I've discovered that plywood will warp (surprise surprise)! Bad enough that it happened with some really cheap stuff. I also have some pieces that look like they're good quality stock and even they aren't as dead flat as I'd like or as I'd hoped.
So, how flat is flat? I've got a piece of 1" thick ply (actually 31/32nds) that I'd like to use as a fence for a crosscut sled. It has about a 1/32 crown across its 11" width but it appears to be flat along the length. Other pieces appear to rock a tiny bit when tested on a flat surface (saw table).
Just how flat should I expect a sheet of plywood to be?
So, how flat is flat? I've got a piece of 1" thick ply (actually 31/32nds) that I'd like to use as a fence for a crosscut sled. It has about a 1/32 crown across its 11" width but it appears to be flat along the length. Other pieces appear to rock a tiny bit when tested on a flat surface (saw table).
Just how flat should I expect a sheet of plywood to be?
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