Ok, I’m back…
Had a bit of an issue with the bending iron. It seems it is rather delicate and putting it on high (10) is a no no. It’s a Watlow ‘Firerod’ embedded in the aluminum tower. The current flow at 10 apparently burns out the element? It requires about an hour to get to bending temperature – and had I read the sheet that it came with…
It was repaired free of charge and henceforth I will be careful to mind the dial! Nothing past 5 from now on.
Progress! I have both rib sets in place, though only one is ready to build. It takes about 24 hrs to set the hide glue properly and tomorrow I should be able to work the 2nd violin.
First, a pic of the resharpened inside gouges from #1 in this series. Instead of a blunt edge, it’s swept back which helped with sharpening the edge. It’s not as ‘fine’ (smooth) an edge as my chisels, but it cuts the hair on my arm just fine.
Here is the final glue up of the bottom rib. It is one piece of 1.2mm maple. Typically, this would be two pieces butt joined at the bottom block (top block here) where the end pin is. This is a known weak spot with regards to cracks, even more so when you drill a hole in the middle of it! Stradivarius used one piece – he was the master!
Next I show the detail of the corner block which is ‘unfinished’. I still have to trim the extra wings off the ribs and sand down the edges to 30mm at the heel block and 32mm at the end pin block. You can see the extra width of the ribs here.
Here is the finished corner. Note the inside rib fits nicely up to the outer rib? Then I square off the outer rib just to the line of the inside rib edge.
Here is a ‘top down’ detailed view of one of the corner joints.
After centering, I’ve placed the mold on the spruce top. The washers are 3mm and 4mm thick and will be used to define the outside edges of both the top and the back. I don’t know if Stradivarius had washers like this, but I do.
Tracing the outside edge of the ribs with a sharp pencil inside the washer yields the following outline.
Here is the final shape of the back. Next is band sawing the rough shape – don’t cut that line! Afterwords, I’ll use finger planes to get it to the edge of the line.
Thanks for watching!
-- “Once more unto the breach, dear friends...” Henry V - Act III, Scene I