# Sticky Packing peanut volume measurement

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=41102
Printed Date: July 31, 2021 at 9:02 PM

Topic: Sticky Packing peanut volume measurement

Posted By: s7726
Subject: Sticky Packing peanut volume measurement
Date Posted: October 18, 2004 at 1:46 AM

I think one simple sticky post with how to use packing peanuts to measure the volume of an enclosure would save a lot of posts.

Gavin S.

SWEDISH RICE!

Replies:

Posted By: Melted Fabric
Date Posted: October 18, 2004 at 12:53 PM
I was just thinking about that the other day.  Proper use of peanuts to measure volume space.  I would also like information on it.

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I have not failed. I've just found 10,000 ways that won't work.

When you do not know what you are doing and what you are doing is the best -- that is inspiration.

Posted By: dxav
Date Posted: October 18, 2004 at 1:17 PM
It really isn't that difficult. If you fill a container that is 1" x 1" x 1" with packing peanuts, you get 1 ft3 of volume. Moving this amount of packing peanuts into another container that is of a different shape, but the peanuts still fit will yeild the same cubic volume.

Othewise, if you have an oddly shaped enclosure (fiberglass, let's say), fill it with peanuts the same way. Then you need to take those peanuts out and put it into a cardboard box that has easy dimensions to measure, and find the volume the peanuts consume in that box. That is the interior volume of your 'glass enclosure.

DXAV

Posted By: boxmaker85
Date Posted: October 18, 2004 at 1:42 PM

hey dxav don't you mean 1' x 1' x 1' (one foot by one foot by one foot)?  not 1" (one inch).  But yeah that's probably the most comon and easy.

Posted By: dxav
Date Posted: October 19, 2004 at 8:36 AM
Hahaha, yeah, good call, Boxmaker. Thanks!
I usually don't denote measurements in that style -- now you know why!

DXAV

Posted By: boxmaker85
Date Posted: October 19, 2004 at 7:54 PM
lol had to say something b/c i could see some newbie wondering why he is only able to measure one peanut in his 1" x 1" x 1" measuring box at a time.  and wondering why his box sounds so crappy.  You never know about people today

Posted By: dxav
Date Posted: October 20, 2004 at 9:13 AM
I can easily get 4 peanuts into a 1" x 1" 1". Can't you?!

Seriously, though. Did my explaination work for you s7726 and Melted Fabric?

I noticed it is a stick now, so it probably should be ok.

DXAV

Posted By: bndallas
Date Posted: November 09, 2004 at 12:34 PM
ok  say you have measured in a cardboard box . How do you put that measurement into the (fiberglass enclosure ) before you do the frame work and put the resin on the jersey material or fleece? do you just guesstamate? I would hate to build a box and then go cut the holes for the speakers and fill it with my peanuts and have alot left over..or is there  a way to compensate for the lost peanuts? I know I probably sound stupid and the answers probably in front of me,but , oh wells.

Posted By: s7726
Date Posted: November 09, 2004 at 12:41 PM

I have heard the general concensus is to guess BIG, then you can put in some extra random space taking material if it's too much space.

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Gavin
SWEDISH RICE!

Posted By: dxav
Date Posted: November 12, 2004 at 8:57 AM
Well, after the material is stretched over the ring and back, I just don't seal one small hole, and fill the peanuts thru that. Then I take them out, put them in the box, and measure. Then if the ft3 is good, I seal the fiberglass enclosure up completely. I usually use hot glue, holds well, and is not permanent. If you are stretching over MDF, then use a staple gun for the final streching.

DXAV

Posted By: /R7
Date Posted: November 28, 2004 at 1:00 AM
boxmaker85 wrote:

lol had to say something b/c i could see some newbie wondering why he is only able to measure one peanut in his 1" x 1" x 1" measuring box at a time.  and wondering why his box sounds so crappy.  You never know about people today

i had a bad picture of that in my head too, but it was me doing the work -_-
thanks for clarifation lol

Posted By: awhitcomb615
Date Posted: December 24, 2004 at 2:05 PM
ok im so friggin confused. Im building a custom encloser that molds to my trunk. Im not really sure what you guys are talking about with those packing peanuts. I know you need the right volume for your subs to sound good. Im just not sure how to achive the right volume. i guess this is where those plastic peanuts come in right??? so what do i do or how do i measure it?

Posted By: Stanford1621
Date Posted: January 08, 2005 at 9:46 AM
the "packing peanut" method can only tell you how much volume is in an enclosure the best thing to do is try and measure the space of the enclosure as it is being builg by getting an average width, heigth and depth and figuire airspace from that but remember build it slightly larger becuase it is easier to subtract airspace then add more once your done add packing peanuts to get an closer measurement of airspace then fine tune from there.

