identical, just take each triangle find the area, then multiply it by the diangonal height to find the volume of each trinagle cylinder on each side, then find the area in the square in the middle of the two triangles, and multiply again by the diagonal height. Then you are left with a wedge shape after simplifying it down by solving for the complicated area in the front. Make sure to subtract the material thickness where need. Using that method should get you really close, since slanted material calls for subtracting a little more than material thickness due to the Potagorean Theorum.

Undisputed King

01-15-2009, 11:52 PM

Jdawg the reason I said Calc 3, is because we learned to calculate awkward shapes using integrals and eqn's of planes and contraints, in short we learned the mathmatical way to do it. For example we learned to calculate the volume of a sphere that was sliced randomly, so basically it has a slice missing. And so on But I finally realized how to do it the easy way.

Undisputed King

01-15-2009, 11:56 PM

If you built it in Solidworks with the material thickness subtracted out it would tell you the volume of the enclosure.