My boss had an Ash tree fall from a bad storm a few weeks ago and used a chainsaw to cut the branches up and gave me the slices, so I’m working on surfacing them with with a 1in surfacing bit. I’ noticing that there are burn marks in the wood. That’s not an issue for the wood because I’m going to do a final pass, but are the burn marks from too fast of a speed rate or too slow? Spindle speed is set at 18000 per CC and I’m trying to adjust the feedrate with each section to see if I can find a good speed. Any advice would be appreciated.