Off topic- but this is virtually the only woodworking group I know…
I need to make 8 of these, totaling 2.25" thick.
I can’t buy oak that thick, so I must glue up.
Question:
Can I face glue 2 boards @1.125" thick (as shown), and expect them to remain flat over time (or do I have to use 3 boards for balance)?
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It depends on how they were cut from the tree but I expect two layers at 1-1/4 in. thick will be fine. Depending on how it gets used, three layers might look nicer. That means you’ll probably be strating with 6/4 and planing it down to get the thickness. You’ll also be edge gluing pieces to get to the 22 in. width. Although not needed for strength (long grain glue joints are stronger than the wood) staggering the joints might make sense.
Since this isn’t about SketchUp Pro I moved it from the Pro category to the Corner Bar.
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Excellent Dave thank you!
I drew the grain in the wrong orientation , but yes, we’ll be planing 8/4 material down (can’t buy 6/4 red oak)…
Would simply gluing 4/4 to a piece of 8/4 warp? (Would save a little planing)
Thank you sir!
I expect you’ll still be edge gluing pieces to get the width.
Maybe you need a different hardwood supplier.
Not likely but again, it depends on how it’s cut from the tree.
I would make the two layers equal thickness, otherwise the thicker one can overwhelm the thinner one if it warps. Not that likely an issue, but an ounce of prevention…
Also be aware that when face-gluing you need to use lots of clamps because the clamp force is spread over a lot of area compared to edge gluing.
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If I’m cross cutting the same board then gluing it to itself outside rings to outside rings(or inside to inside), does this improve my odds of success?
Depends on the way the wood is cut but generally if the annular rings are running across the width of the board, glue them up so they are oriented either like this: () or like this: )( Better would be quartersawn so the rings run vertically through the thickness of the board.
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Yes, quartersawn is way more stable than flat sawn. But 22 inches wide is not likely to be available in qs (and likely to have too much center wood even in flat cut). You would need to edge glue narrower pieces to get 22".
Even at around 15-1/2 inches it’s pretty wide for quartersawn in one piece so as both Steve and I suggested, gluing up a number of narrower pieces to get the width will be the way to go. Probably more important with flat or rift sawn, too.
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Hilarious how you used the parenthesis signs to illustrate this! Never thought to do that.
Thanks!
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Our lumber is only 9" wide max so yes- 2 pc edge glue-up…
(width across grain will be 15.25").
Yes- a definite concern w no press- we normally would have outsourced this, if not for the rush delivery required…
Although your questions have been well-answered, there is an excellent woodworking
forum: Site Map at WOODWEB
Also, as pointed out in alternating growth rings in laminating to build up thickness, you also want to do the same in edge gluing when building up width to help against cupping.
