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Old 25th June 2005, 04:52 PM   #1
atnaat is offline atnaat  Wales
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Default building an enclosure

I need to build an enclosure that's 37x37x37inches. I'm going to use MDF I’m not sure what thickness. I'm really confused about constructing it. Could I just do mitre joints or am I going to have to build a frame and build around it?
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Old 25th June 2005, 06:11 PM   #2
Stocker is offline Stocker  United States
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You can use 3/4" if you add a little internal bracing. I would seriously consider using 1" MDF however, and possibly for an enclosure that size, if it will be used at high output levels a pair of 3/4" sheets glued and clamped together to make 1.5"

You can use miter joints if you like. That may be the best bet for a nice brushed or sprayed finish, if you are skillful with the cuts and careful with the construction. You can build around a frame if you like. What I usually do is just plain old butt-joints, where the hardest part is subtraction and addition to get the panel sizes correct.
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Old 25th June 2005, 08:23 PM   #3
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wel i for mine i did 3/4" mdf and rabbeted the sides if i spelled it right i took a router and cut about halfway through the thickness of the material on the edged and it i so strong i could stand on it with no bracing and screws about 2" apart mine was 30"L*13"W*10"D
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Old 25th June 2005, 11:48 PM   #4
Collo is offline Collo  Australia
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Quote:
Originally posted by Stocker
What I usually do is just plain old butt-joints, where the hardest part is subtraction and addition to get the panel sizes correct.
I use butt joints backed by a bracing strip, and also find it easy to make a mistake with the maths.
After building a box too short, I wrote some software to help me prototype different box sizes and then print my cutting list. I've used it on a few subs now and find it very handy - I think others will too.

Apparently it's frowned apon to post links to yourself in messages, so if you want a copy, see the site details in my profile - go to "Free software" and download "boxnotes". The page also has a link to online instructions.

Note for you Yankees - you will have to work in metric - its a lot easier do the maths to adjust by 1 or 2 mm rather than increments of say 1/64 inch.

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Old 26th June 2005, 04:35 AM   #5
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meteric is much easier.... I will agree with you there

If only my table saw had metric
If only my tape measure had metric

looks like I'll be using english for a while.... Damn the luck
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Old 26th June 2005, 04:36 AM   #6
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Not to say that tape measures dont come in meteric (they do) or table saws either.... but the ones I have dont have it, so there you go
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Old 26th June 2005, 04:48 AM   #7
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You call us Yankees.....

I kinda like that.... Alot of people say Americans.... but America is not our country, it is the United States of America. America IMO is collectively the continents of north and south america which would make anyone living on those continents "americans." For some reason it is rarely seen that way and people from Canada are called Canadians, people from Mexico are called Mexicans, blah blah blah, you get the picture. No one calls some one from Canada an american, or at least I've never heard of it. So why do we from the United States get labeled american. Seems wrong to me.... Yankees, now everyone knows that the Yanks are from the U.S.A.


Back to the thread topic.... Unless you're a good woodworker, miter joints are tough to get perfect. Building an internal frame is a very good idea to get a very ridged box that will not have panel flexing. Use at least 3/4 inch MDF if bracing is less than every ~7 inches and/or if the driver in question is capable of over 105db maxSPL
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Old 26th June 2005, 07:29 AM   #8
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Collo:

Regarding your website - Kudos and a job very well done! One of the smoothest operating, fastest loading, easiest to navigate sites I've seen.
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Old 26th June 2005, 08:27 AM   #9
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BassAO,

I'm from the U.S. but don't call me a %#@& yankee !!!

On topic,
Waste your time and money if you want using 1" or 2 3/4" layers, but you still need bracing anyway. Shelf bracing is best and with an enclosure that size, I'd use 3/4" material and 3 shelf braces with 3 perpendicular cross shelves if I was going for the gusto, but 2 would probably be sufficient.
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Old 26th June 2005, 08:57 AM   #10
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Quote:
Originally posted by Collo
Apparently it's frowned apon to post links to yourself in messages,
Not at all...

Here is the link http://www.users.bigpond.com/bcolliso/freesoft.htm

Too bad the software only runs in Windoz

dave
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