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Sound Reinforcement - Forums for Live Sound Professionals - Your Displayed Name Must Be Your Real Full Name To Post In The Live Sound Forums => SR Forum Archives => LAB Subwoofer FUD Forum Archive => Topic started by: Steve Shafer on April 27, 2010, 08:44:54 pm

Title: Lab Sub construction question
Post by: Steve Shafer on April 27, 2010, 08:44:54 pm
I showed a cabinet maker friend of mine a set of plans for the LAB Sub and asked him what he would charge me to do all the cutting.  I want to do the assembly work and the finish work, but with just the small table saw that I have avaiable to me, the cuts for the Lab sub are just too difficult and perhaps dangerous for a portable contsturction site table saw. So I need to get the cutting work done for me.

Has anyone went to the big lumber outlets/cabinet making shops who use CNC machines to do the cutting?  If so what did they charge you for cutting and the wood for two subs?  

Also, can the CNC router machines perform all of the angle cuts/miter cuts on the various panels?  I just dont see how I am going to be able to make these cuts on the small table saw that I have.

Title: Re: Lab Sub construction question
Post by: Silas Pradetto on April 27, 2010, 10:32:46 pm
A CNC router will certainly cut any angle you can imageine. Problem is the head usually won't rotate, so anything other than a straight up and down cut has to be done with an angled router bit. LABs certainly do not standardize on one angle, so you'll probably end up buying all different angle bits for the CNC company. Fortunately, they last a while and you'll be able to use them for future builds.

Most shops charge CAD time to move the plans into their proprietary router software, and then actual router table time. You can have them buy the wood or provide your own, but expect the final labor of cutting to be around a couple hundred dollars per sub.
Title: Re: Lab Sub construction question
Post by: Lasse Lukkari on April 29, 2010, 12:01:40 am
You can do 3D stuff with 3 axis machine without any special bits. Here is an example:

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Title: Re: Lab Sub construction question
Post by: Lasse Lukkari on April 29, 2010, 01:16:49 am
Close-up:

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Title: Re: Lab Sub construction question
Post by: Brad Tomlinson on May 11, 2010, 10:51:18 pm
A radial arm saw works well for those pieces if you don't have a 3 axis machine.  However I definitely screwed a few up before I got those cuts right.

I bet those LABs made of MDF are pretty heavy  Shocked
Title: Re: Lab Sub construction question
Post by: Lasse Lukkari on May 13, 2010, 03:31:44 pm
Brad Tomlinson wrote on Wed, 12 May 2010 03:51


I bet those LABs made of MDF are pretty heavy  Shocked


Only those pieces are made of MDF. Everything else is birch ply.

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Title: Re: Lab Sub construction question
Post by: Ben Lawrence on May 14, 2010, 03:50:59 pm
The guy building my lab subs also had a really tough time with those final flare pieces.
Title: Re: Lab Sub construction question
Post by: Ben Lawrence on October 28, 2010, 10:26:09 am
Hi,
i just got my access panels yesterday and am looking at wrapping up this labsub. I was looking at this diagram showing how they are attached with a long bolt from the access panel to the  baffle boards. Do any of you just use t nuts to attach the access panel directly to the outerwall?
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Title: Re: Lab Sub construction question
Post by: Silas Pradetto on October 28, 2010, 10:39:51 am
I don't even do that. I just recess the outer piece of wood with the router and screw the access panel to the wood. It's not going anywhere once it's doused in silicone.
Title: Re: Lab Sub construction question
Post by: Ben Lawrence on October 28, 2010, 11:33:34 am
Ok,
I was unsure if that was a critical bracing between the outer wall and driver baffle. As you can imagine I would rather not take the time to line up those 7" bolt holes.
Title: Re: Lab Sub construction question
Post by: Ben Lawrence on October 28, 2010, 11:35:04 am
Panels fit like a glove though.

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