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Author Topic: any experience building br-218's?  (Read 5502 times)

Elliot Thompson

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Re: any experience building br-218's?
« Reply #10 on: December 19, 2006, 01:57:13 pm »

bryan holroyd wrote on Tue, 19 December 2006 15:48


i have a full function woodshop, and have made many cases etc. before, just never used it to do a production run of cabinets. that's why the screws comment set off a few questions, i love using wood glue and crown staples. yeah it takes a little more time and work, but you get smooth lines and a great bond. rarely do any staples back out, and i don't have to worry about stripped threads or anything when repairs may be needed... thanks



My Double Eighteens have been through a lot for 11 years, and I have never repaired any of my boxes period.

One thing you forgot about screws, they counter sink into the wood. Staples are like nails. People build boxes with staples than nails because it's faster to assemble than screws.

When it comes to strength, screws win over staples. Just bringing this to your attention, in case you haven't realized.




Best Regards,
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Elliot

Mike Butler (media)

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Re: any experience building br-218's?
« Reply #11 on: December 26, 2006, 09:30:00 am »

Tony Tissot wrote on Fri, 15 December 2006 13:48

...18MM void-free plywood (3/4" rough equivalent) as a minimum for subs.  11 mm will probably resonate, unless ultra-engineered.

OP was looking for 11-ply, not 11mm.
3/4" (18mm) plywood can be anything from 7 to 13 plies.

Tony Tissot wrote on Fri, 15 December 2006 13:48

...They should be built like a tank and absolutely rigid...
Agreed.

Tony Tissot wrote on Fri, 15 December 2006 13:48

...Staples will not serve you long-term...

They only have to serve you (to hold things in place) until the PL adhesive sets. After that, mechanical fasteners--be they screws, nails, brads or staples--are just along for the ride.

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Mike Butler (media)

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Re: any experience building br-218's?
« Reply #12 on: December 31, 2006, 01:43:22 pm »

[quote title=Elliot Thompson wrote on Tue, 19 December 2006 13:57]
bryan holroyd wrote on Tue, 19 December 2006 15:48


...When it comes to strength, screws win over staples. Just bringing this to your attention, in case you haven't realized...

If you are relying on screws for strength, you are using the wrong glue. Most commercially built speaker enclosures are assembled without metal fasteners of any type. Just bringing this to your attention in case... Very Happy

Of course, these companies have jigs and fixtures and machines to clamp them together under high pressure that we homebuilders don't have, so we make use of screws, nails, staples, brads, to hold everything together so it doesn't fall apart before the glue sets.
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Elliot Thompson

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Re: any experience building br-218's?
« Reply #13 on: December 31, 2006, 04:10:15 pm »

[quote title=Mike Butler (media) wrote on Sun, 31 December 2006 18:43]
Elliot Thompson wrote on Tue, 19 December 2006 13:57

bryan holroyd wrote on Tue, 19 December 2006 15:48


...When it comes to strength, screws win over staples. Just bringing this to your attention, in case you haven't realized...

If you are relying on screws for strength, you are using the wrong glue. Most commercially built speaker enclosures are assembled without metal fasteners of any type. Just bringing this to your attention in case... Very Happy





Actually, Very Happy

My Double Eighteens are framed (More Skeleton)with 2 by 4's and the ply is drywall screwed from both sides (From the outside into the 2 by 4, and the inside of the 2 by 4 to the ply)with silicone between the ply (18 mm) and 2 by 4's

With a double baffle board (18 mm x 2) to mount the woofers, strength is the least of my problems with these cabinets. Laughing   The idea was to build them as strong as possible when I was 15 years old.

I never used glue because everyone kept showing me Elmer’s wood glue. I would imagine, they thought I was making a model airplane or something (A kid claiming he’s 15 but looks like 12 wants to build speaker boxes) So I bought 6 Tubes of GE silicone and 6 boxes of drywall screws, and began building 6 double eighteens.

By the time I was 21, had a total of 12 using the same method.

Best Regards,
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Les Webb

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Re: any experience building br-218's?
« Reply #14 on: December 31, 2006, 05:02:36 pm »

Where screws win for me is if your plywood has a slight warp to it then the screw will pull the warp out while a staple or nail (especially if shot out of a gun) oftentimes will not.

My two cents

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Mike Butler (media)

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Re: any experience building br-218's?
« Reply #15 on: January 06, 2007, 05:24:57 am »

Les Webb wrote on Sun, 31 December 2006 17:02

Where screws win for me is if your plywood has a slight warp to it then the screw will pull the warp out while a staple or nail (especially if shot out of a gun) oftentimes will not.

My two cents



I've done that with 1/2" ply to bring some crazy wood into square. It works like a clamp. A nail shoots too fast and has no threads to move the wood. Often I would remove the screw and putty the hole after the glue sets.

Of course, if you have to do this with 18mm Baltic birch, perhaps you need to have a talk with your wood supplier. Rolling Eyes
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