Replies

1. 
   DRBWWing | Apr 20, 2020 11:35am | #1

   How did you flatten them? If you milled them unevenly, it unbalances the wood.

   How did you store them? If they don't have equal air flow, same thing.

2. 
   muskokalayne | Apr 20, 2020 11:45am | #2

   Is the air dried lumber,sounds like a moisture problem with the oak should be around 8 percent.And how is the shop heated, may be to dry or to damp. Cheers.

3. 
   user-3478121 | Apr 20, 2020 12:25pm | #3

   Hi

   Flattened them by hand and they’ve been stored flat on racks.

   Thanks

4. 
   user-3478121 | Apr 20, 2020 12:27pm | #4

   Hi

   No heating in the shop - it’s around 30C here at the moment and very dry.

   I think the boards were air dried but I have no way of checking their moisture content at the moment.

   Thanks

5. 
   gulfstar | Apr 20, 2020 05:45pm | #5

   Are they cupping along the same curve of the growth rings or is the cupping in the opposite direction than the rings ?

6. 
   john_c2 | Apr 21, 2020 09:56am | #6

   That's from case hardening the board during kiln drying. When you resaw you release the inner stresses, and the boards will cup.

   When drying wood, sticker it to allow it to move, to do what the wood wants. Once you mill it, including resawing, do NOT sticker it. You've dimensioned it, so you should build it into your piece right away, to keep it from moving.

   If you dont use milled parts right away, don't let air circulate around it. Absolutely no stickers. Put a board underneath, and on top. Add some weight, or clamps. Keep it from moving until you use the parts.

7. 
   roy.unit8c | Apr 21, 2020 09:58am | #7

   It sounds like the red oak is flatsawn. Quarter-sawn or rift-sawn red oak is much, much more stable. That's about the only way I use red oak, sweet gum, or sycamore, because they all tend to warp if flatsawn.

8. 
   user-3478121 | Apr 22, 2020 05:47am | #8

   Thanks for the feedback. Will give try to weight it until I build it in and see what happens.