I need to make 2- 24" wide flat belt pulleys or rollers, 1 driver the other an idler. I intend to make it out of flat bar welded to hubs on each end because of it carries dampish dirt and don't want the rollers to pack up. Very little weight but a very dirty environment. I could mill a crown on the flat bar before welding.
My questions are to crown the middle or not, if so then how much?