Coronet1885

Posted By Tom Daniels on April 4, 2012

As you’ve seen previously, a boat of this size requires a lot of framing stock. Those thick slabs of oak are carefully marked, rough cut with a chain saw and then finish cut on the ship’s saw. The ship’s saw allows the crew to cut both the shape and constantly changing bevel of the piece at the same time. One or more people guide the wood through the saw, while another person changes the saw’s bevel angle as the wood passes through the blade. It’s a carefully choreographed operation.

 

 

 

And here’s what it looks like in action:

 

 

After the frames are assembled, they are held in place using temporary gussets and blocks.

 

 

These are eventually replaced by permanent metal floors.

 

 

At the end of January, there were 16 forward and 5 aft frames installed.  By the beginning of March, 18 forward frames had been installed.

 

 

At the aft end of the boat, work was steadily progressing on the transom and supporting timbers.

 

 

 

These templates have been positioned to help visualize how the horn timber will connect to the transom knees.

 

Here is the transom frame, partially disassembled to show the joinery.

 

 

You can see how the lower edge of the frame connects to the transom knee using a mortise and tenon,

 

 

and the upper part of the knee joins the top of the transom frame with a half-lap joint. the lower and upper frames also are half-lapped together.

 

 

This type of joinery adds redundancy to the strength of the connection. One might be able to get by with fasteners, adhesive, and a connecting plates, but the mechanical connection afforded by good joinery provides extra strength and stiffness to the construction. This is why post and beam barns will long outlast a barn that’s built with only nails.

 

If you visit the shop, you’re likely to see some of the regular day-to-day work for prepping stock. For instance, you might see Jono and Leo feeding frame stock into the massive thickness planer.

 

 

Of the handy tools that the crew has built at the shop is a flattening bed. If you have stock that has a twist to it and you send it through the planer, it will thickness the stock but preserve the twist. However, if you flatten one face of your stock and feed that through the thickness planer flat side down, you’ll end up with stock that’s flat on both sides.

 

So, it’s really handy to have a way to flatten one side of your stock, and that’s what this sled does. In the back of the photo, you can see that there is a router mounted on a sled. The router can slide left and right on the sled. The sled itself rides on the rails that go alongside the stock. The stock is placed on the cross supports and the router is set to cut at the lowest point of the top surface of the stock. As the router is passed over the stock, it removes everything above the lowest point, leaving a perfectly flat surface. Simple, yes?

 

Once it’s flattened, it’s easy to lay out and trace the futtock pattern directly on the stock.

 

 

Oh, and those wooden parts that look like cd racks next to the stock? They’re just there to support the wide pattern paper so that it doesn’t flop off of the stock. These guys, they think of everything…

While the sled works great, sometimes it’s just easier to use hand tools to flatten your stock. This is particularly true when the stock is quite large like the horn timber.

Here, Claes is comparing the timber to his pattern.

 

 

The horn timber is on it’s side, with the top to the left. The pattern shows the shape of the rabbet that will be cut into the bottom of the timber.

 

 

You may be able to see the shape of the underside of the horn timber here in the aftmost pattern on the rudder post.

 

 

By mid March, the transom frame had been completed, and all parts fastened together.

 

 

It’ll be a while until the frame is installed, so Jono seals the wood with a linseed oil mix.

 

 

And then, it’s back to sawing out frames.

 

 

 

One of the things about scrap from boat building: you get lots of strangely shaped pieces that are rarely good for anything else. It’s not an accident that many boat builders have wood stoves in their homes or shops.

 

 

Category: Construction & Methods
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