Great explanation on why pulleys need to be crowned, I understand at last.
Now can you tell me which wheels on a 2" x 72" Belt Grinder with 4 wheels, (2 on the platen, 1 for tracking, and 1 being the driven wheel),need to be crowned. There is much debate on this on the web. Some say all 4 wheels, some say just the tracking wheel, some say just the driven wheel and some say both the driven and tracking wheels need to be crowned.