Thank you for the recommendations. The damage to my drive roller is looks to be less than 1/16" deep. I was toying with the idea of turning it down on a metal lathe. I know that will effect belt speed. Should the idler and drive roller be at the same height in relation to the table or is the drive roller lower? I only have platten height adjustment.
Thanks again for your input.
Dave A, an easier solution would be to dress the drum while it is in the machine. There's a few advantages to this. 1). You eliminate potential damage to your bearings if you need to pull them off, which will save you money. 2). If the damage to your rubber drum is 1/16' or under, you should be able to dress it in the machine (make sure it is level to your conveyor belt). If your drum was 37" or greater, then I would recommend you level the drum to the steel bed plates and not the conveyor belt, only because you will have more wear on a rubber belt vs a steel bed plate. That way you're leveling your drum to a true machine surface. What you don't want to do is put any kind of taper in the rubber contact drum, otherwise your abrasive belts will crease and fold over if the taper is significant enough. 3). Dynamic balancing shouldn't be needed when dressing that amount from your drum. You haven't disturbed the plane of the shafts in relationship to the bearings and as far as the cutting speed of the drum after dressing it, i doubt you would even notice.
Now with all that said, Adam is correct about the rubber drum height in relationship to the high speed steel roll. IF your machine is equipped with pillow block style bearings on the rubber contact drum, all you need to do is place shims between the bearings and the surface the bearings are mounted to. The thickness of these shims will be determined by how much you remove from the rubber drum. Hopefully your machine is equipped with a thickness readout. If not, place a dial indicator underneath the rubber contact drum and measure how much one full revolution of the hand wheel for your bed height adjustment is.
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