sub box assembling with brad nails?
Once in a while I will screw a box together depending on the need and if I have a history with the particular driver and power being used. I have had a couple of brad nailed boxes blow apart on me, more due to the idiot who was driving (and not wanting his box screwed down) rather than pressurization or resonation of the box. If I want a stronger bond I will use fibreglass on the inner seams, it is a much stronger bond than screws in general as it covers a much larger surface area. Dukk, I usually paint the inner surfaces of my boxes as it seals the pores in the mdf, mdf by itself is still very porous and bleeds air, paint or resin will help seal it, look at how easy it absorbs water to help prove the point. Yes it can be to do it, but if it makes a better box for a paying customer, a happy customer is a better customer.
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Originally posted by MR2NR:
mdf by itself is still very porous and bleeds air, paint or resin will help seal it, look at how easy it absorbs water to help prove the point.
mdf by itself is still very porous and bleeds air, paint or resin will help seal it, look at how easy it absorbs water to help prove the point.
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50 Watt CAFz'r
Joined: Dec 2003
Posts: 268
Originally posted by DWVW:
</font><blockquote>quote:</font><hr />Originally posted by MR2NR:
mdf by itself is still very porous and bleeds air, paint or resin will help seal it, look at how easy it absorbs water to help prove the point.
</font><blockquote>quote:</font><hr />Originally posted by MR2NR:
mdf by itself is still very porous and bleeds air, paint or resin will help seal it, look at how easy it absorbs water to help prove the point.
</font>[/QUOTE]That is a crazy thought you scare me lol. But to be honest mdf is very porus! Has anyone ever used a vaccum jig? It can breath through m.d.f.! For those who don't know a vacuum jig is obv. a jig, but it attaches to an airline and converts pressure to vacuum, for those keep the fingers away from the router jobs. I have stacked 3 pieces of 3/4 one on top of eachother and all three stay attached! As for the surface being most porous also not true! The surface is treated for ease of finishing. Try this! Take a piece of mdf, sand through the surface in one spot,now coat with latex paint . Where did most of the paint absorb? Through the sanded area! i'm not trying to be smart but i have seen the mdf making process and worked with it every day in like 3 lift a day quantities! Hope this helps guys. Oh yeah that dwvw guy he's crazy!lol
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blah blah - you can make two pieces of MDF stick together with a ShopVac too. oooh-aaahh. [img]graemlins/boring.gif[/img]
The point is your woofer is not a ShopVac. It pressurizes and rarefies the enclosure anywhere from 10 to 80 times per second. There is simply not enough time at either condition for there to be any net air flow through the walls of the enclosure. Attempting to 'seal' the wood is a 100% waste of time.
This is another excellent example of a demonstration that was conceived and passed around by people who have absolutely no business trying to teach anything to anyone else. [img]graemlins/freak.gif[/img]
The point is your woofer is not a ShopVac. It pressurizes and rarefies the enclosure anywhere from 10 to 80 times per second. There is simply not enough time at either condition for there to be any net air flow through the walls of the enclosure. Attempting to 'seal' the wood is a 100% waste of time.
This is another excellent example of a demonstration that was conceived and passed around by people who have absolutely no business trying to teach anything to anyone else. [img]graemlins/freak.gif[/img]
Thread Starter
50 Watt CAFz'r
Joined: Dec 2003
Posts: 268
Sorry guys i wasn't even trying to say mdf is too porus to use for an enclosure just stating that it is a porus material. The only use for fiberglass resin in an enclosure that i know of is strengthening the box.
