Last Friday I purchased a 25" dual drum sander and was wondering you could share with me how you use yours and what grit of paper you keep in stock. I got the machine wired up and running last night and was running some test pieces of rough pine through it, I had a 80 grit on the front and 120 on the back. After several passes I still had small lines running the length of the wood so I removed the paper from the front drum and did a few passes of 120, there were still lines running the length. Is this normal? what grit would someone use for finishing. I need to stain these pieces when finished? Also do you guys keep a roll of every grit on hand or just three or four grits? Would it be normal to go from 80 to 220 or should I make slower progressions? What about using different grits on the front and rear drums?
THANKS