Reply by TWegs

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Posted on Need advice on unusual glue up

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65 posts in 1175 days

#1 posted 12-04-2018 03:26 PM

Regarding the wood movement, a few thoughts… When the table takes on moisture from humidity, it will expand width-wise and will do so proportionally across the length, which shouldn’t create a problem. Because it’s tapered down the length, that just means that you’ve severed the length of the wood fibers on the tapered ends, so they won’t be there to expand or contracts and won’t be there to cause pinching into the adjacent boards. It also appears you are using the same species across the top, so you won’t have to worry about disproportionate movement. The bigger issue will be the grain direction from how the lumber was sawn. If it’s flat-sawn or rift-sawn and you don’t alternate the grain direction, you could have some undesirable cupping of the top when it starts expanding from humidity or starts contracting as it dries out.

A good practice is to start taking your project in the house and keeping it at a normal room temperature when you’re not working on it. No point in building it and storing it in a climate that is much different than where it will be used. Regarding the glue up, use some scrap boards to make a jig so you can glue it up square. I think you just need two right triangles with the 90 degree angle at the outside bottom. Use the triangle jigs to brace against the sides when you do the glue-up. Before gluing, do a test clamp up with two bar clamps stretched across the width, then ensure your measurement corner to corner is consistent so you know it’s square. Use shims to get it where you want, then go for it. Be careful not to over-tighten the clamps so as not to starve the joints. Good luck.

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