LumberJocks

Dealing with bent, twisted southern yellow pine?

  • Advertise with us

« back to Woodworking Skill Share forum

Forum topic by Brett posted 715 days ago 1139 views 0 times favorited 6 replies Add to Favorites Watch
View Brett's profile

Brett

620 posts in 1280 days


715 days ago

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”.

Thanks.

-- More tools, fewer machines.


6 replies so far

View MrRon's profile

MrRon

2716 posts in 1841 days


#1 posted 715 days ago

I don’t think it will work. It may take some of the twist out, but some will remain. You could try wetting down the boards, clamp them until dry and see if that works. You could also rip boards from plywood and laminate them together.

View Doss's profile

Doss

779 posts in 862 days


#2 posted 715 days ago

Without seeing how the grain is oriented in those boards and knowing what type of environment they’re going to be exposed to, this is going to be a tough call.

The pine down here loves to twist plus it’s fairly soft. I don’t know what your’s is like, but I don’t know if I’d go through all that trouble to try to make something work on a workbench and then have to replace it down the line.

Post some pics up of the boards and ends. Thanks.

-- "Well, at least we can still use it as firewood... maybe." - Doss

View Loren's profile

Loren

7230 posts in 2245 days


#3 posted 715 days ago

Hand plane one side of the twisted board flat. Glue the bowed
board to the flat face. Then let the glue-up settle and see
how it moves. Then square it up and work with it as one
board.

-- http://lawoodworking.com

View bondogaposis's profile

bondogaposis

2439 posts in 949 days


#4 posted 715 days ago

I think you need to joint and flatten the boards in question first. Then glue them up or you will have problems for ever.

-- Bondo Gaposis

View Infernal2's profile

Infernal2

104 posts in 795 days


#5 posted 715 days ago

Considering the price and the relatively small amount of wood, why not just replace them? Save the pieces for a shorter run on another project. 15% isn’t huge, but over a 4’ stretcher it would be a pain to deal with and in my mind, would be to remove and keep the same relative thickness. I’d also think with that much spring in the boards (between the two parts) would create too many easily avoidable possibilities for failure.

View Brett's profile

Brett

620 posts in 1280 days


#6 posted 715 days ago

Thanks, everyone. The boards were already thickness-sanded to 1.25”, after having sat in my garage for a couple months. The grain is angled across the wood—definitely not in a quartersawn orientation. As much as it pains me, I guess I’ll have to start over—I don’t want to have to replace a stretcher on a workbench with drawbored mortise-and-tenon joints.

-- More tools, fewer machines.

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com

Latest Projects | Latest Blog Entries | Latest Forum Topics

GardenTenders.com :: gardening showcase