Time to drill the center holes in the circles (I know exactly where the center is since I used the indention for the compass). Walk over to my… FRICK! The circles are too large to fit in my by about a 1/2″.
Keep in mind the circles are no particular size. I didn’t even measure them out. I just made them as large as possible with the wood I bought. The important thing is that they are exactly the same. The dimension is not important since they are just a spinning platform for the swift arms.
You might have noticed that my work bench is a slab of steel. Actually it’s a slab of steel glued to a plate of ¾” glass. This is not because I’m crazy, it’s to ensure the surface remains perfectly flat. This is important because normally I build flying model airplanes (when I’m not doing some kind of side project like a swift). As you can imagine straight planes fly better than crooked ones.
Time to attack those nasty edges with my disc sander. Since I’m starting about 1/16” away from my line, (remember how I cut a 1/16” away from the line with my jig saw?) I’ll be sanding down to the line and squaring off the edges at the same time. And since the circles are clamped together they will turn out exactly the same.
After some time and lots of dust the edges are cleaned up and perfectly square. Next I’ll switch to fine grit sand paper on the disc sander to remove the scratches that the coarse sand paper leaves behind. But that will have to wait for another night…