I've only got a few repairs to go on this barn, then it will be stored against the wall, and the other barn in the pics will be pulled apart, and I'll get started on that one. I worked with our architect to measure and document each piece of the frame. Each time a part needed a repair, he would draw it up on the spot. The documenting took, I think eight days, he would come to our shop once a week. In the meantime, I would be cutting repairs the rest of the week. As the project progressed, he started making the repairs more interesting. No two repairs are identical, although some are of a similar nature. Yesterday, I started laying out and cutting the last timber to be repaired, and found two repairs the likes of which I hadn't encountered before, two face patches in an Anchorbeam. This has been an interesting timber to repair. At first, it seemed that it would be very easy to just pop a couple of face patches on, kind of like what I did on that plate patch. Then, after studying the drawing, I realized that the repair was not a simple square edged block, but a multi-sided contraption that I didn't really have a name for, although "face patch with compound double under squinted pains in my ass", was one I had in mind. In the end, it turns out these two patches are in a way the coolest I've done so far.
So, this is going to be a long one. Here is one of the anchorbeams. It's about 10"x17"x24'. It's one of the small ones, the big ones are 10"x22"x24'. The timber gets levelled in width and length. I do this for most layouts, but not usually for the cutting, but in this case, there is a special consideration. #1 Anchorbeam with some of the tools required to layout and cut the two repairs.
The rest of the tools. I also used my Boss Double Eagle boring machined, not pictured. The screw gun is only used to install the Headlok fasteners. Everything else is done by hand.
Here is the first repair partially cut. As you can see, the wood is a little crossed grained, and also a bit brashy, I think the term is. It doesn't work well, and already has some defect, as you'll see later. As I mentioned, the timber is levelled for the cutting in this case. That is because there is only one reference line (chalked line from the layout process) for each plane of the repair. I had to develop a solution for that in the next photo.
In order to ensure the repair piece will fit, I had to make sure the planes were square to each other, and cut according to the layout. I did this by establishing small spots that were level, and then using a square to make sure the horizontal and vertical planes were perpendicular to one another. These spots I marked, and then cleaned the rest to the same depth.
Finished. Repair is about 4' long. Notice that it is trapezoidal in both planes. This is where it gets interesting.
This is the next repair on this timber, and the one I've so far cut the patch for. The double undersquintedness of the repair is very evident here. An undersquint is where there is an angle in a joint that helps to capture one of the two pieces. There was a big knot in this repair, which I cut off with a hand saw. If the knot was sticking straight out, and the patch didn't have to slide into the hole, I would have drilled a hole in the patch and kept the knot. Why? Because I have a weird sense of humor.
When I rough out a repair piece, it has to be oversized by about 1/4" to 1/2" so that I can hew it to fit after I've glued or screwed it in place. This caused me a little concern at first, as I didn't know how I was going to lay it out oversized. In the end, I figured out that if I used one side of the block as a reference, and projected the lines around the piece, I could get the angles I needed. I'll admit I was a bit amazed when the lines ended up where the were supposed to be after I went all the way around the block. The next pic is a little fuzzy, but shows some of this layout. The upper horizontal line is the actual finished size of the block, give or take a little hewing. The red lines project past that to the upper surface and go all the way around the block.
Funny shaped block of wood.
Blocked dropped into the hole. Part of the reason for over sizing the repair block is so that I can plane of chisel away some of the wood to get it to fit the timber. In this case, the repair block will be the "standard" to which the timber will be fitted to, as it has been cut in nice hand planed and square block of wood. Now that the block is in there, I can see where I have to clean out a little in the timber to get it to fit the rest of the way in.