I am in the process of making a 32" Drum sander attachement for my SB. My question is How much weight can the Z axis hold without any undo wear on the bearings and motor. Im wanting to machine a Drum that fits in the router bracket so i can raise and lower the sanding drum but im concerned once I do that and the weight of the motor to drive the drum and the drum itself I might be pushing the limit of the stepper and bearings. Im prob at 25 pounds now without the mounting bracket. If I get to this to work I'll post some pics and the plans here. If I cant do it this way Ill make a screw drive to raise and lower the main drum and just mount the assembly to the Y Axis instead and Just plug in a new conector to my A or Z.