Today we installed the first new white oak steam bent frame. This is out of about a dozen or so frames so no great celebration is called for yet. We tried to install the two frames (below) yesterday but realized we needed a better method to get the frames to take full shape of the planking. A kerf (the long cut parallel to the grain in the lower piece below) was made for half the length of the frame to make bending easier. Better not to kerf if possible, but it's even better not to break all our frame stock. Boiling the frames would probably be a more reliable method to make them flexible but we can't justify investing in the setup, so long as we are patient with the steambox.
The steambox setup. A standard plywood box ~77 inches long. The 'boiler' is an old galvanized tank purchased from Pacific Marine Exchange on closing day for 50% off. The closing of the PME is a sad day for boat maintainers and junk purveyors in the region.
(Above) The short half-moon-looking templates were scribed and cut from 2x10s. These will be clamped against the steamed frames to distribute the clamping pressure and help convince the frames to bend to their new shapes.
Bob removing the first frame after about 2 hours of steaming.
(Above) Stressing the new frame before bending in place. The fibers on the outside face lifted and the frame broke. Luckily the other steamed (& kerfed) frame went in without too much complaint. Bob (below) pointing out the fine work.
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