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PLY(WOOD) ???

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Forum topic by unknownwoodworker posted 05-01-2008 04:45 PM 661 views 0 times favorited 3 replies Add to Favorites Watch
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unknownwoodworker

219 posts in 2425 days


05-01-2008 04:45 PM

Topic tags/keywords: plywood

I was going to build something that required one sheet of 3/4” prefinished birch plywood and one sheet of
1/2” (anything will do). I was going to cut the 1/2” into 1 1/2” wide by 8’ long stripes. I was then going to use screws to put then together lying flat (two high).

The dilemma : I only needed a half a sheet and my supplier had one that was starting to “delaminate” on the edge. That’s OK, I only needed half of it length-wise. What I did not realize was that this was no ordinary plywood. It looked great, an Alder veener plywood. I got this $60.00 sheet for only $20.00. Great deal huh?

What this piece of CR was is 1/4” 2 ply DF core with 1/8” MDF on either side. It was not delaminating, one of the MDF layers was separating right down the middle. If you put this CR length-wise between two saw horses and cut it length-wise, the WHOLE thing “delaminates”. I now have 4 sheets of 2’ x 8’.

The good news is the supplier is refunding my money and doesn’t want the PLYWOOD ? back. My neighbors house is all done in alder inside. He might line some closets with it or something.

This stuff (when carried flat and unsupported) bends in the middle from own weight and IT FAILS.

-- ??? My mistakes heat the house. It's very warm in here. ???


3 replies so far

View odie's profile

odie

1680 posts in 2562 days


#1 posted 05-03-2008 02:02 AM

Thanks … it sounds like real c p. (new rules).

-- Odie, Confucius say, "He who laughs at one's self is BUTT of joke". http://woodstermangotwood.blogspot.com/ (my funny blog)

View Karson's profile

Karson

34902 posts in 3122 days


#2 posted 05-04-2008 03:30 AM

Stay away be warned. I guess.

-- I've been blessed with a father who liked to tinker in wood, and a wife who lets me tinker in wood. Southern Delaware karson_morrison@bigfoot.com †

View Peter Oxley's profile

Peter Oxley

1426 posts in 2596 days


#3 posted 05-04-2008 05:03 AM

Interesting. I’ve been using a product that my supplier calls “Classic Core” ply – it’s a ply core with MDF layers on either side as you described. I think it’s either a three or four layer core – I’m sure it’s not two. Then the veener is on top of the MDF. I’ve had fantastic luck with the stuff – it’s flat and stays flat when you cut it, and the veneer layer is smooth instead of following the contours of a ply layer underneath. I haven’t had any problems with it seperating as you have described.

-- http://www.peteroxley.com -- http://north40studios.etsy.com --

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