Here is another boring video. The machine is in high gear and the 2"bit has the finest threads I could find. If I was to use the low gears I would have inserted the course thread 2" bit, it still wouldn't have been as fast. The mortice is just 3" deep, I have already completed the other half of the through mortice from the other side. White pine and it is frozen making it a little more difficult, you can see the bit gets hung up as it catches in the bottom of the mortice from the other side. These are 43'-6"x10" top plates, all from the same tree, made up from three pieces, one cut in half and spliced to the other long two sticks.
http://www.youtube.com/watch?v=R0Rpyd_XScYBrad, you are probably familiar with the type of gears I used, they came out of the front pumpkin on a 4x4 Ford F-250, the spider gears. We also used some out of a Toyota Tercel that worked good too, you get two sets. I spun the ring and pinion off plowing snow years back, I was amazed how little machining was needed to make them work.
Tim
