For the past few years I have had an old 2 drum Kuster sander in my shop. For my work the second (rear drum) is not used. It is just too much trouble to wrap both drums and get their relative heights set correctly. With the second drum not being used a shorter drive belt was installed that only drives the front drum. This results in the belt contacting 180 degrees of both the motor pulley and the drum pulley. This increased contact area has cured all tendency of the belt to slip when making heavy cuts.
I have no complaints with the way the old sucker sands but I wish the boards came out of the machine clean instead of covered with a layer of packed down saw dust. It takes longer to clean the boards between passes than it takes to sand them. Each time I look at that unused drum just sitting there I wish it were a rotating brush that would clean the boards as they exit the machine. Anyone with a dual drum sander have similar thoughts or have devised some other way to make the boards exit dust free? Earl Creel