Getting Out Scantlings

Boatbuilding language includes terms and phases we don’t often hear. Some make sense once you understand their meaning. Others just need definition.

Take that long piece of fine Sitka spruce I bought a couple of weeks ago. It has lots of parts inside. All we have to do is get them out of the raw timber. A lot of boatbuilding is getting out parts. “Scantlings” is an archaic term for “small” and is used in nautical language both to talk of the dimensions of small structural components and of the components themselves.

One of the frequent activities of boatbuilders is making patterns. We have lots of dimensions on paper drawings that need to be transfered to our lumber. Sometimes we’re blessed with ful size drawings of components. Other times, we have to scale up from a drawing to full size, something called “lofting,” a topic for another day.  The Fiddlehead drawings contains one sheet with full size drawings for a few scantlings: the stems, parts for the frames, bulkheads, and carlin braces. Some of these need to be made in pairs, so it’s a good thing to make reusable patterns. I traced the drawings to thin plywood which I can carry to the lumber and draw around.

The spruce will be used for these parts and for a number of long thin parts. The long thin parts will remain inside a 13 foot section of the spruce for a while longer while I get these scantlings out of the remainder.

The first task is reducing thickness, from the rough sawn board to the desired thicknesses of 3/4 inch, 5/8 inch, and 7/16 inch. I reduced thickness first to 3/4 and got out the long part of the mid frame. Then reduced to 5/8 and got out the stems and carlin braces. Then, reduced to 7/16 and got out the rest of the mid frame pieces. Thickness reduction in some shops is done with power planers that use rapidly spinning knives. Thickness reduction in my shop uses hand planes. First, a Stanley #40 “scrub” plane that dates to about 1910 is used to scrub away material quickly. Its rounded blade can take fairly deep cuts and makes quick work when used diagonally across the lumber. A few passes up and down the lumber does the bulk of the work. When close to the desired thickness, I switch to the Stanley #5 “Jack (of all trades)” plane to smooth the marks left from the scrub plane. My jack plane dates to the late 1930’s and I keep it sharp enough to leave a surface that is very acceptable for framework. For the cases where the parts will be exposed and need fine finishing, follow up with a #3 smoothing plane (mid 1940’s heritage) brings the surface to baby butt smoothness.

When cutting the parts, I sometimes use one of the few power tools in my shop, the band saw and smooth the sawn edges with planes, rasps, or sometimes even sandpaper. The results are well made pieces, crafted with almost no dust.

An aside: as I read about people building workshops, one of the first things many woodworkers do is plan for powerful dust removal systems that attach hoses to every electric tool. Each of those tools works by pulverization that creates huge amounts of incredibly fine dust. Left uncaptured, the dust not only creates a mess, but more seriously many health hazards. Hand planes create no dust. Dust from band saws and rasps is large and heavy and usually falls quickly to the floor instead of lingering in the air. Sanding is something I minimize by keeping the planes sharp.

My tools are cheaper, and very much quieter, than all of the electric tools and a lot healthier to use. Instead of consuming electrons, my tools use a lot of human calories, giving me a good workout … and justification for a cool Coors, or maybe an occasional Snickers.


One Response to “Getting Out Scantlings”

  1. Steve Says:

    Hi, Bob,

    Nice work on your model. I’m considering Bryan’s Fiddlehead 12 for my next build, so I look forward to watching your progress.

    Steve