Posted By: JShane
Date Posted: January 19, 2005 at 6:35 PM

When using packing peanuts you must use small ones like the ones used in bean bags if you want more accurate volume.  I personally use Sand but if you use sand get it ALL out before using the box.

Posted By: Master Asylum
Date Posted: February 14, 2005 at 10:24 AM

Thanks for the clarification Shane. (I was about to ask, why kinda peanuts are you supposed to use and how tightly do you fit them.) Thanks to Stanford as well (I prolly shoulda figured that out but my brain is on leave right now.)

Though I read somewhere, if you build slightly smaller, you can always stuff it with acoustistuff or whatever, right?

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1998 Monte Carlo w/
Eclipse CD8454
2xRockford 5.25" Power 2-way T152C
2xRockford 6"x9" Punch 3-way FRC4369
1xMemphis 16-MCH1300 5-channel
2xKicker 12" L5 Solobaric-2 Ohm

Posted By: johnnyb1231
Date Posted: February 22, 2005 at 12:15 AM
i actually dont care for using packing peanuts... i put a garbage bag into the enclosure and poor water in till its full then dump it into a bucket and measure liters than convert to cubic feet

Posted By: Master Asylum
Date Posted: February 22, 2005 at 10:26 AM
... Water leaks from trash bags, easily.... I guess if you don't have any water issues that'd work. I personally am not a friend of water.

-------------
1998 Monte Carlo w/
Eclipse CD8454
2xRockford 5.25" Power 2-way T152C
2xRockford 6"x9" Punch 3-way FRC4369
1xMemphis 16-MCH1300 5-channel
2xKicker 12" L5 Solobaric-2 Ohm

Posted By: johnnyb1231
Date Posted: February 22, 2005 at 9:38 PM
thats why you get the heavy duty contractor bag... ive neve had one leak on me yet

Posted By: Master Asylum
Date Posted: February 23, 2005 at 10:37 AM
I have... Like everytime. I really figured that ya know, nails don't get through it easily, why would liquid. Yeah, the porch was pretty wet after that idea. Atleast I got it outside before it leaked. GIven for short use, that may not be a problem, but prolonged could be bad. And anyways, water is constantly wanting to move, how do you keep the bag from just tipping over and pooring all out? Sure you can do it again, but you know how pissed and demotivating that'd be? What is the economical ratio on the two ideas? (Mainly how much are the bags vs the peanuts which are like infinite for reuseable.)

-------------
1998 Monte Carlo w/
Eclipse CD8454
2xRockford 5.25" Power 2-way T152C
2xRockford 6"x9" Punch 3-way FRC4369
1xMemphis 16-MCH1300 5-channel
2xKicker 12" L5 Solobaric-2 Ohm

Posted By: oonikfraleyoo
Date Posted: February 27, 2005 at 12:00 AM
I like the bag idea. But why not sand in the bag? Alot of boxes have MDF and water could destroy your whole project with a leak or spill. Sand would measure very accuratly and with the bag it would fix the clean up problems associated with sand.

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Nik
Jeeputer Progress
[|||||||||||-] 90%
Check it out.

Posted By: boxmaker85
Date Posted: February 28, 2005 at 6:56 PM
What happened to plain peanuts? Unless you guys are doing a perfect competition enclosure .001 cu.ft. won't make a difference for you guys i promise. You will be more worried about the air pressure more than if your box is off by ten thousandth of a cu. foot. IMO.

Posted By: lilbenny
Date Posted: April 05, 2005 at 7:49 PM
umm exactly when are you guys doing this "peanut packing" is this before you soak the fleece or after?

Date Posted: June 29, 2005 at 12:03 AM

Lets say someone has a strange shapped box (like me).
First you can make a full scale foam mockup of the box (using either expanding foam or whatever). Then get your mockup and a 1 gallon bucket(milk jug) and go into your bathroom. Fill the water up to a level where you can submerge the entire mockup, then mark the side of the tub with a sharpie, add a gallon, mark with sharpie, add a gallon, mark with sharpie, etc.... unti you have marked enough to match the desired volume. (Ex: 5.5 gallons = .75 cubic ft). Now submerge the mockup and see where you stand with your volume. Is it too big, then sand it down, too small them add some foam until you get it perfect.
Now wrap that beyotch in foil and start laying up your fiber glass. This way you can get an acurate volume before you start building the box, instead of measuring it after and hoping you got the right CU FT.
I hope this helps,
Peace

Posted By: skitty4fingers
Date Posted: July 27, 2005 at 9:38 AM
dont forget to subtract your material thickness bracing ext. it adds up quick

Posted By: Firstnbass
Date Posted: September 06, 2005 at 4:55 PM