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Old 6th July 2013, 09:46 AM   #1
ODougbo is offline ODougbo  United States
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Default What Plywood are you buying?

AKA - Plywood from Box Stores; this is from yesterdays project

1st pic - One 7" rip, moved rip to other side so two factory edges are side by side. To my surprise at least a 3/4" gap. This is often the case with oversized sheets e.g. 49" x 97" this measured standard 48 x 96.

Okay, some manufacturing issues with the factory's saw blades; now what about strength? Took some of the small pieces and simply broke them in half with hands, like the glue was watered down and sprayed on between layers.

(While I was there; checked out the plywood edges on the box store racks, there was a lot of de-lamaintion - a bit of a nightmare at $50 per sheet and hours of labor needed for a project)

Posting this here because I cringe when I see some of the guys putting large speakers in box store plywood. Now sure, not all "batches" are the same, some may be fine, but really can't tell until final stages of the project.
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Old 6th July 2013, 11:15 AM   #2
JLH is offline JLH  United States
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I never buy 5 ply (7 if you count the veneer faces) because it isn't strong enough in my opinion. I only buy 10 to 12 ply birch, or Apple plywood. For me it is less expensive to build it right the first time than building it twice. I value my time more than that. If the big box stores don't carry what you're looking for, then look up the local cabinet shop. Many times they are willing to sell ply wood for 10% over their cost.
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Old 6th July 2013, 01:27 PM   #3
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Originally Posted by ODougbo View Post
AKA - Plywood from Box Stores; this is from yesterdays project
The veneers of box-store plywood are now un-sandable.
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Old 6th July 2013, 01:33 PM   #4
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I never used plywood for speaker enclosures. The best choice so far is MDF.
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Old 6th July 2013, 02:36 PM   #5
DrDyna is offline DrDyna  United States
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Quote:
Originally Posted by jackinnj View Post
The veneers of box-store plywood are now un-sandable.
Oh yeah, the laminated ply they sell at lowes can be un-laminated with 100 grit sandpaper by hand in about 30 seconds :P
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Old 6th July 2013, 02:37 PM   #6
DrDyna is offline DrDyna  United States
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Quote:
Originally Posted by lanchile View Post
I never used plywood for speaker enclosures. The best choice so far is MDF.
I use MDF a lot, the drawbacks are...trying not to breathe the extremely irritating dust..(brown boogers that burn are terrible) and weight.
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Old 6th July 2013, 03:02 PM   #7
ODougbo is offline ODougbo  United States
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If you can get MEDEX - you'll never use MDF again; less dust, machines nicely and paints beautifully...

Hot DIY tip: Try added a layer of BB ply to back of composite wood boxes, you'll be quite surprised

Sample MEDEX pic below:
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Old 6th July 2013, 03:05 PM   #8
Jsixis is offline Jsixis  United States
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I buy from Home Depot or Menards depending on who has the better plywood that day.
I find it amazing that 1/2" plywood is the same price as 3/4" plywood here in Ohio.
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Old 6th July 2013, 03:16 PM   #9
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by lanchile View Post
I never used plywood for speaker enclosures.
Quote:
Originally Posted by lanchile View Post
The best choice so far is MDF.
funny statement if you have never used anything else

this year I have built several projects using plywood .... and have almost become an addict, making all sorts of nice things from the leftovers
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Old 6th July 2013, 03:18 PM   #10
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Quote:
Originally Posted by DrDyna View Post
I use MDF a lot, the drawbacks are...trying not to breathe the extremely irritating dust..(brown boogers that burn are terrible) and weight.
That is why there are masks
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