how to calculate volume for slanted box?
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Forum Name: Fiberglass, Fabrication, and Interiors
Forum Discription: Fiberglass Kick Panels, Subwoofer Enclosures, Plexiglas, Fabrics, Materials, Finishes, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=45604
Printed Date: May 02, 2024 at 5:20 AM
Topic: how to calculate volume for slanted box?
Posted By: crazymodgsr
Subject: how to calculate volume for slanted box?
Date Posted: December 20, 2004 at 12:48 PM
I am making a basic box for an old set of 10w6's that I had lying around for my '85 Ranger. Anyway, how do I calculate the internal volume of a box with a slanted front? The box with be 9.5" deep at the base and 6.5" deep at the top. I forget the formula to figure this out w/ this involved. Also, how exactly would I cut the edges of the MDF, so when put together, the edges are nice and smooth. See the circled areas in the illustration below. Thanks 
Replies:
Posted By: rt2party
Date Posted: December 21, 2004 at 10:14 AM
does no one pay attention to the sticky posts at the topof the forum?! fill it with packing peanuts then measure the volume of them. that will be close. someone said sand works too and is more precise, i tend to agree but only if precise = heavy! good luck.
Posted By: realitycheck
Date Posted: December 21, 2004 at 10:34 AM
Hey man if you go right here https://www.the12volt.com/info/diagrams.asp#cal you can put in your dimensions and it will give you the cubic feet of your box ------------- Learning the trade one fiberglass creation at a time!
Posted By: crazymodgsr
Date Posted: December 21, 2004 at 11:31 AM
i know the packing peanuts trick. that's a dumb idea in my case. what am i going to spend hours making this box, and then hope the internal volume is what I need it to be. that's the entire point in designing the box, and figuring out what it's ideal dimensions should be to get the best internal volume
Posted By: Carbonb
Date Posted: December 21, 2004 at 11:54 AM
Well then if you haven't even built the box, then you can already determine what you need the cubic measurement to be.
So what exactly are you talking about? You don't know how to calculate the cubic feet for your box?
Posted By: crazymodgsr
Date Posted: December 21, 2004 at 12:48 PM
i was trying to figure out how I can calculate the volume of a box (before building it), so i can determine what the dimensions of the box should be. a regular box is easy to calculate, but i was sure about a box with a top depth of 6.5" and bottom depth of 9.5", but I have since found a calculator for this
Posted By: daverulz
Date Posted: December 21, 2004 at 12:50 PM
it's already been stated, but here is a link DIRECTLY TO THE CALCULATOR: https://www.the12volt.com/caraudio/boxcalcs.asp#wed
Posted By: daverulz
Date Posted: December 21, 2004 at 1:03 PM
oops ,sorry, came off as a dick, and I didn't realize that you had found the calculator. The packing peanuts is only really useful for odd shaped boxes that can't easily be measured. If the box has straight sides, it's a lot easier to just measure and calculate than to fill it up with packing peanuts.
Posted By: rt2party
Date Posted: December 21, 2004 at 4:48 PM
also- you can divide the enclosure into a square and a triangle-prism and find the volume of each seperate and add them. i didnt realize u hadnt built the box yet. ~Ryan (i mean divide them in your head, not literally sawing the box into 2 pieces.)
Posted By: auex
Date Posted: December 21, 2004 at 5:54 PM
rt2party wrote:
also- you can divide the enclosure into a square and a triangle-prism and find the volume of each seperate and add them. i didnt realize u hadnt built the box yet. ~Ryan (i mean divide them in your head, not literally sawing the box into 2 pieces.)
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Posted By: crazymodgsr
Date Posted: December 21, 2004 at 11:54 PM
yes, i've calculated the box to be .655 cubic feet. now next step is figuring out what the angle is that I need to cut the edge of the MDF with so that it's sits flush. does this make sense?
Posted By: Carbonb
Date Posted: December 22, 2004 at 12:14 AM
45 degree angle is what I'm guessing.
Should be easy if you have a circular saw that can be adjusted for angles.
Posted By: crazymodgsr
Date Posted: December 22, 2004 at 3:53 AM
no, wouldn't be 45 degrees. it's an acute right triangle that is formed. angle would be something like 60 at bottom and 30 at top, but i need to find my old trig equations to get it exactly
Posted By: Carbonb
Date Posted: December 22, 2004 at 11:47 AM
Old trig equations? lol. Maybe if you drew a picture it would be a lot easier if you posted it.
If I had the dimensions of your box it would be easier. If you are going to cut it at 60 on top and 30 on bottom, just remember the other side has to be whatever it takes to equal 90.
Meaning where the two pieces fit together, one is 60 and one is 30. I said 45 degrees becuase you said a slanted box, which made me think you made it have 2 equal sides.
Posted By: crazymodgsr
Date Posted: December 22, 2004 at 5:01 PM
sorry, heres a pic - i just found a trig site though, so I calculated the angles
Posted By: crazymodgsr
Date Posted: December 22, 2004 at 5:05 PM
hm, try this link
Posted By: crazymodgsr
Date Posted: December 22, 2004 at 5:06 PM
Posted By: Carbonb
Date Posted: December 22, 2004 at 9:49 PM
You actually have a tape measure that measures to the thousandth?
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