I need some advice on the best way to route a "juice catching" channel in an end grain cutting board. I've never tried to route end grain before, so that is a consideration. On top of that, I want the channel to track the shape of the cutting board, which is rectangular with rounded corners. If you've ever seen an aerial view of the Indy speedway, that is what the cutting board looks like. What is the best way to route a channel that tracks the shape of the cutting board but prevents the router from drifting in the corners? I assume I should do this with several shallow passes, so repeatability is important.