Thanks so much for the tips, Rob. I have a few questions.
1) What grit did you start with on the drum sander? With unplaned, rough lumber, I start with 80 grit, but I usually try to plane stock first and get it down to 1/16" of final thickness for glue-up. Then after panel glue ups (my most common use of the sander), I do passes on each side with 80 until I am within 0.010-0.012 inch of target thickenss
2) Did you use any other grits on the drum sander before switching to the ROS? I change to 120 grit for final sanding, sometimes I go to 180, taking only a few thousandsth each pass. Then I finish sand with my ROS at 180/220.
3) How long did it take to surface both sides of the Bubinga countertop on the drum sander? Because it was rough to start, we took about 12-15 passes with 2 grits at once as this was on a dual drum sander (80 and 120). It was 22+ inches wide, so we only took 5-10 thousandths off with each pass. It was 121" long.
Thanks for your help.
Amy