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A while back I had decided to build some vegetable planters out of old pallets. I mean, hey, free wood, right? I had originally decided to deconstruct the pallet by yanking out all the nails and reusing the lumber. However, to my annoyance, I discovered the nails were darn near impossible to pull. Every single time you ended up cracking the board you were trying to remove, reducing it to useless splinters.
After a few cracked boards I paused to curse and kick at the pallet, and then sat down and decided to puzzle out a different way of doing it without having to pull out each nail. And here is how it is done:
Step 1Cut slats off the support board
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First just cut the slats off with a jigsaw. Just cut them off from each side of the support beam. You'll end up with a nice pile of slats.
http://mandamakesblog.wordpress.com/2012/05/16/topsy-turvy-garden-week-3/
I think it is going to work out nicely!
There is a tool available(or make your own) for pulling the boards apart, they can then have the nails tapped a bit and pulled out with a conventional crowbar. The tool looks like a two pronged fork with about a 4 foot handle. The tines of the fork are bent so the 2x4s can be straddled perpendicular to the slats and the slats lifted by prying down on the handle. Maybe northern tool (dot com) has them if you want to look. I love re-purpose-ing stuff!
I've had good results wtih cutting the nails flush with a flexible metal cutting blade in my demolition saw (also called a Sawz-all in some places). For people in the united states, these can be found on sale for $19.99 instead of the usual $40 or $60 USD at Harbor Freight Tools. The motors eventually burn out, but so do the motors on the $160 "professional" brands! For throw away tools once they're worn out, I prefer http://www.harborfreightusa.com very cheap tools from China. But I'd never buy a cheapo table saw! A well built table saw (mine's made in USA) will last for decades with simple maintenance.
The good news is, with these thicker sections, you're less likely to crack the wood, other than the thin scraps you don't care about anyway.