|Forum topic by Brett||posted 08-08-2012 01:47 PM||1753 views||0 times favorited||6 replies|
08-08-2012 01:47 PM
I’m building a Roubo workbench from southern yellow pine. I have two boards, each 1.25”x4”x48”, that I want to face-glue to create a stretcher that is 2.5”x4”x48”. The pine is very good quality but somewhat bowed and/or twisted (one board is bowed about 0.5” along its length and the other is twisted about 15 degrees, which is the angle a second hand on an analog clock moves in 2.5 seconds—a fairly substantial twist). I’m trying to decide whether to replace these boards or use them as they are.
If I choose to use them, here’s my plan: (1) Lay the boards on a flat workbench and clamp them very tightly onto the workbench, making sure the boards are straight, lined up correctly, and in full contact with each other; (2) drill holes for two rows of screws, with holes every 4”; (3) Drive the screws into the boards, remove the clamps, and check that the assemblies are square; (4) If they assemblies are square, remove the screws, glue the boards together, clamp the boards together onto the flat workbench, and put the screws back in; (5) Leave the boards in clamps for 24 hours until the glued is completely dry.
If I follow this procedure, will the glued & screwed assemblies stay straight or will the tension in the boards eventually cause them to warp or come apart? I could buy new lumber, but it’s hard finding southern yellow pine that is as clear as the boards I have, plus I don’t have a powered jointer or planer, so it’s not a simple matter to thickness the boards from 1.5” down to the required 1.25”.
-- More tools, fewer machines.