re: Stockroom Supply Flatmaster Drum Sander

I think the reality is that it’s not perfectly flat, maybe at the edges. But since you’re using sandpaper and not taking off very much stock, it’s almost imperceptible. I’m guessing if you put 60 grit on and made 40 passes, you would notice a change. I’ve never noticed anything ‘un-square’ after using it, but it’s sanding, not joining or planing…

Also, out of habit, I tend to flip boards end-on-end for each pass which probably levels things out a bit more. Since it’s sanding, grain orientation isn’t an issue like it would be on a planer.