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A customer has requested that I make a very large table. My question is that the top will be 5/4 ash approx 5.5 wide by 8 ft long .
For your tabletop there is nothing wrong with TB3 as your adhesive.
If you are able to to prepare your edges properly the addition of biscuits
My next question is, why to you see or feel the need to butt join your boards to achieve the 8' length needed for the top?
Do the top out of full length boards.
As long as the boards are of low MC and when the top is attached to the frame it is secured in a manner to allow for seasonal movement something that wide will work.
My 2 cents,
When I have to glue up a big top like this, I tongue and groove the boards on the shaper, and because Iím gonna my to leave the top clamped up overnight, I use epoxy to glue up. I find the tongue and groove makes all the boards line up near perfect, and I donít have to worry about a board slipping up or down with clamp pressure.
Thank you both Mark and Matt for your responses. The table in question is 16 feet long. I have to make it two halfs to get it to the customers house. I can do the top in all 8 footers, but I don't want a seam down the middle.
Find out what humidity the owner will have in the wintertime, such as 35% RH. Then, take all your components and put them in a small plastic-lined room with that exact humidity for a week or two. This means that you will make a table that will be happy in the winter. After manufacturing, move the table back into this controlled RHroom so that any issues will show up in your shop rather than at the customerís place. Ship the tops wrapped, as well. Remove the plastic partially if the RH is not with 30-40% RH. If under 30% RH, expect problems.
We do a lot of this type of job, we run the boards trough the moulder with glue line cutter heads, then we use our Taylor Clamp carrier, there are two things you have to consider, how you going to screw the top to the base, you have take account wood movement, and the other thing is you have to be careful what type of edge you going to use for the table top, you can get small hairline fracture in you finish.