Thats just it this is the first time I hacve been asked to route wood. I used a bit that the software calls 1/4" Bit long. I already did it and it did work but I had to run the feed rate really slow and it made a god awful noise as it went along. I suppose that all this is due to Birch being a harder material. I even tried running a bunch of shallow passes to get the feed rate up but it wasnt much of an increase.